预应力混凝土连续弯箱梁桥动力特性分析与试验研究

Dynamic analyses and experiment studies on the prestressed concrete continuous curved box-girders

通过某预应力混凝土连续弯箱梁桥的有限元分析,并借助脉动试验和跑车试验,对预应力混凝土连续弯箱梁桥的动力特性进行研究。结果表明,该桥自振频率略高于理论计算值,结构动力刚度满足设计要求。为研究弯曲程度对连续弯箱梁桥动力特性的影响,对圆心角从0°到76°的弯桥进行计算,结果表明,随着圆心角的增大,该桥纵向频率逐渐增大,而横向频率逐渐减小。

The dynamic characters of a prestressed concrete continuous curved box-girder are studied by the finite element analysis,the pulsating method and the running-truck experiment. It is confirmed that the tested result for the curved box-girder is greater than the calculated result,and the dynamical stiffness accords with the design requirement.In order to find the effect of central angle on the dynamic characters,the dynamic analyses of curved box-girders with different central angle are carried,and it is shown that the longitudinal frequency of the curved box-girders is decreased as the central angle increases while the transverse frequency is increased.