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（1 同濟(jì)大學(xué)預(yù)應(yīng)力研究所， 上海 200092；2 同濟(jì)大學(xué)先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗(yàn)室， 上海 200092）
［摘要］通過研究無粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)極限應(yīng)力增量與結(jié)構(gòu)整體變形的關(guān)系，提出了一種基于撓度和支座轉(zhuǎn)角的無粘結(jié)預(yù)應(yīng)力筋極限應(yīng)力應(yīng)力增量的計(jì)算方法；并通過理論推導(dǎo)建立了預(yù)應(yīng)力筋極限應(yīng)力增量與跨中撓度和支座轉(zhuǎn)角的公式，進(jìn)而利用該計(jì)算公式統(tǒng)一了連續(xù)梁和簡支梁在不同荷載條件和約束分布下的計(jì)算。對比了國內(nèi)外142根試驗(yàn)梁（包括簡支梁和連續(xù)梁）極限應(yīng)力增量的試驗(yàn)結(jié)果和各計(jì)算方法計(jì)算所得的結(jié)果，結(jié)果表明，本文計(jì)算方法計(jì)算得到的結(jié)果與試驗(yàn)結(jié)果的吻合程度較高，這說明本文計(jì)算方法具有較為廣泛的適用性。
［關(guān)鍵詞］無粘結(jié)筋； 極限應(yīng)力增量； 跨中撓度； 支座轉(zhuǎn)角
中圖分類號：TU378-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)08-0024-05
Research on ultimate stress increment of unbonded tendon in partially prestressed concrete beam base on overall structure deformation
Xiong Xueyu1,2, Wu Tao1
(1 Institute of Prestressed Structures, Tongji University, Shanghai 200092, China; 2 Key Laboratory of Advanced Civil Engineering Materials(Tongji University), Ministry of Education, Shanghai 200092, China)
Abstract:Based on the study of the relationship between the ultimate stress increment of unbonded prestressed concrete structures and the overall structural deformation, a method to calculate the stress increment of ultimate stress of unbonded prestressed tendons based on deflection and bearing rotation angle was proposed. The formula of ultimate stress increment, mid-span deflection and bearing rotation angle of prestressing tendons were deduced theoretically. Then, the calculation formulas of continuous beam and simply supported beam under different loading conditions and constraint distributions were unified. The experimental results of the ultimate stress increment of 142 test beams (including simply supported beams and continuous beams) at home and abroad were compared with those calculated by some calculation methods. The results show that the experimental results and calculation results calculated by the proposed calculation method agree well, which shows that the proposed calculation method is widely applicable.
Keywords:unbonded tendon; ultimate stress increment; mid-span deflection; bearing rotation angle
作者簡介：熊學(xué)玉，博士，教授，博士生導(dǎo)師，Email: xueyu@ #edu.cn。
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