钢筋混凝土箱拱桥施工支架安全性评定研究  

Study on Safety Evaluation of Construction Scaffold for Reinforced Concrete Box Arch Bridge

作　　者：陈文欢 谢开仲 CHEN Wen-huan;XIE Kai-zhong(Guangxi Communications Design Group Co.,Ltd.,Nanning,Guangxi,530029;College of Civil Engineering and Architecture,Guangxi University,Nanning,Guangxi,53000)

机构地区：[1]广西交通设计集团有限公司,广西南宁530029 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《西部交通科技》2018年第4期89-93,共5页Western China Communications Science & Technology

基　　金：国家自然科学基金资助(项目批准号:51068 001和51368005);广西重点实验室系统性研究项目资助(合同编号:2012ZDX04)

摘　　要：为研究钢筋混凝土箱拱桥现浇施工支架安全性能,文章结合中越北仑河第二座公路大桥工程实例,利用有限元理论,建立全桥的支架模型,对支架整体强度、刚度和稳定性进行分析,并且考虑不平衡施工、风载稳定性与局部构造强度,对拱脚施工支架进行安全性评定。结果表明:在最不利荷载作用下,支架整体强度、刚度和稳定性均满足规范要求,仅Ⅰ56a双拼工字钢、Ⅰ56a四拼工字钢和Ⅰ56a八拼工字钢等个别构件挠度值略小于规范限值,施工中适当予以加强。In order to study the safety performance of cast-in-place construction scaffolds for reinforced concrete box arch bridges,combining the engineering example of Sino-Vietnam Beilun River II highway bridge,by using the finite element theory,this article established a full-bridge support model to analyze the overall strength,stiffness and stability of the scaffold,then,considering the unbalanced construction,wind load stability and local structural strength,it conducted the safety evaluation of arched construction scaffold.The results showed that,under the most unfavorable load,the overall strength,stiffness and stability of the scaffold all meet the requirements of the specification,and only the deflection values of individual components such as Ⅰ56 a double-splice Ⅰ-beam,Ⅰ56 a quadruple Ⅰ-beam and Ⅰ56 a eight-splice Ⅰ-beam are slightly Less than the regulatory limit,which should be appropriately strengthened during construction.

关 键 词：钢筋混凝土箱拱桥 施工支架 整体分析 局部分析 安全性评定 

分 类 号：U448.223[建筑科学—桥梁与隧道工程]