桥墩长细比对地震反应谱响应的影响分析

采用ANSYS有限元分析程序，对某连续刚构桥进行了不同桥墩长细比情况下地震反应谱响应分析。由于改变长细比的方法不同，模型分为2组，第1组中改变桥墩沿纵桥向长度，第2组中改变桥墩高度，地震反应谱采用《公路桥梁抗震设计细则》（JTG／TB02—01—2008）中规定的设计加速度反应谱。研究结果表明：桥墩的长细比对连续刚构桥梁地震反应影响显著；随桥墩长细比增大，地震作用时，墩顶和墩底的受力将减小，但当桥墩长细比达到某一数值时，再增大长细比，桥墩受力变化将不再显著。

Effect Analysis of Pier Slenderness Ratio on Seismic Response Spectrum

In order to research the effects of pier with different slenderness ratios on a continuous rigid framed bridge structure,ANSYS finite element method is used to analyze seismic response spectrum. According to the ways of changing the slenderness ratio of piers,the models are divided into two groups. The first group changed pier＇s length along the longitudinal,while the second changed pier＇s height. The design acceleration seismic response spectrum was defined by ＂Guidelines for Seismic Design of Highway Bridges （JTG/T B02-01--2008）＂. Major findings obtained from this study are as follows：the effect of slenderness ratios on seismic response of continuous rigid-framed bridge is significant;the internal force in the top and bottom of pier reduced with slenderness ratio increased, but it would be no longer significant when the slenderness ratio researches a certain value.