摘要
为了研究钢纤维活性粉末混凝土(RPC)梁的抗剪性能,分析了钢纤维RPC梁斜截面裂缝间骨料咬合力和钢纤维拉拔阻力对平均拉应力的贡献比,通过对试验梁的受剪承载力结构试验,并充分考虑了钢纤维RPC和高强钢筋的本构关系,提出了基于修正压力场理论(MCFT)的弯剪复合应力下试验梁受剪承载力计算模型.利用作者及其他研究者的试验对该模型进行了验证,结果表明:对剪跨比为1.0~4.0的钢纤维RPC梁,所建模型的受剪承载力计算值与试验值吻合良好,验证了该方法有效性,可为钢纤维RPC梁的受剪承载力计算提供参考.
The contribution to average tensile stress from the aggregate interlock capacity on oblique section of steel fiber reactive powder concrete （RPC） beam across cracks and the pulling resistance of the steel fiber were analyzed to investigate the performance of RPC beam. The experiments of shear performance of test beams were conducted with a full consideration of constitutive relation between steel fiber RPC and high strength steel. And a shear capacity calculation model under bending shear stress based on the modified compression field theory （MCFT） was proposed. The module proposed is verified by the experiments of authors and other researchers. Results show that with the increase of stirrup ratio, the shear capacity increases correspondingly under the same shear-span ratio, when the stirrup ratio is larger than a certain value, and the increasing tendency of the shear capacity becomes slow and even a small decline. The value of the aggregate interlock capacity is much less than the pulling resistance of the steel fiber, and its contribution to the shear capacity can be ignored. The steel fiber~ s contribution to the shear capacity of RPC beam can not be ignored, and the stress strain curves are closest to the experimental data with the tensile strength correction factor of 0.75. The calculated results based on this model agree well with the experimental data under the shear span ratio of 1.0--4.0. The effectiveness of the proposed method was validated, and it provides references for the shear capacity calculation of steel fiber RPC beam.
出处
《河南大学学报（自然科学版）》
CAS
2018年第1期54-62,共9页
Journal of Henan University:Natural Science
基金
国家自然科学基金项目(51368013)
关键词
钢纤维
RPC
简支梁
修正压力场理论
受剪承载力
steel fibers
reactive powder concrete
simply supported beam
modified compression field theory
shear capacity
