What Is Building Strengthening?

Building strengthening refers to all engineering applications carried out to ensure that existing structures behave more safely under earthquake, wind, and other lateral loads. The main objective is to improve the existing load-bearing system and make the structure safe, rather than demolishing and rebuilding it.

The Importance of Building Strengthening

• Ensures life and property safety
• Enables post-earthquake usability
• More economical compared to demolition and reconstruction
• Extends the economic life of the structure
• Minimizes operational downtime for businesses

For these reasons, building strengthening should be considered not only a technical necessity but also a strategic investment.

Which Structures Should Be Strengthened?

• Residential buildings constructed before 2000
• Industrial facilities and factories
• Energy structures (power plants, turbine foundations, etc.)
• Hospitals, schools, and public buildings
• All existing structures with insufficient seismic performance

Building Strengthening Methods

Different techniques are applied depending on the structure type and existing conditions:

• Carbon Fiber (FRP) Strengthening
• Reinforced concrete shear walls and jacketing
• Steel member additions
• Foundation and soil improvement solutions

The correct selection and design of these methods are only possible through expert engineering judgment.

The Role of Engineering and Proper Design

The most critical step in building strengthening projects is the accurate assessment of the building’s seismic performance. Incorrect or incomplete analyses may render strengthening applications ineffective. Therefore, the process should include:

• Detailed site inspections
• Performance analysis in compliance with current regulations
• Structure-specific engineering solutions

Safe Strengthening Solutions with İntaç İnşaat Mühendislik

Since 2004, İntaç İnşaat Mühendislik has been providing services with its specialized team in building strengthening, seismic performance analysis, and site-specific engineering solutions.

Project-based strengthening solutions developed for energy structures, industrial facilities, and existing buildings prioritize both occupational safety and structural durability. İntaç adopts a structure-specific engineering approach in every project, delivering sustainable and reliable results.

Conclusion

The path to earthquake-resistant structures lies in well-planned building strengthening projects. Strengthening works carried out with accurate analysis, appropriate methods, and an experienced engineering team secure both today and the future.

What Is FRP Wrapping?

FRP (Fiber Reinforced Polymer) wrapping is a strengthening technique based on wrapping reinforced concrete elements with carbon, glass, or aramid fiber fabrics bonded using epoxy-based resins.

This method is mainly applied to structural elements such as columns and beams in order to:

• Increase axial and shear capacity
• Improve ductility performance
• Enhance structural behavior under seismic loads

Thanks to its high strength-to-weight ratio, FRP systems provide effective strengthening without adding significant weight to the structure.

Advantages of FRP for Seismic Strengthening

FRP wrapping is widely preferred in seismic strengthening projects due to the following advantages:

• Minimal impact on architectural layout
• Faster application compared to traditional jacketing methods
• Can be applied while the building remains in use
• High resistance to corrosion
• Long service life with low maintenance requirements

For industrial facilities, commercial buildings, and continuously operating structures, FRP strengthening offers a safe solution while maintaining operational continuity.

Which Types of Structures Are Suitable for FRP Strengthening?

FRP wrapping systems can be effectively applied to various types of buildings, including:

• Residential buildings
• Industrial and factory structures
• Hospitals and healthcare facilities
• Schools and educational buildings
• Office and commercial buildings
• Existing buildings with insufficient seismic performance

However, FRP is not universally applicable to every structure. The suitability of the system must be determined through detailed structural assessment and engineering analysis.

The Importance of Engineering and Proper Design in FRP Wrapping

Although FRP wrapping may appear to be a straightforward application, it cannot deliver the expected performance without proper engineering design.

A successful FRP strengthening project requires:

• Detailed seismic performance assessment of the existing structure
• Determination of target performance levels in compliance with seismic codes
• Engineering-based selection of fiber type, wrapping direction, and number of layers
• Strict quality control before, during, and after application

Therefore, FRP strengthening is not merely an application process but a comprehensive engineering service covering analysis, design, and site supervision.

FRP Strengthening with İntaç İnşaat Mühendislik

İntaç İnşaat Mühendislik delivers FRP wrapping and structural strengthening projects with a strong focus on engineering discipline and technical accuracy.

