考虑P-△效应的钢筋混凝土空心高墩地震响应分析

摘要

Considering the two influence of internal force and deformation conditions, the finite element software ANSYS is used to simulate the seismic response for 78 m reinforced concrete hollow high pier. According to the Newmark - βTime History Analysis, the first two modal maps of piers were done under the Tianjin Seismis which was input into the high - piers. And according to the Newmark successive incremental method, the two modal maps were done under the coupling which includes p - A effects and seismic response. In the graph, seismis response value increases when p - A effects were considered. With the increase in height of the piers, the moment valve of pier buttom increases more and more. When the height of pier approaches 80 meters, it tends to line up.%在考虑二次内力和变形影响条件下,使用有限元软件ANSYS对78 m钢筋混凝土空心高墩的地震动力响应进行数值模拟.将天津地震波引入高桥墩,运用时程分析原理进行分析,得到桥墩的前两阶振型图；运用Newmark的逐次渐进法考虑P-△效应,得到藕合后的振型分析图.分析表明:考虑效应会增加响应幅值；随着桥墩高度的增加,墩底弯矩值增加幅度越来越大,当墩高接近80 m时,趋于直线增长.