- 摘 要
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（1 南昌大學設計研究院， 南昌 330047； 2 井岡山大學建筑工程學院， 吉安 343000；3 南昌大學建筑工程學院， 南昌 330031）
［摘要］采用三維虛擬層合單元非線性有限元分析方法，經對一個兩跨四層RC框架分析算例驗證后，分別對三種軸壓比RC框架和剪力墻抗側性能進行模擬分析，分析結果表明，軸壓比越大側移剛度退化速率越快；構建三個不同剛度特征值的四層框架-剪力墻結構空間模型并進行抗側性能仿真分析，發(fā)現(xiàn)進入非線性階段后，框架分擔水平剪力比例隨水平荷載增大而提高，且結構剛度特征值越大提幅越多，極限荷載時分擔比例提至其初始值2倍以上。分析結果還表明，現(xiàn)行規(guī)范關于框架-剪力墻結構框架分擔樓層剪力的調整規(guī)定取值偏低。
［關鍵詞］三維實體退化虛擬層合單元； 框架-剪力墻結構； 軸壓比； 剛度特征值； 剛度退化； 剪力重分配
中圖分類號：TU398+.2文獻標識碼：A文章編號：1002-848X(2016)24-0050-06
Simulation analysis on lateral stiffness degradation and storey shear force redistribution of RC frame-shear wall structure with different axial compression ratios
Jia Yigang1, Wu Guangyu1, Yang Chunbaixue2, Zhang Qing1, Yuan Zhijun3
(1 Design and Research Institute, Nanchang University, Nanchang 330047, China; 2 School of Civil Engineering and Architecture, Jinggangshan University, Ji′an 343000, China; 3 School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China)
Abstract:The nonlinear finite element method based on degenerated three-dimension solid virtual laminated element theory was used. The validity and efficiency of the method were proved by analysis on a two-span four-layer RC frame model. The lateral performances of RC frame structure and shear wall structure with three axial compression ratios were analyzed respectively by the method. Analysis results show that greater axial compression ratio leads to faster lateral stiffness degradation rate. According to the analysis results, three four-layer RC frame-shear wall structure spatial models with different stiffness characteristic values were built to make lateral performance simulation analysis. Analysis results conclude that after entering the nonlinear phase, RC frame structure shares more proportion of horizontal shear force with increase of horizontal load, the distribution proportion amplitude is also even bigger with increase of structure stiffness characteristic value, and the distribution proportion under ultimate load can become initial value of more than two times. The adjustment value of distribution proportion of storey shear force about the frame structure of RC frame-shear wall structure in Chinese current design codes or specifications is lower than the reasonable value.
Keywords:degenerated three-dimensional solid virtual laminate element; frame-shear wall structure; axial compression ratio; stiffness characteristic value; stiffness degradation; shear force redistribution
*國家自然科學基金資助項目（51268044）。
通訊作者：吳光宇，博士，教授級高級工程師，Email: wuguangyu@ncu.edu.cn。
