大体积混凝土结构构件最小配筋率
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摘要
通过回顾总结SDJ 20—78《水工混凝土结构设计规范》大体积混凝土结构构件配筋方法的演变过程,对比分析国内外各行业规范相关条文,研究条文依据的原理,提出新的大体积混凝土结构构件最小配筋率处理方法和相关条文建议。所提方法结合了现行DL/T 5057—2009《水工混凝土结构设计规范》和ACI 318—14《Building Code Requirements for Structural Concrete》的优点,使其既能保证ρ<ρ_(min)时所需钢筋用量为固定值,又能保证γ_dM小于但靠近开裂弯矩M_(cr)时不会发生少筋破坏,且取消了DL/T 5057—2009规范大体积混凝土最小配筋率条文只适用于"卧置在地基上以承受竖向荷载为主、板厚大于2.5 m的底板"等限制。
With reviewing and summarizing the evolution of the reinforcement methods for massive concrete structures in Design Specification for Hydraulic Concrete Structures(SDJ 20-78), the regulations of the minimum reinforcement ratio of massive concrete in currently domestic and oversea codes of various industries are compared and analyzed, and the principles of relevant provisions are investigated. A new method to determine the minimum reinforcement ratio is presented and the recommendations on relevant provisions are made. The advantages of DL/T 5057-2009 and Building Code Requirements for Structural Concrete(ACI 318-14) are combined skillfully in the suggested method, which guarantes that the amount of reinforcement is fixed when ρ<ρ_(min), ensures that the less reinforcement failure will not occur when γ_dM is less than and close to the cracking moment M_(cr). In addition, the limit that the minimum reinforcement ratio for massive concrete structures in DL/T 5057-2009 is only applicable to the bottom plate mounted on foundation and mainly subjected to vertical load with more than 2.5 m thickness is eliminated.
With reviewing and summarizing the evolution of the reinforcement methods for massive concrete structures in Design Specification for Hydraulic Concrete Structures(SDJ 20-78), the regulations of the minimum reinforcement ratio of massive concrete in currently domestic and oversea codes of various industries are compared and analyzed, and the principles of relevant provisions are investigated. A new method to determine the minimum reinforcement ratio is presented and the recommendations on relevant provisions are made. The advantages of DL/T 5057-2009 and Building Code Requirements for Structural Concrete(ACI 318-14) are combined skillfully in the suggested method, which guarantes that the amount of reinforcement is fixed when ρ<ρ_(min), ensures that the less reinforcement failure will not occur when γ_dM is less than and close to the cracking moment M_(cr). In addition, the limit that the minimum reinforcement ratio for massive concrete structures in DL/T 5057-2009 is only applicable to the bottom plate mounted on foundation and mainly subjected to vertical load with more than 2.5 m thickness is eliminated.
引文
[1]汪基伟,张雄文.水工钢筋混凝土结构有限元设计计算原则[J].水利水电科技进展,2005,25(5):44-47.(WANG Jiwei,ZHANG Xiongwen.Calculation principle for finite element design of hydraulic reinforced concretestructures[J].Advances in Science and Technology of Water Resources,2005,25(5):44-47(in Chinese))
[2]中华人民共和国水利电力部.水工钢筋混凝土结构设计规范:SDJ 20-78[S].北京:中国标准出版社,1978.
[3]中华人民共和国电力工业部.水工结构混凝土设计规范:DL/T 5057-1996[S].北京:中国标准出版社,1996.
[4]干城.水工大体积矩形截面纯弯构件的配筋计算[J].西北水电,1991(2):18-20.(GAN Cheng.Reinforcement calculation of large rectangular section pure bending members of hydraulic engineering[J].Northwest Hydropower,1991(2):18-20.(in Chinese))
[5]中华人民共和国国家能源局.水工结构混凝土设计规范:DL/T 5057-2009[S].北京:中国标准出版社,2009.
[6]周氐,陈礼和.水工钢筋混凝土构件最小配筋率的研究[J].河海大学学报(自然科学版),1992,20(1):44-51.(ZHOU Di,CHEN Lihe.Study on the Minimum Reinforcement Ratio of Hydraulic Reinforced Concrete Members[J].Journal of Hohai University(Natural Sciences),1992,20(1):44-51.(in Chinese))
[7]中华人民共和国住房和城乡建设部.混凝土结构设计规范(2015年版):GB 50010-2015[S].北京:中国建筑工业出版社,2015.
[8]中华人民共和国交通运输部.水运工程混凝土结构设计规范:JTS 151-2011[S].北京:人民交通出版社,2011.
[9]American Concrete Institute.Building Code Requirements for Structural Concrete:ACI 318-14[S].Farmington Hills:American Concrete Institute,2014.
[10]European Committee for Standardization.2004 Eurocode2:Design of concrete structures.General rules and rules for buildings:BS-EN-1992-1-1[S].London:European Committee for Standardization,2004.
[11]中华人民共和国交通部.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTGD 62-2004[S].北京:人民交通出版社,2004.
[12]中华人民共和国水利部.水工结构混凝土设计规范:SL191-2008[S].北京:中国标准出版社,2008.
[2]中华人民共和国水利电力部.水工钢筋混凝土结构设计规范:SDJ 20-78[S].北京:中国标准出版社,1978.
[3]中华人民共和国电力工业部.水工结构混凝土设计规范:DL/T 5057-1996[S].北京:中国标准出版社,1996.
[4]干城.水工大体积矩形截面纯弯构件的配筋计算[J].西北水电,1991(2):18-20.(GAN Cheng.Reinforcement calculation of large rectangular section pure bending members of hydraulic engineering[J].Northwest Hydropower,1991(2):18-20.(in Chinese))
[5]中华人民共和国国家能源局.水工结构混凝土设计规范:DL/T 5057-2009[S].北京:中国标准出版社,2009.
[6]周氐,陈礼和.水工钢筋混凝土构件最小配筋率的研究[J].河海大学学报(自然科学版),1992,20(1):44-51.(ZHOU Di,CHEN Lihe.Study on the Minimum Reinforcement Ratio of Hydraulic Reinforced Concrete Members[J].Journal of Hohai University(Natural Sciences),1992,20(1):44-51.(in Chinese))
[7]中华人民共和国住房和城乡建设部.混凝土结构设计规范(2015年版):GB 50010-2015[S].北京:中国建筑工业出版社,2015.
[8]中华人民共和国交通运输部.水运工程混凝土结构设计规范:JTS 151-2011[S].北京:人民交通出版社,2011.
[9]American Concrete Institute.Building Code Requirements for Structural Concrete:ACI 318-14[S].Farmington Hills:American Concrete Institute,2014.
[10]European Committee for Standardization.2004 Eurocode2:Design of concrete structures.General rules and rules for buildings:BS-EN-1992-1-1[S].London:European Committee for Standardization,2004.
[11]中华人民共和国交通部.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTGD 62-2004[S].北京:人民交通出版社,2004.
[12]中华人民共和国水利部.水工结构混凝土设计规范:SL191-2008[S].北京:中国标准出版社,2008.