有无填充墙板的穿斗式木结构房屋振动台试验及对比分析

Shaking table tests and contrastive analysis for column-and-tie wooden buildings with and without infills

通过对不设置填充墙板与设置填充墙板的穿斗式木结构房屋进行模拟地震振动台试验,研究了穿斗式木结构的抗震性能,并对比分析了两模型结构的动力特性,及其在不同峰值加速度地震作用下的加速度放大系数、位移及最大层间位移角等动力响应。研究结果表明:两模型X向加速度动力放大系数在0.63~1.2,Y向加速度动力放大系数在0.51~0.97,说明模型榫卯挤压摩擦的耗能减震效果明显。不设置填充墙板的模型结构自振频率低、位移响应较大,扭转效应明显;设置填充墙板的模型抗侧刚度明显增大,结构自振频率增大,同时在地震激励下相对位移和层间位移角减小。两模型主体结构在大震作用下均无明显损坏,且设置填充墙板的木结构房屋具有更大的承载力和抗倒塌能力。

Shaking table tests for two column-and-tie wooden houses of one without infills and the other with infills were conducted to study aseismic performance of column-and-tie wooden structure.Dynamic characteristics of the two model structures,and their acceleration amplification factor,displacement and the maximum inter-layer displacement angle under different peak acceleration earthquakes were contrastively analyzed.Results showed that acceleration amplification factors of the two models in X and Y directions are 0.63-1.2 and 0.51-0.97,respectively,so squeezing friction between mortise and tenon has obvious energy dissipation and vibration reduction effect;the model structure without infills has lower natural frequencies,larger displacement responses and obvious torsion effect;the lateral stiffness of the model with infills obviously increases,the model’s natural frequencies also increase,and its relative displacement and interlayer displacement angle decrease under seismic excitation;main body structures of the two models have no obvious damages under action of large earthquake;the wooden house with infills has a higher load-bearing capacity and a collapse-resistance one.