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通过比较GB 50010—2010《混凝土结构设计规范》和GB 50010—2002《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“x≥2a’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ξb值,并把上述修改后的假定和补充的ξb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。
By comparing GB 50010-2010 “Code for design of concrete structures” and GB 50010-2002 “Code for design of concrete structures”, it is found that when using the newly added HRB500 steel bars of the new code to calculate the double-bar rectangular section, the original calculation assumes that “x≥2a’s ”Does not make it possible for the stress in the compression zone to reach its strength design value, so a modification is made to this assumptions to make it better adapted to HRB500 reinforcement. At the same time, by using the relevant formulas and conditions that regulate the mid-section cross-section assumption, the value of ξb at the yield point reinforcement of the flexural members in construction is improved, and the modified assumptions and supplementary ξb values are applied to the double-rod rectangular section positive In the section bearing capacity calculation, through the example calculation and comparison, it is proved that the modified assumption has better adaptability and saves more total steel consumption.