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    夏春紅  王玉起
    （天津大學(xué) 300072）

[提要]  通過(guò)對(duì)國(guó)內(nèi)外60根試驗(yàn)梁的分析，得出計(jì)算無(wú)粘結(jié)筋極限應(yīng)力的公式，具有較高的精度。由該公式可知，非預(yù)應(yīng)力筋對(duì)無(wú)粘結(jié)筋極限應(yīng)力的影響隨配筋強(qiáng)度比的增加發(fā)生改變。
[關(guān)鍵詞]  無(wú)粘結(jié)筋 極限應(yīng)力 預(yù)應(yīng)力筋 非預(yù)應(yīng)力筋 配筋指標(biāo) 配筋強(qiáng)度比

Based on the analyses of sixty experimental unbonded partially prestressed concrete beams at home and abroad, a formula for evaluating the ultimate stress in unbonded tendons, which has high accuracy, is proposed. The calculation results show the effect of nonprestressed steel on the ultimate stress of unbonded tendons changes with the increase of steel index ratio.
Keywords: ultimate stress; unbonded tendons; prestressing; nonprestressing; steel index ratio