【摘要】 为保护古建筑,采用振动台试验方法,研究了中国古建筑榫卯节点的有效抗震加固方法。基于某古建筑的实际尺寸,制作了1∶8缩尺比例的木结构空间框架模型,其中梁和柱采用燕尾榫形式连接。分别考虑马口铁、钢构件和CFRP布加固榫卯节点,进行了振动台试验。通过白噪声激励,获得了构架加固前后的基频及阻尼比;通过输入不同加速度峰值的El-Centro波,获得了典型节点的位移响应、加速度响应及减震系数等抗震参数。结果表明,构架加固前后的基频J(钢构件)>J(CFRP布)>J(马口铁)>J(未加固);阻尼比D(未加固)>D(马口铁)>D(钢构件)>D(CFRP布);构架位移响应峰值umax(CFRP布)<umax(钢构件)<umax(马口铁);构架加速度响应峰值amax(钢构件)<amax(CFRP布)<amax(马口铁);减震系数β(钢构件)<β(CFRP布)<β(马口铁)。因此,对于不同的加固方法而言,马口铁最差,CFRP布较好,钢构件最佳。更多还原

【Abstract】 To protect Chinese ancient building,strengthening methods on Chinese ancient tenon-mortise joint were studied by shaking table tests.Based on actual sizes of an ancient wooden building,wooden frame models with a scale of 1∶8 of the prototype structure were built considering Yan-wei type of tenon-mortise connections.Iron hook,steel components and CFRP(Carbon Fibre Reinforced Plastic) sheets were considered to strengthen tenon-mortise joint of model to enhance its stability.By white noise excitation values of basic frequency as well as damping ratio of model in both strengthened and unstrengthened conditions were obtained.By inputing El-Centro earthquake waves of different peak acceleration values,responses of displacement and acceleration for typical nodes of model were obtained,and vibration absorption ratio values for both model and tenon-mortise joint were discussed.Results showed that for different strengthening method:J(steel components)>J(CFRP sheets)>J(iron hook)>J(no-strengthen) in basic frequency of model(J).D(no-strengthen)>D(iron hook)>D(steel components)>D(CFRP sheets) in damping ratio of model(D).umax(CFRP sheets)<umax(steel components)<umax(iron hook) in peak displacement response value of model(umax).amax(steel components)<amax(CFRP sheets)<amax(iron hook) in peak acceleration response value of model(amax).β(steel components)<β(CFRP sheets)<β(iron hook) in vibration absorption ratio(β).Results showed that steel components is the best strengthening method,while iron hook is the worst one.更多还原