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李唐寧 賀湘華
（重慶大學(xué)土木工程學(xué)院 400045）[提要] 較大預(yù)應(yīng)力筋孔道給預(yù)應(yīng)力框架柱造成較大的截面削弱，對框架柱的承載能力是否存在不利影響一直是設(shè)計人員擔(dān)心的問題。對三個帶有預(yù)應(yīng)力筋孔道的框架柱（一個未灌漿和兩個已灌漿）和一個沒有孔道的框架柱進(jìn)行了軸心受壓狀態(tài)下極限承載能力的對比試驗。試驗結(jié)果表明，預(yù)應(yīng)力筋孔道面積不超過梁柱截面面積的25%時，在軸心受壓狀態(tài)下，單向留設(shè)的預(yù)應(yīng)力筋孔道對框架柱的極限承載能力影響不大。
[關(guān)鍵詞] 預(yù)應(yīng)力混凝土 框架柱 極限承載能力 預(yù)應(yīng)力筋孔道The influence of the ducts for tendons or strands weakening the section of frame column is a question in the PPC design. A contrast experimental research of three frame columns with two one-way placed ducts for tendons or strands( two fillecl with grout and the other without grout)and one without any ducts is presented. The results show that the influence of those ducts to the ultimate bearing capacity of the weakened section of the column is not serious, when the total section area of the ducts is not beyond 25 percent of the cross-sectional area of the column under axes-pressure.
Keywords: PPC; frame column; ultimate bearing capacity; ducts; tendons; strands
