门楼式主副塔混凝土横向连接关键受力性能分析与优化

悬索桥牌坊门楼式索塔的主副塔连接横梁通常不作为主受力构件,但是施工方法的不同会导致主副塔之间由于竖向力差异引起相对位移,并且随着徐变和温度长期荷载作用下连接横梁会出现开裂等问题。而这一问题在设计上往往被忽视。综合分析上下连接横梁的受力性能,并结合不同的施工方案,评价连接时机对其受力性能的影响及对桥塔横向稳定性的影响。通过空间杆系有限元模型和三维实体模型作为主要分析手段,分析不同荷载对连接横梁受力性能的影响,包括横梁应力、裂缝及施工过程中的稳定性,并对连接横梁的构造尺寸进行优化分析,为同类设计提供参考。

Analysis and Optimization on Key Stress Performance of Concrete Transverse Connection between Main and Auxiliary Gate-type Pylons

The crossgirder connecting the main and auxiliary pylons of the archway-type pylon of suspension bridge is usually not designed as a main stressed member.But the differential construction methods will cause the relative displacement between the main and auxiliary pylons because of the vertical force difference.And with creep and temperature under long-term load,the connecting crossgirder will crack.This problem is often neglected in the design.By comprehensively analyzing the stress performance of upper and lower connecting crossgirders and combined with the different construction schemes,the influences of connection time on its stress performance and on lateral stability of pylon are evaluated.The finite element model of spatial member system and the 3D solid model as the main analysis means are used to analyze the influences of different loads on the stress performance of connecting crossgirder including the crossgirder stress,crack and stability during construction.The structural dimensions of connecting crossgirder are optimized and analyzed,which can be referred for the similar designs.