现浇板钢筋对混凝土框架结构抗震影响分析
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摘要
通过对汶川地震后的震害分析调查发现,"强梁弱柱"成为震区框架结构破坏的普遍现象,说明采用现行GB50011-2001《建筑抗震设计规范》的相关规定,实际上无法实现"强柱弱梁"的要求。为解决这一问题,分析了影响混凝土框架结构实现"强柱弱梁"因素,特别从现浇楼板钢筋对实现"强柱弱梁"的影响和现浇板对框架梁正截面承载力的影响进行了深入研究,并在此基础上做了典型案例分析,提出具体设计对策和建议:(1)设计时有必要把6h'f宽度的楼板配筋作为梁的配筋,从而适当减小梁的截面配筋;(2)设计时不考虑楼板对梁刚度的加强作用计算梁的截面配筋,考虑楼板对梁刚度的加强作用计算柱的配筋。
It is discovered,from the analysis of the seismic damage after the Wenchuan earthquake,the universal destruction of frame structure in seismic areas was the"strong beam and weak column"model. Therefore the existing code for aseismmatic design of building structure( GB50011-2001) still do not have relevant provision to realize the strong column weak beam principle at present. In order to solve this problem,analysis based on the factors,which affected the application of the strong column weak beam principle on reinforced concrete frame structures,had been done. Furthermore a deep study aimed at the problems concerning the impacts of the reinforcing steel of the cast-in-place slab on the fulfill of the strong column weak beam principle and effects of the cast-in-place slab on the normal section bearing capactity of concrete frambeams got on quickly. Design countermeasures and proposes had been pointed out as follows: (1) It was necessary to take the reinforcement of the slab which was 6h'f in width as the reinforcement of the beams so as to reduce the reinforcing bars of the beams; (2) Regardless of the strengthening effects the slabs on the stiffness of the beams when calculating the reinforcing bars of the beams,and take the strengthening effects into account when calculating the reinforcing bars of the columns.
It is discovered,from the analysis of the seismic damage after the Wenchuan earthquake,the universal destruction of frame structure in seismic areas was the"strong beam and weak column"model. Therefore the existing code for aseismmatic design of building structure( GB50011-2001) still do not have relevant provision to realize the strong column weak beam principle at present. In order to solve this problem,analysis based on the factors,which affected the application of the strong column weak beam principle on reinforced concrete frame structures,had been done. Furthermore a deep study aimed at the problems concerning the impacts of the reinforcing steel of the cast-in-place slab on the fulfill of the strong column weak beam principle and effects of the cast-in-place slab on the normal section bearing capactity of concrete frambeams got on quickly. Design countermeasures and proposes had been pointed out as follows: (1) It was necessary to take the reinforcement of the slab which was 6h'f in width as the reinforcement of the beams so as to reduce the reinforcing bars of the beams; (2) Regardless of the strengthening effects the slabs on the stiffness of the beams when calculating the reinforcing bars of the beams,and take the strengthening effects into account when calculating the reinforcing bars of the columns.
引文
[1]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]蒋永生,陈忠范,周绪平,等.整浇楼板的框架节点抗震研究[J].建筑结构学报,1994,12(3):11-16.
[3]叶列平,曲哲,马千里,等.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.
[4]车轶,尤杰.中欧抗震设计规范关于“强柱弱梁”设计比较[J].大连理工大学学报,2009,49(5).
[5]高佐人,马千里.现浇楼板对框架结构柱梁强度比的影响研究[J].山西建筑,2009.
[6]朱炳寅.影响强柱弱梁的主要因素及设计对策[J].建筑结构(技术通讯),2008.
[7]CEN.BS EN199821:2004,Eurocode8:Design of structures for earthquake resistance-Part1:General rules,seismic actions and rules for buildings[S].London:British Standards Institution,2005.
[8]中国建筑科学研究院PKPM CAD工程部.PKPM建筑结构设计软件新功能详解[M].2008版.北京:中国建筑工业出版社,2008.
[2]蒋永生,陈忠范,周绪平,等.整浇楼板的框架节点抗震研究[J].建筑结构学报,1994,12(3):11-16.
[3]叶列平,曲哲,马千里,等.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.
[4]车轶,尤杰.中欧抗震设计规范关于“强柱弱梁”设计比较[J].大连理工大学学报,2009,49(5).
[5]高佐人,马千里.现浇楼板对框架结构柱梁强度比的影响研究[J].山西建筑,2009.
[6]朱炳寅.影响强柱弱梁的主要因素及设计对策[J].建筑结构(技术通讯),2008.
[7]CEN.BS EN199821:2004,Eurocode8:Design of structures for earthquake resistance-Part1:General rules,seismic actions and rules for buildings[S].London:British Standards Institution,2005.
[8]中国建筑科学研究院PKPM CAD工程部.PKPM建筑结构设计软件新功能详解[M].2008版.北京:中国建筑工业出版社,2008.
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