高強(qiáng)鋼組合K形偏心支撐鋼框架抗震性能非線性有限元分析*
段留省1，蘇明周2，房正剛3，王喆4
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（1 長(zhǎng)安大學(xué)建筑工程學(xué)院， 西安 710061； 2 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055；3 中國(guó)電力科學(xué)研究院， 北京 100055； 4 中國(guó)建筑標(biāo)準(zhǔn)設(shè)計(jì)研究院有限公司， 北京 100048）
［摘要］高強(qiáng)鋼組合偏心支撐鋼框架是耗能梁段采用屈服點(diǎn)較低的鋼材、鋼框架采用高強(qiáng)鋼的新型雙重抗側(cè)力體系。為研究不同鋼材對(duì)抗震性能的影響，在試驗(yàn)的基礎(chǔ)上對(duì)5種K形組合偏心支撐鋼框架的抗震性能進(jìn)行非線性有限元分析。對(duì)有限元模型進(jìn)行分析時(shí)僅改變鋼材的強(qiáng)度等級(jí)，構(gòu)件截面和邊界約束條件與試驗(yàn)則完全一致，同時(shí)考率幾何非線性和材料非線性。通過對(duì)各試件耗能機(jī)理、應(yīng)力分布以及塑性鉸力學(xué)模型的分析表明，在耗能梁段相同的條件下，適當(dāng)提高框架鋼材強(qiáng)度等級(jí)可以抵抗耗能梁段應(yīng)變硬化產(chǎn)生的內(nèi)力增大效應(yīng)，從而避免因增大截面導(dǎo)致的用鋼量上升；此時(shí)結(jié)構(gòu)的延性雖有所下降，但剛度退化速率減緩，鋼框架殘余變形小，有利于震后修復(fù)。［關(guān)鍵詞］耗能梁段; 應(yīng)變硬化; 內(nèi)力增大系數(shù); 能量耗散中圖分類號(hào)：TU393.2 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)07-0086-07
Nonlinear finite element analysis on seismic behavior of high strength steel composite K-typed eccentrically braced steel framesDuan Liusheng1, Su Mingzhou2, Fang Zhenggang3, Wang Zhe4(1 School of Civil Engineering, Chang'an University, Xi'an 710061, China; 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3 China Electric Power Research Institute, Beijing 100055, China; 4 China Institute of Building Standard Design & Research Co. , Ltd., Beijing 100048, China)Abstract: High strength steel composite K-typed eccentrically braced steel frame is a new dual lateral load resisting system that adopts low yield point steel in link beam and high strength steel in steel frame. In order to study influences of different grades steel on seismic behavior, 5 K-typed eccentrically braced steel frames were analyzed by nonlinear finite element methods based on experiments. Considering the geometry nonlinearity and material nonlinearity, only steel strength grade was changed in finite element model analysis and the member sections and boundary constraints were still same to the experiment specimens. The energy dissipation mechanism, stress distribution and plastic hinge mechanical model of components were studied. The results show that for the same link beam, developing frame steel strength grade properly can resist the internal force increment effect due to the strain hardening of the link beam, thus avoiding the increase of the steel amount due to the section enlargement. Although the ductility of the structure is decreased, the rate of rigidity degeneration slows and residual deformation of steel frame is small which is easy for seismic retrofitting.Keywords: link beam; strain hardening; internal force increment coefficient; energy dissipation
* “十二五”科技支撐計(jì)劃課題（2013BAJ10B03-0）。作者簡(jiǎn)介：段留省，博士，工程師，Email:duanliusheng@126.com。
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