000004327 001__ 4327
000004327 005__ 20141118185759.0
000004327 04107 $$acze
000004327 046__ $$k2005-05-31
000004327 100__ $$aAhuja, A.K.
000004327 24500 $$aInterference Effect on Force and Moment Coefficients on Tall Buildings

000004327 24630 $$n10.$$pProceedings of the Tenth Americas Conference on Wind Engineering
000004327 260__ $$bAmerican Association for Wind Engineering, 2005
000004327 506__ $$arestricted
000004327 520__ $$2eng$$aThe information available regarding pressure and force coefficients in codes of practice of various countries on wind loads is generally for isolated buildings only. Presence of one or more buildings in the near vicinity alters wind pressures and thus forces on the building under consideration. This interference effect has been identified in early 30’s and since then many researchers have done both experimental and analytical studies of the interference effect among tall buildings. However, the results available in the research publications are yet not sufficient enough to prepare a set of recommendations for the designers to arrive at safe but economical design of tall buildings with respect to wind loads. Present paper describes the results of the experimental study carried out on rigid models of tall buildings in a boundary layer wind tunnel in order to study the interference effect. In all eight cases are studied in which interfering building models up to 3 in number are placed in different arrangements with respect to instrumented building model. 

000004327 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004327 653__ $$aInterference Effect, Force Coefficients, Moment Coefficients, Tall Buildings DETAILS OF MODELS In the present study, an effort has been made to fill the gap between available information [1-5] regarding interference effect among tall buildings. Models of tall buildings are made and tested in wind tunnel by keeping them in close vicinity in different arrangements. Rigid models of tall buildings of size 50 x 50 x 400 mm representing square plan shape with base to height ratio of 1:8 are made from Perspex sheet. Whereas instrumented building model is made from 6 mm thick sheet, interfering building models are made from 3 mm thick sheet. The instrumented building model is provided with 60 pressure tapings @ 15 on each face (Fig. 1). TEST SET-UPS Rigid models are tested in an open-circuit boundary layer wind tunnel with 2 x 2 m cross-section having a test section of 15 m length. It is assumed in the present study that the power law expression is valid for representing the wind velocity variation in the atmospheric boundary layer and accordingly a power law index of 0.17 is made used. This value corresponds to the open terrain condition mentioned as Terrain Category No. 2 in the Indian Standard on Wind Loads [6]. This category has well scattered obstructions having heights generally between 1.5 to 10 m. It includes the spa-rashly built up outskirts of towns and suburbs. Floor roughening devices namely 5 vortex generators, 7 no. 150 x 150 x 150 mm size cubical blocks and 4 no. 100 x 100 x 100 mm size cubical blocks are used on the up-stream end of the test section (Fig. 2) to achieve mean wind velocity profile with power law index of 0.17 and maximum turbulence intensity of 20% near floor. The static reference pressure point is taken on the floor of the wind tunnel at a distance of 7.8 m from the upstream end of the test section. Models are tested under free stream velocity of 15 m/sec measured at

000004327 7112_ $$aTenth Americas Conference on Wind Engineering$$cBaton Rouge, Louisiana (US)$$d2005-05-31 / 2005-06-04$$g10ACWE
000004327 720__ $$aAhuja, A.K.$$iJain, M.
000004327 8560_ $$ffischerc@itam.cas.cz
000004327 8564_ $$s217489$$uhttps://invenio.itam.cas.cz/record/4327/files/168-Ahuja.pdf$$yOriginal version of the author's contribution as presented on CD, , paper No. 168.
000004327 962__ $$r4178
000004327 980__ $$aPAPER