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| COLLAPSE SIMULATION AND ANALYSIS OF CYPRESS VIADUCT DURING LOMA PRIETA EARTHQUAKE |
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Abstract The collapse of the Cypress Viaduct is employed to test the following structural collapse analysis model：a mixed hinge model based on generalized functions is proposed to describe discontinuous displacements；the governing equations are built in the current unstressed configuration；a Lagrange multiplier approach is adopted for the analysis of collisions. After both the viaduct parameters and the ground acceleration recorded at Emeryville are input to the corresponding program，the changing coordinates of each member end during the collapse process are obtained. Visualized clearly by the Visualization of Dynamic Demo Show，the collapse process is consistent with the speculation of the Earthquake Engineering Research Center from UC Berkeley，which proves the validity and utility of the present models. Based on the results，some issues，such as the reason of the collapse，sharp changes of the frame accelerations when collisions happen，and the effects of earthquake lasting times on the weak parts of the structures，are discussed.
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Received: 01 February 2005
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Corresponding Authors:
ZHOU Yan
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MEI Xiancheng1, 2, CUI Zhen1, 2*, SHENG Qian1, 2, CHEN Jian1, 2, FEI Yang1, 2, TANG Langzhou1, 2, ZHAO Xu3, LI Ruohan4, HUANG Jingqi5. Physical modeling on the coupling effect of strong shaking-fault movement to a fault-crossing tunnel (I): Experimental system and method[J]. , 2026, 45(5): 1304-1320. |
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