横断面布置对PC简支转连续T梁桥受力性能影响分析

Effect of cross section arrangement on mechanical behavior of PC simply supported continuous T-beam bridge

以内蒙古宝贝河三跨预应力钢筋混凝土简支转连续T梁桥实际工程试验数据为依托,结合常见典型桥宽及桥高,利用有限元软件Midas Civil采用梁格法建立宝贝河大桥全桥模型,计算不同梁高及主梁间距对桥梁结构内力产生的影响.结果表明:将梁高设置为2.3m、2.5m、2.7m进行有限元模型计算,计算结构满足规范要求,但从受力及造价方面角度综合考虑,梁高设置为2.5m较合理;三种主梁间距的内力计算结构变化趋势相近,主梁个数的增减直接影响了结构的横向分布系数,使结构内力出现了重分配的现象,但是只改变了内力的大小,对内力的变化趋势影响较小.

Based on the actual engineering test data of Baohe three-span prestressed concrete simple-supported to continuous T-beam bridge in Inner Mongolia,combined with the common typical bridge width and bridge height,using the finite element software Midas Civil,the full bridge model of Baohe Bridge is established by using the grillage method,and the influence of different beam height and main beam spacing on the internal force of the bridge structure is calculated.The results show that the finite element model is calculated by setting the girder height to 2.3m,2.5m and 2.7m,and the calculation structure meets the requirements of the code,but considering the force and cost comprehensively,it is reasonable to set the girder height to 2.5m;the change trend of the internal force calculation structure of the three main girder spacing is similar,and the increase or decrease of the number of main girders directly affects the lateral distribution coefficient of the structure,which makes the internal force of the structure appear weight points.The matching phenomenon,however,only changes the size of the internal force,and has little influence on the change trend of the internal force.