大跨径预应力混凝土连续梁桥无缝拓宽影响因素分析

Influence Factors Analysis for a Long-Span PC Continuous Girder Bridge Broadened with Seamless Method

摘要: 受大跨径连续梁长期变形特点的影响，其无缝拓宽受到收缩徐变、支座沉降、预应力损失等因素影响明显。本文以某大跨径连续混凝土桥梁为例，采用空间有限元程序，研究大跨径预应力混凝土连续梁桥拓宽时，五个时间段因素导致拓宽后桥梁接缝的受力特点，分析接缝处应力作用机理，为相应的拼接缝设计与施工提供理论依据。

Abstract: In view of the deformation characteristics with time of long-span continuous beam, the creep and shrinkage, bearing settlement and loss of prestress impacted mechanical behaviours obviously. This paper selected a long-span continuous prestressed concrete (PC) girder bridge as an example, used the spatial finite element program, and analyzed the deformation and stress with different broaden times to study the influence on the seam with mechanism. The corresponding conclusions provided the theory basis for design and construction of broaden bridge.