体外预应力桥梁锚固结构的受力性能与配筋研究  

LOADING BEHAVIOR AND REINFORCEMENT DESIGN OF ANCHORAGES OF EXTERNAL PRESTRESSED BRIDGES

作　　者：杨美良[1] 李传习[1] 张建仁[1] 卢春玲[1] 

机构地区：[1]长沙理工大学桥梁与结构工程学院,湖南长沙410076

出　　处：《工程力学》2008年第6期159-164,175,共7页Engineering Mechanics

基　　金：湖南省交通科技创新项目(200410);湖南省教育厅基金项目(06C128)

摘　　要：通过两座不同截面类型的体外预应力桥梁锚固结构的空间应力分析,获得了其应力分布特点,指出了其薄弱环节。探讨了角钢、锚垫板、体外预应力钢管对锚固结构受力性能的影响。根据力流传递形式结合拉压杆模型方法,建立了锚固结构拉压杆配筋计算模型,提出了配筋建议。分析表明:在锚固结构与梁交接部位设置角钢,能有效地降低该位置混凝土的应力集中;按弹性材料分析得到的锚固结构附近区域混凝土的各应力值均不同程度地超出设计强度的若干倍,但考虑材料的非线性,考虑角钢、锚垫板、体外预应力钢管、钢筋网以及分布钢筋的作用,锚固结构混凝土的局部应力大为降低,满足规范限值要求。Based on the behavior analysis of two external pre-stressing concrete bridges with different cross section, three dimensional stress distribution characteristics of anchorages were obtained and the weakness of anchorages was indicated. In addition, the influence of angle iron, steel tie plate, external pre-stressing steel tube, was analyzed. Based on the loading transmitting path combined with strut-and-tie model, this paper proposes the strut-and-tie models for the reinforcement calculation of anchorage, and corresponding design suggestions. Analysis shows that the angle iron placed at the connection of the anchorages and girder effectively reduces the stress concentration caused by the huge tensile force. Considering material nonlinearity and the contributions of such members as the angle iron, steel tie plate, external pre-stressing steel tube, reinforcement web, and distributed reinforcement, the concrete stress of anchorage is reduced significantly.

关 键 词：桥梁工程 体外预应力 锚固结构 有限元法 拉压杆模型 

分 类 号：TU391[建筑科学—结构工程] U448[建筑科学—桥梁与隧道工程]