斜拉钢管混凝土拱桥结构静力分析.pdf

华东交通大学硕士学位论文斜拉钢管混凝土拱桥结构静力分析姓名:李杨申请学位级别:硕士专业:结构工程指导教师:徐海燕;上官兴 20060614 摘要斜拉钢管混凝土拱桥结构静力分析摘要本文对斜拉钢管混凝土拱桥的结构特点进行了系统的分析,该桥型是在“桁式组合拱桥”结构特性分析的基础上,将钢管混凝土拱桥、斜拉桥等桥型中的某些技术特点综合运用于一体的新桥型。斜拉钢管混凝土拱桥结构整体以钢管混凝土拱的受力特性为主,杆件节点连接牢靠,施工中质量小,拼装容易,成桥后结构耐久性较钢筋混凝土拱肋更优;上弦在适当位置断开,减小了整体结构的超静定次数,使全桥各杆件的内力更为均衡,使得温变引起的上弦拉力大幅下降;柔性斜拉索取代了桁式组合拱桥的刚性拉杆,在施工阶段可运用“恒载零弯矩”理论来不断的调整索力,确保桥梁位置的准确,同时成桥后通过索力调整,使拱肋各截面压力线偏移均衡,更好的发挥钢管混凝土拱的作用。论文结合工程实例对该桥型进行了系统的分析,给出了有限元计算模型,研究的成果可用于以后的斜拉钢管混凝土拱桥的设计工作当中。关键词:上弦断开,斜拉索,静力分析,索力优化 Abstract CANT NG PULL STEEL TUBE CONCRETE ARCH BR DGE STRUCTURE STATICAL ANALYSIS ABSTRACT The design featureproceed know clearlysystematic analysis ofthe text versus canting pull steeltube concrete archbridge,it isabove’'joist typebuilt—up archbridge”architectural characteristicanalytic foundation tosaidbridge type,certain technical chamcterstic point syntheses handle to oneness new bridge type among steel tube concrete arch bridge, stayed—cable bridge type. Direct tocanting pull steeltube concrete archbridge’S construction features,set for know clearly finiteelement analysis’model,through themedium pose under theaction ofdead loadanalyses。get bridge type monolithic construction witllarch’stress characteristic givepriority tofairing;through themedium ofcontinuous beam breakpoint pose impact analysis,the mount versus scale structuralde孕ee ofstatical indeterminacy,down ofthe derivebreakpoint、it isnecessary towane continuous beam ewe warm upchange creativepull:the orthodox construction ofthediagonal barhereon breach joist typebuilt—up archbridge usually use stiffpole,adopt flexibilitydragline,keep outof joist typebuilt—up archbridge stiffpole non·tunable whole hypogene ing,eed bridge queen could through themedium ofoptimize cablenumber cam cable force gotten archring each section pressure linedeparture proportion,the action ofthepreferable exert steel tube concrete arch,CBSurC bridge structure internalforcedistributiveproportion against. Construction stage,said bridge typeadopt”dead load zero bending