偏载下板柱结构中柱节点破坏试验研究

采用重剪比以及配筋率两个试验变量对4个板柱中节点的破坏过程进行了对比试验，并在试验过程中采用特制应变测杆对试件内部斜裂缝的形成和发展予以监测。试验结果表明：试件最终破坏形态受重剪比和配筋率两因素共同影响；重剪比相同的试件，配筋率的提高也可有效提高中柱节点对不平衡弯矩的承载力；板内斜裂缝在节点发生冲切破坏之前已产生，并从靠近柱头的受压区向板底受拉区开展。基于试验结果和历史试验数据，将中国规范 GB 50010—2010所采用的基于偏心剪应力模型的计算方法和欧洲规范 Eurocode2-04进行对比，分析了偏心剪应力模型不足的原因。

Experimental analysis of eccentrically loaded RC interior slab-column connections

Gravity shear ratio and slab reinforcement ratio were adopted as the two test variables of competitive experiment to study the failure process of interior slab-column connections by means of 4 specimens.The formation and development of inner shear crack were monitored by using a special strain measuring rod during the experiment.The test results showed that the failure pattern of specimens was related to both gravity shear ratio and slab reinforcement ratio;unbalanced moment bearing capacity of the same gravity shear ratio specimens could be improved effectively by increasing reinforcement ratio;the inner shear crack had been generated before punching shear failure happened,and developed from the compression zone nearing the column to the tension zone locating at the bottom of slab.Based on the results in this study and current test data,the calculation method based on eccentric shear stress model which was adopted by GB50010—2010 was compared with the one used by Eurocode2-04,and the reasons for the shortcomings of eccentric shear stress model were analyzed.