钢管混凝土哑铃形拱面内极限承载力研究  

RESEARCH ON LOAD-CARRYING CAPACITY OF CONCRETE FILLED STEEL TUBULAR DUMBBELL SHAPED RIB ARCH UNDER IN-PLANE LOADS

作　　者：陈宝春[1] 盛叶[2] 

机构地区：[1]福州大学土木工程学院,福建福州351018 [2]福建农林大学交通学院,福建福州350002

出　　处：《工程力学》2009年第9期94-104,共11页Engineering Mechanics

基　　金：福建省基础性研究计划重大项目(2003F007)

摘　　要：进行了钢管混凝土哑铃形拱跨中和L/4处单点加载的面内受力全过程试验,试验结果表明哑铃形拱具有良好的弹塑性和较高的承载能力,加载全过程拱肋无局部屈曲现象,其面内受力性能与单圆管拱相似。建立了双重非线性有限元计算模型,有限元计算结果与试验结果吻合良好。进行了哑铃形拱采用等效梁柱法计算其面内极限承载力可行性的探讨。对模型拱面内极限承载力应用有限元和等效梁柱法的计算结果,进行了矢跨比、长细比、含钢率及加载方式等参数分析。分析结果表明:哑铃形拱的极限承载力随这些参数变化的规律与单圆管拱基本相同,等效梁柱法与有限元计算结果曲线变化规律一致,可供实际应用与进一步研究参考。Experiments on concrete filled steel tubular （CFST） dumbbell shaped rib model arches have been carded out with loads concentrated at crown and L/4 sections respectively. The result indicates that CFST dumbbell shaped rib arch has good elastic-plastic behavior and high strength, and no local buckling during the whole loading process. Its in-plane mechanic behavior is similar to that of the CFST arch with single tube. A dual nonlinear finite element model is developed and the calculation results agree well with the experiment results. A comparison of the load-carrying capacity of arches is carded out between the finite element method and the equivalent beam-column method. The parameters considered are the ratio of rise to span, slenderness ratio, steel ratio and loading patterns. It is found that the variation of load-carrying capacity of CFST dumbbell shaped rib arch are similar to those of the single tube rib arch. It is also found the calculated curves by the equivalent beam-column method and that by the finite element method have the same pattern.

关 键 词：钢管混凝土 哑铃形 拱 面内 极限承载力 试验 有限元 等效梁柱法 

分 类 号：TU398[建筑科学—结构工程] TU317.1