伸缩缝间距对不等高梁桥纵向抗震性能影响

Effect of expansion joint distance on longitudinal shock resistance of unequalsorghum bridge

针对设置有限位墩的中西部常见不等高梁桥,研究受纵桥向地震作用时,桥梁伸缩缝间距对不等高梁桥动力响应的影响。以ABAQUS有限元分析为主要研究手段,考虑主梁与桥台、桥墩等构件之间的碰撞,应用三维接触-摩擦模型和显式非线性分析方法,建立了两种不同墩高形式的不等高梁桥模型。桥墩不等高形式分别为"斜直线"和"v字形",以研究不同的伸缩缝间距对不同不等高形式动力响应的影响。研究结果表明:伸缩缝间距的增大对于不等高梁桥动力响应的影响总体上呈现出逐渐减小的规律。综合比较,当伸缩缝间距设置为16cm时能够取得较低墩底内力和墩梁相对位移。

For the common unequal girders in the central and western parts with finite piers,the influence of bridge expansion joint spacing on the dynamic response of unequal girders can not be ignored. Taking ABAQUS finite element analysis as the main research method,considering the collision between the main beam and the abutment,pier and other components,the three-dimensional contact-friction model and the explicit nonlinear analysis method are used to establish two different types of pier heights. Sorghum bridge model. The unequal heights of the piers are'oblique straight'and'vshaped'to study the influence of different expansion joint spacing on the dynamic response of different unequal forms. The results show that the influence of the increase of the expansion joint spacing on the dynamic response of the unequal height bridges generally shows a decreasing law. Comprehensive comparison,when the expansion joint spacing is set to 16 cm,the lower pier internal force and the relative displacement of the pier beam can be obtained.