摘要
运用有限元软件 SAP2000对某钢结构气象塔进行了动力特性分析和罕遇地震作用下考虑 P-△效应的动力时程分析,得到了该气象塔的时程位移、时程速度和时程加速度响应。分析表明:利用《建筑结构荷载规范》中的经验公式来估计质量和刚度分布不均匀的高耸塔式结构的自振周期误差较大;在罕遇地震作用下,气象塔顶部桅杆的"鞭梢效应"非常明显,中、下塔楼部位存在质量集中和刚度突变,属于薄弱部位,因此建议在桅杆和塔楼处采取必要的耗能减震措施。
In virtue of the finite element software SAP2000,the dynamic character and nonlinear time-history analysis for a steel meteorological tower under seldom occurred earthquake were conducted to obtain the time history displacement ,time history velocity and time history acceleration. The analysis had shown that the error to predict the natural period of high-rise tower with the empirical formula in the load code of building structures is comparatively large ; and the whipping effect of the backstay on the top of the tower is very obvious and the several weaknesses occur because of the mass concentration and the stiffness mutation of the tower platforms. So some earthquake mitigations were suggested ,which can be taken in the backstay and those tower platform.
出处
《结构工程师》
2009年第6期79-83,共5页
Structural Engineers
关键词
动力特性
罕遇地震
动力时程分析
自振周期
鞭梢效应
dynamic character, seldom occurred earthquake, dynamic time-history analysis, natural period,whipping effect
