考虑腐蚀效应的钢筋混凝土烟囱风致易损性分析  

Wind-induced Vulnerability Analysis of Reinforced Concrete Chimneys Considering Corrosion Effects

作　　者：张肖 范存新[1] ZHANG Xiao;FAN Cunxin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《广东土木与建筑》2024年第3期87-91,96,共6页Guangdong Architecture Civil Engineering

摘　　要：选取某钢筋混凝土高耸烟囱为研究对象,利用ABAQUS软件建立不同腐蚀程度的有限元模型并对其进行风致易损性分析。首先考虑材料性能的劣化,然后采用线性滤波法模拟出脉动风速并验证其有效性,对不同腐蚀程度的烟囱进行了数值模拟分析,通过Pushover分析得到基底剪力-位移曲线,从而获得不同极限状态的性能点,最后考虑风速和材料的不确定性进行风致易损性分析,绘制出不同腐蚀程度的烟囱风致易损性曲线并进行对比研究。研究结果表明:相较于其它结构形式的高耸结构,致该烟囱倒塌破坏的风速为57 m/s左右,有着较强的抗倒塌能力;烟囱在服役的过程中,腐蚀效应的加剧会导致烟囱达到同一破坏状态的极限风速逐渐减小,因此在钢筋混凝土烟囱的抗风设计中,需要考虑烟囱在服役过程中的腐蚀效应。A high-rise chimney of reinforced concrete is selected as the research object,and the finite element model with different corrosion degrees is established by ABAQUS software and its wind-induced vulnerability is analyzed.Firstly,the deterioration of material properties is considered,and then the pulsating wind speed is simulated by linear filtering method and its effectiveness is verified,the chimneys with different corrosion degrees are numerically simulated and analyzed,the base shear-displacement curves are obtained through Pushover analysis,so as to obtain the performance points of different limit states,and finally the wind vulnerability analysis is carried out considering the wind speed and material uncertainty,and the wind vulnerability curves of chimneys with different corrosion degrees are drawn and compared for study.The results show that compared with other structural forms of towering structures,the wind speed of the chimney collapse failure is about 57 m/s,and it has strong anti-collapse ability.In the process of service of the chimney,the intensification of the corrosion effect will lead to the gradual decrease of the limit wind speed of the chimney to reach the same failure state,so in the wind-resistant design of the reinforced concrete chimney,the corrosion effect of the chimney during service needs to be considered.

关 键 词：风致易损性 腐蚀效应 时程分析 回归分析 

分 类 号：TU375[建筑科学—结构工程]