一、预应力混凝土梁拱度的形成预应力混凝土梁的钢丝束,主要配置在梁体下部,在施加预应力后,梁体下部混凝土建立预压应力,使梁体跨中产生负弯矩,并引起梁体中部上拱,致使脱离台座。梁体自重将产生下挠,但一般很小,不能互相抵消,梁体仍然是向上拱的。梁体所以上拱,主要是梁体偏心受压,产生负弯矩的作用,下部 First, the formation of prestressed concrete beam arch The prestressed concrete beam steel wire bundle, mainly configured in the lower part of the beam body, after the prestressed, the lower part of the concrete beam to establish pre-stress, so that the beam across the negative moment, And cause the middle of the beam arch, resulting from the pedestal. Beam body weight will produce under the deflection, but generally small, can not offset each other, the beam is still up arch. Therefore, the beam arch, the main beam is eccentric compression, resulting in the role of negative moments, the lower part