Displacement model error-based method for symmetrical cable-stayed bridge performance warning after eliminating variable load effects

2021 ◽  
Author(s):  
Yan Wang ◽  
Dong-Hui Yang ◽  
Ting-Hua Yi
Keyword(s):  
Model Error ◽  
Variable Load ◽  
Cable Stayed Bridge ◽  
Load Effects ◽  
Bridge Performance ◽  
Displacement Model

scholarly journals Effect of blast loading and resulting progressive failure of a cable-stayed bridge

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Ravi Mudragada ◽  
S. S. Mishra
Keyword(s):  
Progressive Failure ◽  
Blast Resistance ◽  
Progressive Collapse ◽  
Building Structures ◽  
Structural Elements ◽  
Blast Loads ◽  
Cable Stayed Bridge ◽  
Bridge Performance ◽  
Cable Stayed Bridges

AbstractMany researchers have carried out experimental and numerical investigations to examine building structures’ response to explosive loads. Studies of bridges subjected to blast loads are limited. Hence, in this study, we present a case study on a cable-stayed bridge, namely, Charles River Cable-Stayed Bridge-Boston, to assess its robustness and resistance against the progressive collapse resulting from localized failure due to blast loads. Three different blast scenarios are considered to interpret the bridge performance to blast loads. To monitor the progressive failure mechanisms of the structural elements due to blast, pre-defined plastic hinges are assigned to the bridge deck. The results conclude that the bridge is too weak to sustain the blast loads near the tower location, and the progressive collapse is inevitable. Hence, to preserve this cable-stayed bridge from local and global failure, structural components should be more reinforced near the tower location. This case study helps the designer better understand the need for blast resistance design of cable-stayed bridges.

Probabilistic evaluation of maximum dynamic traffic load effects on cable-supported bridges under actual heavy traffic loads

2020 ◽  
pp. 1748006X2093849
Author(s):  
Yang Liu ◽  
Qinyong Wang ◽  
Naiwei Lu
Keyword(s):  
Heavy Traffic ◽  
Suspension Bridge ◽  
Traffic Monitoring ◽  
Traffic Load ◽  
Dynamic Traffic ◽  
Type Distribution ◽  
Cable Stayed Bridge ◽  
Weigh In Motion ◽  
Load Effects ◽  
Motion Measurements

The traffic load has grown significantly in recent years, which might be a threat for the service safety of existing bridges. Thus, it is an urgent task to assess the actual traffic load effects on bridges, considering actual heavy traffic load instead of design traffic load. This study presents a framework for extrapolating maximum dynamic traffic load effects on large bridges using site-specific traffic monitoring data. The framework involves vehicle–bridge interaction analysis and probabilistic modelling of extreme values. The weigh-in-motion measurements of a busy highway in China were collected for stochastic traffic load modelling. Case studies of two long-span cable-supported bridge based on the weigh-in-motion measurements were conducted to demonstrate the effectiveness of the proposed framework. It is demonstrated that Rice’s level-crossing approach can capture both dynamic and probabilistic characteristics of the traffic load effects. The root-mean-square displacement of the cable-stayed bridge follows a C-type distribution, and the one for the suspension bridge follows an M-type distribution, which is associated with the first-order mode shapes of the two types of bridges. The amplification factors for the cable-stayed bridge and the suspension bridge are 5.9% and 3.6%, respectively. The numerical analysis indicates that the dynamic effect for extrapolation is weaker with the increase in bridge span length, but the effect of traffic volume growth will be more significant.

Overlay Replacement Feasibility Study of the Burlington Cable Stayed Bridge

2019 ◽  
Author(s):  
Yinghong Cao ◽  
Gregory Hasbrouck ◽  
Robert A. Magliola ◽  
Michael J. Todsen
Keyword(s):  
Mississippi River ◽  
Original Design ◽  
Significant Deterioration ◽  
Cable Stayed Bridge ◽  
Stay Cables ◽  
Main River ◽  
Local Stresses ◽  
Load Effects ◽  
Design Loads

<p>The Burlington Bridge, built in 1993, spans over the Mississippi River at Burlington, Iowa. The main river crossing is a 379‐m‐long cable stayed bridge carrying two westbound lanes and three eastbound lanes of U.S. Route 34. After 25 years of service, the concrete overlay and barrier are planned for replacement due to deterioration and cracking. This paper presents the methodology of the feasibility analysis for the replacement plan. Based on recent inspection reports, no significant deterioration of the primary structural elements of the bridge was found that would reduce the capacity of the structure to accommodate the original design loads. Without in‐depth determination of the capacity of the existing structure, the feasible construction staging was evaluated by comparing the effect of construction activities with the design live load effects. Various construction staging alternatives with reduced traffic lanes were investigated and optimized. The load effects on the primary structural components including towers, stay cables, edge girders, floor beams, deck and bearings were the main targets of comparison. Both global structural behavior and local stresses on these members were analyzed. After the analytical study, the most favorable construction staging was proposed for further consideration and refinement.</p>

Reduced model error analysis “application to synchronous machines"

1994 ◽  
Vol 4 (10) ◽  
pp. 1999-2012 ◽  
Author(s):  
Nabil Derbel ◽  
Mohamed B.A. Kamoun ◽  
Michel Poloujadoff
Keyword(s):  
Error Analysis ◽  
Model Error ◽  
Synchronous Machines ◽  
Reduced Model ◽  
Analysis Application
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