自锚式预应力混凝土矮塔斜拉桥的力学极限跨径研究  

Study on Limitation Span of Self-anchored Extradosed Cable-stayed Bridge

作　　者：彭义 宋涛[2] 盛曼 江姣 Peng Yi Song Tao Sheng Man Jiang Jiao(Tianmen Building Quality Surveillance, Tianmen 473000, China Technology Center of .Second Harbor Engineering Co. Ltd., CCCC. , Wuhan 430040,China)

机构地区：[1]天门市建设工程质量监督站,湖北天门431700 [2]中交第二航务工程局有限公司技术中心,湖北武汉430040

出　　处：《石家庄铁道大学学报（自然科学版）》2017年第4期6-11,35,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家科技支撑计划(2011BAG07B03)

摘　　要：从主梁竖向挠度及应力、拉索强度、屈曲稳定性、抗风稳定性等的5个方面探讨了基于当前技术条件下的自锚式预应力混凝土矮塔斜拉桥的极限跨径。研究表明:屈曲稳定性是限制矮塔斜拉桥跨径增大的决定性因素,恒活载作用下的主梁应力居次要地位,而主梁挠度、拉索强度及结构抗风稳定性对该结构体系的极限跨径影响很小。预应力混凝土矮塔斜拉桥极限跨径的突破首先要解决该结构体系的屈曲稳定性问题。该研究成果可用于双塔塔梁固结、墩支承体系的矮塔斜拉桥的初步概念设计阶段选择合理的结构参数。The limit span of self-anchored concrete extrodosed cable-stayed bridge is discussed from the deformation and stress of main girder, the strength of the cable, the buckling stability , and anti- windy stability under the current condition of technology. The results show that the buckling stability is the main factor to limit the increase of extrodosed cable stayed bridge span; girder stress under dead and live load is secondary factor; while the girder deformation , cable strength, and anti-windy stability have little effect on the limitation span of extradosed cable stayed bridge. The primary problem of in- creasing extrodosed cable stayed bridge span is to improve the structural buckling stability. The result can be applied to selecting rational structural parameter for the extradosed cable stayed bridge with double-towers while the tower is rigidly connected with the girder and supported by the pier.

关 键 词：桥梁工程 矮塔斜拉桥 极限跨径 屈曲稳定性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]