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首页> 外文期刊>Bulletin of Earthquake Engineering >Strength capacity of unreinforced masonry cylindrical columns under seismic transverse forces
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Strength capacity of unreinforced masonry cylindrical columns under seismic transverse forces

机译：横向地震作用下无筋砌体圆柱的承受力

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摘要

In this paper, the seismic resistance of unreinforced masonry (URM) cylindrical columns is investigated with an equivalent static analysis procedure. To this end, an existing numerical model developed for the stability analysis of masonry elements with rectangular cross-section is utilized and modified for the cylindrical columns. In the numerical model which takes into account the cracking of the sections and the second-order effects, the columns are divided ideally into sufficiently high number of elements, each having uniform curvature. The columns are modeled as prismatic cantilevers undergoing their own weights, eccentric vertical loads and distributed and concentrated static horizontal loads equivalent to the inertia actions. By considering two examples of columns, firstly a reference column and secondly a column from a real building, lateral seismic coefficient versus top drift level curves are obtained. On the basis of these curves, lateral load behavior of the columns is interpreted and maximum seismic load values which can be resisted by each column are determined. Implementing parametric analyses on the reference column, sensitivity of the seismic resistance to parameters such as column slenderness, magnitude and eccentricity of vertical top load, and the flexibility parameter is determined. The influence of some structural imperfections such as the deviation from vertical on the seismic resistance is also discussed in the paper.
机译：本文采用等效静力分析方法研究了无筋砌体（URM）圆柱柱的抗震性能。为此，利用现有的数值模型开发了矩形截面的砌体元素的稳定性分析，并对圆柱柱进行了修改。在考虑了截面开裂和二次效应的数值模型中，理想情况下，将列划分为足够多的元素，每个元素具有均匀的曲率。这些柱被建模为具有自身重量，偏心垂直载荷以及等效于惯性作用的分布集中静水平载荷的棱形悬臂。通过考虑两个列示例，首先是参考列，其次是来自真实建筑物的列，从而获得了横向地震系数与顶部漂移水平的曲线。根据这些曲线，可以解释柱的横向荷载行为，并确定每个柱可以抵抗的最大地震荷载值。在参考柱上进行参数分析，确定抗震性对诸如柱长，竖向最大荷载的大小和偏心率等参数的敏感性以及柔度参数。本文还讨论了一些结构缺陷，例如垂直偏移对抗震性的影响。

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