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本文研究了无筋砖烟囱的地震破坏形式,并进行了反应的数值分折,特别着重水平与竖向振动的相对重要性。文中假定地震应力与自重应力综合后的最大拉应力一旦达到或超过容许拉应力,烟囱的整个截面即裂开。在选择几个合理的地震动加速度过程之后,计算了一些典型的无筋砖烟囱的地震反应;在计算中,当某一截面断裂后,即考虑断了的烟囱上部为刚体,继续计算到地震终了,再发生第二道裂缝,或上部倾倒时为止。根据这些计算,得到的结论是:在一般情况下,水平振动是无筋砖烟囱破坏的主要原因,只是在特殊情况,竖向振动才可能起同等重要的作用。
In this paper, we study the seismic failure mode of the ribless brick chimney, and conduct numerical analysis of the reaction, with particular emphasis on the relative importance of horizontal and vertical vibration. It is assumed that the maximum tensile stress after the combination of seismic stress and self-contained stress reaches or exceeds the allowable tensile stress, and the entire cross-section of the chimney is cracked. After selecting a few reasonable seismic acceleration processes, the seismic response of some typical reinforced brick-free chimneys is calculated. When the fracture of a certain section is considered, the upper part of the chimney considered to be broken is rigid body, and the earthquake is continuously calculated Finally, the second crack occurs again, or the upper part of the dumping date. Based on these calculations, it is concluded that, in general, horizontal vibration is the main cause of failure of a ribless brick chimney, except that vertical vibration may play an equally important role in exceptional circumstances.