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通过2个大比例T形边柱的板柱连接试件(其中1个试件配置抗冲切锚栓)在竖向荷载和低周反复水平荷载作用下的试验,探讨了T形边柱的板柱连接在模拟地震作用下的裂缝形态、破坏特征、混凝土以及钢筋的应变、滞回特性、位移延性等一系列受力特性。试验研究表明,T形边柱的板柱连接与传统方形边柱的板柱连接除破坏形态有所差异外,其受力性能基本类似,2个试件的极限侧移比都远超过了1.5%的侧移比限值要求,因此在板柱结构中引入T形边柱是可行的;配置抗冲切锚栓可以显著地提高T形边柱的板柱连接的承载能力和延性。此外,根据试验给出了T形边柱的冲切临界面形式,并提出了其类似极惯性矩的计算公式,从而使T形边柱的板柱连接可以应用现行规范的方法进行承载力分析计算,采用该方法的理论分析结果与试验结果符合较好。
Through the test of two large-scale T-shaped columns with column connection specimens (one of which is equipped with punching anchor) under vertical load and low-cycle repeated horizontal load, The fracture shape, failure characteristics, strain, hysteretic property and displacement ductility of concrete and steel bar are connected with a series of stress characteristics under the action of simulated earthquakes. Experimental results show that except for the failure modes, the plate-column connections of T-shaped side columns are similar to those of the traditional square side columns, and the ultimate lateral displacement ratios of the two specimens are far more than 1.5 % Of the lateral shift than the limit requirements, so the introduction of T columns in the column structure is feasible; the configuration of punching bolt can significantly improve the T-side column plate column connection carrying capacity and ductility. In addition, the punching interface of T-shaped side column is given according to the experiment, and the calculation formula of the similar polar moment of inertia is given, so that the column-column connection of T-shaped side column can be applied to the analysis of bearing capacity Calculated, the theoretical analysis results using this method are in good agreement with the experimental results.