基于试验数据的填充墙RC框架性能指标限值研究

Performance Level Limits of Infilled RC Frames Based on Test Database

为了建立我国砌体填充墙RC框架结构性能水准与性能指标间的对应关系,通过收集整理国内填充墙RC框架拟静力试验数据,建立了本土化填充墙RC框架试件试验数据库。参考《建(构)筑物地震破坏等级划分》(GB/T24335-2009),定义了填充墙RC框架的5个性能水准及其破坏状态描述,根据试验现象提取试件首次达到每个性能水准时的层间位移角作为样本,通过统计分析,分别给出刚性连接和柔性连接填充墙RC框架具有84%保证率的层间位移角限值,并与《建筑抗震设计规范》(GB 50011-2010)和现有研究中给出的限值进行对比,最后进一步分析了采用不同类型砌块的填充墙RC框架结构性能水准限值的差异。结果表明,相较于规范限值,刚性连接的填充墙RC框架限值在轻微破坏和中等破坏的性能水准下均偏小,而在严重破坏的性能水准下远大于规范限值;相较于现有限值,作者研究得出的限值具有性能水准判定标准统一、数据更符合我国国情的特点;相较于传统的黏土砖和普通混凝土砌块,采用加气混凝土砌块砌筑填充墙的RC框架结构侧向变形能力更好。

In order to obtain the correspondence between the performance levels and performance of in-filled RC frame structures in China,a localized test database of infilled RC frame specimens was estab-lished by collecting the domestic pseudo-static tests on infilled RC frames.Five performance levels of infilled RC frames and their damage state descriptions were defined with reference to GB/T 24335-2009,′Classification of earthquake damage to buildings and special structures′.The IDRs(Inter-story Drift Ratios)of specimens first reaching each performance level were extracted according to the test phenomena,and the IDR limits for the performance levels of rigidly-connected and flexibly-connected infilled frames with an 84%guarantee rate were given through statistical analysis.The limits were compared with those given in the GB 50011-2010,′Code for Seismic Design of Buildings,′and exist-ing studies.Finally,the differences in the performance level limits of RC frames,infilled with various types of blocks,were further analyzed.The results show that compared with the code limits,the lim-its of rigidly-connected RC frames with infilled walls in this paper are lower for the performance levels of slight and moderate damage,but much larger than the code limits for the performance levels of se-vere damage;compared with the existing limits,the limits in this paper have the characteristics of uni-fied criteria for determining the performance levels and the data are more in line with the domestic con-ditions;compared with traditional clay bricks and common concrete blocks,the lateral deformation ca-pacity of RC frames infilled with aerated concrete blocks is better.