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以厦漳高速公路凤山分离立交大桥拓宽改造为背景,对斜交空心板梁桥拓宽改造纵向接缝连接问题进行试验研究,分析比较不同纵向接缝连接方式桥梁关键截面的应力分布、挠度与荷载横向分布等静力特性,同时通过数值分析比较了不均匀沉降引起的不同接缝连接桥梁的受力性能。结果表明:(1)刚性连接模型的整体性能略优于铰接连接模型;(2)新旧桥翼缘根部及接缝段在不利荷载工况作用下处于弹性工作范围;(3)大斜交拼宽桥梁在受力时呈现比较明显的弯扭耦合的特征,要求接缝连接具有更好的整体性。根据分析结果,推荐采用刚接连接方式,且沉降控制在5 mm以内。
Taking the expansion and reconstruction of Fengshan separation overpass bridge in Xiamen-Zhangzhou Expressway as an example, the connection and connection of longitudinal joints between the two sides of slanting hollow slab-beam bridges are analyzed and compared. The stress distribution, Load isostatic characteristics of transverse distribution, at the same time by numerical analysis of the uneven settlement caused by different joints of the bridge connected with the force performance. The results show that: (1) the overall performance of the rigid connection model is slightly better than the hinged connection model; (2) the root and joint sections of the old and new bridge flanges are in elastic working range under adverse load conditions; (3) When the bridge is subjected to force, it presents the obvious characteristics of bending-torsion coupling, which requires the joint connection to have a better integrity. According to the analysis result, it is recommended to adopt the connection mode of just-connected, and the settlement control should be within 5 mm.