高墩大跨连续刚构桥抗震设计参数优化

对影响高墩大跨连续刚构桥抗震能力的设计参数进行了分析,对白沙河特大桥不同墩厚模型进行了设计地震下的反应谱分析和时程分析,根据不同墩厚情况下的墩底应力变化趋势图得出了该桥的合理墩身厚度。对采用此优化厚度的结构进行了罕遇地震作用下的弹塑性时程反应分析,结果表明:该桥具有良好的抗震性能。建议在设计高墩大跨连续刚构桥时对墩厚进行优化。

Optimization of Design Parameters of High-pier and Long-span Continuous Frigid Frame Bridge

The design parameters were analyzed that have influence on the anti-seismic capability of the high-pier and long span continuous frigid frame bridge.The spectrum analysis and time-series analysis for Baishahe super large bridge under the design earthquake were also done,and then the rational width of the pier was acquired according to the change curve of stress of the pier bottom for different width.The inelastic time-series analysis under the earthquake of the intensity seldom occurred was done on the bridge with rational width,and the results indicate that the bridge have a good performance in resisting earthquake.It was suggested that the width of the pier for the high-pier and long-span continuous frigid frame bridge should be optimized in design.