【作者】 宋波； 牛立超； 卞淑媛；

【Author】 SONG Bo;NIU Li-chao;BIAN Shu-yuan;University of Science and Technology Beijing;Beijing International Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area;

【机构】 北京科技大学土木与环境工程学院； 强震区轨道交通工程抗震研究北京市国际科技合作基地；

【摘要】 强震作用下,冰水域桥墩受到动水压力与动冰荷载的的双重影响,基于Morison动水理论和Croteau动冰力模型,建立了冰水域桥墩动力响应简化计算模型,采用增量动力分析法(IDA法)研究了不同类型地震波作用下冰厚和水深对结构抗倒塌性能的影响规律。结果表明:相同地震强度下,有冰工况下桥墩结构的破坏率和墩底最大曲率较无冰时显著增加,有冰时墩底最大曲率较无冰时最大增加21.03倍;相对于近场地震波,远场波作用下墩底曲率响应较大,近场地震波作用下桥墩结构破坏出现100%破坏率对应的地震动强度较远场地震波增大1倍以上。更多还原

【Abstract】 Under seismic actions,bridge piers located in icy water are subject to both hydrodynamic pressure and dynamic ice force,based on the Morison hydrodynamic theory and Croteau dynamic ice force model,a simplified calculation model of dynamic response for pier column structures in ice-plagued area has been established.With the incremental dynamic analysis method,variation characteristics of anti-collapse capacity of piers have been analyzed under various seismic waves,ice thickness and water depth.The result shows that destruction rates and maximum curvature at the bottom of pier with ice are significantly greater than the case without ice,maximum curvature at the bottom of pier increases up to a maximum of 21.03 times than the case without ice.The dynamic response under far-field waves are greater than the case under near-field waves,the seismic action intensity corresponding to the complete failure of pier column structures under near-field waves have doubled than the case under far-field waves.更多还原