Parameter Analysis And Prestress Optimization Of Long Span Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge is very competitive in the 200m span bridge, which is of good structural integrity, comfortable driving environment, attractive appearance and good economy. Parameter design (the curve power law on the bottom of beam, hole-span ratio, high-span ratio etc) and prestress design is an important part of the rigid frame bridge design. This paper focuses on these areas, expand the analysis to provide a reference for the design of rigid frame bridge. This paper completed the following tasks:This paper studied the effects of beam shape with different bottom line on the rigid frame bridge, including the effects of structural dimensions and internal force; summarized some hole-span ratio data, and then analysed its effects on the structure; summarized some high-span ratio data, and then analyzed the influence of the value of the high-span ratio on the rigid frame bridge.This article studied some of the major factors that may affect the mid-span deflection of the rigid frame bridge, including the effects of creep coefficient expressions, humidity, loading age etc; the effects of prestress loss of roof and floor; the effects of the crack of the beam; the effects of the concrete overweight of the main beam. And then took some measures to prevent mid-span deflecting.Introduced the basic principles of prestress arrangement, outlined a general method to optimize the prestress, including the method of configuring prestress based on stage, the method based on the degree of prestress, the method of configuring prestress in and out of the beam. The most important is successfully applied two optimization methods on Sun Ziyan Bridge, it is worth the subsequent prestress optimization of rigid frame bridge learning.