连续刚构桥超高墩的风荷载模型与抗风构造研究  

Study on wind loading model of super high-pier for continuous rigid-frame bridge and wind-resistant structure

作　　者：郭琦[1,2,3] 田巨峰[4] 尹海军[1] 闫雯[1] 汪洁[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]结构工程与抗震教育部重点实验室,陕西西安710055 [3]西部建筑科技国家重点实验室(筹),陕西西安710055 [4]陕西省公路勘察设计院,陕西西安710068

出　　处：《西安建筑科技大学学报（自然科学版）》2010年第5期637-641,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：西安建筑科技大学校青年科技基金项目(QN0909);陕西省重点学科建设专项资金项目(E01004)

摘　　要：为了对一座具有超高墩的预应力混凝土连续刚构桥在施工过程中的抗风性能进行分析,依据桥址处的风环境确定了上、下部结构区别对待的风荷载模型.在最大悬臂典型工况下与静风荷载进行了对比分析,并在此基础上对该桥的抗风构造措施进行了优化.结果表明:在文中构造的风荷载模型中同时考虑了风压廓线变化及冲击作用对超高墩单T结构的影响,其响应输出更能反映出超高墩具有的特殊风动力特性,同时增加的风撑横系梁构造能够显著降低风荷载下墩顶位移,值得同类桥型抗风设计中借鉴.In order to commit detailed analysis on capability of anti-wind impacting for a continuous rigid-frame bridge with super high-pier,a dynamic wind loading model is constructed,distinguishing different characteristic of superstructure and substructure in accordance with wind environment of practical bridge site.Comparative analysis is made between static wind loading model and dynamic one in the key constructional stage-maximum cantilever stage and optimized wind-resistant structure designed.The result shows that the dynamic wind loading model is more suitable for analysis on dynamic properties of super high-pier considering air pressure profile and impacting factors.Simultaneously,the straining beam of wind bracing may reduce the displacement of super high-pier top under wind loading evidently and provides certain references to wind-resistant design on similar bridges.

关 键 词：悬臂施工 超高墩 风荷载模型 抗风构造 

分 类 号：TU378.8[建筑科学—结构工程]