Study on failure mode of hydropower house superstructure under rare earthquake action

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (3) : 55-61.

HAO Jungang1, HU Lei2, WU Hegao1, FU Dan1

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Abstract

To reveal failure mode and seismic safety margin of hydropower house under rare earthquake action, concrete damage plastic (CDP) model was used to describe concrete material and viscous-spring artificial boundary was used to simulate infinite foundation. The peak acceleration of artificial seismic wave is 0.331g corresponding to rare earthquake action. The dynamic nonlinear time-history analysis was carried out aiming at a practical hydropower house structure. The results show that, the failure modes of hydropower house under rare earthquake action are severe cracks in downstream columns, slight cracks in upstream columns, wall and compressive damage in downstream columns. The concrete damage status, reinforcement stress and story drift angle indicate that the powerhouse has high safe capacity and the overall destruction is at the level of “repairable”. However, because of upstream and downstream walls’ inconsistent motion, the dynamic stress of roof net is very high and there exists risk of collapse. So the connection mode between roof net and upstream and downstream walls should be paid more attention in aseismic design of hydropower house.

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hydraulic structure / hydropower house / rare earthquake / failure mode / concrete plastic model / roof net

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HAO Jungang1, HU Lei2, WU Hegao1, FU Dan1. Study on failure mode of hydropower house superstructure under rare earthquake action[J]. Journal of Vibration and Shock, 2016, 35(3): 55-61

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