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Modal Non-linear Static Analysis of Structures Based on Story Shears | ||
| AUT Journal of Civil Engineering | ||
| مقاله 11، دوره 3، شماره 1، شهریور 2019، صفحه 119-128 اصل مقاله (504.3 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajce.2018.14614.5488 | ||
| نویسندگان | ||
| F. Behnamfar* ؛ A. Naseri-Dehkordi | ||
| Department of Civil Engineering, Isfahan University of Technology, Esfahan, Iran | ||
| چکیده | ||
| In this paper a modal pushover procedure is presented in which distribution of lateral forces is calculated using the story shears. The shear force of each story is determined using its relative interstory displacement and stiffness in each mode of vibration utilizing spectral analysis relations. To retain simplicity of the procedure, like the common pushover procedures, the initial elastic dynamic characteristics of buildings are used for spectral analysis throughout. A combination rule for modal story shears is proposed that keeps the signs of responses. Therefore, the computed lateral loads contain effects of the desired number of modes and the nonlinear static analysis is performed in a single stage accounting for effects of higher modes. The lateral displacements, story shears and cumulative plastic hinge rotations are compared with the results of the conventional and modal pushover analysis and with the result of the exact nonlinear dynamic analysis. The comparative study establishes good accuracy of the proposed method as an alternative modal pushover procedure. | ||
| کلیدواژه‌ها | ||
| Pushover؛ Shear Based؛ Modal؛ Conventional؛ Time History؛ Nonlinear | ||
| مراجع | ||
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[1] ASCE/SEI Seismic Rehabilitation Standards Committee, Seismic rehabilitation of existing buildings (ASCE/SEI 41-13), American Society of Civil Engineers, Reston, VA, 2013. [2] Building Seismic Safety Council, Prestandard and Commentary for the Seismic Rehabilitation of Buildings, Report FEMA-356, Washington, DC. 2000. [3] A.K. Chopra, R.K. Goel, A modal pushover analysis procedure for estimating seismic demands for buildings, Earthquake Engineering & Structural Dynamics, 31(3) (2002) 561-582. [4] S. Antoniou, R. Pinho, ADVANTAGES AND LIMITATIONS OF ADAPTIVE AND NON-ADAPTIVE FORCE-BASED PUSHOVER PROCEDURES, Journal of Earthquake Engineering, 8(4) (2004) 497-522. [5] S. Antoniou, R. Pinho, DEVELOPMENT AND VERIFICATION OF A DISPLACEMENT-BASED ADAPTIVE PUSHOVER PROCEDURE, Journal of Earthquake Engineering, 8(5) (2004) 643-661. [6] M. Poursha, F. Khoshnoudian, A.S. Moghadam, A consecutive modal pushover procedure for nonlinear static analysis of one-way unsymmetric-plan tall building structures, Engineering Structures, 33(9) (2011) 2417-2434. [7] A. Sahraei, F. Behnamfar, A Drift Pushover Analysis Procedure for Estimating the Seismic Demands of Buildings, Earthquake Spectra, 30(4) (2013) 1601-1618. [8] K. Shakeri, M.A. Shayanfar, T. Kabeyasawa, A story shear-based adaptive pushover procedure for estimating seismic demands of buildings, Engineering Structures, 32(1) (2010) 174-183. [9] AISC, Manual of steel construction–allowable stress design, American Institute of Steel Construction (AISC), Chicago, (1989). [10] Open System for Earthquake Engineering Simulation (OpenSees), Pacific Earthquake Engineering Research Center (PEER). Richmond, CA: OpenSees. Available at: http://opensees.berkeley.edu (accessed September 2015). [11] Pacific Earthquake Engineering Research Center, PEER strong motion database, University of California, Berkeley Berkeley, CA, Disponivel online em: peer. berkeley.edu/products/strong_ground_motion_db.html. 2000. [12] ASCE7-10, Minimum Design Loads for Buildings and other Structures: American Society of Civil Engineering, (2010). [13] A. Naseri Dehkordi, F. Behnamfar, Development of a shear-based nonlinear static procedure for seismic evaluation of structures, Islamic Azad University, Esfahan, Science and Research Branch, (2014). | ||
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