直接剪切型锚栓钢板加固混凝土梁的抗弯承载力试验研究

Experimental study on flexural capacity of concrete beams strengthened by direct-shear-bolted steel plate

首次提出了直接剪切型锚栓钢板加固体系的概念,其技术特征在于可以消除锚栓杆与钢板安装孔壁之间的间隙,最大限度保证群锚的协同受力。完成了4根钢筋混凝土试件抗弯承载力的对比试验。试验结果表明,所有加固试件的锚栓均未出现剪断现象,钢板受拉屈服,与对比试件相比受弯承载力提高120%,且加固试件具有良好的延性。

The concept of direct-shear-bolted steel plate strengthening system is initially proposed,in which the usually existed clearance between bolt shaft and the sidewall of hole on steel plate for installing anchors is eliminated,so that the compatibility of anchor group is secured to the extreme extent. A comparative test series of flexural capacity which consists of four reinforced concrete beam specimens was carried out. The test results show that bolts hadn＇ t been fractured for all strengthened specimens,tension steel plates had been yielded,flexural capacities of all strengthened specimens had been increased 120% compared with the contrast specimen,and excellent ductility for all strengthened specimens had been achieved.