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(中國(guó)建筑科學(xué)研究院建筑結(jié)構(gòu)研究所， 北京 100013)

［摘要］通過(guò)構(gòu)建無(wú)粘結(jié)預(yù)應(yīng)力混凝土受彎構(gòu)件極限狀態(tài)下的幾何分析模型，補(bǔ)充預(yù)應(yīng)力配筋極限伸長(zhǎng)量與構(gòu)件極限撓度的協(xié)調(diào)關(guān)系，推導(dǎo)了適用性較好的無(wú)粘結(jié)預(yù)應(yīng)力筋極限應(yīng)力σpu的解析算法。根據(jù)19根試件的彎曲破壞試驗(yàn)數(shù)據(jù)，對(duì)σpu的解析計(jì)算值與相應(yīng)實(shí)測(cè)值進(jìn)行了比較，驗(yàn)證了兩者的一致性。為便于讀者理解與應(yīng)用，分析說(shuō)明了所述算法中的關(guān)鍵參數(shù)。相對(duì)目前結(jié)構(gòu)設(shè)計(jì)普遍采用近似經(jīng)驗(yàn)方法確定σpu，所提出的算法可供無(wú)粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)的規(guī)范修訂、配筋設(shè)計(jì)、軟件更新與課題研究參考。

［關(guān)鍵詞］混凝土受彎構(gòu)件； 無(wú)粘結(jié)預(yù)應(yīng)力筋； 極限拉應(yīng)力； 幾何分析模型； 協(xié)調(diào)變形條件； 極限撓度； 解析算法

中圖分類(lèi)號(hào)：TU378-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)03-0061-05

Analytical algorithm for ultimate stress of unbonded prestressed tendons in concrete flexural members

Pan Li

（Institute of Building Structures, China Academy of Building Research, Beijing 100013, China）

Abstract:Based on the established geometric analysis model of unbonded prestressed concrete members in ultimate flexural state, the coordinated relationship between the ultimate elongation of the prestressing tendons and the ultimate deflection of the members was supplemented, and the analytical algorithm of the ultimate stress σpu of unbonded prestressing tendons with better applicability was deduced. Based on the flexural failure test data of 19 specimens, the analytical calculation value of σpu was compared with the corresponding measured value and the consistency of the two values was verified. In order to facilitate the reader′s understanding and application, the key parameters of the algorithm were analyzed and explained. Compared with the approximate empirical method commonly used in structural design to determine σpu, the proposed analytical algorithm could provide reference for the revision of code, reinforcement design, software updating and subject research of unbonded prestressed concrete structures.

Keywords:concrete flexural member; unbonded prestressed tendon; ultimate tensile stress; geometrical analysis model; coordinated deformation condition; ultimate deflection; analytical algorithm

作者簡(jiǎn)介：潘立,碩士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email: Panlicabr@163.com。