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Earthquake resistant structures

About: Earthquake resistant structures is a research topic. Over the lifetime, 1126 publications have been published within this topic receiving 27467 citations.


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Journal ArticleDOI
TL;DR: In this article, a comparison of two 4-storey reinforced concrete buildings designed as high ductility classes (DCH) and medium ductility class (DCM) upon a strong rock (ground type A, Eurocode 8 soil classification) according to the Eurocode8.
Abstract: Provision of ductility in the structures according to the modern design codes lead to more economic constructions, while safety levels reach higher rates. The philosophy is based into allowing some damage to occur in predetermined elements where enough ductility has been provided in order to ensure the member’s capacity during an earthquake. This research focuses on investigating optimum ductility provisions for buildings to achieve the desired performance. The aim is to assess the parameters which affect ductility demands and overall present a comprehensive methodology for evaluating the structural performance. Analytical work was based on the comparison of two 4-storey reinforced concrete buildings designed as high ductility class (DCH) and medium ductility class (DCM) upon a strong rock (Ground type A, Eurocode 8 soil classification)according to the Eurocode 8. For a fair comparison both buildings were designed to have same vibration frequencies in order to experience same energy release rates under a number of earthquakes with varied ground acceleration amplitudes and frequency spectrums. The main criteria for the comparison were: (i) the inter-storey drifts, (ii) the energy distribution among the floors, (iii) the structural damage in terms of plastic hinges initiation and ductility demand rates, (iv) total energy dissipation and (v) top floor displacements. The damage rates in the structures were found to be directly correlated to the earthquake’s frequency range. Low frequency seismic events corresponding to high periods in the elastic response spectrum used for the design of the structures were more catastrophic. The paper proved that DCH buildings perform generally better than DCM for high ground acceleration amplitudes, while for smaller GAA where the responses are governed by the stiffness in the elastic response range the DCM structures have functional superiority. Higher ductility provisions have been found beneficial for the structural performance, especially for higher ductility demands caused by higher intensity earthquakes with increased return periods and ground acceleration amplitudes.

2 citations

Journal ArticleDOI
TL;DR: The results show that the model can be fully integrated with those market’s programs which support Microsoft Excel and can be useful to select the optimum selection of the material while Phase 2 and 3 contribute to design of the earthquake resistant structure.
Abstract: Selection of the material and design of earthquake resistance structures are an important issue today. Many people die every year due to inappropriate design and selection of the materials. There are several software to be used for structural design of buildings, however they just design the structure based on some limited standards. There is a need to develop a computer-based earthquake resistant design model to integrate the current market’s software with different design standards of different countries. The objective of this study is to propose a model to integrate the local structural design standards/codes with available market’s programs. To achieve this objective, Microsoft Excel was used as the core of the model to be integrated with one of the market’s program. Then, the model was developed in three phases. To test the model, the Iranian design standard (Code 2800) was used to design a 7-story apartment. The results show that the model can be fully integrated with those market’s programs which support Microsoft Excel. The result of Phase 1 of the model is useful to select the optimum selection of the material while Phase 2 and 3 contribute to design of the earthquake resistant structure.

2 citations

01 Jan 2001
TL;DR: In this paper, the effects of modeling boundary conditions and considering the initial micro-cracking of reinforced concrete on natural frequency change were investigated using the finite element method, and the parameters were then used to calibrate finite element models to experimental models.
Abstract: This study performed seismic analyses of reinforced concrete structures using the finite element method. Two shake table tests were simulated: a test of a lightly reinforced concrete three story frame building, and a test of a seismically designed shear wall. An investigation was performed on the effects of modeling boundary conditions and of considering the initial micro-cracking of concrete on natural frequency change. The parameters are then used to calibrate finite element models to experimental models. The paper provides information on the results of the analyses of both structures.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a two-level displacement-based design procedure is developed to obtain the displacement demands, elastic spectra for occasional earthquakes and inelastic spectras for rare earthquakes are used.
Abstract: A two-level displacement-based design procedure is developed. To obtain the displacement demands, elastic spectra for occasional earthquakes and inelastic spectra for rare earthquakes are used. Minimum global stiffness and strength to be supplied to the structure are based on specified maximum permissible drift limits and on the condition that the structure responds within the elastic range for occasional earthquakes. The performance of the structure may be assessed by an inelastic push-over analysis to the required displacement and the evaluation of damage indices. The approach is applied to the design of a five-story reinforced concrete coupled wall structure located in the most hazardous seismic region of Argentina. The inelastic dynamic response of the structure subjected to real and artificially generated acceleration time histories is also analyzed. Finally, advantages and limitations of the proposed procedure from the conceptual point of view and practical application are discussed.

2 citations

Proceedings ArticleDOI
29 Apr 2009
TL;DR: In this paper, the authors compared the accuracy of capacity spectrum method introduced by ATC-40 with modified capacity spectrum methods of FEMA-440 for evaluating the seismic performance of buckling Restrained Braced Frame (BRBF).
Abstract: In the performance-based design, determination of performance and evaluating the structure and its components requires to assess the seismic capacity and demand. In order to achieve these goals, analytical methods with high capabilities of modeling the structure and seismic excitations are required. Linear and non-linear approaches were introduced as analytical methods for rehabilitation pre-standard, where both of them can be done statically or dynamically. Among nonlinear methods, usage of nonlinear static analysis (Pushover analysis) for evaluating the structures is proliferated. This analysis aimed on evaluating the expected performance of structural system and estimating the resistance and deformation demands of it in design earthquake. These demands are compared to the existed capacities of target performance levels. In order to calculate the target displacement or performance point, different methods such as Capacity Spectrum Method (CSM) in ATC-40 [1] and Coefficient Method in FEMA-356 [2] were introduced. However, based on previous researches, the observed results of applying these methods for identical structures were dissimilar. Therefore, FEMA-440[3] proposed two enhanced methods to modify these methods and convergence of their outcomes. The aim of this study is to investigate and compare the accuracy of capacity spectrum method introduced by ATC-40 with modified capacity spectrum method of FEMA-440 for evaluating the seismic performance of Buckling Restrained Braced Frame (BRBF).

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
20223
202113
20209
201916
201813