【摘要】 采用有限元法和求解特征方程法分别对某乙烯生产钢塔架进行动力特性分析,得到结构的基本频率,通过比较发现两者的计算结果较接近,从而验证采用有限元软件建立的模型的正确性。进而,采用有限元软件对乙烯生产钢塔架进行两个方向的地震响应分析,同时研究有重力和阻尼对结构地震响应的影响。结果表明:①结构侧移刚度小的方向,结构的响应较大,但各层的层间弹性位移转角最大值都满足《建筑抗震设计规范》给定的限值;②重力会增大结构的位移响应,但是对结构的速度及加速度响应没有影响;③阻尼会大幅度降低结构的位移、速度、加速度响应,因此,增大结构的阻尼对结构抗震十分有利。更多还原

【Abstract】 The dynamic characteristics of ethylene production steel tower are analyzed by the finite element method and the solving characteristic equation method respectively,and the fundamental frequency of the structure is obtained.The calculation results are close to both through the comparison,thus the correctness of the model based on the finite element software are verified.And then two directions earthquake response analysis of ethylene production steel tower are taken by the finite element software.Meanwhile,the effect of gravity and damping on earthquake response of the structure is researched.The results show that: ① the response of the structure is larger in the direction of small structure lateral stiffness,but the maximum value of layers elastic displacement angle between layers satisfy the given limits in the requirements of Chinese "code of building seismic design";② gravity will increase the displacement response of the structure,but it has no effect on speed and acceleration response of the structure;③ damping will reduce structural displacement,velocity and acceleration response greatly,therefore,increasing the structure damping is more beneficial to the structural seismic.更多还原