摘要
基于截面弯曲正应变分布的拟平截面假定及截面的轴力-弯矩-曲率(N-M-φ)关系,考虑了材料非线性、体外索与梁的应变不协调、体外索的二次效应等影响,编制了体外预应力波形钢腹板组合箱梁受弯全过程非线性分析程序。结合试验梁的全过程加载试验结果,研究表明:以混凝土开裂和受拉区普通钢筋屈服为分界点,体外预应力波形钢腹板组合箱梁受弯破坏全过程可分为明显的三个阶段:弹性阶段、开裂阶段、塑性阶段;编制的非线性程序能很好地预测了结构在极限状态下的承载能力和变形大小。研究还表明:体外索的二次效应对组合箱梁抗弯承载力影响较大,可通过设置跨中横隔板或转向块以减小其影响。
The ultimate flexural capacity of the external prestressed composite box girder with corrugated steel webs is investigated. For this purpose, based on the quasi-plane assumption of flexural strain distribution and axial force-bending moment-curvature relationship (N-M-φ) of sections, a nonlinear full-range-analysis program is developed to perform the flexural behavior analysis. The program considers effects of material nonlinearity, inconsistent strain between beam and external tendons as well as second-order effects of external tendons. Furthermore, an experiment is conducted on a simply supported beam with corrugated webs, and the numerical results obtained by the program are confirmed. Moreover, it is shown that (1) the whole process of the flexural rupture can be divided into three stages: elastic stage, crack stage and plastic stage. (2) the second-order effect of external tendons plays an important role on the ultimate flexural capacity of the beam, and the mid-span diaphragm can greatly reduce the second-order effect of external tendons.
出处
《工程力学》
EI
CSCD
北大核心
2009年第7期89-96,共8页
Engineering Mechanics
关键词
波形钢腹板组合箱梁
拟平截面假定
非线性
全过程分析
模型试验
composite box girder with corrugated steel webs
quasi-plane assumption
nonlinearity
full-range analysis
model test