配栓钉的钢筋混凝土双向板受力性能试验研究

Experimental analysis on mechanical performances of reinforced concrete two-way slab with studs

为研究配置不同参数栓钉钢筋混凝土双向板的受力性能,完成了7块配置栓钉的双向板柱节点冲切试验,主要研究栓钉间距、直径、高度、强度和布置形式等参数变化对受力性能的影响,采用静力加载方式模拟配置栓钉的板柱节点破坏全过程。对比分析试验结果发现,增大栓钉直径、栓径高度或提高栓钉强度均能改善试件抗冲切性能,其中,增大直径效果最为明显,抗变形能力提高幅度达到36%;加大栓钉间距和减小栓钉高度对改善试件抗冲切性能不利,承载能力和抗变形能力均有不同程度降低;对比3种不同栓钉布置形式发现,采用相同数量栓钉放射布置和增加每圈栓钉数量的正交布置,均有利于提高试件抗冲切能力,但前者更经济。对比分析相关规范计算结果和试验结果发现,规范对配栓钉板柱结构的计算结果具有足够的安全储备,但对于反映试验结果的实质不够充分,特别是栓钉对板的抗冲切性能的贡献有所低估。

This paper aims to study the mechanical performances of reinforced concrete two-way slab with different stud parameters.The experimental study on seven reinforced concrete two-way slab-column connections with punching shear studs was conducted.The main parameters investigated were spacing of stud,the diameter of the stud,the height of the stud,the strength of the stud and the arrangement of the stud.The whole process of damage of slab-column connections with studs was simulated using static loading method.The results show that increasing the diameter of the stud,the height of the stud or the strength of the stud can improve the anti-punching shear performance of the specimen.The increase in diameter is the most obvious,and the decrease in deformation is up to 36%.Increasing stud spacing and reducing stud height weaken the load-bearing capacity and thus the deformation are increased.By comparing three different stud layouts,it is found that using radiation type contributes better to the improvement of the specimen anti-punching shear capacity,and the former was more economical.Then,the accuracy of the test results was verified by comparing the calculated results of relevant specifications with the test results.The results show that the safety reserve of specification calculation results of slabcolumn structure with studs is sufficient.However,it is not enough to reflect the nature of test results,especially contributions of the stud to anti-punching shear performance of slabs are underestimated.