Dynamic reliability evaluation of double-layer cylindrical latticed shell under multi-support excitations |
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| Authors: | LIU Chunguang LI Huijun |
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| Institution: | LIU Chunguang1,2,LI Huijun2(1.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China,2.Faculty of Infrastructure Engineering,China) |
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| Abstract: | To overcome the excessive computational cost and/or bad accuracy of traditional approaches, the probabilistic density evolution
method (PDEM) is introduced. The dynamic reliability of a double-layer cylindrical latticed shell is evaluated by applying
PDEM and Monte Carlo Method (MCM) respectively, and four apparent wave velocities (100 m/s, 500 m/s, 800 m/s and 1 200 m/s)
and five thresholds (0.1 m, 0.2 m, 0.3 m, 0.4 m and 0.5 m) are taken into consideration. Only the difference between threshold
and maximal deformation is taken as the performance function. The numerical results show that results obtained by PDEM and
MCM agree well; the dynamic reliability increases markedly with the increase of displacement threshold; the types of probabilistic
density curves of response are different from that of regular distribution; the dynamic reliability will decrease with the
decrease of apparent wave velocity, and more members will enter into the plastic state when subjected to multi-support excitations
compared with uniform excitation. Thus, it is necessary to take the wave passage effect into consideration in the seismic
design of shell structures. |
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| Keywords: | shell structure reliability Monte Carlo method probability density evolution method finite difference method efficiency |
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