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采用致密化方法对普通“应变硬化水泥基复合材料(SHCC)”进行改进得到的“致密应变硬化水泥基复合材料(DSHCC)”具有更高的抗压、抗拉强度和弹性模量。已有研究证明DSHCC比SHCC具有更加优异的抗弯加固性能。基于RC梁抗剪原理,抗拉强度较高的DSHCC对加固梁抗剪性能也将非常有利。为此,对剪跨比分别为3.2和2.2两组共6根试验梁进行试验研究。对比分析加固梁和RC基准梁剪切破坏模式、承载力、变形能力以及裂缝分布等方面的不同;结合有限元和桁-拱理论分析,推导斜截面极限承载简化计算公式,并用试验结果验证该简化公式的可靠性。研究成果将为DSHCC材料及其在桥梁加固方面的工程应用和推广提供理论依据和参考。
The “Densified Strain Curing Cementitious Composites (DSHCC)” obtained by densification method to improve common “Strain Cured Cementitious Composites (SHCC)” has higher compressive strength, tensile strength and elastic modulus the amount. It has been proved that DSHCC has more excellent flexural strength than SHCC. Based on the principle of shear strength of RC beams, DSHCC with higher tensile strength will also be very beneficial to the shear behavior of reinforced beams. To this end, the shear span ratio of 3.2 and 2.2, respectively, two groups of two experimental beams for experimental study. The differences of shear failure mode, bearing capacity, deformation capacity and fracture distribution between reinforced beam and RC reference beam are compared and analyzed. Based on the finite element analysis and the truss-arch theory, the simplified calculation formula of the ultimate bearing capacity of inclined section is deduced and verified by the test results Simplify the reliability of the formula. The research results will provide theoretical basis and references for DSHCC materials and their applications in engineering and promotion of bridges.