| 小开洞砌体墙抗震性能研究 |
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| 引用本文： | 李 超,郭 猛.小开洞砌体墙抗震性能研究[J].建筑科学与工程学报,2023,0(3):92-101. |
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| 作者姓名： | 李 超 郭 猛 |
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| 作者单位： | (中国建筑科学研究院有限公司,北京 100013) |
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| 摘 要： | 为研究小开洞砌体墙的抗震性能,设计了3片小开洞砌体墙试件和1片无洞口砌体墙试件,并进行了低周往复加载试验; 介绍了砌体墙试件的主要破坏过程及破坏机理,对比分析了各片砌体墙承载力、抗侧刚度及延性等抗震性能差异; 基于试验建立有限元模型,研究了开洞率及洞口位置对砌体墙抗震性能的影响。结果表明:小开洞砌体墙破坏机理较实体墙发生了显著改变,无洞口墙表现为明显的转动破坏特征,小开洞墙主要表现为典型的脆性剪切破坏; 开单个小洞口会削弱砌体墙的水平承载力和抗侧刚度,大幅降低墙体的延性; 增加洞口数量或高度可适当提高小开洞砌体墙的抗震性能; 随着开洞率的增大,墙体承载力和初始刚度逐渐下降,延性性能表现为先降低后提高的趋势; 竖直方向上,洞口越往下,墙体抗震性能越差,水平方向上,洞口宜居中布置。
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| 关 键 词： | 砌体结构 砌体墙 小开洞 低周反复荷载试验 有限元分析 抗震性能 |
Investigation on seismic behavior of masonry walls with small openings |
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| LI Chao,GUO Meng.Investigation on seismic behavior of masonry walls with small openings[J].Journal of Architecture and Civil Engineering,2023,0(3):92-101. |
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| Authors: | LI Chao GUO Meng |
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| Affiliation: | (China Academy of Building Research, Beijing 100013, China) |
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| Abstract: | In order to study the seismic performance of masonry walls with small openings, three masonry walls with different small openings and a masonry wall without opening were designed for low cycle cyclic loading test. The main failure process and failure mechanism of masonry wall specimens were introduced, and the differences of seismic performance such as bearing capacity, lateral stiffness and ductility of each wall were compared and analyzed. In addition, based on the test, finite element models were established to study the effects of opening rate and opening location on the seismic performance of masonry walls. The results show that the failure mechanism of masonry walls with small openings have changed significantly compared with the masonry wall without opening. The wall without opening shows obvious rotational failure characteristics, but walls with small openings mainly show typical brittle shear failure. A single small opening will weaken the horizontal bearing capacity and lateral stiffness of the masonry wall, and greatly reduce the ductility of the wall. Increasing the number or height of openings can appropriately improve the seismic performance of the masonry wall with small opening. With the increase of opening rate, the bearing capacity and initial stiffness of the wall gradually decrease, and the ductility first decreases and then increases. In the vertical direction, the lower the opening, the worse the seismic performance of the wall. In the horizontal direction, the opening should be arranged in the middle. |
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| Keywords: | masonry structure masonry wall small opening low cycle cyclic loading test finite element analysis seismic performance |
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