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（1 上海市工程結(jié)構(gòu)安全重點(diǎn)實(shí)驗(yàn)室 上海市建筑科學(xué)研究院有限公司， 上海 200032；2 故宮博物院， 北京 100009）

［摘要］斗拱節(jié)點(diǎn)是傳統(tǒng)木結(jié)構(gòu)中典型的木木連接節(jié)點(diǎn)之一，其滯回性能對(duì)結(jié)構(gòu)的整體抗震性能至關(guān)重要。為跟蹤斗拱節(jié)點(diǎn)在低周反復(fù)荷載作用下的損傷演化過(guò)程，基于木材三維彈塑性損傷本構(gòu)模型開(kāi)展了斗拱節(jié)點(diǎn)滯回性能的有限元模擬分析。計(jì)算結(jié)果表明，有限元模型能合理表征節(jié)點(diǎn)滯回曲線的捏攏效應(yīng)、強(qiáng)度軟化行為和剛度退化行為。有限元模型對(duì)節(jié)點(diǎn)的初始剛度和水平承載力的預(yù)測(cè)結(jié)果與已有試驗(yàn)結(jié)果吻合較好，模擬誤差小于12.5%。該模型能合理反映櫨斗和木枋在加載過(guò)程中的轉(zhuǎn)動(dòng)變形和斗拱節(jié)點(diǎn)的損傷演化過(guò)程。參數(shù)分析結(jié)果表明，斗拱節(jié)點(diǎn)的承載力和耗能能力隨軸向壓力的逐漸增加而增加，當(dāng)軸向壓力超過(guò)40kN后，節(jié)點(diǎn)的承載力增幅降低。

［關(guān)鍵詞］彈塑性損傷模型；斗拱節(jié)點(diǎn)；滯回性能；軸向壓力

中圖分類號(hào)：TU366-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)09-0103-06

Analysis on hysteretic performance of dou-gong connection based on three dimensional elastic-plastic damage evolution

WANG Mingqian1, XU Qingfeng1, ZHOU Qian2, CHEN Xi1, LENG Yubing1, ZHANG Fuwen1

(1 Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China; 2 The Palace Museum, Beijing 100009, China)

Abstract:Dou-gong connection is one of the typical wood-to-wood connections in traditional wood structure. The hysteretic performance of such connections plays an important role in the seismic performance of the whole structure. To trace the damage evolution of dou-gong connection under reversed cyclic loadings, finite element model (FEM) analysis on hysteretic performance of dou-gong connection was conducted based on three dimensional wood elastic-plastic and damage constitutive model. Calculation results indicate that the FEM can reasonably represent pinch effect, strength softening behavior and stiffness degradation behavior of the connection hysteretic curve. The prediction results of the FEM on the initial stiffness and horizontal bearing capacity of the connections are in good agreement with the test results, and the simulation errors are less than 12.5%. The FEM can reasonably reflect the rotational displacements of cap block and wood beams during loading process and the damage evolution of dou-gong connection. Parametric analysis results indicate that the bearing capacity and energy dissipation capacity of dou-gong connection increase with the gradual increase of axial force. When the axial force exceeds 40kN, the connection bearing capacity decreases in growth.

Keywords:elastic-plastic damage model; dou-gong connection; hysteretic performance; axial force

*“十三五”重大科技專項(xiàng)課題（2018YFC0704802），上海市青年科技英才揚(yáng)帆計(jì)劃項(xiàng)目（19YF1441800）。

作者簡(jiǎn)介：王明謙，博士，高級(jí)工程師，Email: 1wangmingqian@#edu.cn；通信作者：許清風(fēng)，博士，教授級(jí)高級(jí)工程師，Email: xuqingfeng73@163.com。