论文部分内容阅读
对钢箱梁中非弹性剪滞性能进行研究。带翼缘受弯构件中的剪滞效应经常被认为是不均匀的纵向变形和沿翼缘的正应力。弹性剪滞性能被广泛研究并在结构设计中给予考虑,然而对非弹性剪滞涉及较少。带翼缘受弯构件在其极限状态下可能会发生塑性变形,故采用基于最小功的方法来模拟非弹性剪滞性能。在非弹性剪滞模型中,有效模量采用公式表达,泊松比按塑性理论取值。通过两个钢箱梁的试验结果对该分析方法进行验证。经与试验数据对比后表明,所给出的变分法可以精确地得到钢箱梁的塑性正应变分布和变形。
Study on inelastic shear lag in steel box girder. Shear lag effects in flanged flexural members are often considered as non-uniform longitudinal deformation and normal stress along the flange. Elastic shear lag performance has been extensively studied and considered in structural design, however less involved in inelastic shearing. Bending members with flanges may undergo plastic deformation at their ultimate state, so a method based on the least work force is used to simulate the inelastic shear lag behavior. In inelastic shear lag model, the effective modulus is expressed by the formula, Poisson’s ratio is based on the plastic theory. The analysis method is verified by the test results of two steel box girders. The comparison with the experimental data shows that the given variational method can accurately obtain the plastic normal strain distribution and deformation of the steel box girder.