超高性能混凝土对简支梁抗剪性能影响的模拟

Simulation of the effect of ultra-high performance concrete on the shear performance of simply supported beams

为研究超高性能混凝土对混凝土简支梁抗剪性能的影响,利用ANSYS软件建立剪弯段填充UHPC的混凝土简支梁力学模型,分析剪弯段填充不同UHPC长度时对混凝土简支梁抗剪承载力和破坏类型的影响情况.结果表明,剪弯段填充UHPC可以有效提升简支梁的抗剪承载能力.随着UHPC填充长度的不断提高,简支梁的抗剪承载力不断提高,全梁均为UHPC时达到峰值.发生破坏时,普通混凝土简支梁,全UHPC简支梁,剪弯段UHPC填充长度占梁长20%,40%及60%UHPC的简支梁呈剪压破;剪弯段UHPC填充长度占梁长80%的简支梁呈超筋弯曲破坏.

In order to study the effect of super high performance concrete filled in shear bending section on the shear performance of concrete simply supported beams,the mechanical model of concrete simply supported beam filled with UHPC in shear-bending section was established by finite element software ANSYS,the influence of different UHPC lengths on the shear capacity and failure type of concrete simply supported beams was analyzed.The results show that UHPC filling in the shear-bending section of the simply supported beam can greatly improve the shear bearing capacity of the simply supported beam.With the continuous improvement of the filling length of UHPC,the shear capacity of simply supported beams will increase continuously,and the peak value is reached when the whole beam is UHPC.When failure occurs,ordinary concrete simply supported beams,full UHPC simply supported beams,shear-bending section of UHPC filling length accounted for 20%of the beam length,40%and 60%of UHPC simply supported beams showed shear crushing;the simply supported beam with UHPC filling length of 80%of the beam length in the shear-bending section shows super-reinforced bending failure.