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The dynamic behavior of buildings can change during construction stages. The brick walls cause a considerable effect on the modal behavior depending on the wall configuration. In this paper, it is aimed to present the effects of construction stages (bare frame, brick-walled and coated cases) on the modal parameters of reinforced concrete (RC) build...
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Obtaining a good experimental modal data is essential in modal analysis in order to ensure accurate extraction of modal parameters. The parameters are compared with other extraction methods to ascertain its consistency and validity. This paper demonstrates the extraction of modal parameters using various identification algorithms in Operational Mod...
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... Since the analytical models that are made do not fully reflect the actual behavior of the building, real dynamic characteristics cannot be obtained due to the support conditions, the mass of structures and etc. To obtain more accurate results in analytical studies, researchers have made both experiments performed on full-scale constructions in the field and in experimental studies on scaled constructions in the laboratory conditions [2][3][4][5][6][7][8][9]. For this reason, experimental methods are needed to create a finite element model that will represent actual behavior. ...
... The building was tested through Operational Modal Analysis (OMA). In the work experimental research, dynamic characteristics of a three storey reinforced concrete structure with a 1/2 scale during different contruction stages were determined [23]. Enhanced Frequency Domain Decomposition (EFDD) technique was used to obtain frequencies and mode shapes. ...
... The purpose of the analytical studies is to validate the operational modal analysis carried out in Türker and Bayraktar [23]. Analytical studies were conducted through the linear models using the finite element method which uses the ABAQUS software [27], in order to evaluate the suitability of the dynamic behavior of the building. ...
The effects of seismic actions on reinforced concrete (RC) structures are strongly influenced by the dynamic behavior of their materials. It is crucial to find a simple definition of the natural frequencies of reinforced concrete buildings, particularly in relation to both principal and secondary elements constructing the reinforced concrete building type. This paper firstly presents a comparison with the ambient vibration surveys. An analysis model of different stages of construction of the reinforced concrete masonry wall was compared using the finite element software. In the second step, structural responses of the model were investigated by means of static analysis. Three main types were examined: Bare frame for one, two and three storeys; brick-walled; and coated cases. Modal analysis is carried out by ABAQUS software starting from the deformed building, to provide the natural frequencies and mode shapes. For the natural frequencies, a good agreement is obtained between analytical and experimental results. Furthermore, the comparison results between different cases show that the application of the plaster work increases the lateral stiffness and has significant effects on the dynamic response of the buildings.
Modern infrastructure management against failure due to unaccounted forces like earthquake forces is a great need in the society due to high cost, and structural strengthening can help them to last longer and be more resilient to earthquake. In general, structures are severely affected by earthquake loads. Strengthening by jacketing technique can be effective in protecting reinforced concrete structures while simultaneously prolonging their life. Literature survey reveals that a good number of studies have been performed in the past, but effective strengthening methodology for RCC buildings by jacketing against failure due to earthquake is not available in Indian perspective. The purpose of this study is to compare on jacketing procedures such as concrete jacketing, steel jacketing, and carbon fiber-reinforced polymer (CFRP) jacketing, combinations of different jacketing methods through numerical investigation using Finite Element Analysis (FEA) software, i.e., ABAQUS due to real-type earthquake ground motion. It was discovered that concrete jacketing is a viable alternative for use in low-rise buildings, as it decreases 11.83% of deflection globally. The optimal combination of concrete jacketing at ground floor columns and CFRP at joints reduces global deflection by 28.69% when compared to the reference structures. It was observed that concrete jacketing is the most cost-effective option for low-rise buildings, accounting for only 6.55% of the overall building cost when only material costs are considered. The cost of combining concrete and CFRP is also lower, accounting for only 19.83% of the total cost.KeywordsStrengtheningConcrete jacketingSteel jacketingFRP jacketingFEAEarthquakeRCC building
Nowadays, different structural members can be used in structures. The mechanical properties of the materials are variable. For this reason, it is very important to identify the material properties correctly. The main parameter used to define the material properties is the elasticity modulus. In this study, the elasticity modulus of structural members was determined by Model Calibration Method using dynamic characteristics obtained from Ambient Vibration Test data. The application of the proposed method was presented on a steel structure member. First of all, experimental natural frequencies were obtained by conducting Environmental Vibration Test on the selected model. A measurement system consisting of accelerometers for experimental measurements and an electronic circuit used as signal collection unit are designed. The data obtained from this measurement system were transferred to the computer environment and analyzed in the Matlab program. Using the SAP2000 package program, the theoretical natural frequencies were found by Finite Element Method. The difference between the experimental and theoretical results was reduced to the lowest as a result of repeated analysis by modifying the elasticity modulus in the Finite Element model created in SAP2000 program via software generated in Matlab. The calibrated finite element model and the elasticity modulus of the steel structural member are determined by the process.
