摘要
根据钢筋混凝土桁架拱桥的各杆件均以承受轴力为主、节点处弯矩较小的受力特点,并基于钢筋与混凝土共同工作、协调变形原理,推导出适合钢筋混凝土桁架单元分析的理想弹塑性复合材料拉压不对称本构关系。对某钢筋混凝土桁架连拱桥,应用推导的本构关系,采用空间梁单元建立桁架连拱数值分析模型,结合静载试验对该本构关系进行校核检验。结果表明:各工况下各测点的变位和应变的计算值与相应实测值比较接近,尤其是非线性计算结果与实测结果非常接近;给出的钢筋混凝土杆系拉压不对称弹塑性本构关系有足够的可靠性,可供同类桥梁结构分析应用。
Because all staffs of RC trussed arch bridge mainly bear axial forces and only bear very small bending moment near the nodes, so spatial beam cells can be adopted to simulate the structure. Moreover, based on the theory that the steel and concrete can work together and distort in the phase, the steel and the concrete of RC trussed structure can be equal to a ideal elastic-plastic structure with dissymmetrical constitutive relation of stress-strain, the constitutive relation can benefit the same kind of RC trussed structure. Based on a trussed arch bridge, finite element models are established through computer, and the data analysis effects are compared with the effects of loaded testing. The result show that： the calculated value of the deflection and the strain of all measuri nonlinearity calculat steel and concrete 1 exact, and it can ng ed points is close to the corresponding measured value of that, especially the value of that is very close to the corresponding measured value of that~ the age dissymmetrical elastic-plastic constitutive relation of stress-strain is adopted in the same kind of bridges＇ structure analysis. 1 tab, 15 figs, 10 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第6期46-50,共5页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200731881232)
关键词
桥梁工程
桁架拱桥
有限元
本构关系
材料非线性
bridge engineering
trussed arch bridge
finite element
constitutive relation
material nonlinearity
