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根据7个小跨高比钢板-混凝土组合连梁试件的应变量测数据,研究了纵筋、箍筋和钢板在不同转角位移下的应变分布,定量分析了不同工作阶段连梁中钢板承担的剪力,并采用ABAQUS软件对组合连梁试件的抗震性能进行了非线性有限元分析。结果表明:钢板承担的剪力占连梁总剪力的百分比随连梁弦转角的增大而逐渐增大;小跨高比组合连梁剪切变形和总侧移量并不成固定比例增长;随着加载位移的增加,连梁剪切变形所占比例逐渐增大,各试件达到屈服荷载以后,剪切变形已超过总变形的50%以上。采用混凝土应力-裂缝宽度关系来考虑混凝土受拉软化性能,能较好地进行小跨高比组合连梁的弹塑性有限元分析。钢板沿梁跨度方向全跨轴向受拉,拉力分布呈M形分布,随着钢板厚度的增大,M形的峰值点拉力逐渐增大,在梁跨内钢板拉力较小,最小仅约为其峰值拉力的20%;跨高比、截面配钢率、纵筋配筋率、混凝土抗压强度和楼板作用是影响组合连梁抗震性能的主要因素。
According to the strain measurement data of seven small-span steel-concrete composite beam specimens, the strain distribution of the longitudinal reinforcement, stirrup and steel plate under different angular displacements was studied. The steel plate burden in the joint beams was quantitatively analyzed in different work stages The shear strength of the composite beam specimens with ABAQUS software was analyzed by nonlinear finite element method. The results show that the percentage of total shear stress of steel beams increases with the increase of the twisting angle of the continuous beams. The shear deformation and total lateral displacement of the composite beams with small span ratio are not increasing in a fixed proportion. With the increase of loading displacement, the proportion of shear deformation of the connecting beam gradually increases. After the yield load of each specimen reaches, the shear deformation has exceeded 50% of the total deformation. The tension-softening performance of concrete is considered by the relationship between stress and crack width of concrete, and the elasto-plastic finite element analysis of the composite beam with small span ratio can be well performed. Along the beam span direction, the steel plate is stretched across the shaft in an axial direction and the distribution of tensile force is M-shaped. With the increase of the thickness of the steel plate, the tensile force at the peak point of M-shape gradually increases. The peak tensile force of 20%; span ratio, steel ratio with section, longitudinal reinforcement ratio, compressive strength of concrete and the role of the floor is the main factor affecting the seismic performance of composite beams.