李唐宁    贺湘华
    （重庆大学土木工程学院 400045）

[提要]  较大预应力筋孔道给预应力框架柱造成较大的截面削弱，对框架柱的承载能力是否存在不利影响一直是设计人员担心的问题。对三个带有预应力筋孔道的框架柱（一个未灌浆和两个已灌浆）和一个没有孔道的框架柱进行了轴心受压状态下极限承载能力的对比试验。试验结果表明，预应力筋孔道面积不超过梁柱截面面积的25%时，在轴心受压状态下，单向留设的预应力筋孔道对框架柱的极限承载能力影响不大。
[关键词]  预应力混凝土  框架柱  极限承载能力  预应力筋孔道

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