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DISCUSSION ON THE DESIGN ASSUMPTION OF DOUBLE REINFORCED RECTANGLE SECTION RC BEAM ACCORDING TO THE NEW CODE FOR DESIGN OF CONCRETE STRUCTURE
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摘要: 通过比较GB 500102010《混凝土结构设计规范》和GB 500102002《混凝土结构设计规范》,发现在使用新规范新增的HRB500钢筋计算双筋矩形截面时,原计算假定x2a's并不能使受压区钢筋应力达到其强度设计值,因此通过计算分析并对此假定提出修改,以更好地适应HRB500钢筋。同时,利用规范中平截面假定的相关公式和条件,完善建筑工程受弯构件有屈服点钢筋配筋时的b值,并把上述修改后的假定和补充的b值运用到双筋矩形截面正截面承载力计算中,通过实例计算和比较,证明修改后的假定有更好的适应性并且更节省总用钢量。Abstract: The new and old codes for design of concrete structure were compared in this paper,the results showed that the accounting assumption x 2a'swas not available for the new HRB500 bar in the design of double reinforcement rectangle section RC beam,the compressive reinforcement can not reach design value,so a fixed assumption was raised to fit for HRB500 bar. Meanwhile,b was supplemented under correlative formulas and terms of assumption of plane section. When the aboved assumption and b were applied in the design of double reinforcement rectangle section RC beam,the results and analysis proved that the fixed assumption was more adaptive and created less total steel consumption.
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[2] GB 500102002 混凝土结构设计规范[S]. GB 500102010 混凝土结构设计规范[S]. [3] 东南大学, 同济大学, 天津大学. 混凝土结构设计原理[M].北京:中国建筑工业出版社, 2008:56-61. [4] 沈蒲生, 梁兴文. 混凝土结构设计原理[M].北京:高等教育出版社, 2002:83-85. [5] 沈蒲生, 罗国强. 混凝土结构疑难释义[M].北京:中国建筑工业出版社, 2003:34-36. [6] 郭月峰, 黄国兴. 平截面假定及其应用[J].建筑结构, 1999(3):34-36. [7] ACI 318M-05 Building Code Requirements for StructuralConcrete and Commentary[S]. -
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