摘要
提出了一种新型的组合柱——以两块薄壁C型钢为基本骨架口对口拼接,在型钢腹板及翼缘处用结构胶黏剂黏结4块竹帘胶合板,形成截面形式为箱型的薄壁C型钢—竹胶板组合柱。以钢板厚度、长细比、轴压比等为基本参数,对5根组合柱进行了拟静力加载试验,观察组合柱在不同参数设置下的钢板、竹胶板的应变变化和荷载—位移滞回曲线,得到了组合柱的承载力指标和耗能系数、延性系数等抗震性能指标,在此基础上进行了组合柱的承载力计算方法分析。结果表明,长细比和钢板厚度对钢—竹组合柱加载初期的受力性能影响不明显,但影响柱子的后期极限承载力和刚度,而轴压比对组合柱的极限承载力和延性性能起着决定作用。根据钢—竹组合柱在弹性阶段的轴压力大小和应力—应变关系,提出了组合柱的力学简化模型及屈服承载力计算方法,其计算结果与试验值吻合较好。
The paper presents a new type of composite column composed by gluing four pieces of bamboo plywood on the surface of box columns and two pieces of thin-walled C steel spliced mouth to mouth in the core. Pseudo-static tests on a total of 5 composite columns were conducted in terms of steel sheet thickness, slenderness ratio and axial compression ratio of the columns. The bearing capacity, dissipative coefficient, ductility, and other indexes about seismic performance were acquired by analyzing the changes of strain in the steel sheets and bamboo plates and the load-displacement hysteretic curves under different parameters. Result shows that slenderness ratio and steel sheet thickness have little effect on the mechanical behaviors of initial load, but have effect on ultimate strength and stiffness under load imposed in the late period. Axial compression ratio makes a great diflerenee in beating capability and ductility performances of these columns. Based on the measurement of the axial pressure and the stress-strain curve within elastic range of the composite columns, a simplified mechanical model and a calculation method for yield bearing capacity were proposed. The calculated values of bearing capacity match welt with the experimental ones.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2011年第12期82-85,共4页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(50878106)
浙江省新苗人才计划项目(011-A00163104200)
关键词
组合柱
薄壁C型钢
竹胶板
拟静力试验
抗震性能
Composite columns
Thin-walled C steel
Bamboo plywood
Quasi-static tests
Anti-seismic capacity
