钢筋混凝土空间杆件精细非线性分析模型

Precise nonlinear model of reinforced concrete space bar member

针对现有钢筋混凝土空间杆件非线性分析模型进行了评述,应用结构力学方法推导得到了沿杆长配筋分布均匀的钢筋混凝土空间杆件的非线性单元刚度矩阵,建立了应用高斯积分点所在截面的非线性性质描述钢筋混凝土空间杆件非线性的计算过程。对于沿杆长配筋分布不均匀的杆件,根据其实际情况,将其细分为两段或三段沿杆长配筋分布均匀的杆段,以沿杆长配筋分布均匀的钢筋混凝土空间杆件非线性分析模型为基础,建立了沿杆长配筋分布不均匀的空间杆件的非线性分析模型。最后,给出了两个算例,就本文方法及程序的计算结果与模型结构振动台试验结果、常规非线性杆件模型的计算结果进行了比较。

By using structural mechanics method, the stiffness matrix of reinforced concrete space bar with invariant reinforcement arrangement distribution along the bar has been derived; the nonlinear behavior of space bar member is described by the nonlinear behavior of several Gauss Quadratic place sections. For matching the space bar with variant reinforcement arrangement distribution along the bar, this type of space bar is divided into two or three segments with invariant reinforcement arrangement distribution along the bar, and its stiffness matrix is derived on the basis of the stiffness matrix of reinforced concrete space bar with invariant reinforcement arrangement distribution along the bar. Finally, the experimental results of model structure and the analytical results of a reinforced concrete space frame by using the convectional 3-D element model are used to compare with the analytical results by using the proposed model. It is shown that the proposed model and analysis method are applicable and feasibility.