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用简化的附加水质量模型考虑动水压力对桥墩的影响,用动冰力模型考虑冰与桥墩的相互作用,建立了冰水域单柱式桥墩地震反应的动力计算模型,并利用时程分析法研究了在不同类型地震作用下海冰对桥墩非线性地震反应的影响.桥墩的最不利反应一般发生在海冰质量为5×106～5×107kg,可作为桥墩设计时的海冰质量;且墩底截面出现最大曲率时对应的海冰质量随着水深的增大而变大.有冰时墩底截面曲率延性需求系数、墩顶最大位移和墩顶残余位移比无冰时增大数倍,墩底截面弯矩–曲率滞回曲线呈倒“S”型更显著,桥墩的变形和耗能能力显著下降.同时,与近场地震波作用时相比,远场地震波作用下海冰对单柱式桥墩顶部最大位移和残余位移的影响更大.
Considering the influence of hydrodynamic pressure on bridge piers with simplified additional water quality model, the dynamic interaction between ice and bridge piers is considered by the dynamic ice force model, and the dynamic calculation model of seismic response of single column pier in ice-water area is established. The influence of sea ice on the nonlinear seismic response of bridge piers under different types of earthquakes is studied.The most unfavorable reaction of bridge piers usually occurs when the mass of sea ice is 5 × 106 ~ 5 × 107 kg, which can be used as the quality of sea ice when the pier is designed. The sea ice mass corresponding to the maximum curvature at the bottom cross section becomes larger with the increase of water depth.The curvature ductility demand coefficient at the pier bottom section with ice, the maximum displacement at the pier top and the residual displacement at the pier top are several times larger than those without ice, The bending moment-curvature hysteretic curve of the pier-bottom section is more pronounced and the deformation and energy dissipation capacity of piers are significantly reduced.While compared with the action of near-field seismic waves, The maximum displacement of column piers and the influence of residual displacement are greater.