HFBB model test for tall buildings: A comparative benchmark with a full-aeroelastic model

2021 ◽  
Vol 242 ◽  
pp. 112591
Author(s):  
Giovanni Frison ◽  
Antonino Maria Marra ◽  
Gianni Bartoli ◽  
Roberto Scotta
Keyword(s):  
Model Test ◽  
Tall Buildings ◽  
Aeroelastic Model

Experimental Study of the Nonlinear Torsional Flutter of a Long-Span Suspension Bridge with a Double-Deck Truss Girder

2021 ◽  
pp. 2150102
Author(s):  
Ming Li ◽  
Yanguo Sun ◽  
Yongfu Lei ◽  
Haili Liao ◽  
Mingshui Li
Keyword(s):  
Wind Tunnel ◽  
Model Test ◽  
Wind Tunnel Test ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
Nonlinear Flutter ◽  
Long Span ◽  
Aeroelastic Model ◽  
Flutter Analysis ◽  
Section Model

The purpose of this study is to investigate the nonlinear torsional flutter of a long-span suspension bridge with a double-deck truss girder. First, the characteristics of nonlinear flutter are studied using the section model in the wind tunnel test. Different aerodynamic measures, e.g. upper and lower stabilizers and horizontal flaps, are applied to improve the flutter performance of the double-deck truss girder. Then, the full bridge aeroelastic model is tested in the wind tunnel to further examine the flutter performance of the bridge with the optimal truss girder. Finally, three-dimensional (3D) flutter analysis is performed to study the static wind-induced effects on the nonlinear flutter of the long-span suspension bridge. The results show that single-degree-of-freedom torsional limit cycle oscillations occur at large amplitudes for the double-deck truss section at the attack angles of [Formula: see text] and [Formula: see text]. The upper and lower stabilizers installed on the upper and lower decks, respectively, and the flaps installed near the bottoms of the sidewalks can all effectively alleviate the torsional flutter responses. Meanwhile, it is found that the torsional flutter responses of the truss girder in the aeroelastic model test are much smaller than those in the section model test. The 3D flutter analysis demonstrates that the large discrepancies between the flutter responses of the two model experiments can be attributed to the additional attack angle caused by the static wind-induced displacements. This finding highlights the importance and necessity of considering the static wind-induced effects in the flutter design of long-span suspension bridges.

Full aeroelastic model test of a super long-span bridge with slotted box girder

2002 ◽  
Vol 90 (12-15) ◽  
pp. 2023-2032 ◽  
Author(s):  
Hiroshi Sato ◽  
Nobuyuki Hirahara ◽  
Koichiro Fumoto ◽  
Shigeru Hirano ◽  
Shigeki Kusuhara
Keyword(s):  
Model Test ◽  
Box Girder ◽  
Long Span ◽  
Long Span Bridge ◽  
Aeroelastic Model

Aeroelastic Model Test on Cable Dome of Geiger Type

2006 ◽  
Vol 21 (3) ◽  
pp. 131-140 ◽  
Author(s):  
Zhi-Hong Zhang ◽  
Yukio Tamura
Keyword(s):  
Model Test ◽  
Aeroelastic Model ◽  
Cable Dome

AEROELASTIC MODEL TEST STUDY ON A BRIDGE PYLON CONSIDERING THE INTERFERENCE EFFECTS OF SURROUNDING STRUCTURES

2013 ◽  
Vol 13 (05) ◽  
pp. 1350011 ◽  
Author(s):  
RU-JIN MA ◽  
XIAO-HONG HU
Keyword(s):  
Model Test ◽  
Interference Effect ◽  
Mode Analysis ◽  
Mode Shapes ◽  
Elastic Model ◽  
Cooling Towers ◽  
Interference Effects ◽  
Turbulence Flow ◽  
Aeroelastic Model ◽  
Vibration Responses

The interference effect between buildings has been a popular issue in structural wind engineering for a long time. Most researches about this issue have been focused mainly on high-rise buildings. For long-span bridges, the interference effects between structures are rarely discussed. In this paper, an aerodynamic elastic model test of a free-standing bridge pylon located adjacent to two large-scale cooling towers is presented. Through the mode analysis, the structure mode shapes are obtained. Then by the simulation of the two cooling towers in the boundary layer during the aeroelastic model test, the vibration responses of the bridge pylon in smooth and turbulence flows are obtained respectively. The study shows that the interference effect of the two huge-volume cooling towers on the wind induced vibration responses of the bridge pylon should not be neglected. In smooth flow, due to the regular shedding vortex from the upwind cooling towers, the interference effect is evident in that strong resonant responses are induced on the lower-order modes of the downwind bridge pylon. However, in turbulence flow, this kind of interference effect is greatly reduced. Moreover, more attention should be paid to the case when the cooling towers are located at the perfectly right upwind direction of the bridge pylon. Their interference effect will certainly cause great resonant vibrations in the longitudinal direction, which cannot be ignored for granted. Furthermore, the turbulence flow at the bridge pylon considering the interference effect is measured through a 1:500 flow experiment to discover the interference effect of the cooling towers. In the end, a dynamic magnification factor is proposed to take the interference effect into consideration, with a value of 2.25 suggested for the design of pylons.

A new method for studying wind engineering of bridges: Large-scale aeroelastic model test in natural wind

2020 ◽  
Vol 202 ◽  
pp. 104234 ◽  
Author(s):  
Fuyou Xu ◽  
Zhaoyu Ma ◽  
Hua Zeng ◽  
Mingjie Zhang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Model Test ◽  
Large Scale ◽  
New Method ◽  
Wind Engineering ◽  
Aeroelastic Model ◽  
Natural Wind

Aerodynamic Stability of a Three-Tower Suspension Bridge during Erection via Aeroelastic Model Test

2013 ◽  
Vol 405-408 ◽  
pp. 1494-1499
Author(s):  
Wen Ming Zhang ◽  
Yao Jun Ge
Keyword(s):  
Wind Speed ◽  
Cross Section ◽  
Model Test ◽  
Frequency Ratio ◽  
Suspension Bridge ◽  
Aerodynamic Stability ◽  
Wind Speeds ◽  
Critical Wind Speed ◽  
Long Span ◽  
Aeroelastic Model

As a new long-span suspension bridge with double main spans and a typical closed streamline cross-section of single box deck, the flutter performance of the Maanshan Bridge during erection was investigated via a full bridge aeroelastic model test. Critical flutter wind speeds of 13 testing cases with different percentage of deck completion are much higher than the flutter checking wind speeds, and the bridge is hence proven to be stable enough during erection in aerodynamics. The case with the percentage of deck completion of 86.4% gets the lowest flutter critical wind speed, perhaps because frequency ratio gets the minimum value at this case.

Sign in / Sign up

Export Citation Format

Share Document