The company provides integrated services including seismic performance analysis, FRP-based strengthening design, code-compliant calculations and reporting, and on-site technical supervision. Each project is approached with structure-specific solutions rather than standard applications, ensuring safe, efficient, and economically optimized results.

Today, steel is one of the most widely used materials in the construction industry due to its durability and flexibility. However, simply using high-quality steel is not enough to ensure that a structure is safe and long-lasting; a solid structural (static) design is also essential. So, what exactly are steel static designs, and why are they so important?

What Is a Structural (Static) Design?

Let’s start by explaining what a “static design” is. A static design is a set of calculations and drawings that ensure a building can safely transfer all loads (such as people, furniture, wind, snow, earthquakes, and other natural effects) down to the ground. Through a static design, the sizes and placements of all structural elements (columns, beams, slabs, roofs, etc.) are determined.

What Makes Steel Static Designs Different?

Static design becomes even more critical in steel structures. Since steel is lighter and has a higher load-bearing capacity compared to materials like reinforced concrete, every detail—such as connections, welds, and bolts—must be designed meticulously. Even the smallest mistake at these points can compromise the safety of the entire structure.

Why Is It Important?

1. Safety
   The primary reason is, of course, human safety. A well-designed steel static project ensures the structure is durable and safe. Especially during natural disasters like earthquakes, a properly designed steel structure can save many lives.
2. Cost-Effective and Efficient Use
   Structural designs help prevent unnecessary use of materials, leading to both economic and eco-friendly solutions. Using too much steel increases costs, while insufficient use threatens safety. Accurate calculations ensure optimum material usage.
3. Legal Requirements and Compliance with Standards
   In Turkey and around the world, preparing static designs and ensuring their compliance with regulations is mandatory for all construction projects. Without approved or complete designs, it’s impossible to obtain permits, and this can lead to serious legal problems in the future.
4. Long Lifespan and Easy Maintenance
   A well-prepared steel static design ensures the structure requires less maintenance and remains durable for many years. If the details are correctly determined at the beginning, future issues are minimized.
5. Engineering and Design Quality
   The static design reflects the quality of engineering. With a good project, both aesthetic and functional structures are created. It also helps prevent possible errors and clashes in the project.

In Summary…

Steel static designs are indispensable for the fundamental safety, durability, and cost-effectiveness of a building. For engineers, it’s not just a document—it’s the backbone of the structure. Remember: “structural calculations = safe buildings.”

1. Provides Structural Safety

Thanks to the static project, the dimensions, placements and resistance capacities of the load-bearing elements such as columns, beams, floors and foundations in the structure are determined. This ensures that the building carries its weight and external factors safely.

2. Resistance to Earthquakes and External Loads

In countries located in earthquake zones such as Turkey, the seismic resistance of structures is of great importance. Static projects are calculated in accordance with the Earthquake Regulation and ensure that the structure survives disasters such as earthquakes.

3. Material and Cost Efficiency

A well-prepared reinforced concrete project ensures that the material is used correctly and in sufficient quantities. This both prevents waste of resources and optimizes construction costs.

4. Legal Obligation and License Process

In order to obtain a building permit from the municipalities, it is mandatory to submit an approved reinforced concrete static project. Buildings built without a project or with inappropriate projects are considered illegal and may face serious sanctions.

5. Ease of Application

Engineers and craftsmen working on the construction site construct the carrier system elements correctly by looking at the drawings and details of the reinforced concrete project. This reduces errors and speeds up the application process.

🔧 Structural Safety

A static project guarantees that the building can withstand all loads (e.g. its own weight, snow, wind, earthquake, usage loads, etc.). An incorrect static calculation can collapse or cause serious damage. Even in a high-strength material such as steel, if the appropriate programming is not done, the carrier system may be inadequate.

💰 Economical and Efficient Material Use

A well-equipped static project ensures that the steel profiles are sized correctly. If larger sections are selected than necessary, the cost increases; If small sections are selected, the structure is at risk. In this way, a solution that is both safe and optimized in terms of cost is required.

🏗️ Determines the Manufacturing and Assembly Process

Steel structures are manufactured in the factory and assembled on site. The static project is instantly determined thanks to the profile length, section, hole locations, and connection plates. In this way, time and cost savings are achieved during production and assembly.

