摘要
利用ABAQUS有限元软件建立不同梁柱节点连接刚度的平面钢框架模型，采用SPRING2单元模拟梁柱连接，以不同弯矩-转角曲线作为节点约束条件，并通过添加位移约束方程实现多点位移控制加载。通过与两层两跨半刚性钢框架的实验结果进行模型验证，设定不同节点刚度影响系数α的值，建立一组不同节点刚度的六层两跨钢框架模型，对其进行了单向加栽及循环加载，对比分析了承载力、侧向刚度、延性、耗能能力、刚度退化等特性。结果表明：当α介于1／15～1／20时钢框架承载力及侧向刚度较高，且具有良好的延性及耗能能力。可为实际工程中节点设计提供参考。
The behavior of beam-to-column connections with angles falls between fully rigid and i- deal pin connections and belongs to the category of semi：rigid connections. In this paper,a series of steel plan frames with different degrees of connection stiffness are established in ABAQUS by modeling the beam-to-column connections with the SPRING2 element and using different mo- ment-rotation curves as the node constraint. Using multiple point constraints, the lateral force dis- tribution is maintained and displacement-controlled pushover analysis is achieved. The model is verified by comparing the simulated curve with the experimental curve of the load displacement of a two-floor-span semi-rigid frame. Based on the verification, a six-floor-two-span plane frame is modeled with different joint stiffness influence factors a. Inthe finite element analysis procedure,connective, geometric,and material nonlinearities are considered. The effect under different a fac- tors on the seismic performance is discussed, such as frame bearing capacity, lateral stiffness, duc- tility, energy dissipation, and stiffness deterioration. Analytic results show that frame bearing ca- pacity, lateral stiffness, ductility, and energy dissipation increase gradually with the reduction of the a factor, but the increase in amplitude slows down. The curve of stiffness degradation show that the degeneration of rigidity is obvious as the a factor reduces. In conclusion,when the joint stiffness influence factor a is between 1/15 and 1/20, the joint has higher bearing capacity and better ductility performance to meet the requirement of earthquake resistance. The above-mentioned conclusion can serve as guidance for engineering.
出处
《地震工程学报》
CSCD
北大核心
2014年第2期243-248,共6页
China Earthquake Engineering Journal
基金
地震科技发展基金(2014M01)
关键词
钢框架
多点位移控制
节点刚度影响系数
单向加载
循环加载
抗震性能
steel frame
multiple point constraint
joint stiffness influence factor
uniaxial load
cyclic load
seismic performance
