缆索辅助组合体系桥梁结构设计关键技术  

Key Design Techniques of Cable-Auxiliary Composite Bridge Structure

作　　者：马振栋 邓文中 MA Zhen-dong;Man-Chung Tang(T.Y.Lin International Engineering Consulting(China)Co.,Ltd.,Chongqing 401121,China;T.Y.LIN International,San Francisco,CA94105,USA)

机构地区：[1]林同棪国际工程咨询(中国)有限公司,重庆401121 [2]林同炎国际公司,美国旧金山CA94105

出　　处：《桥梁建设》2022年第5期114-121,共8页Bridge Construction

基　　金：重庆市院士牵头科技创新引导专项项目(技术研发类)(cstc2017zdcy-yszxX0003);重庆市院士牵头科技创新引导专项项目(基础研究类)(cstc2018jcyj-yszxX0015)。

摘　　要：为给主跨100~300 m的中、大跨度桥梁设计提供参考,研究缆索辅助组合体系桥梁(索辅梁桥)的受力及结构特征;结合20余座索辅梁桥的设计实践,对索辅梁桥设计关键技术进行总结。该类桥梁适用于梁体高度不受限的峡谷、沟壑等桥位,或不具备设置高耸塔、拱结构时的桥梁设计情况,其基本设计原则为:可根据索辅梁桥的主跨跨度公式估算其主跨跨度适用范围;索辅梁桥结构体系优先采用整体固结体系;梁体需具有较强的竖向抗弯及抗剪承载能力;桥塔及拱结构采用轻型化的造型;缆索布置须使全桥受力均匀;锚固构造应具有传力直接、减小局部受力的特点。The load bearing behavior and structural characteristics of cable-auxiliary composite bridge structures(cable-auxiliary girder bridge)are studied,which are considered a feasible solution for the medium-sized and long-span bridges with main spans of 100 m to 300 m.Based on the design practices of more than 20 cable-auxiliary girder bridges,the key design techniques of the bridge of such type are summarized.The cable-auxiliary girder bridge suits valleys and ravines where the girder depth is not limited,and is also a solution for bridges that should not have high-rise pylons or arches.The basic design principles includes:predicting the applicable range of the main span lengths based on the main span length formula of the cable-auxiliary girder bridge;giving priority to the integral fixed system;allowing the girder to have better vertical anti-bending and anti-shearing capacity.The pylons and the arches should be made of light-weight materials.The arrangement of the cables should ensure the stress of the whole bridge is uniform,and the anchor structure should perform direct force transmission and decreases load bearing capacity at local parts.

关 键 词：索辅梁桥 缆索辅助组合体系 适用跨度 结构体系 梁体承载力 缆索布置 锚固构造 桥梁设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]