Evaluating Reserve Strength of Girder Bridges Due to Bridge Rail Load Shedding

This research experimentally and numerically evaluated the reserve strength of girder bridges due to bridge rail load shedding. The investigation included: (1) performing non-destructive field testing on two steel girder bridges and one prestressed concrete girder bridge, (2) developing validated finite element numerical models, and (3) performing parametric numerical investigations using the validated numerical modeling approach. Measured data indicated that intact, integral, reinforced concrete rails participate in carrying live load. Research results culminated in recommendations to evaluate the reserve strength of girder bridges due to the participation of the rail, as well as recommendations for bridge inspectors for evaluating steel girder bridges subjected to vehicular collision.

Seismic Retrofit of a Multispan Prestressed Concrete Girder Bridge with Friction Pendulum Devices

The paper deals with the proposal and application of a procedure for the seismic retrofit of an existing multispan prestressed concrete girder bridge defined explicitly for the use of friction pendulum devices as an isolation system placed between piers top and deck. First, the outcomes of the seismic risk assessment of the existing bridge, performed using an incremental noniterative Nonlinear Static Procedure, based on the Capacity Spectrum Method as well as the Inelastic Demand Response Spectra, are described and discussed. Then, a specific multilevel design process, based on a proper application of the hierarchy of strength considerations and the Direct Displacement-Based Design approach, is adopted to dimension the FPD devices. Furthermore, to assess the impact of the FPD nonlinear behaviour on the bridge seismic response, a device model that reproduces the variation of the normal force and friction coefficient, the bidirectional coupling, and the large deformation effects during nonlinear dynamic analyses was used. Finally, the paper examines the effects of the FPD modelling parameters on the behaviour of the retrofitted bridge and assesses its seismic response with the results pointing out the efficiency of the adopted seismic retrofit solution.

Comparative Analysis on Main Material index of China and International Composite Girder Bridge with Corrugated Steel Web

<p class="p1"><span class="s1">Prestressed Concrete girder bridge with corrugated steel web is type of girder bridge that evolve rapidly in recent year, its excellent mechanical properties is getting more and more recognition by majority of the bridge engineers. This article investigate the case study of constructed girder bridge with corrugated steel webs in China, analyze and give comment based on their construction design, technology and etc. With the data of constructed girder bridge with corrugated steel webs in Japan, comparative analysis of the main material index of China and Japan girder bridge with corrugated steel webs was compared, the material index function was developed to ease the estimation of related construction.</span></p>

Comparative Analysis on Main Material index of China and International Composite Girder Bridge with Corrugated Steel Web

<p class="p1"><span class="s1">Prestressed Concrete girder bridge with corrugated steel web is type of girder bridge that evolve rapidly in recent year, its excellent mechanical properties is getting more and more recognition by majority of the bridge engineers. This article investigate the case study of constructed girder bridge with corrugated steel webs in China, analyze and give comment based on their construction design, technology and etc. With the data of constructed girder bridge with corrugated steel webs in Japan, comparative analysis of the main material index of China and Japan girder bridge with corrugated steel webs was compared, the material index function was developed to ease the estimation of related construction.</span></p>