纵向预应力损失对跨中挠度的影响

Effects on Mid-span Deflection of Longitudinal Pre-stress Loss

目前大跨度连续刚构桥跨中下挠过大已成为普遍现象.挠度过大,影响行车的安全性,降低桥梁的使用寿命,严重影响了大跨度连续刚构桥的发展.针对这个问题,研究了纵向预应力对跨中下挠的影响,采用MIDAS建立了空间模型,分析了预应力损失对桥梁变形的影响,对大跨度连续刚构桥的设计指明了方向.

Out size deflection of the mid-span has become a normal phenomenon in big-span continuous steel structural bridge. Outsize deflection not only affects traffic safety, but also reduces the service life of the bridge, which would affect the development of big span continuous steel structural bridge. This paper mainly studies the effects on the mid-span deflection of the longitudinal pre-stress and analyses effects on bridge deformation of pre-stress loss by establishing a space model with MIDAS, pointing out the direction of the design of big span continuous steel structural bridge.