500MPa级钢筋在受侧压混凝土中的锚固性能试验研究

Experimental study on anchorage performance of 500MPa rebar in concrete under lateral pressure

进行了23组69个受侧压混凝土中心置筋锚固拉拔试件试验,锚筋采用HRB500高强钢筋,研究了不同侧压比对试件锚固性能的影响。试验结果表明,在侧压比为0.4以下时,随侧压比增大,极限锚固强度整体呈线性增大趋势;侧压比为0.4～1.0时,极限锚固强度值随侧压比增大基本维持不变。通过研究进一步提出受侧压情况下钢筋的锚固长度设计建议。

Axial pull-out tests of 69 concrete specimens under lateral pressure are carried out.The specimens are reinforced with HRB500 steel bars.The influence of different lateral pressure ratio on bond-anchorage performance is investigated.The test results indicate that:when the lateral pressure ratio is under 0.4,the maximum anchorage strength grows linearly with the increase of lateral pressure ratio;when the lateral pressure ratio is between 0.4~1.0,the maximum anchorage strength maintains stable with the increase of lateral pressure ratio.Design recommendation for anchorage length of steel bar under lateral pressure is proposed.