温度梯度模式对一座变截面连续箱梁桥主应力的影响分析

箱形截面整体性好,结构刚度大,能承受正负弯矩,且抗扭能力强,是一种经济合理的截面形式,近年来得到广泛应用,但建成后通过一定时间的运营,发现箱梁简支端附近腹板开裂较严重,结合一座预应力混凝土变截面连续箱梁桥实例,采用空间有限元分析仿真计算,结果表明温度梯度模式对箱梁腹板的主拉应力影响较大。

Impact Analysis of Temperature Gradient on Principle Stress of a Variable Cross- section Continuous Box Girder Bridge

Box section is an economically reasonable section form with good integrity,large structural rigidity,capacity to bear positive and negative bending moment,and strong torsional resistibility,which is widely applied in recent years.However,through operation for a certain time after completion,it is found that the cracking of web around box girder simply supported end is serious.With an instance of prestressed concrete variable cross-section continuous box girder bridge,space finite-element analysis stimulation calculation is adopted and the results show that temperature gradient has a great influence on the principle stress of web of box girder.