Seismic Performance Research of Steel Girder Bridge with Isolation Bearings and Restrainer Cables

2013 ◽  
Vol 353-356 ◽  
pp. 2000-2003
Author(s):  
Peng Zhang ◽  
Cui Ping Pang ◽  
Min Yuan ◽  
Wan Wen Wang
Keyword(s):  
Seismic Performance ◽  
Seismic Isolation ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Lead Rubber Bearings ◽  
Steel Girder Bridge ◽  
Girder Bridge ◽  
Rubber Bearings ◽  
Existing Bridges

The seismic performance of multi-span simply supported steel-girder bridges with sliding and high rocker steel bearings is poor during earthquakes. During the past 20 years, seismic isolation has emerged as one of the most promising strategy for improving the seismic performance of existing bridges. In this study elastomeric bearings, lead-rubber bearings, and cable restrainers are attempted to modify the seismic response of bridges, and theirs effects are analyzed and compared.

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

2021 ◽  
Author(s):  
Yao Wang ◽  
Mirela D. Tumbeva ◽  
Ashley P. Thrall
Keyword(s):  
Prestressed Concrete ◽  
Numerical Models ◽  
Field Testing ◽  
Load Shedding ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Girder Bridge ◽  
Prestressed Concrete Girder Bridge ◽  
Reserve Strength

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.

Experimental Investigation on the Fatigue Strength of the Replacement Repair Welded Joints

2007 ◽  
Vol 345-346 ◽  
pp. 355-358
Author(s):  
Kyong Ho Chang ◽  
H.C. Park ◽  
Chin Hyung Lee ◽  
Gab Chul Jang ◽  
E.H. Choi
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Steel Plate ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Flux Cored Arc Welding ◽  
Girder Bridge

In recent years, the replacement repair welding, which repairs damaged steel girder bridges by replacement of the damaged sections with new steel plates through cutting and welding under in-service conditions, is spotlighted for its brilliant features, i.e. it can be achieved without incurring traffic dislocation. However, the mechanical behavior of the welded joints under cyclic loads due to the traffic which passes along the girder bridges is not clarified. In this paper, the fatigue strength of the replacement repair welded joints was investigated in order to improve reliability in the repair welded joints. Steel plate was extracted from the old steel girder bridge; then was welded with new steel plate to construct specimen with the replacement repair welded joints. Flux Cored Arc Welding (FCAW) process was used to fabricate the double "V" butt joints. Fatigue tests were conducted using a servo hydraulic controlled 50tonf capacity UTM with a frequency of 5Hz under constant amplitude loading. The fatigue strength of the replacement repair welded joints was analyzed in detail.

scholarly journals Effect of Cross-Frames on Load Distribution of Steel Bridges with Fractured Girder

2020 ◽  
Vol 5 (4) ◽  
pp. 32 ◽  
Author(s):  
Mohammad Abedin ◽  
Armin B. Mehrabi
Keyword(s):  
Load Distribution ◽  
Steel Plate ◽  
Steel Girder ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Solution Methods ◽  
Profile Changes ◽  
Girder Bridge ◽  
The Impact ◽  
Sudden Collapse

In steel girder bridges, fracture of one girder may occur without noticeable bridge profile changes. It is critical to ensure that the bridge will have adequate capacity to prevent collapse until the next cycle of inspection discovers the damage. It is realized that once one of the bridge girders is fractured, vertical loads need to be distributed through an alternative path to the intact girder(s). In this case, cross-frames can play an important role in transferring the loads and preventing from sudden collapse. This paper investigates the impact of cross-frames on load distribution after a fracture is occurred in one girder. Bridge configurations with different cross-frame spacing were studied using finite element modeling and simulation of the bridge behavior with a fractured steel plate girder. Nonlinear and dynamic solution methods were used for these analyses. Results of this investigation demonstrated the important role cross-frames can play in providing some reserved capacity for the bridge with fractured girder to enhance the bridge redundancy. The contribution of the cross-frames and the behavior of the bridge after fracture in one girder however depends on the configuration of the bridge. A study of the variation of the effect of cross-frames with respect to the number of girders is also included in this paper.

Seismic performance of a two-span steel girder bridge with ABC connections

2021 ◽  
Vol 241 ◽  
pp. 112502
Author(s):  
Elmira Shoushtari ◽  
M. Saiid Saiidi ◽  
Ahmad Itani ◽  
Mohamed A. Moustafa
Keyword(s):  
Seismic Performance ◽  
Steel Girder ◽  
Steel Girder Bridge ◽  
Girder Bridge
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