Simulating the shear process of steel-Ultra-High Performance Concrete(UHPC)composite beams based on the finite element software is an important mean to master their shear performance.Adopting the constitutive relation of the UHPC,a nonlinear finite element model of steel-UHPC composite beams is established.The shear performance and failure mode of the beams under different shear span ratios are analyzed.Based on the basic parameter of a steel-UHPC composite beam with a shear span ratio(λ)of 1.14,the thickness of the UHPC flange,the ratio of web height to thickness,the ratio of flange width to thickness,and the spacing of stiffeners are analyzed.The results indicate that the failure modes of steel-UHPC composite beams with different shear span ratios until reaching the ultimate bearing capacity.As the shear span ratio decreases,the shear failure mode of steel-UHPC composite beams becomes more pronounced,resulting in significant improvements in shear stiffness,web shear buckling load,and shear ultimate bearing capacity.The increase of UHPC flange thickness and decrease of the web height-to-thickness ratio lead to the most substantial increase in shear ultimate bearing capacity.Moreover,with reduce of the spacing of stiffeners and decrease of the ratio of flange width to thickness,the shear ultimate bearing capacity decreases gradually.
关键词
钢-UHPC组合梁/抗剪性能/剪切屈曲/非线性有限元分析
Key words
steel-UHPC composite beam/shearing performance/shear buckling/nonlinear finite element analysis
维普
万方数据