📜 Legal Obligation and License Process

In Türkiye and many countries, in order for a record to be licensed, it must be prepared in accordance with the regulations regarding static records (for example, TBDY in Türkiye – Turkish Building Earthquake Regulation). Otherwise, it cannot obtain a building permit.

🌍 Earthquake Resistance

Static projects in earthquake zones such as Turkey are designed especially by taking into account earthquake forces. Approval of steel structures is a great advantage, but this flexibility can lead to non-structural deformations if not projected correctly. The static project determines how to act against earthquakes and takes the necessary precautions.

🧩 Interdisciplinary Harmony

Static project, to work in harmony with architectural, electrical and mechanical projects. For example; the place where a column passes should not conflict with a mechanical installation line. Static project resolves such conflicts at the beginning and ensures that other disciplines work properly.

As İntac Engineering, we have carried out many large and important steel static projects.

Basic Approaches Used in Acoustic CFD Analysis

Direct Simulation (DS)

• Both fluid motion and acoustic waves are calculated using the full Navier-Stokes equations.
• It gives extremely accurate results, but is usually used in small-scale problems due to its high computational cost.

Discrete Flow and Acoustic Approach (Hybrid CFD/CAA – Computational Aeroacoustics)

• First, flow analysis is performed with CFD and the obtained flow data is used for acoustic simulation.
• Lighthill’s Acoustic Wave Equation, Ffowcs Williams-Hawkings (FW-H) equation and similar models are used to calculate the propagation of sound.
• It is preferred in large-scale and complex geometry systems.

Linearized Euler Equations (LEE)

• The propagation of sound is calculated by considering fluid motion.
• It is used to understand the propagation of sound waves, not the source of noise.

Where is Acoustic CFD Analysis Used?

Automotive Sector

• Optimization of engine, exhaust systems and in-car sound insulation
• Turbulence-induced noise analyses
• Optimization studies on the silence of electric vehicles

Aviation and Space

• Noise analyses of jet engines
• Acoustic effects caused by wing turbulence
• Sound propagation inside the aircraft cabin

Building Acoustics

• Noise analysis of ventilation systems
• Indoor acoustics and reverberation time optimization
• Sound insulation and noise control

Electronic Devices

• Analysis of noise levels of fan cooling systems
• Speaker and microphone design

Software Used in Acoustic CFD Analysis

• ANSYS Fluent – ​​Frequently used for fluid dynamics and acoustic analysis.
• COMSOL Multiphysics – A powerful tool that combines acoustic and flow analyses.
• OpenFOAM – Open source and includes customizable acoustic models.
• SIEMENS Simcenter STAR-CCM+ – Performs flow and sound analysis in an integrated manner.

How is Acoustic CFD Analysis Performed? (Step by Step)

Geometry and Mesh Creation

• 3D modeling of the area to be analyzed is created.
• A mesh structure with appropriate resolution is determined for CFD.

Determination of Boundary Conditions

• Sound source, flow velocity, turbulence models and wall conditions are defined.

Fluid Dynamics Simulation (CFD Run)

• Turbulence and pressure changes of the flow are examined.
• Data obtained from CFD calculations are prepared for acoustic analysis.

Acoustic Analysis

• Sound propagation is calculated by solving acoustic equations.
• Noise levels and sound wavelengths are analyzed.
• Evaluation and Optimization of Results

Obtained data is interpreted and design changes are suggested to reduce noise.

Conclusion

Acoustic CFD analysis is a powerful tool for noise control and sound optimization in the field of engineering. Thanks to advanced simulation techniques, it is possible to determine sound sources, analyze their propagation and reduce noise. It plays a critical role especially in the fields of automotive, aviation and building acoustics.

As İntaç Engineering, we have successfully completed many CFD Analysis projects.

Benefits of CFD Fire Analysis

Understanding Fire Spread Dynamics: CFD simulations help reduce fire risks in buildings by predicting in which direction and how fast the fire will spread.

Modeling Smoke and Toxic Gas Movements: Evaluating the movement of smoke and gases formed during a fire within the building to develop evacuation plans.

Evaluating the Efficiency of Fire Suppression Systems: The effectiveness of fire control mechanisms such as sprinkler systems, fire curtains, and ventilation systems is tested.

Cost and Time Savings: Analyzing fire scenarios in a digital environment instead of physical tests reduces costs and saves time.

