横向地震波冲击下建筑结构稳定性变化分析

高层EPS法分析横向地震波冲击下建筑结构稳定性变化时,未进行横向地震波随机过程数学模拟,获取的横向地震波与实测不符,提出一种新的横向地震波冲击下建筑结构稳定性变化分析方法,采用三角级数型非平稳随机过程模型函数,模拟横向地震波非平稳性特征,得到横向地震波模拟曲线,根据该曲线建立建筑结构稳定性动力运动方程,运用Hilber-Hughes-Taylor递推格式求解该方程的安全系数,安全系数越高建筑结构稳定性越强。为研究建筑结构在横向地震波反复荷载作用下的稳定性状态,运用弹塑性损伤模型模拟建筑结构核心筒墙体混凝土,得到用于分析建筑结构稳定性的最大、最小特征值。实验结果表明,所提方法能够分析建筑结构稳定性变化,横向地震波冲击前5 s对建筑结构稳定性影响最大。

Stability Analysis of Building Structures Subjected to Transverse Seismic Waves

When the high-level EPS method is used to analyze the stability changes of the building structure under the impact of horizontal seismic waves,no mathematical simulation of the random process of the horizontal seismic waves has been carried out. The obtained horizontal seismic waves are inconsistent with the actual measurements,and a new method for analyzing the stability of the building structure under the impact of horizontal seismic waves is proposed. Using the trigonometric series non-stationary random process model function to simulate the non-stationary characteristics of transverse seismic waves,the transverse seismic wave simulation curve is obtained. According to the curve,the dynamic motion equation of building structure stability is established,and the safety coefficient of the equation is solved by Hilber-Hughes-Taylor recursive push format. The higher the safety factor,the stronger the stability of the building structure. In order to study the stability of the structure under the repeated load of transverse seismic waves,the ElastoPlastic damage model is used to simulate the core wall concrete of the building structure,and the maximum and minimum characteristic values used to analyze the stability of the building structure are obtained. The experimental results show that the proposed method can analyze the structural stability of buildings,and the effect of 5 seconds before transverse seismic wave impact on structural stability is greatest.