宽墩窄塔独塔斜拉桥塔梁墩结合段设计与受力分析

为了解决柱式塔斜拉桥在塔柱横向尺寸受限情况下的塔梁墩结合段设计难题，以沪武高速公路罗埠河大桥为依托，通过理论分析和数值模拟的方法，对一种宽墩窄塔的塔梁墩结合段构造设计与受力性能进行研究。研究了宽墩窄塔的柱式塔与主梁结合段的合理构造及相应设计方法，并对这种新型构造进行了受力分析。结果表明，通过在结合段内设置合理的连接横梁和过渡构造，宽墩窄塔结合段可形成合理的构造形式，满足局部传力的要求；通过纵桥向设置刚度过渡段，增加主梁高度，配合横向弧形过渡结构，提高主梁和宽墩之间的刚度连接，使得主梁的内力可以直接传递至宽墩，降低对窄塔的影响；研究提出的宽墩窄塔塔梁墩结合段的传力可靠，应力传递平顺，应力状态均处于合理范围。形成的宽墩窄塔结合段构造形式及其设计方法可为类似在塔柱横桥向尺寸受限情况下的结合段设计提供参考。

Design and Stress Analysis on Pylon-girder-pier Combination Section of Wide-pier Narrow-pylon Cable-stayed Bridge

To solve the design problem of the pylon-girder-pier combination section of column-pylon cable-stayed bridge when the lateral dimension of the pylon column is limited, relying on Luobu River Bridge in Shanghai - Wuhan Expressway, the structural design and stress performance of the pylon-girder-pier combination section of a wide-pier narrow-pylon structure are studied through the theoretical analysis and numerical simulation. The reasonable structure and corresponding design method of the combination section of the column pylon and the main girder of the wide-pier narrow-pylon structure are studied, and the stress of this new structure is analyzed. The results show that the combination section of wide pier and narrow pylon can form a reasonable structure form by setting the reasonable connecting beams and transition structure in the connection section, which can meet the requirements of local force transmission. The rigidity transition section is set in the longitudinal direction of the bridge to increase the height of the main girder, cooperate with the transverse arc transition structure and improve the rigidity connection between the main girder and the wide pier in order to make the internal force of the main girder directly transmitted to the wide pier and to reduce the influence on the narrow pylon. The pylon-girder-pier combination section of wide pier and narrow pylon has the reliable force transmission and smooth stress transmission. The stress state is within a reasonable range. The structural form and design method of the formed wide-pier narrow-pylon combination section can provide the reference for the design of the similar combination sections when the transverse dimension of the pylon column is limited.