砌体填充框架结构极限承载能力计算的一种新方法

为合理地评估砌体填充框架结构的极限承载能力,针对工程中常见的破坏模式,基于双参数统一强度理论提出了一种新型计算方法。该方法考虑了填充砌体与外围框架构件之间的剪应力、填充块材的单边效应及中间主应力效应、几何高宽比、框架构件与砌体相对强度等因素的影响。报道了砌体填充钢筋混凝土框架结构模型试验结果,理论计算值与试验数据吻合较好。最后,对文献建议的多种极限承载能力计算方法进行了分析与探讨。

A NEW CALCULATION METHOD FOR THE ULTIMATE LOAD-BEARING CAPACITY OF MASONRY-INFILLED FRAMES

In order to rationally evaluate the ultimate load-bearing capacity of masonry-infilled frames, a new method based on the two-parameter unified strength theory is proposed for the failure mode that usually appears in practice. This method takes into account the shear stress between the infilled masonry and the peripheral frame members, the tension-compression strength difference and the second principal stress of the masonry material, the geometric aspect ratio of structures, and the relative strength of the in filled masonry compared to frame members. Testing data of six laboratory models are presented. The results estimated with the proposed formulae are shown to agree favorably with testing results. Furthermore, several evaluation methods introduced in literatures for the ultimate load-bearing capacity of masonry-infilled frames are discussed.