- 摘 要
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(1鄭州大學(xué)土木工程學(xué)院 450002；2河南省機(jī)關(guān)事務(wù)管理局 鄭州 450000)
【提要】 作為鋼筋延性標(biāo)志的伸長率，長期以來用斷口伸長率表達(dá)，但其只是局部區(qū)域的殘余伸長，難以代表鋼筋真正的變形能力。鋼筋在最大力下的總伸長率(均勻伸長率)才是鋼筋變形能力的真正代表。通過試驗(yàn)研究及調(diào)查統(tǒng)計(jì)，明確了目前我國傳統(tǒng)的以斷口延伸率反映鋼筋延性所存在的缺陷，探討了以鋼筋均勻伸長率作為鋼筋延性指標(biāo)的意義及鋼筋均勻伸長率簡易測量方法，同時在仔細(xì)比較國外先進(jìn)的混凝土結(jié)構(gòu)規(guī)范對鋼筋延性需求指標(biāo)的基礎(chǔ)上，建議用均勻伸長率代替斷口伸長率，以真實(shí)地反映鋼筋的變形能力及延性，保證混凝土結(jié)構(gòu)
的延性要求。
【關(guān)鍵詞】 鋼筋混凝土結(jié)構(gòu) 鋼筋 延性 均勻伸長率
Investigation on Ductility Index of Steel in Conrete Structure/Guan Pinwu1,Liu Lixin1,Zhang Dayong2(1 School of Civil Eng.,Zhengzhou University,Zhengzhou 450002,China; 2 Government Office Administration of Henan Province,Zhengzhou 450000,China)
Abstract:The breaking elongation is the ductility index of the reinforcement in China,but it is only the resident elongation of broken region rather than the ductility of the reinforcement.The symmetrical elongation of reinforcements is introduced as the ductility index,and the simplified test method is also presented for popularizing in application.Based on the comparison of the ductility index of reinforcements in different countries codes in
detail,it is suggested that the symmetrical elongation is more rational than the breaking elongation as the ductility index of reinforcements in reinforced concrete structures.
Keywords:reinforcement;ductility;symmetrical elongation
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