Software Used in CFD Fire Analysis

The main software used in CFD-based fire analysis are as follows:

FDS (Fire Dynamics Simulator): Developed by the US National Institute of Standards and Technology (NIST), this software is widely used in fire and smoke spread simulations.

ANSYS Fluent: It is preferred for fire analyses in industrial facilities and large structures.

PyroSim: It is the graphical interface of FDS and makes fire simulations more useful.

Stages of Fire CFD Simulation

Geometric Modeling: A 3D model of the building or facility is created.

Mesh Creation: The simulation area is divided into small regions (cells) in order to make calculations.

Determining Boundary Conditions: Parameters such as fire starting point, burning speed and smoke movements are determined.

Simulation Run: The fire spread dynamics are examined with computer-aided calculations.

Evaluating the Results: The effects of the fire inside the building are analyzed and the necessary precautions are determined.

Conclusion

CFD fire analysis is a critical technology that increases the level of safety in building design and minimizes loss of life and property. Safer structures can be built by predicting the effects of fire with the help of developing simulation software. The use of CFD analysis in the field of fire safety will become more widespread in the future.

As İntac Engineering, we have completed many successful CFD analysis projects.

Static projects are projects that include technical designs and calculations prepared to ensure that buildings, bridges, dams and other engineering structures are constructed in a safe, solid and durable manner. An important part of the civil engineering discipline, a static project determines how the structure’s carrier system will be constructed and includes calculations to ensure structural safety.

Static Project Stages

A static project is usually created through the following stages:

1. Preliminary Project and Analysis

In the first stage, structural analyses are performed in accordance with the architectural project. At this stage, the general structure of the carrier system is determined and initial static calculations are performed. The design process begins by considering the purpose of use of the structure, ground conditions and environmental factors.

2. Ground Survey and Load Analysis

Ground survey is important for the safe design of the foundation of the structure. The foundation type and load distribution of the carrier system are determined according to the ground properties. In addition, the loads that will affect the structure (dead load, live load, wind load, earthquake load, etc.) are calculated.

3. Carrier System Design

In this stage, the design of columns, beams, slabs, foundation system and other carrier elements is made. The most suitable carrier system is determined using different materials such as reinforced concrete, steel or wood.

4. Calculations and Structural Analysis

Various structural analyses are performed within the scope of the static project. Using engineering software such as SAP2000, ETABS, STAAD.Pro, the forces affecting the structure are calculated and the durability of the carrier system is tested. In addition, compliance with regulations such as TS 500, Eurocode or ACI is ensured.

5. Project Drawings and Reporting

In the final stage, project drawings are prepared in line with the static calculations. Section details, reinforcement placements and dimensions of the structural elements are drawn in detail. In addition, an engineering report is prepared and the calculations and assumptions of the project are documented.

Why is a Static Project Important?

Static projects are of great importance for the long-lasting and safe service of the structure. Incorrect static calculations can lead to the collapse of the structure or major damage. Therefore, it is vital to make correct engineering calculations during the project design phase.

In addition, static projects must comply with legal regulations. Many structures located in earthquake zones in Turkey must be designed in accordance with the Earthquake Regulation. In order to build safe and sustainable structures, static projects must be prepared meticulously.

Conclusion

Static projects are a critical process that determines the load-bearing systems of structures and ensures their safety with engineering calculations. These projects, which include many stages from ground survey to structural analysis, are indispensable for the safety of structures. A detailed static project prepared by professional engineers guarantees both safety and structural durability.

Material selection, cross-sectional shape and dimensions of silos directly affect structural durability. For example, concrete and steel silos offer different advantages in different projects and both materials are ideal for long-lasting projects. By using advanced construction techniques in design, the construction process can be accelerated, and the strength of the structure can be increased.

Silos can be in various shapes such as square, rectangular, cylindrical, hexagonal and octagonal. Each geometric shape has its own advantages and disadvantages. These are decisions that can be evaluated according to the results of the analyses in the design.

In the next stages, factors such as storage capacity, discharge systems and material flow rates should be considered. Therefore, conical bottoms and internal structures in the silo optimize the material flow and balance the load distribution. In silo design, static, dynamic and earthquake loads must be calculated. In addition, lateral forces, moment effects and capacity ratios have a significant effect on the structural strength of the silo.

