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为研究钢混组合结构中剪力钉群的力学性能和破坏机理,设计并制作了6个群钉推出试验试件和2个群钉拉拔试验试件,8个试件均含有4排×2列共16枚22×200mm剪力钉,进行了推出试验和拉拔承载力试验。通过推出试验,研究分析了推出试件中剪力钉群的受力特性、荷载-滑移规律和破坏机理,并得出了16枚剪力钉的抗剪承载力。结果表明群钉平均极限抗剪承载力与文中作者所做的单枚22×200mm剪力钉推出试验所得到的极限抗剪承载力相比小了20%左右,有较大程度的折减。通过拉拔试验,得到了拉拔力与钢混界面脱开量实测曲线,结果表明试件均是由于混凝土剪切失效而宣告破坏,剪力钉群均未破坏,因此剪力钉在混凝土中需设置足够的锚固长度,防止剪力钉群在达到极限抗剪承载力之前被拉拔出混凝土块。
In order to study the mechanical properties and failure mechanism of shearing nail group in the steel-concrete composite structure, six groups of nail-launching test pieces and two group nail drawing test pieces were designed and manufactured. Each of the eight test pieces contained 4 rows × 2 columns of a total of 16 22 × 200mm shear nail, launched the test and pull-out capacity test. Through the introduction of the test, the force characteristics, load-slip law and failure mechanism of the shear nail group in the introduced specimens were studied, and the shear capacity of 16 shear nails was obtained. The results show that the average ultimate shear strength of group nails is about 20% less than the ultimate shear strength obtained from the single 22 × 200mm shear nails launched by the authors . Through the drawing test, the measured curve of the pulling force and the interface of the steel and concrete is obtained. The results show that the specimens are all declared as failure due to the failure of concrete shear, and none of the shear nail group is damaged. Therefore, the shear nail is in the concrete An adequate anchorage length shall be provided to prevent the shear nail pile from being pulled out of the concrete block before reaching the ultimate shear capacity.