装配式零初始索力摩擦耗能复位支撑力学性能试验研究

EXPERIMENTAL ANALYSIS OF MECHANICAL PROPERTIES OF FABRICATED FRICTION DISSIPATION RE-CENTERING BRACE WITH ZERO INTIAL CABLE FORCE

提出了一种装配式零初始索力摩擦耗能复位支撑(FZFRB),该支撑具有简单的构造形式,既能在震后为结构提供回复力,又能避免索体预应力损失。设计了两个试件,并对其力学性能进行了数值模拟和拟静力试验研究。结果表明:该支撑采用的两组初始索力为零的镀锌钢丝绳索体交替受力、传力杆带动黄铜-槽孔钢摩擦板耗能器耗能的构造形式切实可行;该支撑在受力过程中无刚度退化现象,滞回曲线饱满,耗能规律稳定;数值模拟与试验得到的滞回曲线吻合较好;当支撑复位停止后,放松黄铜-槽孔钢摩擦板耗能器中高强应变螺栓,使支撑继续复位至位移零点时的残余荷载仅为-0.12 k N,说明支撑具有很好的复位功能。

Fabricated friction dissipation re-centering brace with zero initial cable force （FZFRB） is proposed. It has simple structure and the functions of energy dissipation, re-centering, avoiding the loss of prestress. Two specimens were designed and the pseudo-static tests were made. The numerical simulations of the tests were also carried out. The results showed that, the structure that two groups of galvanized steel wire ropes with zero initial cable force alternating stress and dowel bar leading brass-slots steel plate of friction energy dissipation to consume energy is feasible. There is no stiffness degradation in the loading process, and the brace has full hysteretic curve, stability energy dissipation law. Consistence is found between the numerical simulation results and experiment hysteresis curves. When the re-centering process stops, relaxing high strength strain bolts of brass-slots steel friction plates dissipation can let the brace back to zero displacement with the residuary load only -0.12 kN, which demonstrates that the brace has excellent re-centering function.