奥氏体不锈钢筋与混凝土黏结性能试验及有限元分析

通过11组33个奥氏体不锈钢筋混凝土中心拉拔试验,研究钢筋直径、保护层厚度、锚固长度、混凝土强度及配箍率对试件破坏现象、黏结应力-滑移曲线、极限黏结强度的影响,并与1组3个普通碳素钢筋混凝土试件、1组3个铁素体不锈钢筋混凝土试件进行对比,分析3种类型钢筋与混凝土黏结性能的差异。基于试验数据,统计回归出奥氏体不锈钢筋与混凝土黏结强度的计算公式。运用ABAQUS有限元分析软件,对不同锚固长度拔出试件进行非线性有限元模拟分析,并将模拟结果与试验结果进行对比分析。结果表明:奥氏体不锈钢筋与混凝土的极限黏结强度要略低于普通碳素钢筋,但略好于铁素体不锈钢筋;荷载-位移曲线和极限荷载值与试验所得结果吻合较好。

Experimence and finite element analysis of bond behavior between austenitic stainless steel bars and concrete

Based on the 11 th group of 33 austenitic stainless steel reinforced concrete specimens pull-out tests,the influence of steel bar diameter,protective layer thickness,anchorage length,concrete strength and stirrup ratio on failure phenomena,bond stress-slip curves and ultimate bond strength of specimens are studied.Comparing with one group of three ordinary carbon reinforced concrete specimens and one group of three ferritic stainless steel reinforced concrete specimens,the differences of bond properties between three types of steel bars and concrete are analyzed.Based on the test data,the formula for calculating the bond strength between austenitic stainless steel bars and concrete is statistically regressed.Using ABAQUS finite element analysis software,the nonlinear finite element simulation analysis of pull-out specimens with different anchorage lengths was carried out,and the simulation results were compared with the experimental results.The results show that the ultimate bond strength between austenitic stainless steel bars and concrete is slightly lower than that of ordinary carbon steel bars,but slightly better than that of ferritic stainless steel bars.The load-displacement curves and ultimate load values agree well with the experimental results.