摘要
将索引入多高层钢结构,形成了耗能索支撑-框架结构,该结构体系能有效提高框架结构的抗侧能力和侧移延性及耗能能力。通过有限元分析,研究了索支撑-框架在不同轴压比下的滞回性能。研究了索截面面积、轴压比对结构耗能能力的影响规律,以及耗能过程中索力的变化规律。研究表明,索支撑-框架结构具有较好的反复耗能和自复位能力,支撑框架在轴压比为0.5左右时,耗能能力最优。索支撑可明显提高结构的抗侧刚度、侧移延性、极限承载力和有效耗能能力。随着索截面面积的增大,结构自复位能力提高,但耗能能力并非一直提高,提出了合理的索截面面积,以确保结构在耗能能力和自复位能力间得到良好的性能点。
In this paper, a new type of cable-braced energy-dissipation frame structure was proposed by adding cable brace into a high-rise building, which could improve lateral resistance, ductility and energy-dissipating capacity of steel frame effectively. Using finite element analysis, the hysteretic behavior of cable-braced frame with different axial compression ratios was studied. The influence rule of cable cross section and axial compression ratio on energy- dissipation capacity was also investigated, and the change rule of cable＇s internal force during the energy-dissipation process was studied as well. The results show that the cable-braced frame has a better energy-dissipation and self- centering ability under cyclic load. The best energy-dissipation capacity of cable-braced frame can be obtained when axial compression ratio is about 0.5. The cable brace can improve the lateral stiffness, ductility, bearing capacity and effective energy-dissipation. With the increase of cable＇ s cross section, the self-centering ability increases obviously while the energy-dissipation capacity only increases in a limited range, so the reference value of cable section was summarized to ensure abetter energy-dissipation and self-centering ability.
出处
《钢结构》
北大核心
2015年第4期48-53,共6页
Steel Construction
基金
国家自然科学基金项目(51248009)
关键词
索支撑-框架结构
自复位
轴压比
滞回性能
cable braced-frame structure
self-centering
axial compression ratio
hysteretic behavior
