古建筑木构架长周期地震响应分析

在目前古建筑研究领域中，对木构架的抗震分析绝大多数都是在普通地震动作用下，而对长周期地震动作用下的木构架动力研究相对较少。因此，本文主要选择了两条典型的长周期地震波和两条普通的地震波，对古建筑木构架整体结构在两类地震波作用下的动力响应进行比较研究。研究表明，台湾集集地震波和Loma-Prieta 地震波的长周期成分要比El-Centro地震波和兰州波的长周期成分丰富的多；两条长周期地震波的高频成分远远少于两条普通地震波；在小震时，古建筑木构架对长周期地震动的动力响应值与普通地震动相差不大，而在中震和大震时，对长周期地震动的动力响应值要远远高于普通地震动；大震（400gal）时木构架的减震效果比中震（220gal）、小震（110gal）时的减震效果要好。

Long-period seismic response of ancient timber buildings

In present research fields of ancient building,the seismic analysis of a timber structure is most under common earthquake,but studies on dynamic response of a timber structure under long-period earthquake are relatively few.Here,two typical long-period seismic waves and two common seismic ones were chosen,and the dynamic respones of the whole structure of an ancient timber building under the two types of waves were studied.Results showed that Chi-Chi and Loma-Prieta waves have much more components of leng period than El-Centro and LAN Zhou waves do;the two long-period seismic waves have far less higher frequency components than the two common seismic waves do;under light earthquake,the dynamic response of the structure to long-period and common seismic waves is probably the same,while under the moderate and heavy earthquakes,the dynamic response of the structure to long-period seismic waves is much larger than that to common seismic waves;the anti-vibration effect of the semi-rigid connection building Sun-Mao under heavy earthquake(400gal) is better than that under moderate(220gal)and light earthquakes(110gal).