Material flow is also a critical element in silo design. Flow patterns such as mass flow and funnel flow regulate the movement of the material in the silo. Therefore, it is important to select the most appropriate flow pattern in silo design according to the requirements of the project.

Advanced techniques used in silo construction include slipform and jumpform methods:

1. Slipform Method: It creates a continuous structure with continuous pouring of concrete and is ideal for large-scale projects. This method requires 24/7 uninterrupted work and accelerates construction processes. Thanks to the slipform method, a monolithic structure is obtained, and the strength of the structure is increased.
2. Jumpform Method: It is based on the process of pouring concrete layer by layer and a certain time is allocated for each layer to dry. This method increases the integrity of the structure and ensures quality control. The jumpform method allows for detailed inspection and is particularly used in projects requiring high strength.

Silo design and construction is a process that requires expertise in engineering and structural design. Proper material selection, appropriate construction techniques and detailed structural analyses are the cornerstones of a successful silo project. Silos designed in compliance with occupational safety and environmental regulations provide long-lasting and reliable storage solutions. By considering these technical details and engineering approaches, reliable silos can be built for industrial and agricultural storage needs.

In addition, international and local standards should be taken into consideration in silo design. Standards such as ACI 313-16, ASCE 7 and Eurocode 1 are an important part of the design process to ensure the structural strength and safety of silos in structural statics and analyses.

These elements, which must be considered in silo design, are the basis for creating a successful and reliable storage solution. These technical details and advanced engineering approaches should be considered to build reliable silos for industrial and agricultural storage needs. In this way, silo storage processes can be made more efficient and safe, and long-lasting structures can be created.

In performance-based design, linear elastic calculation methods based on strength and nonlinear inelastic calculation methods based on strain and displacement are used to determine the earthquake performance of existing and retrofitted buildings.

Linear calculation methods are not sufficient because they cannot accurately model the deformations in the structure and the plasticity of the joints. Therefore, linear analyses are usually required to perform nonlinear analyses for the detailing of the retrofit design and making final decisions. However, nonlinear analyses should be used for detailing the retrofit design and making final decisions.

In the Equivalent Earthquake Method, the element stiffnesses and section properties of the structure are determined and the internal forces and displacements are calculated by linear distribution of horizontal earthquake loads and the behaviour of the structure under these loads by applying stiffness.

Nonlinear calculation methods are used to analyse the plasticity and deformation capacities of structures when they exceed elastic limits. These methods are critical for predicting the actual behaviour of structures more accurately. Nonlinear analyses help to determine the damage potential, energy absorption capacity and performance levels of structural elements.

Nonlinear calculation methods are critical for accurately assessing the earthquake performance of structures and planning retrofitting strategies. Methods such as pushover analysis and time-history analysis help to determine retrofitting requirements by examining the elastic and plastic behaviour of structures in detail.

• In the Equivalent Earthquake Method, element stiffnesses and section properties of the structure are determined and internal forces and displacements are calculated by linear distribution of horizontal earthquake loads and the behaviour of the structural elements under these loads using the stiffness matrix.
• Pushover analysis is a widely used nonlinear static analysis method to evaluate the performance of structures under earthquake effects.

In design by deformation applied in earthquake performance analysis, the capacity curve of the structural element shows the elastic and plastic behaviour of the structure and displacement is generated by horizontal load. Thus, it enables the determination of different performance levels such as immediate use, life safety, pre-collapse. As a result, it shows the damage status of the structural elements.

• Modal Combining method is a method that examines the dynamic behaviour of the structure by considering the earthquake response spectrum, natural vibration modes and frequencies according to the data obtained from the structure. Accordingly, modal analysis is performed and the whole response of the structural elements is calculated by using SRSS, CQC methods.
• Time-History Analysis is a nonlinear calculation method that examines the time-dependent behaviour of structures under the data according to real earthquake records as specified by the regulation and should be used for the evaluation of structural performance. is the most detailed analysis method.  Deformations, plastic joint formations and energy absorption capacities of the structure at different time points are analysed. The earthquake records to be used in earthquake performance analyses are selected in accordance with the seismic hazard assessments specific to the region where the structure is located. Accordingly, the moment and shear forces generated in the existing structural elements provide a detailed evaluation of the structural performance.