不同束形配筋的预应力混凝土受扭梁的实验研究

EXPERIMENTAL STUDY ON PRESTRESSED CONCRETE BEAM WITH DEFERENT LAYOUT CABLES SUBJECTED TO TORSION

根据预应力筋等效荷载的基本原理,提出一种折线螺旋束型的预应力混凝土受扭梁。对配有折线螺旋形预应力筋的混凝土受扭梁与通常配有纵向预应力筋的混凝土受扭梁进行了加载试验。结果表明,折线螺旋形预应力筋有效地推迟了预应力混凝土构件扭转裂缝的出现,提高了构件的开裂扭矩和极限扭矩,并保持一定的延性。

A kind of prestressed concrete beam with spiral broken line cables subjected to torsion is present based on the principle of generalized equivalent loads of prestress cables. Load tests of the beam with spiral broken line cables and the general prestressed concrete beams with longitudinal cables are carried out. The results show that the spiral broken line cables effectively delayed the cracking of the beam and increased beth crack torsional moment and ultimate torsional moment, kept some ductility.