【摘要】 分析了几何非线性对某混凝土斜拉桥时程动力分析的影响程度。建立主跨480m混凝土斜拉桥空间有限元模型,进行了成桥模态分析并分别计算了线性与几何非线性地震动力时程反应,比较了关键控制部位的响应,得到结论:考虑几何非线性影响时,斜拉桥主梁纵向位移幅值比线性时高出7%,右塔顶顺桥向位移幅值较线性时约大25%,几何非线性对大跨混凝土斜拉桥结构地震位移反应影响十分显著。塔底主压应力幅值高出4%,几何非线性对斜拉桥结构地震反应内力影响显著。更多还原

【Abstract】 Analyzed geometric nonlinear influence on dynamic analysis response of long span concrete cable-stayed bridge.Built the pace finite element model of the bridge which has the main span of 480 meters long.Executed the modal analysis of the bridge model and calculated seismic dynamic time history response in linearity and geometric nonlinearity,the responses of the key control parts were compared and got the conclusion: when consider geometric nonlinear effect,bridge girder longitudinal displacement amplitude was 7% higher than in linear condition,the right bridge-tower top displacement amplitude was 25% higher than in linear condition,geometric nonlinearity has a significant effect on seismic displacement responses;main stress amplitude of the tower bottom was 4% higher than in linear condition,geometric nonlinearity has no a significant effect on seismic stress responses.更多还原