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为研究空心板梁桥加宽在接缝结构受力局部承载的特性问题,考虑传统力学分析采用的受力图式和假设与实际结构有一定差异的情况,采用有限元建模的方法进行接缝结构设计的研究。接缝类型为铰接和刚接情况时,重点研究了新旧桥梁差异沉降、差异刚度、局部偏载等因素对拓宽桥梁受力影响。研究结果表明:(1)采用空心板边板翼缘直接刚接的加宽方式,较采用铰缝连接方式能更好地适应下部结构不均匀沉降的影响;(2)新旧主梁的模量差对于刚接缝和铰接缝均有增大横向弯拉应力的影响,采用铰缝连接方式增大幅度较大,采用刚接缝连接方式增大幅度较小;(3)不均匀沉降对横向弯拉应力影响较大,有明显的局部应力分布特性,为预防接缝早期强度破坏,两种接缝处均需要进行钢板加固。
In order to study the characteristic of hollow girder bridge widening the local load bearing in the joint structure, considering the force pattern and the hypothesis and the actual structure adopted by the traditional mechanics analysis, the method of finite element modeling Research on Structural Design. When the joint types are hinged and freshly connected, the factors such as differential settlement of old and new bridges, differential stiffness and partial load are mainly studied to broaden the stress of bridges. The results show that: (1) The widening mode of the flange directly connected to the flange of the hollow slab can be better adapted to the uneven subsidence of the lower structure than the hinge joint; (2) Poor for the just seams and hinge joints have increased the impact of lateral bending stress, the use of reaming joints increased by a large margin, the use of just seams connection increased less; (3) uneven settlement of horizontal Bending and pulling stress has a great influence, and there are obvious local stress distribution characteristics. To prevent the early strength failure of the joint, both seams need to be reinforced.