服役PC桥梁应力状态评估方法  

Assessment Method of Stress Station for Existing PC Bridge

作　　者：闫磊[1] 侯斌[2] 柳颖臣 

机构地区：[1]长安大学公路学院,西安市710064 [2]中交公路规划设计院有限公司,北京市100088 [3]湖州市公路管理处,湖州市313000

出　　处：《公路》2012年第9期74-78,共5页Highway

基　　金：国家西部交通建设科技项目;项目编号200831849404;高等学校博士点专项科研基金;项目编号200807101008

摘　　要：为了评估服役PC桥梁正常使用状态下全预应力构件及A类构件的应力状态,利用横张增量法对钢束有效预应力的统计规律进行了研究,结果表明:有效预应力统计参数服从正态分布且KEP～N(0.97,0.09)。在此基础上,利用可靠度方法构造了抗力(应力)概率模型、恒载效应概率模型、汽车及人群荷载效应概率模型,以应力失效准则为依据给出了最小可靠指标,从而建立了服役PC桥梁应力状态评估方法。In order to evaluate the stress station of the full prestress and A-class components under normal service conditions, the vertical tensioned increment method is applied to study the statistic disci- pline of effective prestress for existing PC bridges. The results show that the statistical parameters of ef- fective prestress obey normal distribution and KEP-N（0. 97,0.09）. On this basis, the stress-resisting probabilistic model are constructed, and the dead load effect probabilistic model, the vehicle load and the crowd load effect probabilistic model are established, the minimum reliability index is presented according to stress failure criterion. And the assessment method of stress station for existing PC bridge is presented.

关 键 词：PC桥梁 正常使用状态 应力 评估 方法 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]