考虑滑移的钢-混凝土组合箱梁畸变效应研究

Distortion effect analysis of a slip in steel-concrete composite box girder

通过引入滑移转角位移函数,建立考虑滑移的畸变翘曲正应力,基于势能驻值原理,推导考虑滑移效应的畸变微分方程。定义了一个畸变的滑移影响系数κ,此系数仅与混凝土与钢材材料特性、栓钉类型及栓钉布置形式有关,并给出均布荷载和集中荷载作用下的微分方程初参数解。建立一个考虑滑移的钢-混凝土组合箱梁的Ansys有限元模型,均布荷载作用下畸变应力与畸变角与本文理论吻合良好,验证了本文理论的正确性。将考虑滑移与不考虑滑移的结果进行对比,分析表明,均布荷载作用下考虑滑移的畸变角与畸变翘曲均小于不考虑滑移的情况,且考虑滑移的畸变角更加接近于有限元计算结果。重新定义了考虑滑移的畸变矩和畸变双力矩且考虑滑移影响的结果均大于不考虑滑移的结果。

By introducing the slip Angle displacement function,the distortion warping stress considering the slip effect was established.Based on the principle of stationary potential energy,the differential equation for distortion considering the slip effect was derived as well.With the distorted slippage influence coefficientκdefined which is only related to the material properties of concrete and steel,the type and arrangement of the pins,the initial parameter solutions of the differential equations under uniform and concentrated loads are provided.Based on the established Ansys finite element model of a steel-concrete composite box girder considering slip effect,the distortion stress and distortion angle under a uniform distributed load were found to be consistent with the theory proposed in this paper,adding weights to the correctness of the theory in this paper.By comparing research results with and without a slip,it is found that the distortion angle and distortion warpage with a slip is smaller than those without slip under a uniform load and closer to the finite element calculation results.Taking the slip effect into consideration,the distortion bi-moment and moment are redefined and found to be greater than those without the slip.