Papers by Author: Yu Xiang Liu

Abstract: By directing at the current situation of excessive midspan deflection in prestressed concrete continuous bridge during the past few years, this paper raised a calculation method to elevate the pre-camber. Factors that affect bridge alignment after the bridge is completed were treated as uniform load, test data about the existing bridge were set as the basis, quartic polynomial function was adopted to fit the pre-camber of bridge under construction, and the following conclusions were gained through simulation analysis on the bridge: 1) During calculation for construction pre-camber, this method can overcome or weaken the situation of excessive midspan deflection when the bridge is at operation stage; 2) It can reduce detail analysis on displacement caused by concrete creep and automobile load after the bridge is completed; 3) Relevant parameters are introduced to calculate predicted value of midspan deflection and make calculation for empirical pre-camber more rigorous; 4) Its feasibility has been verified through calculation to guarantee load carrying safety in bridge construction and operation process, so it has relatively high promotion and application values.

Abstract: A four span curved HcontinuousH HboxH-girder bridge is used as an engineering example to investigate the effect of radius of curvature on the seismic response of curved bridge. Numerical models with different radii of curvature are created using the finite element analysis program Midas/Civil. The calculation results obtained from response spectrum method show that radius of curvature is an important parameter to curved bridge. When the radius of curvature is large enough, the relationship between seismic response of main girder and radius is approximately linearity, while nonlinear variation is obtained when the radius is not too large. Finally, conclusions are made that seismic design of Hstraight bridgeH unHfoldHed from curved bridge which radius of curvature is specified could Hsatisfy the engineering Hrequirement.