Strength capacity of unreinforced masonry cylindrical columns under seismic transverse forces
Strength capacity of unreinforced masonry cylindrical columns under seismic transverse forces
复制标题
地震横向力作用下无筋砌体圆柱柱的强度承载力
DOI：
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发表时间：
2012
影响因子：
4.6
通讯作者：
F. Çili
中科院分区：
文献类型：
--
作者：
M. Gurel;R. K. Pekgokgoz;F. Çili
本文采用等效静力分析方法对无筋砌体圆柱柱的抗震性能进行了研究。为此，利用已有的矩形截面砌体单元稳定性分析数值模型，对圆柱柱进行了修正。在考虑截面开裂和二阶效应的数值模型中，柱被理想地划分为足够多的单元，每个单元具有均匀的曲率。柱被建模为承受自身重量、偏心垂直荷载和相当于惯性作用的分布和集中静态水平荷载的棱镜悬臂梁。通过对参考柱和实际建筑柱两个实例的分析，得到了横向地震系数与顶漂水平的关系曲线。在这些曲线的基础上，解释了柱的侧向荷载行为，并确定了每根柱可以抵抗的最大地震荷载值。对参考柱进行参数化分析，确定了其抗震性能对柱长细、竖向顶荷载大小、偏心距等参数的敏感性及柔度参数。文中还讨论了竖向偏差等结构缺陷对结构抗震性能的影响。
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.