钢筋混凝土水塔风致易损性分析

Analysis on Wind-induced Vulnerability of Reinforced Concrete Water Tower

为了更好地评定水塔的抗风性能,文章以某钢筋混凝土水塔结构为原型建立有限元模型并对其进行风致易损性分析。采用线性滤波法模拟出脉动风速并验证其有效性,通过ABAQUS软件对水塔进行数值模拟分析,将破坏状态发生概率密度曲线引入水塔的风致易损性分析中,计算出水塔结构达到各类破坏状态的超越概率和破坏状态的发生概率。绘制出水塔在有孔洞方向和无孔洞方向的易损性曲线与破坏状态发生概率密度曲线,并将两个方向的曲线进行对比研究。研究结果表明:该水塔在发生倒塌破坏时的风速较高,在强风作用下抗倒塌能力较强;水塔结构有孔洞方向的破坏状态发生概率和超越概率均大于无孔洞方向,因此在水塔的抗风设计中,水塔孔洞对于该方向风致破坏的影响需引起重视。

In order to better evaluate the wind resistance of water towers,this paper establishes a finite element model of a reinforced concrete water tower structure as a prototype and analyzes its wind vulnerability.A linear filtering method is used to simulate the pulsating wind velocity and verify its validity.The structure is numerically simulated by ABAQUS software,and the damage probability density curve is introduced into the wind vulnerability analysis of the water tower to calculate the transcendence probability and damage probability of the structure to reach different damage states.The susceptibility curves and damage state occurrence probability density curves of the structure in the direction with and without holes are plotted respectively,and the curves in the two directions are compared and studied.The results show that the wind speed of the water tower is higher when collapse damage occurs,and the collapse resistance is stronger under strong wind;the probability of damage state occurrence and transcendence probability of the water tower structure in the direction with holes is greater than that in the direction without holes,therefore,in the wind resistance design of the water tower,the influence of holes on wind damage in this direction needs to be paid attention to.