拼接方式对PC连续刚构桥力学性能的影响

基于空间有限元分析方法，研究大跨度预应力混凝土连续刚构桥按刚接和铰接2种不同的拼接方式在车辆荷载、收缩徐变、基础不均匀沉降等作用下的桥梁结构受力性能。分析结果表明：不同的拼接方式对桥梁结构的纵向应力影响不大．但是对结构的横向应力和整体刚度影响较大；刚接结构在基础不均匀沉降和车道荷载作用下的效应更为不利；施工时需采取特别措施防止铰接处的纵向裂缝并加强结构的横向连接刚度，对于解决同类桥梁的拼接技术难题具有一定的参考意义。

Influence of extended form on mechanical properties of PC continuous rigid frame bridge

Based on spatial finite element analysis method, the structure connection and hinged connection of long - span pre - stressed concrete performance of two different forms, rigid continuous rigid frame bridge was ana- lyzed in terms of vehicle load, the effect of concrete shrinkage and creep, non - uniformity settlement of founda- tion etc. The results show that two different ways of connection form have a minor effect on the longitudinal stress of the bridge structure, but the influence on the transverse stress of structure and the integral rigidity is relative large. Rigid connection structures poss unfavorable effect under the uneven settlement of foundation and lane loads. Special measures should be taken in construction to prevent the longitudinal cracks in the articulated sec- tions and the transverse coupling stiffness of the structure should be strengthen, which has certain reference sig- nificance in solving similar splicing technology issues in bridge engineering.