Numerical study on hydrodynamic characteristics of coastal bridge deck under joint action of regular waves and wind

2022 ◽  
Vol 245 ◽  
pp. 110450
Author(s):  
B.H. Wen ◽  
K. Qu ◽  
G.Y. Lan ◽  
W.Y. Sun ◽  
Y. Yao ◽  
...  
Keyword(s):  
Joint Action ◽  
Bridge Deck ◽  
Numerical Study ◽  
Hydrodynamic Characteristics ◽  
Regular Waves

scholarly journals Numerical Study on the Expansion and Variation of Changjiang Diluted Water in Summer and Autumn

2021 ◽  
Vol 9 (3) ◽  
pp. 317
Author(s):  
Wanli Hou ◽  
Menglin Ba ◽  
Jie Bai ◽  
Jianghua Yu
Keyword(s):  
Yangtze River ◽  
Sea Water ◽  
Numerical Study ◽  
River Estuary ◽  
Ocean Model ◽  
Theoretical Research ◽  
Yangtze River Estuary ◽  
Hydrodynamic Characteristics ◽  
Changjiang Diluted Water ◽  
Transportation Route

In view of the expansion and directional change mechanisms of Yangtze River water diluted with sea water in the shelf region (also known as Changjiang diluted water [CDW]) during summer and autumn, a three-dimensional hydrodynamic model of the Yangtze River Estuary (YRE) and its adjacent waters was established based on the Finite Volume Community Ocean Model (FVCOM). Compared with the measured data, the model accurately simulates the hydrodynamic characteristics of the YRE. On that basis, the influence of the expansion patterns of the CDW in both summer and autumn was studied. It was found that, in 2019, the CDW expanded to the northeast in the summer and to the southeast in the autumn, and that the route of the CDW is mainly controlled by the wind, not the runoff. Current seasonal winds also change the transportation route of the CDW by affecting its hydrodynamic field. Typhoons are frequent in both summer and autumn, causing abnormalities in both the transportation route and expansion of the CDW. During a typhoon, a large amount of the CDW is transported in a continuous and abnormal manner, accelerating the path turning of the CDW. This paper enhances the existing theoretical research of the CDW and provides a reference with respect to the expansion of diluted water all over the world.

Static and sustained loading behavior of a basalt FRP shell–concrete composite bridge deck: An experimental and numerical study

2021 ◽  
Vol 230 ◽  
pp. 111689
Author(s):  
Zheqi Peng ◽  
Xin Wang ◽  
Lining Ding ◽  
Yizhi Yang ◽  
Zhishen Wu ◽  
...  
Keyword(s):  
Bridge Deck ◽  
Numerical Study ◽  
Sustained Loading ◽  
Composite Bridge ◽  
Composite Bridge Deck

scholarly journals Hydrodynamics Around a Deep-Draft Semi-Submersible With Various Corner Shapes

2018 ◽  
Author(s):  
Yibo Liang ◽  
Longbin Tao
Keyword(s):  
Numerical Model ◽  
Experimental Test ◽  
Numerical Study ◽  
Water Channel ◽  
Hydrodynamic Characteristics ◽  
Shape Design ◽  
Circulating Water ◽  
Fluid Physics ◽  
Shape Effects ◽  
Geometric Study

A numerical study on flow over a stationary deep-draft semi-submersible (DDS) with various corner shapes was carried out to investigate the corner shape effects on the overall hydrodynamics. Three models based on a typical DDS design with different corner shapes were numerically investigated under 45° incidence. The present numerical model has been validated by an experimental test carried out in a circulating water channel. It is demonstrated that, as the corner shape design changed, the hydrodynamic characteristics alter drastically. In addition, the flow patterns were examined to reveal some insights of the fluid physics due to the changing of different corner shape designs. The detailed numerical results from the geometric study will provide a good guidance for future practical designs.

Optimum Performance of Bridge Isolation System under Parameter Uncertainty

2017 ◽  
Vol 8 (2) ◽  
pp. 82-101
Author(s):  
Bijan Kumar Roy
Keyword(s):  
Parameter Uncertainty ◽  
Bridge Deck ◽  
Optimization Problems ◽  
Numerical Study ◽  
Taylor Series Expansion ◽  
Matrix Perturbation ◽  
Isolation System ◽  
Optimum Performance ◽  
Interval Extension ◽  
Isolated Bridge

This article deals with the study of optimum performance of isolated bridge systems under stochastic earthquake load considering uncertain system parameters. The conditional stochastic response quantities are obtained in random vibration framework using the state space formulation. Subsequently, with the aid of matrix perturbation theory using first order Taylor series expansion of dynamic response function and its interval extension, the vibration control problem is transformed to appropriate deterministic optimization problems. This requires two separate objective functions correspond to a lower and upper bound optimum solutions. A lead rubber bearing system for isolating a bridge deck from a pier is considered for numerical study to elucidate the optimum performance of isolated bridge deck system. Then a numerical study is performed to observe the effect of parameter uncertainty on the optimization of the isolator parameters and the response reduction efficiency. It is seen that neglecting the effect of system parameter uncertainty may overestimate the system performance.

scholarly journals Numerical Study on Optimal Scheme of the Geothermally Heated Bridge Deck System

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6633
Author(s):  
Weidong Lyu ◽  
Hefu Pu ◽  
Jiannan (Nick) Chen ◽  
Zelei Gao
Keyword(s):  
Ambient Temperature ◽  
Bridge Deck ◽  
Numerical Study ◽  
Concrete Cover ◽  
Evaluation Index ◽  
Inlet Temperature ◽  
Evaluation Indexes ◽  
Ground Source ◽  
Absorption Power ◽  
Synthetic Evaluation

Ground source deicing system application in bridge decks is an alternative to salt use, which reduces corrosion and extends the deck service life. Herein, a preliminary parametric numerical analysis is performed to investigate the effects of several important parameters (tube spacing, inlet temperature, flow rate, and concrete cover) on heat transfer performance. Three evaluation indexes (average top surface temperature, snow melting proportion, and heat absorption power) are introduced, and a synthetic evaluation index is proposed to comprehensively consider factors. Mainly referring to the synthetic evaluation index, the optimal design scheme of a geothermally heated bridge deck system under various conditions (layout, lane number, ambient temperature, and tube spacing) is obtained and analyzed to determine the optimal inlet temperature and guide heated bridge deck design. Finally, the influence of wind speed and two adjustment methods are studied. The results indicate that the horizontal layout is the recommended circulating tube layout. The established empirical equations reveal that the optimal inlet temperature is linearly related to ambient temperature and exhibits a quadratic relationship with tube spacing. There is no need to add a heat insulation layer at the bridge deck bottom, and only tubes arranged near the wheels in lanes are recommended.

Sign in / Sign up

Export Citation Format

Share Document