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以高墩大跨空腹式连续刚构桥为研究对象,基于结构稳定性理论,采用有限元方法,分析了双薄壁墩双肢间距、内外壁坡度及薄壁连接墙设置高度的变化对桥梁结构稳定性的影响。研究结果表明:斜腿施工最大悬臂状态的稳定性好于主梁施工最大悬臂状态的稳定性;双薄壁墩双肢间距对纵桥向失稳模态有一定影响,而对横桥向失稳模态的影响很小;墩身外壁坡度对横桥向、纵桥向失稳模态影响较大,而墩身内壁外壁坡度对横桥向、纵桥向失稳模态影响较小;外壁坡度较小时,结构外荷载对失稳模态影响较大,外壁坡度较大时,结构自重对结构稳定性占主导地位;双薄壁连接墙主要影响纵桥向失稳模态。
Based on the theory of structural stability, the finite element method is used to analyze the influence of the bridge between the double-thin pier, such as the distance between the two limbs, the gradient of the inner and outer walls and the height of the thin-walled contiguous wall Effect of structural stability. The results show that the stability of the maximum cantilever construction in inclined leg construction is better than the stability of the maximum cantilever construction in the main girder construction. The distance between the two limbs of double-walled piers has some influence on the longitudinal bridge destabilization mode, The influence of steady modal is small; the outer wall slope of pier body has a great influence on the transverse and longitudinal bridge instability modes, while the outer wall slope of pier inner wall has less influence on the transverse bridge and longitudinal bridge instability modes; When the external wall slope is small, the load outside the structure has a great influence on the instability mode. When the external wall slope is larger, the structural self-weight dominates the structural stability; the double-thin wall mainly affects the longitudinal bridge instability mode.