PC连续箱梁合龙束横向效应  

Transverse Effect of Bottom Continuity Tendons in Continuous PC Box Girder

作　　者：项贻强 唐国斌[1] 朱汉华 晁春峰[1] 

机构地区：[1]浙江大学土木工程系,杭州310058 [2]浙江省公路管理局,杭州310058

出　　处：《土木建筑与环境工程》2011年第3期25-30,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：浙江省交通厅科技项目(2008H38)

摘　　要：PC连续箱梁合龙束张拉不仅使底板纵向受压,同时在横向产生附加效应;以某跨海大桥为例,对底板合龙束作用机理进行探讨,并通过精细有限元模型,对施工过程中合龙束的横向效应进行分析和参数研究;结果表明,合龙束张拉过程中底板横向应力处于动态变化过程,其横向效应远大于恒载和其它预应力作用结果,同时,合龙束的横向效应对底板的线形、厚度及孔道保护层较为敏感;最后,基于横向框架法,通过引入预应力效应简化系数和孔道修正系数,提出合龙束横向效应的简化计算方法。Bottom continuity tendons induce transverse additive effect while providing longitudinal compression during the construction of PC box girder.Taking a cross-sea bridge for example,the mechanism of bottom continuity tendon is investigated.The transverse effect and parameters study are conducted through a refined model.It is illustrated that the state of bottom flange is in a dynamic changeable process during the tensioning of bottom continuity tendons,and the transverse effect caused by the tendons is much more than that by dead loading and other prestressing tendons.The transverse effect is more sensitive to alignment and thickness of the bottom flange,as well as concrete cover of the ducts.Finally,based on the simplified frame analysis,the design method is proposed by introducing prestressing effect simplified factor and duct modified factor.

关 键 词：桥梁工程 箱梁 合龙束 横向效应 参数分析 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]