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文章通过5个带栓钉连接件的型钢活性粉末混凝土(reactive powder concrete,RPC)短柱在单调荷载下的推出试验及1个自然黏结试件的对比试验,研究了带栓钉连接件的型钢RPC短柱的破坏形态、荷载滑移曲线、型钢应变曲线及抗剪承载力等。试验结果表明:带栓钉连接件的型钢RPC推出试件的破坏以RPC劈裂为主,和普通型钢混凝土试件的荷载-滑移曲线一样,大致可分为5个阶段,分别为无滑移段、滑移段、破坏段、荷载下降段及残余段;应力-应变曲线也和普通型钢混凝土相似,在荷载较小时,型钢应变曲线成指数形式,在荷载较大时,由于栓钉剪切变形的影响,栓钉根部混凝土受局部承压作用,近栓钉位置的型钢应变会产生突变。基于试验结果,以非线性断裂力学思想为基础,通过断裂能推出计算试件黏结锚固承载力的公式。计算结果表明,与试验结果相比较,公式计算结果较为保守,可用于工程实际。
In this paper, through the push-out test of five short posts of reactive powder concrete (RPC) with peg-joints on monotonic loading and the comparison test of one natural bonded specimen, RPC short column damage morphology, load slip curve, steel strain curve and shear bearing capacity. The test results show that the failure of the RPC with splints is mainly caused by RPC splitting. Like the load-slip curve of ordinary steel concrete specimens, it can be divided into five stages, which are non-slip The displacement curve, the slip segment, the destructive segment, the descending segment and the residual segment of the load. The stress-strain curve is also similar to the common type steel concrete. When the load is small, the strain curve of the profile steel is in an exponential form. When the load is large, The effect of shear deformation is that the concrete at the root of the peg is under partial pressure and the deformation of the steel near the peg will be abrupt. Based on the test results, based on the theory of nonlinear fracture mechanics, the formula for calculating the load-bearing capacity of specimens by fracture can be deduced. The calculation results show that, compared with the test results, the formula calculation results are more conservative and can be used in engineering practice.