密肋壁板结构低屈服点钢耗能减震研究

Seismic energy dissipation control research of the multi-ribbed slab structure using low yield point steel

根据密肋壁板结构体系的基本特点,结合低屈服点钢材的耗能特性,提出一种低屈服点钢耗能减震密肋复合墙板,实现对密肋壁板结构的减震控制。建立密肋壁板结构耗能减震控制体系的非线性地震反应分析模型,钢筋混凝土构件的恢复力模型采用可考虑刚度退化、强度衰减及捏缩效应的退化三线性模型,填充砌块和低屈服点钢板的恢复力模型采用光滑滞回模型。通过算例对耗能减震控制体系进行了地震响应分析。计算结果表明,在结构中布置少量的低屈服点钢RC密肋复合墙板就能取得明显的减震效果,结构在小震作用下的减震率可达到15%～30%;在中、大震作用下的减震率可达到30%～70%,从而为密肋壁板结构体系提供一种简单有效的减震措施。

According to the basic components and construct characteristic of the multi-ribbed slab structure( MRSS),a new kind of the seismic mitigation multi-ribbed composite wall slab was provided by locating low yield point steel panels within concrete sash. Based on an retrogressive three-linear resilience model using degrading control parameters of stiffness and strength degradation and slip pinching for representing reinforced concrete members and a smooth hysteretic model for representing infill silicate blocks as well as infill steel panels respectively,the nonlinear dynamic time-history analysis of the MRSS energy dissipation control systems under horizontal earthquakes has been carried out. The earthquake responses of the systems were calculated. The seismic mitigation effect and adaptability of the low yield point steel panels for MRSS were discussed. The calculating results show that the low yield point steel panels have obvious seismic mitigation effects,which seismic damping rate is 15% ～ 30% under the seismic frequent intensity,and is 30% ～70% under the seismic fortification intensity and the seismic seldom intensity for 8 degree seismic region according to China Code for Seismic Design of Buildings,so that a simple and effective seismic energy dissipation measures is provided for the multi-ribbed slab structure.