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对于烟囱这种高柔结构,按反应谱理论计算水平地震力,一般需要考虑三个振型,相当麻烦.我国的抗震规范除了规定振型分解法为一般计算法外,为了节约工程师的时间,还提出简化计算法.本文内容将包括下列两个方面.1.以振型分解法为准,本文首先论述美国加州1952年侧力规范最初提出、后来为很多国家规范采用的先计算基底剪力再分配于各高程处的办法以及略加修改订入我国1974年规范的计算法都将产生巨大的误差.2.提出两个误差远比上述二法为小、计算又非常方便的简化计算法,以供讨论.
For the chimney of this high-soft structure, according to the response spectrum theory to calculate the horizontal seismic force, the general need to consider the three mode shapes, quite troublesome. In addition to the provisions of the seismic code decomposition method for the general calculation method, in order to save the engineer’s time, This paper will include the following two aspects.According to the modal decomposition method, this paper first discusses the California side of the force specification first proposed in 1952, and later for many countries to adopt the standard calculation of the first base shear Redistribution to the elevation of the approach and slightly modified into the 1974 calculation method of our country will have a huge error.Second, two errors are much smaller than the above two methods, the calculation is very convenient to simplify the calculation method For discussion.