基于修复性的砌体填充墙易损性研究

Reparability-based fragility analysis of masonry infills in buildings

历次地震灾害表明,填充墙的破坏会导致建筑使用功能的丧失和相当程度的经济损失。为了定量评估建筑物的地震损失,针对我国常见的空心砌块、实心砌块和黏土砖等砌体填充墙的修复性,定义了“简单修复”和“不易修复”两个损伤状态。搜集整理了我国填充墙抗震性能试验数据,以其中16个有代表性的、数据相对比较详细的砌体填充墙试件为样本,假设其工程需求参数服从对数正态分布,建立了不同类型砌体填充墙对应于不同损伤状态的易损性曲线,分析比较了砌体填充墙的破坏特征和变形能力。结果表明：在我国抗震规范规定的框架结构弹性层间位移角限值附近,实心和空心砌块填充墙很可能发生严重破坏,并达到“不易修复”状态。与空心和实心砌块填充墙相比,黏土砖填充墙具有更好的变形能力,但是与配筋砌体相比,其变形能力相对较差。

Abstract： The failure of in/ill walls occuring in previous earthquakes may suspend the occupancy of the building and lead to considerable economic loss. To provide basis for quantitative evaluation of building losses in earthquakes, two damage states, namely the ＇ simple repair＇ and ＇ substantial repair＇ states, are defined for masonry infills based on their reparability. From the existing experimental data of masonry infills of hollow blocks, solid concrete blocks and clay bricks in the literature, 16 specimens of typical materials and high-quality data were selected as samples to analyze the seismic fragility for different types of masonry infills at the aforementioned damage states by taking the form of lognormal cumulative distribution functions. The results show that the masonry in/ills of either hollow or solid concrete blocks are likely to sustain significant damage and reach the ＇ substantial repair＇ limit state even if the hosting moment frame just reaches the elastic inter-story drift limit as per the Chinese seismic design code. The deformability of unrein/oreed clay brick in/ills is much larger than that of hollow or solid concrete block in/ills, but is inferior to reinforced ones.