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(1 北京工業(yè)大學(xué)工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室，北京 100022； 2 故宮博物院，北京 100009)

［摘要］以四川廣元市某古建筑木結(jié)構(gòu)為例，在考慮墻體嵌固作用的基礎(chǔ)上，研究了汶川地震下古建筑的震害癥狀與地震響應(yīng)狀況。采用ANSYS軟件對(duì)該古建筑榫卯節(jié)點(diǎn)的半剛性特征及磚砌體與木構(gòu)架的嵌固作用進(jìn)行了模擬，并建立了結(jié)構(gòu)的有限元模型。通過(guò)模態(tài)分析，獲得了結(jié)構(gòu)的基頻和主振型；通過(guò)將汶川波進(jìn)行調(diào)幅作用于該結(jié)構(gòu)，獲得了結(jié)構(gòu)在不同時(shí)刻的內(nèi)力及變形峰值，并獲得了典型節(jié)點(diǎn)的地震響應(yīng)曲線。結(jié)果表明：考慮墻體的嵌固作用后，該古建筑的基頻為1.59Hz，振動(dòng)形式以第一振型為主，地震作用下木構(gòu)架產(chǎn)生的位移很小，內(nèi)力均在容許范圍內(nèi)，且保持穩(wěn)定的振動(dòng)狀態(tài)；墻體由于強(qiáng)度不足，在某些部位將產(chǎn)生破壞，與震害現(xiàn)狀基本吻合。

［關(guān)鍵詞］古建筑木結(jié)構(gòu)；震害；動(dòng)力響應(yīng)；嵌固墻體；汶川地震

Study on damage numerical simulation of an ancient wooden building embedded with masonry walls

Zhou Qian^1,2, Yan Weiming¹, Ji Jinbao¹(1 Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100022, China; 2 Imperial Palace Museum, Beijing 100009, China)

Abstract:An ancient wooden building with embedded masonry walls in Guangyuan city was taken as an example to study the damages of ancient buildings in Wenchuan Earthquake. Semi-rigid character of tenon-mortise joints and contacting effect between wall and wooden constitution were simulated with ANSYS program, and the finite element model of the structure was also built. Basic frequency and main modes of the structure were obtained from modal analysis. By applying the amplituding acceleration data of Wenchuan waves to the building, responses of displacement and inner forces of the structure were obtained. Results show that based on embedding effects of masonry walls, basic frequency of the structure is 1.59Hz, of which main mode is mode one. Under earthquake forces, the wooden constitution keeps stable vabration status and its responses with little displacement and inner forces are all within the acceptable values. On the other hand,the masonry walls will be destroyed on some parts under the earthquake because of strength failure,which are basically consistent with those of actual damage.

Keywords:ancient wooden building; earthquake damage; dynamic response; embedded wall; Wenchuan Earthquake

作者簡(jiǎn)介：周乾，工程師，博士研究生，Email:zy-7225@yahoo.com.cn。

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