摘要
针对钢管混凝土拱梁组合桥在整体架设过程中,钢系梁稳定性差、混凝土系梁需配置较多预应力钢束的缺点,提出采用钢管劲性骨架系梁的整体架设施工方法。为研究钢管劲性骨架系梁在施工过程中对拱梁组合桥各主要构件的内力分配影响效果,以某公路下承式钢管混凝土拱梁组合桥为背景,采用MIDAS Civil和Abaqus软件分别建立实际桥梁的整体杆系有限元模型和拱脚结点实体有限元模型,对施工阶段各主要构件进行受力性能分析。结果表明:通过分批张拉钢管劲性骨架中的系杆,可以减小各施工阶段钢管劲性骨架的钢管应力;钢管劲性骨架可以有效分担施工过程中的拱肋应力,使拱肋和钢管劲性骨架受力均匀;拱脚结点以纵向受压为主;拱肋受力均匀,稳定计算满足要求;靠近拱脚的吊杆应力稍大于跨中的吊杆应力,吊杆应力满足要求。
In view of the defects that the stability of the steel tie beam is poor and lots of the prestressing strands have to be arranged for the concrete tie beam of the hybrid bridge of con-crete-filled steel tube （CFST） arch and girder in the integral erection, the construction method for the integral erection using the steel tube stiffen skeleton tie beam was proposed. To study the influences of the stiffen skeleton tie beam on the internal force distribution of the main compo-nents of the hybrid bridge in the construction, a highway through hybrid bridge of the CFST arch and girder was cited as an example, the software MIDAS Civil and Abaqus was used to respec-tively set up the integral link finite element model and the arch spring joint solid finite element model for the actual bridge and the mechanical behavior of the different main components of the bridge at the construction stages was analyzed. The results of the analysis indicate that the ten-sioning of the tie members in the steel tube stiff skeleton in batches can reduce the steel tube stresses of the stiff skeleton at the construction stages. The stiff skeleton can effectively share the arch rib stress in the construction and make the forces in the arch rib and stiff skeleton bal-anced. Finally, the arch spring joints are mainly in the longitudinal compression. The force in the arch rib is balanced and the stability calculation can accord with the requirements. The stresses in the hangers close to the arch springs are slightly greater than those in the hangers at the midspan and the stresses in the hangers can accord with the requirements as well.
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第1期25-30,共6页
Bridge Construction
基金
国家自然科学基金项目(51608125
51678154
51408132)~~
关键词
拱桥
拱梁组合桥
钢管混凝土
钢管劲性骨架
整体架设施工
有限元法
受力分析
arch bridge
hybrid bridge of arch and girder
concrete-filled steel tube
steel tube stiff skeleton
integral erection construction
finite element method
mechanical analysis
