钢筋混凝土双向偏心受力截面非线性分析

双向偏心受力构件的受力破坏过程与单向偏心受力构件相似.但加载后,截面的中性轴和荷载的作用平面不垂直,两个方向的合成挠度也不在作用平面内.本文从材料非线性本构关系出发,以平截面假定以及钢筋和混凝土之间无滑移为基础,通过逐级增加工作荷载来考察截面的变形和受力特征,对承受双向偏心荷载的钢筋混凝土截面进行了全过程分析.通过高斯积分的复核及有关文献的比较,结果吻合较好.

Nonlinear Analysis for Reinforced Concrete Sections under Biaxially Eccentric Loads

For concrete members subjected to biaxially eccentric loads and uniaxially eccentric loads,similar failure process applies,except that,under biaxially eccentric load,the neutral axis of a cross section is not perpendicular to the plane of the applied loading,and the combination of deflections in two directions does not lie in the loading plane either.Based on plane section assumption and perfect bonding between reinforcement and concrete,a full-range analysis for reinforced concrete sections under biaxially eccentric loads was carried out in this paper,considering nonlinear constitutive relationship of materials by increasing the applied biaxially eccentric loads step by step.The behavior of the loaded members was investigated.The calculation results were compared with theoretical calculations from Gaussian integration and experimental results from the references,it was found that good agreement was obtained.