鋼框架－混凝土核心筒結(jié)構(gòu)框架地震設(shè)計剪力標準值研究
錢稼茹 魏 勇 蔡益燕 郁銀泉 申 林
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（1 清華大學土木工程系 北京 100084；2 中國建筑設(shè)計研究院標準院 北京 100044）［提要］ 為研究雙重體系鋼框架混凝土核心筒結(jié)構(gòu)的框架設(shè)計地震剪力標準值，對20個鋼框架-混凝土核心筒結(jié)構(gòu)模型進行了靜力彈塑性分析。從承載力、結(jié)構(gòu)失效模式和框架破損程度三個方面評價20個計算模型的抗震能力。根據(jù)推覆分析結(jié)果，提出了如下設(shè)計建議：8度抗震設(shè)防時鋼框架-混凝土核心筒結(jié)構(gòu)的剛度特征值λ大于0.65，各層框架的設(shè)計地震剪力標準值不小于本層總剪力的18％和不小于框架-核心筒結(jié)構(gòu)計算得到的地震剪力的1.2倍（加強層和頂層的剪力可不小于框架-核心筒結(jié)構(gòu)計算得到的地震剪力），框架角柱軸壓比不大于0.5。算例表明，符合建議的鋼框架-混凝土核心筒結(jié)構(gòu)，在地震作用時不會出現(xiàn)不合理的破壞形態(tài)。［關(guān)鍵詞］ 鋼框架-混凝土核心筒結(jié)構(gòu) 靜力彈塑性分析 剛度特征值 框架設(shè)計地震剪力標準值 軸壓比Study on Seismic Design Shear Force for Frame of Steel Frameconcrete Core Wall Structures/Authors:Qian Jiaru1, Wei Yong1, Cai Yiyan2, Yu Yinquan2, Shen Lin2(1 Tsinghua University, Beijing 100084, China; 2 China Architecture Design & Research Group, Beijing 100044, China)Abstract:To study seismic design shear force for steel frame of steel framereinforced concrete core wall structures, static elasto-plastic analysis (pushover analysis) of 20 structural models was conducted. The earthquake resistant capacity of the 20 structure models is evaluated by three aspects, i.e., load carrying capacity, structural failure mode and seismic damage index under structural failure state. It is recommended that for steel frame reinforced concrete core wall structures the structural stiffness characteristic value should be larger than 0.65, the standard value of seismic design shear force of the steel frame should not be less than 18% of the total storey shear and should not be less than 1.2 times of the frame shear obtained by analysis of steel frame RC core wall structure (for the strengthen storey and the top storey, should not be less than the frame shear obtained by analysis of steel frameRC core wall structure), the axial force ratio of corner steel columns should not be larger than 0.5. It is demonstrated by a calculation example that under earthquake excitations un-excepted failure mode would not occur for steel frame RC core wall structures which satisfy the above requirements.Keywords:steel frame reinforced concrete core wall structure; static elasto-plastic analysis; structural stiffness characteristic value; standard value of seismic design shear force; steel frame; axial force ratio*國家科研院所技術(shù)開發(fā)研究專項資金資助項目2002。
