從汶川地震框架結(jié)構(gòu)震害談“強柱弱梁”屈服機制的實現(xiàn)
葉列平，曲哲，馬千里，林旭川，陸新征，潘鵬
- 摘 要
-
（清華大學(xué)土木工程系，結(jié)構(gòu)工程與振動教育部重點實驗室，北京 100084）［摘要］對汶川地震中鋼筋混凝土框架結(jié)構(gòu)的主要震害現(xiàn)象進行了簡要分析。重點針對地震中框架結(jié)構(gòu)未出現(xiàn)抗震設(shè)計所預(yù)期的“強柱弱梁”屈服機制的現(xiàn)象，從填充墻等非結(jié)構(gòu)構(gòu)件和樓板的影響、可能導(dǎo)致框架梁承載力和剛度增大的原因、造成框架梁端超配筋的原因、影響框架柱承載力發(fā)揮的原因，以及結(jié)構(gòu)在大震下受力狀態(tài)變化和不同受力階段的梁柱構(gòu)件的可靠度差異等方面進行深入的分析，并提出了有關(guān)建議，為今后框架結(jié)構(gòu)設(shè)計實現(xiàn)“強柱弱梁”屈服機制和規(guī)范修訂提供了參考。［關(guān)鍵詞］汶川地震；框架；震害；強柱弱梁Study on ensuring the strong columnweak beam mechanism for RC frames based on the damage analysis in the Wenchuan earthquakeYe Lieping, Qu Zhe, Ma Qianli, Lin Xuchuan, Lu Xinzheng, Pan Peng（Department of Civil Engineering, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua University, Beijing 100084, China）Abstract:Typical earthquake damages of RC frames in the Wenchuan earthquake are reviewed with some brief analyses. Special attentions are given to the absence of the preferable damage mode known as the “strong column-weak beam” mechanism. Analysis is conducted in depth in order to discover the underlying reasons for this adverse phenomenon in the following aspects: influence of the partitions and floor slabs, possible reasons for under-estimating the strength and stiffness of frame beams, reasons for the over-reinforcement of frame beams, factors that may weaken frame columns, structural model changing under stronger earthquake, the difference of reliability of columns and beams under different load stages and so on. Suggestions of ensuring the “strong column-weak beam” mechanism for RC frames are proposed for the reference of future design and code revision.Keywords:Wenchuan earthquake； frames； damage； strong column-weak beam mechanism*國家科技支撐計劃課題(2006BAJ03A02)。作者簡介：葉列平，教授，博導(dǎo)，Email:ylp@mail.tsinghua.edu.cn。參考文獻［1］GB50011—2001建筑抗震設(shè)計規(guī)范［S］. 北京:中國建筑工業(yè)出版社, 2001.［2］葉列平, 程光煜, 陸新征,等. 論建筑結(jié)構(gòu)抗震的魯棒性［J］. 建筑結(jié)構(gòu), 2008，38(6).［3］陳立保， 陳明祥， 高作平，等. 主廠房空間框架中考慮樓板作用的有限元分析［J］.工業(yè)建筑，2005，35(S1).［4］CHAKER A A, CHERIFATI A. Influence of masonry infill panels on the vibration and stiffness characteristics of R/C frame buildings［J］. Earthquake Engineering and Structural Dynamics,1999, 28(9).［5］劉建新. 填充墻框架房屋抗震設(shè)計新方法［J］. 四川建筑科學(xué)研究, 1997(2).［6］蔣永生, 陳忠范, 周緒平,等. 整澆梁板的框架節(jié)點抗震研究［J］. 建筑結(jié)構(gòu)學(xué)報, 1994, 12(3).［7］唐九如. 鋼筋混凝土框架節(jié)點抗震［M］. 南京：東南大學(xué)出版社, 1989.［8］FRENCH CW, MOEHLE JP. Effect of floor slab on behavior of slab-beam-column connections［J］. Design of Beam-Column Joints for Seismic Resistance, SP-123, American Concrete Institute, Farmington Hills, Mich., 1991.［9］LEON RT. The effect of floor member size on the behavior of reinforced concrete beamcolumn joints［J］. Proceedings of 8th World Conference on Earthquake Engineering, San Francisco, Calif., 1984.［10］PAULAY T. Developments in the design of ductile reinforced concrete Frames［J］. Bulletin of the New Zealand National Society for Earthquake Engineering, 1979, 12(1).［11］AMMERMAN OV, WOLFGRAM FRENCH C. RC beam-column-slab subassemblages subjected to lateral loads［J］. Journal of Structural Engineering, 1989, 115(6).［12］CHEUNG PC, PAULAY T, PARK R. New Zealand tests on full-scale reinforced concrete beam-column-slab subassemblages designed for earthquake resistance［R］. Design of Beam Column Joints for Seismic Resistance, SP-123, American Concrete Institute, Farmington Hills, Mich., 1991.［13］馬千里，葉列平，陸新征，
