turbine structural loading during heavy rain

ifluids.com article

Rain Loads in Structural Engineering | Standards & Design

https://ifluids.com/standard/rain-loads-structural-engineering

# Rain Loads in Structural Engineering: Understanding, Analysis, and Design Implications. Its influence is not simply limited to wetting of the surface or water infiltration; in structural engineering terms, rain load refers specifically to **the weight of accumulated water on roofs, decks, or other horizontal/near-horizontal surfaces**. Rain load impact on flat roofs showing water ponding, blocked drainage, and structural roof collapse under heavy rainfall. The **ASCE 7 standard** dedicates a complete section to **rain loads** because failures arising from inadequate drainage, ponding, or underestimated rainfall intensity have historically caused catastrophic collapses. In structural terms, a **rain load** is the gravitational pressure exerted by water accumulated on a structural surface. This incident prompted revisions in **Eurocode EN 1991-1-4 and EN 1991-1-3 interactions** to more explicitly capture rain-on-snow and ponding risks. Standards like **ASCE 7, Eurocode, and IS 875** emphasize the dual role of rain load: as a **direct gravitational pressure** and as a **trigger for ponding instability**.

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onlinelibrary.wiley.com article

Extreme Dynamic Responses of MW‐Level Wind Turbine Tower in ...

https://onlinelibrary.wiley.com/doi/10.1155/2013/512530

To determine the dynamic response characteristics of high-power wind turbines under extreme conditions, wind load and rain load are simulated.

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asmedigitalcollection.asme.org article

Loads on a Jacket-Supported Wind Turbine During Hurricane Sandy ...

https://asmedigitalcollection.asme.org/offshoremechanics/article/144/1/012001…

Aerodynamic loads on the turbine rotor are first evaluated using a wind turbine model in fast with a fixed base; then, these rotor aerodynamic

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backend.orbit.dtu.dk article

[PDF] Turbulence and turbulence-generated structural loading in wind ...

https://backend.orbit.dtu.dk/ws/files/12674798/ris_r_1188.pdf

i sf separation between rows, in rotor diameters sr separation of units in the rows, in rotor diameters sfat Stress range causing fatigue failure for nfat load cycles [N/m2] SMS Sea Mast South, Vindeby SMW Sea Mast West, Vindeby Std. Standard deviation S Instantaneous flow speed [m/s] Risø-R-1188(EN) 111 S Flow speed experienced by blade section [m/s] Sy Power spectrum of response of cylinder Sx Power spectrum of response Su Power spectrum of along wind wind speed fluctuations [m2/s] Su Cross spectrum of u [m2/s] St Strouhal number t time [sec] t = ρctuh 2, distributed thrust (per-area-unit land area) [N/m2] T = ½ρCTAruh 2, thrust on wind turbine [N] T Force vector acting on control volume [N] u Wind speed fluctuation, along wind component [m/s] u* Friction velocity [m/s] u*i Friction velocity under hub height [m/s] u*0 Friction velocity over hub height in infinite wind farm [m/s] u*0 Friction velocity under h(x) after roughness change [m/s] u*addwf Friction velocity including wind farm [m/s] ue Uncertainty in equivalent load ut Wind speed fluctuations perpendicular to flow direction [m/s] U Mean wind speed [m/s] U0 Ambient/upwind mean wind speed [m/s] Ub Mean wind speed in the wake [m/s] Uh Mean wind speed at hub height in wind farm [m/s] Ui Mean wind speed over 30min period [m/s] U1 Mean wind speed under h(x) after roughness change [m/s] U48 Mean wind speed at height 48m [m/s] U20 Mean wind speed at height 20m [m/s] U38,SMW Mean wind speed at 38m in SMW [m/s] U38,SMS Mean wind speed at 38m in SMS [m/s] Uh Hub height mean wind speed [m/s] Ur Mean wind speed in rotor plane [m/s] Uw Wake mean wind speed [m/s] v Wind speed fluctuations, lateral to wind direction [m/s] v Normalised gust, along wind [m/s] vK Largest extreme of K upcrossings w Wind speed fluctuations, vertical [m/s] x Distance downwind from wind turbine [m] x Distance downwind from roughness

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