转动弹簧宏模型模拟剪力墙受力性能

Macro-modeling of rotational spring simulating behavior of RC wall

本文将剪力墙结构根据精度需要划分成若干6节点矩形单元,每个单元由2根斜置正交弹簧及联结的上下水平刚性横杆组成,2根斜置弹簧方向分别与外力作用下的主拉、压应力方向一致。本文引入单元位移场线性假定及斜压场理论计算弹簧内力,根据变形协调条件由单元结点位移计算弹簧变形,由弹簧刚度及倾角推导了该宏模型单元刚度矩阵,迭代计算使结构内力及位移逼近真值。算例分析表明,该模型能较好地反映剪力墙的受力性能。

A shear wall is divided into several six-node rectangular members according to the requirement of precision. Each member is composed of two oblique placed orthogonal springs and horizontal top and bottom rigid rods connected by springs. The direction of springs is in accordance with the main tension and compression stress when an external force is acting on the shear wall. The paper introduces the hypothesis of member linear displacement and modifying compression theory when calculating the internal force of springs. The deformation are computed on the basis of the node displacements according to the deformation harmony conditions and the stiffness matrix of the members is derived from the stiffness and angle of springs. The true value of internal force and displacement is gradually approximated by iterative calculation. It is shown that the model can well exhibit the behavior of shear wall when it is applied by forces.