轻型木结构房屋动力特性测试及研究

Test and Investigation on Dynamic Characteristics of Wood-frame Constructions

摘要:

对国内第一所轻型木结构小学的三栋单体校舍动力特性进行了实测,并结合试验研究成果及国外文献调查结果,对轻型木结构房屋自振周期及阻尼比进行研究.研究发现轻型木结构房屋中石膏板参与结构耗能,同时提高结构的初始刚度;轻型木结构房屋阻尼比测试值与结构经历的振动幅值有关,振动幅值越大,测得的阻尼比也越大;利用实际地震记录、模拟地震振动台试验以及房屋受迫振动等方法测得的轻型木结构房屋阻尼比都接近或大于5%的规范建议值;研究验证了《轻型木结构建筑技术规程》对于3 层及以下轻型木结构房屋的地震影响系数α取最大值的合理性.

Abstract:

Field tests were performed on three wood-frame constructions in order to get their dynamic characteristics. Data obtained from the field tests, laboratory tests and literatures review were used to investigate the fundamental period and damping ratio of the wood-frame construction. Results show that gypsum board can not only dissipate the input earthquake energy but also increase structural stiffness. The damping ratio of wood-frame constructions is related to the amplitude of vibration, high damping ratio can be obtained depended on large amplitude vibration. The damping ratios of wood-framed construction obtained from earthquake records, shaking table tests, and forced vibration are close to or larger than 5% the value recommended in the code. And it is also confirmed that the earthquake coefficient of wood-frame constructions to be proposed to adopt the maximum value of the earthquake response spectrum curve in the Technical Specification of Wood-frame Construction is reasonable.