摘要
为使大跨度组合梁斜拉桥的结构性能更优,以某(80+290+768+70+70+70+60)m双塔双索面半飘浮体系混合梁斜拉桥方案为背景,从主梁断面型式、主梁参数(梁高、断面面积、桥面板厚度)、桥塔高度、桥面铺装及主梁钢-混结合段位置等对结构性能的影响进行对比分析。结果表明:主跨800m左右的组合梁斜拉桥在理论计算分析上具备可实施性;箱形断面组合梁较为适合用于大跨、宽幅组合梁斜拉桥;提高钢主梁断面的有效面积和桥塔高度对改善组合梁斜拉桥受力状况有较大帮助;大跨度组合梁斜拉桥桥面铺装厚度应结合总体受力、大气环境、荷载类型等因素考虑;钢-混结合段位置选取应兼顾受力特性、施工工艺简便和经济性。
To make the structural performance of long span composite girder cable-stayed bridge more optimal, the design scheme of a semi-floating system composite and hybrid girder cable-stayed bridge with double pylons, double cable planes and with span arrangement （80 ＋ 290 ＋ 768 ＋ 70 ＋ 70 ＋ 70 ＋ 60） m was selected as an example and the influences of the main girder section types, main girder parameters （e. g. the girder depth, girder section areas and deck slab thick-ness） ,pylon height, deck pavement thickness and the locations of the steel and concrete joint sections of the main girder on the structural performance of the composite girder cable-stayed bridge were comparatively analyzed. The results of the analysis indicate that in point of the theoretic calculation and analysis, the scheme of the composite girder cable-stayed bridge with a main span of about 800 m can be implemented. The composite girder of box section is more applicable to the long span and wide deck cable-stayed bridge. The increase of the effective area of the steel main girder section and the increase of the pylon height are helpful to the improvement of the force conditions of the composite girder cable-stayed bridge. The determination of the deck pavement thickness of the composite girder cablestayed bridge should consider the general force conditions, the atmospheric environment and the load types and the selection of the location of the steel and concrete joint section should simultaneously consider the force behavior, construction technology simplicity and economy.
出处
《桥梁建设》
EI
CSCD
北大核心
2016年第4期85-91,共7页
Bridge Construction
关键词
斜拉桥
组合梁
主梁型式
主梁参数
塔高
桥面铺装
结合段
结构设计
cable-stayed bridge
composite girder
main girder type, main girder parameter
pylon height
deck pavement
joint section
structural design
