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为研究拼接拓宽的不同方式对旧桥活载受力的影响,以某T梁桥为背景,建立了12种拓宽方式的三维实体有限元模型,计算了每种方式中旧梁的荷载横向分布系数,并进行对比分析。结果表明:增加新旧梁刚度比、设置新旧梁横隔板及提高横隔板高度能较大幅度减小旧梁的荷载横向分布系数;此外,相对于单侧拓宽,对称拓宽下旧梁的荷载横向分布系数更小。因此,为减小拓宽后旧桥的活载受力,在其他条件允许的前提下,建议适当增加新旧梁刚度比,并在新旧梁间设置横隔板及增加横隔板高度,具体取值应结合实际工程确定。
In order to study the influence of different ways of splice broadening on live loads of old bridges, 12 kinds of three-dimensional finite element models of broadening mode were established on the basis of a T girder bridge, and the transverse load distribution of old girders in each mode was calculated Coefficient, and comparative analysis. The results show that increasing the rigidity ratio of new and old beams, setting the new and old girder diaphragm and increasing the height of the diaphragm can greatly reduce the lateral load distribution coefficient of the old girder. In addition, compared with the unilateral widening, the load of the old girder The horizontal distribution coefficient is smaller. Therefore, under the condition of other conditions, in order to reduce the live load of the old bridge after widening, it is suggested to increase the rigidity ratio of new and old girders properly and to set the horizontal partition between the old and the new girders and to increase the height of the horizontal bulkhead Should be combined with the actual project to determine.