木结构古建筑斗栱结构层抗震性能试验研究

Experimental study on the seismic performance of the structural layer with corbel bracket of ancient Chinese timber structure

为研究多攒斗栱组成的斗栱结构层在地震动中的抗侧移以及耗能能力,对2个缩尺试件进行水平低周反复荷载的拟静力试验,得到相应的滞回曲线以及骨架曲线,进而得出其位移延性系数、抗侧移刚度以及等效黏滞阻尼系数等指标。研究结果表明:斗栱层在横向与纵向受荷工况下均表现出良好的塑性变形能力;横向与纵向受荷工况下的抗侧移刚度随水平往复加载位移的增大而逐渐衰减退化,用指数函数式可较好拟合其衰减规律;等效黏滞阻尼系数h e随着加载位移的增加而逐渐增大。h e值以及累积滞回耗能E h的值较大,说明斗栱结构层耗能能力较好。研究结果可为西安城墙永宁门箭楼复建及其相类似结构的抗震性能评估提供理论依据。

In order to investigate the deformation and energy dissipation capacity of the structural layer with corberl bracket in the earthquake motion, two specimens were carried out under the action of pseudo-static test. The P-A curve and skeleton curve, displacement ductility coefficient, lateral stiffness, equivalent viscous damping coefficient and other indicators were obtained. The results indicate that the transverse and longitudinal load conditions show ex- cellent plastic deformation capacity. The lateral and vertical loading stiffness increases with the loading displacement decrease gradually. The degradation law can be fitted better by exponential function. The equivalent viscous damping coefficient increases with the increase of load displacement, he and cumulative hysteretic energy Eh is larger, and the structure layer with corbel bracket has excellent energy capacity. The research results can be used to reconstruct and evaluate the seismic performance of the embrasure watchtower of Yongning Gate of Xi＇an City Wall as well as the same type of structures.