新老混凝土粘结界面的抗剪性能研究

摘要

A experiment study on 8 different groups of 16 Z-shape specimens was conducted in this paper. Here, the influences of different planting rates and arrangements of reinforcement on the shear behavior have been investigated. Test results have shown that: the reinforcement behavior and shear strength of the concrete were improved with the increase of planting rates. The cracking load and ultimate load of specimens with triangular arrangement are greater than these square arranged ones. According to the test results, choosing triangular arranged reinforcement is more reasonable when repairing and strengthening structures.%对8组16个Z形构件进行剪切试验,研究植筋率和所植钢筋排列方式对新老混凝土粘结界面抗剪性能的影响,结果表明在一定范围内增大植筋率可使钢筋性能得到充分发挥,从而提高混凝土构件的抗剪性能;采用三角形植筋排列方式的试件,其开裂荷载和破坏荷载均高于方形排布试件,所植钢筋的应变也相对均匀.在新老混凝土构件的实际维修加固中,应优先考虑三角形植筋排布方式.