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采用拉应变可达3%～5%、极限受拉破坏时平均裂缝间距和平均裂缝宽度仅为1～2mm和60～100μm的超高韧性水泥基复合材料(UHTCC)替换普通钢筋混凝土梁受拉区的部分混凝土材料,可提高结构的耐久性。针对该类UHTCC/RC复合梁,在假定UHTCC和混凝土之间界面粘结很好和平截面假设成立的前提下,根据平衡方程给出了其整个受力过程中考虑UHTCC起裂后拉应力增加部分影响的弯曲承载力理论解析公式,结合所完成的12个UHTCC/RC复合梁弯曲试验结果,进行了对比。结果表明,理论解析公式和UHTCC按理想弹塑性受拉模型推导的理论简化公式计算值比较接近,最大误差不超过10%。本文提出的正截面承载力计算方法可为该类复合梁的承载力设计提供参考。
The tensile strain of up to 3% to 5%, the ultimate tensile failure and the average crack spacing and the average crack width of only 1 ~ 2mm and 60 ~ 100μm of ultra-high toughness cement-based composite material (UHTCC) replacement of ordinary reinforced concrete beam tension Part of the concrete area, can improve the durability of the structure. For the UHTCC / RC composite beams of this type, given the good interfacial bonding between UHTCC and concrete and the assumption of the cross section, the increase of tensile stress after UHTCC initiation is given according to the equilibrium equation The theoretical analysis formula of flexural bearing capacity of the UHTCC / RC composite beam is compared with the bending test results of 12 UHTCC / RC composite beams. The results show that the theoretic analytical formula is close to the theoretical simplified formula deduced by UHTCC according to the ideal elastoplastic tension model, and the maximum error is less than 10%. The proposed method for calculating the bearing capacity of normal section can provide references for the design of bearing capacity of composite beams.