简支梁式渡槽考虑流固耦合的横向地震三维动力响应分析

Study on Lateral Seismic 3D Dynamic Response of Simply Supported Beam Aqueduct Considering FSI

以横向地震作用下的大跨度简支梁式渡槽为对象,研究其在行波效应以及渡槽两端支撑不同高时的三维流固耦合响应。研究表明支撑不等高的渡槽,由于其两端刚度不均匀,槽身侧移受到较大影响,刚度变小则侧移变大,反之亦然。研究还表明,行波效应对渡槽的影响比较明显,激励一致情况下的槽身各截面侧移峰值要明显小于激励不一致的情况,但是槽身各截面的弯矩却恰恰相反,激励一致情况下的各截面弯矩峰值要明显大于激励不一致的情况。

large-span simply supported beam aqueduct is taken as the research object in this paper, its 3D dynamic response considering FSI is studied, as well as, lateral seismic traveling wave effect and unequal height supports effect. Research shows that, for unequal height support aqueduct, the lateral displacement of aqueduct body will be affected because of non-uniform stiffness at both supports, the larger lateral displacement of aqueduct body as smaller lateral stiffness smaller , and vice versa. The study also shows that the traveling wave effect has more obvious influence on the response of aqueduct, the lateral displacement peak of aqueduct body in case of uniform excitations is obvious smaller than that in case of non-uniform excitations. Contrary, the cross-section moment peak of aqueduct body in case of uniform excitations is obvious larger than that in case of non-uniform excitations.