Motion-Dependent Forces on Streamlined Bridge Girders and Their Influencing Parameters – Observations from Wind Tunnel Buffeting Response Data

2019 ◽  
pp. 387-401
Author(s):  
J. B. Jakobsen
Keyword(s):  
Wind Tunnel ◽  
Bridge Girders ◽  
Buffeting Response ◽  
Response Data ◽  
Influencing Parameters

Wind Tunnel Test and the Analysis of Buffeting Performance of Free-Standing Tower of Cable-Stayed Bridge under Yaw Wind

2012 ◽  
Vol 532-533 ◽  
pp. 215-219
Author(s):  
Guo Hui Zhao ◽  
Yu Li ◽  
Hua Bai
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Free Standing ◽  
Buffeting Response ◽  
Cable Stayed Bridge ◽  
Aeroelastic Model ◽  
Navigation Channel ◽  
Yaw Angle

The buffeting performance of free-standing tower of JiangHai Navigation Channel Bridge, a cable-stayed bridge, under yaw wind is investigated by means of wind tunnel test of aeroelastic model. It is found that the variation of buffeting response of free-standing tower with wind yaw angle is not monotonous. The lateral buffeting response on the top of the free-standing tower reach their minimal values and maximal values at around 150°and 180°of wind yaw angle respectively and the longitudinal buffeting response attain their maximal values at around 90°of wind yaw angle. Also, at the 2/3 height of the tower the lateral buffeting response and torsional buffeting response get their minimal values at around 150°of wind yaw angle, and at around 180°achieve the maximal values. It is also seen that, the buffeting response changes with the wind speed at a conic curve approximately.

Wind Tunnel Investigations for the Free Standing Tower of the Penang Second Bridge

2012 ◽  
Vol 256-259 ◽  
pp. 1577-1581
Author(s):  
Nan Luo ◽  
Ai Xia Liang ◽  
Hai Li Liao ◽  
Mei Yu
Keyword(s):  
Wind Tunnel ◽  
Vortex Shedding ◽  
Wind Tunnel Testing ◽  
Test Results ◽  
Free Standing ◽  
Turbulent Wind ◽  
Buffeting Response ◽  
Acceptable Range ◽  
Aeroelastic Model ◽  
Under Construction

The Penang Second Bridge is a new bridge under construction in Penang, Malaysia. The aerodynamic behavior of the bridge was one of the main concerns. This paper summarizes of the wind tunnel testing of the 1:40 scaled aeroelastic model testing for the free standing tower. The wind tunnel Investigations were carried out with the objective of verifying the detailed design of bridge towers through measurement of the buffeting response to turbulent wind, susceptibility to galloping instabilities and susceptibility to vortex shedding excitation in smooth oncoming flow.The test results show that explicit vortex-induced vibration was observed for the completed free standing tower, however it will not affect the safety of the tower, and the buffeting response of tower is within acceptable range under the designed wind speed.

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

2021 ◽  
pp. 136943322199249
Author(s):  
Huan Li ◽  
Xuhui He ◽  
Liang Hu ◽  
Guoji Xu
Keyword(s):  
Wind Tunnel ◽  
Surrogate Model ◽  
High Speed ◽  
Aerodynamic Force ◽  
Wind Tunnel Test ◽  
Geometric Parameters ◽  
Bridge Girders ◽  
Kriging Surrogate Model ◽  
Bridge Girder ◽  
Truss Bridge

This study presents an investigation to quantify the aerodynamics of truss bridge-girders via wind tunnel test and kriging surrogate model. Currently, the conventional methods documented in design specifications only take into consideration the mean drag force at null attack angle. To gain an in-depth understanding on the aerodynamics of truss bridge-girders, experiments on simplified bridge-girder models with various geometric parameters were carried out in uniform flow. A total of 15 truss bridge-girder models with aspect ratio (the ratio of width to height) B/D = 1.0, 1.3, 1.6, 1.9, and 2.2, solidity ratio (the ratio of projected to envelope areas) Φ = 0.20, 0.25, 0.30, 0.35, and 0.40, and two typical truss topologies (Warren and Pratt trusses) were examined in the most concerned range of wind angle of attack α = [–6°, 6°]. These truss bridge-girder models cover most of the high-speed railway bridges widely used in China. Experimental results show that the truss topology has limited effects on the aerodynamics of truss bridge-girders, whereas the effects of α, B/D, and Φ are significant. Based on these wind tunnel results, the ordinary kriging surrogate model was utilized to approximate the aerodynamics of truss bridge-girders. In using this model, aerodynamic force values for test cases can be interpolated with zero variance and uncertainties in unsampled design zones where geometric parameters can be quantified with Gaussian variance.

Investigation of shear resistance of steel bridge girders by load testing and monitoring of load response data under highway traffic conditions

2009 ◽  
Vol 36 (3) ◽  
pp. 415-426
Author(s):  
Alexander Au ◽  
Clifford Lam ◽  
Bala Tharmabala
Keyword(s):  
Load Capacity ◽  
Field Measurements ◽  
Shear Resistance ◽  
Bridge Girders ◽  
Steel Bridge ◽  
Load Testing ◽  
Highway Traffic ◽  
Traffic Loading ◽  
Response Data ◽  
Load Response

A recent strength evaluation of the Hogg’s Hollow Bridge on Highway 401 in Ontario revealed a significant deficiency in the shear resistance of the existing girders at support locations. This was attributed to the absence of transverse stiffeners at the extreme ends of the girders. However, none of the bridge girders showed any signs of distress. The Ontario Ministry of Transportation recently conducted a field study to investigate this shear issue in greater detail. To that end, a test program was devised to (a) monitor the real stresses in the end panels of two selected girders in the Hogg’s Hollow Bridge when subjected to (i) a test truck with known axle loads and (ii) normal highway traffic loading, and (b) calibrate the observed stresses against theoretically expected responses in the girders and calculate the live load capacity factor using the shear data derived from the field measurements.

Wind-Induced Performance of Long-Span Bridge with Modified Cross-Section Profiles by Stochastic Traffic

2014 ◽  
Vol 548-549 ◽  
pp. 1753-1757
Author(s):  
Jun Wu
Keyword(s):  
Wind Tunnel ◽  
Cross Section ◽  
Dynamic Loads ◽  
Dynamic Interactions ◽  
Buffeting Response ◽  
Long Span ◽  
Long Span Bridge ◽  
Fatigue Damage Accumulation ◽  
Section Model ◽  
The Impact

The presence of traffic on a slender long-span bridge (SLB) deck has two types of primary impacts: (1) modification of the bridge cross-section profiles, which may influence the flutter derivatives and in turn, wind-induced aeroelastic loads acting on the bridge; and (2) additional dynamic loads acting on the bridge including dynamic interactions from the vehicles. As compared to the investigations on the impact of traffic as external dynamic loads, those on the impact from the modification of bridge cross-section profiles are rather rare. A scaled bridge section model with vehicle models distributed on the bridge section has been tested in the wind tunnel laboratory. With the FDs obtained from the wind tunnel experiments of various modified bridge cross-section profiles by stochastic traffic, the present study is to numerically evaluate the impact on the wind-induced performance of the long-span bridge, such as the buffeting response and fatigue damage accumulation.

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