Dynamic Evaluation of the Building Envelope for Wind and Wind-Driven Rain Performance

Baskaran, Bas A.; Brown, W. C.

doi:10.1177/109719639501800306

Cited by 3 publications

(2 citation statements)

References 5 publications

(5 reference statements)

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“…It is assumed that the raindrops are equivalent to D 0 , and the number of equivalent rain drops in a unit volume is n 0 . In time τ, the number of raindrops with diameter D 0 falling in zone I and zone II is N = (LHu r0 + LBv r0 )τn 0 (16) where L, B, and H represent the length, width, and height of the rectangle, respectively; and the other symbols are the same as previously mentioned. The vertical force of raindrops P rv is…”

Section: Rain Drop Impact Analysis and Simplified Calculation Modelmentioning

confidence: 99%

“…The field of wind-driven rain of buildings focuses on analyzing the trajectory of wind-driven rain and its distribution on the windward side of the building to determine the degree of erosion [9][10][11][12][13]. For some special flexible building structures, some scholars pointed out that the additional load effect of wind-driven rain cannot be ignored [14][15][16][17][18][19][20]. In the field of bridge cable wind-driven rain-induced vibration research, since Hikami et al [21] discovered this phenomenon in 1988, it has a wealth of theories, actual measurements, experiments on the waterline motion pattern of the cable caused by wind-driven rain, the influence mechanism of the additional aerodynamic force, and simulation analysis results [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Calculation and Experimental Verification of Wind-Driven Rain Aerodynamic Forces on the Bridge Main Beam

Lei,

Shen,

Chen

et al. 2023

Atmosphere

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Regarding the issue of changes in the aerodynamic force of the bridge main beam under the action of wind-driven rain, this article explores the changes in air density caused by rainfall, the calculation theory of raindrop impact force and its simplified mass-weighted equivalent method (MWEM), and the calculation method of water accumulation thickness on the surface of the main beam. The calculation shows that the changes in air density caused by rainfall can be ignored, and the error of the MWEM increases with the increase in rainfall intensity; however, even at a rainfall intensity of 709 mm/h, the deviations in the MWEM value of the horizontal and vertical raindrop impact force is only about +5% and −4%, respectively. Then, based on the above analysis, a calculation model for the aerodynamic three-component forces of the main beam caused by rainfall under the action of wind-driven rain is provided. Finally, taking two typical main beam sections as an example, static three-component force tests are carried out on the main beam model under different rainfall intensities. The experimental results show that the drag coefficient variations obtained through the MWEM are in good agreement with experimental data, which proves the correctness of the theoretical model of the raindrop impact force. But for the lift and torque coefficient, the differences between theoretical and experimental values are much more significant than the drag coefficient, and it increases with the increase in rain intensity. It can be seen that the surface ponding model and influence of rainfall intensity need to be further explored. In summary, the theoretical calculation method for the additional aerodynamic force of wind-driven rain on the main beam proposed in this article is convenient and practical, and it can provide a certain reference for the rapid safety assessment of bridges under extreme meteorological conditions.

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Section: Rain Drop Impact Analysis and Simplified Calculation Modelmentioning

confidence: 99%