- 摘 要
-
(吉林建筑大學土木工程學院， 長春 130118)
［摘要］自主研制出一種組合角鋼改進型屈曲約束支撐，其具有自重輕、構造簡單、造價低等特點。通過對比不同填充材料、不同無粘結材料屈曲約束支撐的試驗研究，分析其滯回性能、拉壓不平衡系數(shù)以及耗能系數(shù)等力學參數(shù)，并運用有限元軟件ABAQUS進行數(shù)值模擬。研究結果表明，組合角鋼改進型屈曲約束支撐的滯回曲線飽滿且穩(wěn)定，耗能良好，拉壓差最小，各項性能參數(shù)均滿足《建筑消能減震技術規(guī)程》（JGJ 297—2013）的要求，具有較高的應用價值。輕骨料混凝土對支撐耗能影響較小，無粘結材料的摩擦系數(shù)對支撐性能影響明顯，摩擦系數(shù)越大，拉壓差越大，耗能降低，對支撐端部產(chǎn)生不利影響。試驗結果、理論計算與模擬結果吻合度較好。
［關鍵詞］組合角鋼；屈曲約束支撐；輕骨料混凝土；耗能能力；有限元分析
中圖分類號：TU398-7文獻標識碼：A文章編號：1002-848X(2021)03-0103-06
Experimental study and finite element analysis for improved BRB of combined angle steel
YANG Yanmin, HU Tingyi, WANG Bo, CHEN Yu
(School of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China)
Abstract:An improved buckling restrained brace （BRB） of combined angle steel has been developed independently with the characteristics of light weight, simple structure and low cost. The BRB tests of different filling materials and different unbonded materials were compared, and the mechanical parameters such as hysteretic behavior, tension and pressure unbalance coefficient and energy dissipation coefficient were analyzed, and finite element software ABAQUS for numerical simulation was used. The results show that the hysteretic curve of BRB for combined angle steel is full and stable, and the energy consumption is good, and the tension and pressure difference is least. Besides, performance parameters meet the Technical specification for energy dissipation and shock absorption of buildings（JGJ 297—2013）, and it has high value of application. The lightweight aggregate concrete has less influence on energy consumption of the support, and the friction coefficient of the unbonded material has obvious influence on the performance of the support, and the larger the friction coefficient is, the larger the tension and pressure difference, and the lower the energy consumption which has adverse effects on supporting ends. The experimental results agree well with the theoretical results and simulation results.
Keywords:combined angle steel;buckling restrained brace(BRB);lightweight aggregate concrete;energy dissipation capacity;finite element analysis
*國家重點研發(fā)計劃項目（２０１７ＹＦＣ０８０６１００），國家應急管理部安全事故防治科技項目（ｊｉｌｉｎ-０００１-２０１８ＡＱ），吉林省教育廳“十三五”科學技術研究規(guī)劃項目（ＪＪＫＨ２０１９０８７２ＫＪ）。
作者簡介：楊艷敏，碩士，教授，碩士生導師，Email:282872984@qq.com。
