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     熊學(xué)玉  趙  勇
    （同濟(jì)大學(xué)預(yù)應(yīng)力研究所 上海 200092）

[提要]  基于作者創(chuàng)立的約束次內(nèi)力法進(jìn)行對(duì)稱雙坡預(yù)應(yīng)力混凝土框架分析，給出了對(duì)稱雙坡預(yù)應(yīng)力變剛度梁單元的剛度矩陣及梁端的約束次內(nèi)力的計(jì)算公式。計(jì)算實(shí)例表明，對(duì)于對(duì)稱雙坡預(yù)應(yīng)力混凝土框架，不考慮軸向變形影響時(shí)往往會(huì)產(chǎn)生較大的計(jì)算誤差。
[關(guān)鍵詞]  預(yù)應(yīng)力混凝土 變剛度梁 約束次內(nèi)力法 雙坡對(duì)稱矩形梁

The symmetric double-sloping PRC-frame is analyzed on the basis of method for restraining secondary internal force advanced by the author. The calculating formulae of rigidity matrix and secondary internal force at the end of beam for prestressed element with varying rigidity are presented. The calculating example shows that the symmetric double-slopping PRGframe will produce biggish calculating error if the axial deformation is ignored.
Keywords:  prestressed concrete; varying rigidity; restraining secondary internal force; symmetric double-slopping beam; rectangle section