摘要
为优化三塔结合梁斜拉桥的受力和变形状态,以武汉二七长江大桥主桥设计为依托,采用有限元软件SCDS,从拉索布置、塔梁支承方式、桥塔刚度、主梁形式的选择及混合梁结合面位置的确定5个方面对该桥结构方案进行研究、比选。研究结果表明:加大中塔刚度是改善结构整体刚度的理想方式;中塔塔、梁固结,边塔竖向支承体系优于其他塔、梁支承体系;在边塔竖向支承的前提下,中塔与梁部铰接比完全固结优越;桥塔处主梁竖向采用支座支承的方式较优;混合梁结合面应选择在该截面弯矩影响线与基线围成的面积尽可能小的地方。
To optimize the mechanical behavior and deformation status of the three-pylon composite girder cable-stayed bridge for the main bridge of Wuhan Erqi Changjiang River Bridge,the finite element software SCDS was used to research and compare the structural system schemes for the bridge from five aspects of the arrangement of stay cables,supporting ways of pylons and girder,rigidity of the pylons,selection of main girder type and determination of hybrid girder connection interface locations.The results of the research show that the increase of the rigidity of the intermediate pylon is an ideal way to improve the global rigidity of the structure,the rigid fixity of the pylon with the girder and the vertical supporting systems of the side pylons are superior to other supporting systems of the pylons and girders.Under the condition that the side pylons are vertically supported,the articulated connection of the intermediate pylon with the girder is superior to the complete rigid fixity of the pylon with the girder and the way of supporting the main girder vertically at the pylon by bearings is advantageous.For the connection interfaces of the hybrid girders,the interfaces should be selected at the locations where the areas surrounded by the bending moment influential line and the datum line in the cross section are possibly small.
出处
《桥梁建设》
EI
CSCD
北大核心
2011年第1期1-4,9,共5页
Bridge Construction
关键词
斜拉桥
桥塔
结合梁
混合梁
刚度
支承体系
cable-stayed bridge
pylon
composite girder
hybrid girder
rigidity
supporting system
