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【提要】  對體外預(yù)應(yīng)力混凝土梁的使用性能進行研究，探討其剛度和裂縫的計算方法。考慮到體外索對構(gòu)件剛度和控制裂縫的貢獻較相同數(shù)量的有粘結(jié)筋小的特點，參照相關(guān)文獻，提出體外索等效折減系數(shù)為020，從而實現(xiàn)體外預(yù)應(yīng)力與有粘結(jié)預(yù)應(yīng)力混凝土梁剛度和裂縫計算公式的統(tǒng)一。試驗結(jié)果表明，運用該方法計算體外預(yù)應(yīng)力混凝土梁的剛度和裂縫與試驗結(jié)果吻合良好。
【關(guān)鍵詞】  體外預(yù)應(yīng)力  混凝土梁  剛度  撓度  裂縫
Calculation Study on Stiffness and Crack of Externally Prestressed Concrete Beam/Xiong Xueyu1,2，Wang Shousheng3（1 Prestressed Institute，TongjiUniversity,Shanghai 200092,China；2 Key Laboratory of Advanced Civil Engineering Materials,Tongji University,Shanghai 200092,China；3 Shanghai Municipal Engineering Design Institute,Shanghai 200092,China）
Abstract:The working performance of externally prestressed concrete beam is studied, and
the calculation methods of stiffness and crack are summarized and analyzed.  Therecommended value of the equivalent reduced coefficient of external tendon is 020, considering its contributions to stiffness and restraint to crack,which is smaller than that of bonded ones, and the results show good coincidence.
Keywords:external prestressing;  concrete beam;  stiffness;  deflection;   crack
1)同濟大學(xué)預(yù)應(yīng)力研究所，上海，200092；2)先進土木工程材料教育部重點實驗室（同濟大
學(xué)），上海，200092；3)上海市政工程設(shè)計研究總院，200092。
*《建筑結(jié)構(gòu)體外預(yù)應(yīng)力加固技術(shù)規(guī)程》和上海市《預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計規(guī)程》（修訂）研究項目，上海市建設(shè)技術(shù)發(fā)展基金（B05043）資助項目。