高聳煙囪結(jié)構(gòu)在地震作用下的動力時程分析*
劉記雄1，黃俊1,2，戴紹斌2
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(1 武漢理工大學(xué)土木工程與建筑學(xué)院，武漢 430070；2 武漢理工大設(shè)計研究院有限公司，武漢 430070)[摘 要] 通過Rayleigh法對高聳煙囪結(jié)構(gòu)進行振動分析，采用ANSYS建立高聳煙囪有限元模型，分析混凝土煙囪在水平和豎向地震共同作用下的地震響應(yīng)。研究表明：將煙囪等分布柔性參數(shù)體系的運動近似為單自由度建立運動方程，采用Rayleigh法并假設(shè)結(jié)構(gòu)形狀函數(shù)對分布柔度體系計算自振頻率是合理的；不同的結(jié)構(gòu)高度、筒徑尺寸對結(jié)構(gòu)水平和豎向振動動力特性影響顯著，結(jié)構(gòu)豎向振動周期短，接近高頻振動，與結(jié)構(gòu)的高度呈線性變化；隨著結(jié)構(gòu)高度的增加，結(jié)構(gòu)頂點位移呈逐漸增加趨勢，結(jié)構(gòu)達到位移幅值時，煙囪根部等效應(yīng)力隨著結(jié)構(gòu)高度的增加顯著增大。[關(guān)鍵詞] Rayleigh 法; 地震響應(yīng); 分布柔度參數(shù)體系; 等效應(yīng)力中圖分類號：TU 文獻標識碼：A 文章編號：1002-848X(2013)S2-0390-05Dynamic time-history analysis on stack-like structure under earthquake actionsLiu Jixiong1, Huang Jun1,2, Dai Shaobin2（1 School of Civil Engineering and Architecture of Wuhan University of Technology，Wuhan 430070, China; 2 Architecture Design &Research Institiue of Wuhan University of Technology, Wuhan 430070, China)Abstract: Through Rayleigh method, the vibration analysis of stack-like structure was conducted, using ANSYS to establish the finite element model of high chimney, the earthquake response of concrete chimney was studied under the combined effect of the horizontal and vertical earthquake. The results indicate that approximating the movement of chimney and other distributed flexible parameter system as a single degree of freedom to establish a motion equation, adopting Rayleigh method and assuming the structural shape function to calculate the natural frequency is reasonable. Different structure height and cylinder diameter have a significant impact on the dynamic characteristics of the horizontal and vertical vibration. Structural vertical cycle is short, close to the high -frequency vibration; it changes with height of the structure linearly. With the increase of the height of structure, vertex displacement increases gradually. When the displacement reaches the displacement amplitude, equivalent stress increases significantly.Keywords: Rayleigh method;earthquake response;distributed flexible parameter system
