建筑变形后幕墙结构屈曲破坏临界荷载研究

Critical Load for Buckling Failure of Curtain Wall Structures after Deformation of the Building

为解决传统建筑沉降变形中存在的幕墙结构易发生变形、稳定性较差等问题,提出建筑沉降变形中幕墙结构屈曲稳定临界荷载的研究。选取框架玻璃幕墙作为研究对象,建立玻璃面板的有限元模型,分别从X、Y、Z三个方向对玻璃面板施加平动自由度约束力,进行幕墙结构屈曲稳定临界荷载的模拟;然后在建筑底部不同节点处设置竖向弹簧,通过调节弹簧刚度模拟建筑沉降变形的竖向作用力,在此基础上,采用能量法分别计算玻璃肋的应变势能、外力势能和弹性约束势能,根据势能驻值原理计算得出建筑沉降变形中幕墙结构屈曲稳定临界荷载;最后设置不同的玻璃肋参数,选取单一变化因素进行实验。实验结果表明:在不同玻璃肋跨度和截面厚度对比下,所提方法的计算结果较为准确,且所提方法的临界荷载计算耗时低于其他方法,具有较高的实际应用价值。

To solve the problems of curtain wall structures in the traditional deformation of building settlements,research on the critical load of buckling stability of the curtain wall structure in the deformation of building settlements was proposed.The glass curtain wall of the structure was selected as a research object;a finite element model of the glass panel was established to simulate the critical load of the buckling stability of the curtain wall structure.The vertical springs were placed in different nodes at the bottom of the building,and the vertical force of the building's deformation was simulated by adjusting the spring stiffness.On this basis,the potential deformation energy,the potential energy of external force and the potential energy of elastic restriction of the glass rib were calculated by the energy method.Then,the critical load of the buckling stability of the curtain wall structure in the deformation of the building's settlement was calculated according to the principle of the potential value of the standing energy.Different glass rib parameters were established and the single variable factor for the experiment was selected.The experimental results showed that the results of the calculation of the proposed method are accurate and the calculation time of the critical load of the proposed method is less than that of other methods.