【摘要】 以大理河下承式简支钢管混凝土拱桥为背景,采用大型通用有限元计算软件Ansys建立全桥空间模型,沿全桥纵向取了7个典型断面,分析其在不同设计荷载工况下,T梁顶板的剪力滞效应,得出各典型截面上T梁顶板的剪力滞系数沿全桥横向、纵向的分布规律.指出跨中截面剪力滞后现象严重,剪力滞系数高达1.82;不同工况下其余截面的剪力滞效应较小;偏载作用下T梁顶板的剪力滞效应较对称荷载作用小.计算结果可为同类大桥设计提供参考.更多还原

【Abstract】 By taking a through concrete-filled steel-tubular arch bridge over Dali River as an engineering example,and using solid and beam element of Ansys,the shear lag effect of steel-tubular arch bridge is analyzed.Taking seven typical sections along longitudinal direction of overall bridge and investigating the shear lag effect of the top plate of T-type girder under different designed load conditions,the paper obtains the distribution rule of the shear lag coefficients of the main controlling cross-sections along transverse and longitudinal directions.The results show that the shear lag effect is serious in mid-span with maximum of 1.82 along longitudinal direction of overall bridge;the shear lag effect on the top plate of T-type girder at rest cross sections is relatively smaller under different designed load conditions.The result can provide a reference for design of the same type of bridge.更多还原