考虑剪力滞和局部稳定影响的钢板梁应力分析

Analysis on Stress of Steel Plate Beam Considering Shear Lag and Local Stabilizing Influence

钢板梁桥翼缘板受剪力滞效应和局部稳定的影响,其纵向应力沿横向分布是不均匀的。结合工程实例,若按初等梁理论计算平均应力结果偏小,存在安全隐患;采用有限元法模拟计算,可以精确地求得沿横向任意处的弯曲应力及其沿横向的分布情况,但建模过程复杂、工作量大;参照现行规范采用有效分布宽度的方法简化计算,结果偏于保守,可作为工程设计的参考依据。

The flange slab of steel plate beam bridge is influenced by the shear lag effect and local stability.Its longitudinal stress distribution along the transverse is not uniform.Combined with the engineering examples,the average stress is too small if calculated by the elementary beam theory,and there is a potential safety risk.The simulated calculation of finite element method can accurately obtain the bending stress anywhere along the transverse and its distribution along the transverse,but the modeling process is complex and the workload is large.According to the current code,the method of effective distribution width is adopted to simplify the calculation.The result is partial to conservative,which can be used as a reference for engineering design.