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对直径20 mm的HRB500和HRB600高强钢筋进行一系列拉压往复荷载试验。考察不同长细比的两种高强钢筋在荷载幅值逐渐增大的往复荷载下的性能变化规律。试验结果表明:往复荷载下,HRB500和HRB600高强钢筋所能达到的最大应力和破坏前最大应变幅值均随试件长度的增加而减小;在拉压两个方向上,应力都随试验段长度增加而下降,且降幅逐渐加大。但由于屈曲效应的存在,受压方向更加明显。试验中HRB500钢筋表现出了较好的延性,但HRB600钢筋的所有试件都表现出脆性破坏特征,应该引起重视。
A series of tension-compression reciprocating tests were carried out on HRB500 and HRB600 high-strength steel bars with a diameter of 20 mm. The behavior of two kinds of high-strength steel bars with different slenderness ratios under cyclic load was investigated. The experimental results show that the maximum stress and the maximum strain amplitude before HRB500 and HRB600 can decrease with the increase of the specimen length under the reciprocating load. In the both directions of tension and compression, Length increases and decreases, and the decline gradually increased. But due to the existence of buckling effect, the pressure direction is more obvious. HRB500 rebar showed good ductility in the test, but all the specimens of HRB600 rebar showed brittle failure characteristics, which should be taken seriously.