無地下室框架結(jié)構(gòu)整體計(jì)算模型的討論
劉慶志1,賀小崗2,趙作周1,錢稼茹1
- 摘 要
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(1 清華大學(xué)土木工程系土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室,北京 100084; 2 清華大學(xué)建筑設(shè)計(jì)研究院,北京 100084)[摘要]結(jié)合5·12汶川地震中框架結(jié)構(gòu)“強(qiáng)梁弱柱”與“柱腳塑性鉸”等實(shí)際震害特征,通過對(duì)一座典型框架不同計(jì)算模型計(jì)算結(jié)果的分析對(duì)比,對(duì)采用獨(dú)立基礎(chǔ)并設(shè)有基礎(chǔ)拉梁的現(xiàn)澆鋼筋混凝土框架結(jié)構(gòu)的整體分析計(jì)算模型進(jìn)行了討論與參數(shù)分析,建議可僅按柱底嵌固于拉梁上表面的分析模型進(jìn)行上部整體結(jié)構(gòu)的計(jì)算分析與配筋,這樣梁端設(shè)計(jì)彎矩略有下降而柱端設(shè)計(jì)彎矩有所增加,更易于實(shí)現(xiàn)強(qiáng)柱弱梁的抗震目標(biāo),這樣的分析模型設(shè)計(jì)簡便并更符合實(shí)際結(jié)構(gòu)受力情況。對(duì)拉梁以及拉梁以下柱及柱基礎(chǔ)設(shè)計(jì)配筋方法提出了建議。[關(guān)鍵詞]框架結(jié)構(gòu);計(jì)算模型;嵌固位置;拉梁Discussion on rational model of RC frame structures without basementLiu Qingzhi1,He Xiaogang2,Zhao Zuozhou1,Qian Jiaru1(1 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Architectural Design and Research Institute of Tsinghua University, Beijing 100084, China)Abstract:Based on the behavior of RC frame structures in 5·12 Wenchuan earthquake, such as strong beam and weak column, plastic hinge at column foot occurred near ground level, etc., and comparison of predicted results of a typical RC frame structure under different analytical models, a rational analytical approach for a RC frame with separate column bases tied together by tie beams was proposed. In this approach, the bottom columns are assumed to be fixed at the top level of the tie beams rather than at the top of the column bases, and the inner forces for the upper structure members are used for their reinforcement. As a result, the design moments near beam ends will decrease and the design moments near column ends will increase. This result is more close to strong column and weak beam of national seismic design code requirement. This approach is simple and more reliable. Design methods for bottom columns, tie beams and column bases were proposed as well.Keywords:frame structure; analytical model; fixed level; tie beam國家科技支撐計(jì)劃項(xiàng)目(2009BAJ28B01),國家自然科學(xué)基金重點(diǎn)項(xiàng)目資助(90815025),國家自然科學(xué)基金項(xiàng)目資助(50978148)。通訊作者:趙作周,博士,副教授,Email:zzzhao@tsinghua.edu.cn。參考文獻(xiàn)[1] 羅福午,方鄂華,葉知滿. 混凝土結(jié)構(gòu)及砌體結(jié)構(gòu)(下冊(cè))[M]. 北京:中國建筑工業(yè)出版社,1992.[2] 方鄂華,錢稼茹,葉列平. 高層建筑結(jié)構(gòu)設(shè)計(jì)[M]. 北京:中國建筑工業(yè)出版社,2003.[3] 羅福午,石裕翔,張惠英. 單層工業(yè)廠房結(jié)構(gòu)設(shè)計(jì)[M]. 2版. 北京:清華大學(xué)出版社,1990.[4] 尼爾遜. 鋼筋混凝土結(jié)構(gòu)設(shè)計(jì)[M]. 2版. 過鎮(zhèn)海,方鄂華,莊崖屏,等,譯. 北京:中國建筑工業(yè)出版社,2003.[5] 05SG109-3民用建筑工程設(shè)計(jì)常見問題分析及圖示(混凝土部分)[S]. 2005.[6] 葉列平,曲哲,馬千里,等. 從汶川地震框架結(jié)構(gòu)震害談“強(qiáng)柱弱梁”屈服機(jī)制的實(shí)現(xiàn)[J]. 建筑結(jié)構(gòu),2009,39(11):52-59,67.[7] 田志鵬,張新培,趙統(tǒng). 汶川地震中多層鋼筋混凝土框架結(jié)構(gòu)房屋震害分析[J]. 建筑結(jié)構(gòu),2009,39(11):67-71.[8] 李喬,趙世春. 汶川大地震工程震害分析[M]. 成都:西南交大出版社,2008.[9] 李英民,劉立平,韓軍,等. 5·12汶川地震建筑震害與啟示[R]//汶川地震建筑震害調(diào)查與災(zāi)后重建分析報(bào)告. 北京:中國建筑工業(yè)出版社,2008:59-64.[10] 李文峰,苗啟松,劉岸雄. 汶川地震后都江堰市鋼筋混凝土結(jié)構(gòu)震害調(diào)查及修復(fù)建議[R]//汶川地震建筑震害調(diào)查與災(zāi)后重建分析報(bào)告. 北京:中國建筑工業(yè)出版社,2008:100-108.[11] 汶川8.0級(jí)地震工程震害概覽[J]. 地震工程與工程振動(dòng),2008,28(S):27-58.[12] 中國建筑科學(xué)研究院. 2008年汶川地震建筑震害圖片集[M]. 北京:中國建筑工業(yè)出版社,2008:79-114.[13] 中國建筑西南設(shè)計(jì)研究院有限公司,馮遠(yuǎn),劉宜豐,等. 來自汶川大地震親歷者的第一手資料——結(jié)構(gòu)工程師的視界與思考[M]. 北京:中國建筑工業(yè)出版社,2009:52-87.
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