中文摘要：

为了对新型钢管混凝土腹杆-PC组合箱梁桥结构的抗震性能进行研究，在既有普通预应力混凝土连续箱梁桥的基础上设计了新型钢管混凝土腹杆-Pc组合箱梁桥，利用ANSYS有限元软件分析了其自振特性和天津波作用下的抗震性能，同时对比分析普通PC连续箱梁桥和钢管混凝土腹杆-Pc组合箱梁桥的地震响应。结果表明：与普通箱梁桥相比，钢管混凝土腹杆-Pc组合箱梁桥高阶振型差异较大，低阶振型相似；在不同方向的地震波输入下，钢管混凝土腹杆-Pc组合箱梁桥位移响应和竖向剪力增大，内力响应减小；钢管混凝土腹杆对混凝土顶底板的约束作用较弱，易使其在地震作川下局部振动剧烈。建议加强约束和横撑布置，以改善钢管混凝土腹杆-PC组合箱梁桥动力特性。

英文摘要：

A new concrete filled steel tube web member-PC composite box girder bridge was de- signed on the basis of present prestressed concrete continuous box girder bridges to study the seismic performance. The free vibration behaviors and the seismic performance under the action of Tianjin wave was studied by the finite element software ANSYS, and the seismic response of present pres- tressed concrete continuous box girder bridges and the new concrete filled steel tube web member-PC composite box girder bridge was compared. The results show that the high order modes of concrete filled steel tube web member-PC composite box girder bridge are different from one another, and the low order modes are similar. Under different seismic inputs, the displacement response and vertical shear of the new concrete filled steel tube web member-PC composite box girder bridge are in- creased, and the internal force response is reduced. The restriction effect of concrete filled steel tube web member to the top and bottom concrete plate is weaker, which makes the top and bottom concrete plate vibrate easily. Finally, it is suggested that enhancing the arrangement of restriction and brace may change the dynamic characteristics of the concrete filled steel tube web member-PC composite box girder.