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The development in construction technology and the social demand for tall structures have created a recent trend of tall structures. The structural safety of tall building is often depended by its structural design to withstand wind loads, whereas the habitability of the buildings is often hindered with wind induced vibration. The habitability of the building is especially affected not so much by the along-wind vibration, but the across-wind vibration. In order to properly evaluate the effect of across-wind vibration, the wind tunnel test has to be conducted. Also, due to the crowding of structures in urban locations and the trend of atypical design of structures, the wind pressure on cladding is becoming harder to anticipate. The pedestrian level wind environment is also highly affected by the structures as well.
TESolution consists of wind engineering experts that has provided total wind engineering solution for various structures around the globe, and it continues to play the pioneering role in the field of wind resistance design and its analysis techniques.
HIGH FREQUENCY FORCE BALANCE
High Frequency Force Balance (HFFB) test is used to estimate wind loads and vibration frequency of the building to be utilized in structural design, and to measure vibration acceleration of the building to evaluate serviceability of the building. In the HFFB test, light and rigid model is used to measure wind loads by six components (shear and moment of each structural axis). The wind force coefficient is computed by time dependent force data and the response of the model is evaluated by the spectral modal analysis.
▣ Base sheer, base overturning moment, and torsional moment ▣ Combined static floor-by-floor wind load ▣ Lateral displacement ▣ Wind-induced acceleration, evaluate serviceability (AIJ, ISO, NBC) ▣ Basic design of vibration control device (TMD, AMD, TLCD, etc.)
Soho Navi, Al Reem Island, Abudhabi
Samsung Raemian Yongsan Residencial Resisencial, Korea
Wind Pressure Test
Wind Pressure Test is performed to evaluate wind pressure on claddings for buidling and to evaluate sturctural wind load for atypical designed structures such as stadiums and long-span roofs. The wind pressure test is performed with multi-point pressure measurement system, which evaluates wind pressure through calibrated pressure tubes installed on a rigid model. The results provide pressure coefficients (means, rms, peak value), which can be analyzed to estimate proper design pressure of claddings. Details of the model is a must for this test as the pressure applied to a point may vary due to the reproducibility of the model to the real structure. The distortion effects caused by the distance between the model point and the pressure transducer is also corrected. In similar fashion to the High Frequency Force Balance approach, the results are derived by pressure integral method (PIM) and results are subsequently used to provide the estimates of the full scale response of the buildings.
▣ Pressure for cladding design ▣ Wind load for structural design ▣ Differential pressure for parapet, canopy, free-standing wall, etc. ▣ Overall wind loads and responses by pressure integral method
Munhak Main Stadium, Incheon, Korea
Cheongnyangni Lotte Castle Residencial Complex, Seoul, Korea
Sipjeoung Tennis Stadium, Incheon, Korea
Sarang Church, Seoul, Korea
Pedestrians Level Wind Environment Test
The Pedestrians Level Wind Environment Test is performed to evaluate comfort and safety of pedestrians near the building. When a tall building is built, the wind flow pattern around the building creates unexpected currents with different speeds. Generally, the pedestrian wind environment is evaluated by wind speed ratios and probabilities of occurrence of wind speed / direction near the target area.
▣ Frequency of wind speed and its direction ▣ Wind speed ratio ▣ Assessment of pedestrian level wind ▣ Visualization of wind flow
Lotte World Tower, Seoul, Korea
Sharngri La Hotel, Ulaanbaatar, Mongolia
AEROELASTIC MODEL TEST
Aeroelastic Model Test is suitable for slender, flexible, and dynamically sensitive structure. The objective of the aeroelastic model test is to investigate the vortex-induced vibration and aerodynamic instability vibration within range of target wind speed. The aeroelatic model is designed with precisely scaled dynamic properties of the full-scale buildings (stiffness, mass, natural frequency, and damping properties of the structural system). Responses are directly measured in the wind tunnel, using non-contact displacement meters (optical sensor type) or accelerometers.
▣ Base sheer, base overturning moment, and torsional moment ▣ Combined static floor-by-floor wind load ▣ Lateral displacement ▣ Wind-induced acceleration, evaluate serviceability (AIJ, ISO, NBC) ▣ Study of vortex shedding and aerodynamic instability ▣ Basic design of vibration control device (TMD, AMD, TLCD, etc.)
Dangjin Power Plant Stack, Korea
Boryoung New Power Plant Stack, Korea
TOPOGRAPHY MODEL TEST
Topography Model Test is performed to evaluate the characteristics of wind directions and wind speeds over large areas having complex terrain and topographical features. Wind speeds and turbulence intensities over scaled-topographical model are measured, using an anemometer system.
▣ Distribution of wind speed (horizontal and vertical directions) ▣ Distribution of turbulence intensity (horizontal and vertical directions) ▣ Topographic effects