16.30: Safety evaluation of a large-span double-deck cable-stayed steel bridge under fire

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 4283-4292 ◽  
Author(s):  
Yushu Liu ◽  
Guobiao Lou ◽  
Xiaochen Ju ◽  
Xiaoguang Liu
Keyword(s):  
Safety Evaluation ◽  
Steel Bridge ◽  
Large Span

EFFECT OF THE DEGREE OF RESTRAINT AGAINST THERMAL EXPANSION AND CONTRACTION ON WELDING RESIDUAL STRESS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4075-4080
Author(s):  
SANG-HYONG LEE ◽  
KYONG-HO CHANG ◽  
GAB-CHUL JANG
Keyword(s):  
Residual Stress ◽  
Evaluation Method ◽  
Safety Evaluation ◽  
Residual Stress Distribution ◽  
Welding Residual Stress ◽  
Steel Bridge ◽  
Repair Work ◽  
Vehicle Load ◽  
Degree Of Restraint ◽  
A Chain

Steel bridges increased considerably since 1960's in Japan. That is due to the lightness and long trend in bridge construction. Bridges, which are damaged by an increase in vehicle load, corrosion, earthquake, and so on, need repairing or strengthening. Repair procedures of steel bridge generally include cutting, bolting and welding procedures. These procedures, cutting, bolting and welding, occasionally bring about a stress concentration within the limit range. So, a chain of confirmation against the safety of structure is necessary. A safety evaluation method, which has regard to heat effect, is necessary to repair damaged structure with welding. Generalized welding residual stress is useful employ, to estimate the safety of structure during the repair work with welding. This research investigates the features of thermal stress generated by welding. The pattern of welding residual stress distribution was classified according to the ratio between length and width of plate. With those results, the features of residual stress generated by welding were generalized.

Field Test of a Large-Span Soil–Steel Bridge Stiffened by Concrete Rings during Backfilling

2017 ◽  
Vol 22 (10) ◽  
pp. 06017002 ◽  
Author(s):  
Alireza Sanaeiha ◽  
Mohammad Rahimian ◽  
Mohammad Sadegh Marefat
Keyword(s):  
Field Test ◽  
Steel Bridge ◽  
Large Span

scholarly journals Numerical Simulation of Fatigue Performance of Diaphragm of Large-Span Bridge Orthotropic Deck

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Hui Li ◽  
Bo Zhao ◽  
Han Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Fatigue Life ◽  
Finite Element Model ◽  
Element Model ◽  
Life Assessment ◽  
Steel Bridge ◽  
Large Span ◽  
Finite Element Software ◽  
Fatigue Life Assessment

Under traffic loads, orthotropic steel bridge slabs suffer from an obvious fatigue problem. In particular, fatigue cracking of diaphragms seriously affects application and development of orthotropic bridge slabs. In the paper, based on cracking status quo of an orthotropic deck diaphragm of a large-span bridge, experimental tests were formulated to test stress distribution states of the diaphragm. The finite element software ABAQUS was used to establish a finite element model of the orthotropic deck diaphragm; numerical simulation was conducted on the basis of the experiments. Simulation results were compared with experimental results, so correctness of the finite element model was verified. Finally, Local Strain Approach (LSA) and Theory of Critical Distance (TCD) were used to conduct life assessment of the orthotropic deck diaphragms, and applicability of two methods was discussed. In this way, a fatigue life assessment method with high accuracy and good operability was provided for fatigue life assessment of orthotropic deck diaphragms.

Innovation design of a ballastless cable-stayed bridge with main span of 300m in high-speed railway

2018 ◽  
Author(s):  
Li Diping
Keyword(s):  
Composite Beam ◽  
High Speed ◽  
Technical Problem ◽  
Local Deformation ◽  
Structure Design ◽  
Steel Bridge ◽  
High Speed Railway ◽  
Large Span ◽  
Cable Stayed Bridge ◽  
Ballastless Track

<p>Right now, for bridges paved with ballastless track on high-speed railway with operating speed of 350km per hour in the world, the maximum span is 185m, and larger span bridges are all paved with ballasted track. The speed of the train passing through the large span bridge has to be limited to be not more than 250km per hour, which becomes a neck for high-speed trains running on the whole line. Laying ballastless track on large span bridges has become a technical problem to expand application range of ballastless track. This paper is based on a cable-stayed bridge with main span of 300m. For this bridge, prestressed concrete box girders are used for edge span and box steel-concrete composite beam is used for mid-span. Cable-stayed bridge is a flexible structure, and the stiffness must be the problem to be solved first for high-speed railway. The hybrid girder and the composite beam for the middle span can increase the deadweight stiffness. Relative to the steel bridge deck, concrete deck has larger stiffness and smaller local deformation, which makes it more conducive to high-speed traffic. The technology of laying ballastless track in the concrete slabis mature. This bridge is the first cable-stayed bridge paved with ballastless track on high-speed railway with design speed of 350km per hour in our country. This paper focuses on the conception, structure design and innovation points of the bridge. And the adaptability of high-speed railway ballastless track to the bridge is also analyzed.</p>

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