摘要
为保证斜拉桥索塔锚固区受力可靠,基于受力特征和平面框架分析模型,推导了不同受力阶段预应力小半径大吨位环向U型预应力索塔锚固区控制截面环向应力的计算公式.结合实际工程,建立空间有限元模型,并进行预应力索塔锚固区斜向加载的足尺模型试验,得到了预应力施加阶段、正常使用阶段和非对称加载阶段塔壁的应力分布规律,通过与试验结果进行对比,验证了本文提出公式的适用性.研究结果表明:斜拉索水平力主要由环向预应力筋承担,非对称受力对锚固区受力影响不大,所提出的简化方法可为索塔锚固区设计提供参考.
Anchorage zone is crucial for the cable-stayed bridges and a plane frame model is presented to investigate the performance of the anchorage zone embedded with small radius U-shape pre-stress system, in pylon under different loading stages based on a summary and an analysis of the behavior of pre-stressed cable- pylons, and the expression for calculating the horizontal stress in the critic position of cable-pylon was deduced. A full-scale model test under oblique loading was conducted to analyze the mechanical behavior of pre-stressed cable-pylon according to a practical project and the stress distribution patterns of main members were obtained. The experimental results confirm the practice of the proposed method. The results show that, the pre-stress provides most vertical force to balance the cable load, and the behavior of anchorage zone has slight difference between asymmetrical and symmetrical loadings.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2013年第12期78-85,共8页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(51208430)
关键词
斜拉桥
索塔锚固区
环向预应力
受力机理
cable-stayed bridge
cable-pylon anchorage
hoop pre-stress
mechanic behavior
