芜湖长江大桥正桥施工监控测试与评估  

Construction, Supervision, Test and Assessment of the Main Bridge of Wuhu Yangtze River Bridge

作　　者：曾广武[1] 张士臣[1] 

机构地区：[1]铁道部科学研究院铁建所,北京100081

出　　处：《中国铁道科学》2001年第5期73-80,共8页China Railway Science

摘　　要：通过对芜湖长江大桥正桥斜拉桥部分中主桁的上弦杆、下弦杆、斜撑杆、竖杆、副桁的水平横杆、水平斜撑杆、竖向斜撑杆、混凝土桥面板的四个横截面及一个塔柱的 8对 6 4个斜拉索的施工全过程的实测 ,得到的结论是施工过程中斜拉桥的控制因素有三部分。第一部分为混凝土桥面板的应力 ,它控制着施工中斜拉索沿桥梁方向在不同截面处的张拉力的分配 ,它的应力在施工中已接近允许应力 ,是需要特别注意与重视的部分。第二部分为副桁的水平横杆 ,由于它是与斜拉索直接相连且为传递斜拉索张拉力的媒介 ,在施工中已接近允许应力 ,它控制着所能施加的单根斜拉索的最大索力。第三部分为主桁的上弦杆件 ,相对来说 ,其应力的发展比较平稳一些 ,但在全桥成桥后也快接近允许应力值 ,它将控制着桥梁的最终承载能力。斜拉索本身的索力由于在设计中已经充分考虑 ,在施工中其控制因素不明显 ,一般不会出现太大问题。We tested four transversal cross sections, the horizontal bracing, the horizontal declined bracing, the vertical declined bracing and reinforced concrete bridge floor, of the top chord tie, bottom chord tie, the declined bracing, the vertical tie, and the auxiliary truss of the main truss of the cable stayed part of the main bridge of Wuhu Yangtze River bridge. From the test we drew the conclusion that the control factors of cable stayed bridge in the construction process break into three parts: No 1 The stress of the reinforced concrete bridge floor. This stress controls the distribution of the tensioning forces at different cable cross sections along the bridge. This stress is close to the allowable stress during construction, which is worthy of note. No 2 the horizontal bracing of the auxiliary truss. This bracing is directly connected with the cable and is the media to transmit the tensioning force of the cable. Its stress is near the allowable stress during construction. It controls the maximum cable force applicable to each single cable. No 3 the top chord tie of the main truss. Relatively speaking, this stress develops stably. But when the whole bridge is completed, it is also near the allowable stress. It controls the eventual bearing capacity of the bridge. The cabling forces of the cable itself are fully considered during design, so it is not an obvious control element during construction and may not present a problem.

关 键 词：芜湖桥 斜拉桥 应力 施工监控 评估 测试 公路铁路两用桥 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U446.2[交通运输工程—道路与铁道工程]