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IRJET- Effect of Wind on Tall Structures
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 233 EFFECT OF WIND ON TALL STRUCTURES Mohamad zaid chishty 1, Satya Veer Singh 2 1M.Tech Scholar Structural Engineering Department of Civil Engineering, Rama University Kanpur India 2Asst. Proff. Department of Civil Engineering, Rama University Kanpur India ----------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Easy quasi-static treatment of wind loading, that is universally applied to style of typical low to medium-rise structures, is intolerably conservative for style of terribly tall buildings. On the other hand such easy treatment will simply result in inaccurate results and under-estimations. additional significantly such a simplified treatment for explanation lateral masses doesn't address key style problems as well as dynamic response (effects of resonance, acceleration, damping, and structural stiffness), interference from different structures, wind radial asymmetry, and cross wind response, that square measure all vital factors in wind style of tall buildings. This paper provides an overview of advanced levels of wind style, within the context of the Australian Wind Code, and illustrates the exceptional edges it offers over simplified approaches. structure testing, which has the potential edges of additional refinement in explanation style wind loading and its effects on tall buildings, is additionally emphasised. Key Words: SFRC, FIBER, SP, FRC, RCC INTRODUCTION Wind could be a development of nice complexness because of the numerous flow things arising from the interaction of wind with structures. Wind is composed of a mess of eddies of varied sizes and movement characteristics carried on in an exceedingly general stream of air moving relative to the earth’s surface. These eddies provide wind its blustering or turbulent character. The gustiness of robust winds in the lower levels of the atmosphere mostly arises from interaction with surface options. the typical wind speed over a period of time of the order of 10 minutes or additional tends to extend with height, while the gustiness tends to decrease with height. The wind vector at a degree is also considered the sum of the mean wind vector (static component) and a dynamic, or turbulence, component A consequence of turbulence is that dynamic loading on a structure depends on the dimensions of the eddies. giant eddies, whose dimensions are comparable with the structure, bring about to well related to pressures as they wrap the structure. On the other hand, little eddies end in pressures on various components of a structure that become much uncorrelated with distance of separation. Eddies generated around a typical structure are shown in Some structures, notably people who area unit tall or slender, respond dynamically to the consequences of wind. The best legendary structural collapse because of wind was the city Narrows Bridge that occurred in 1940 at a wind speed of solely concerning nineteen m/s. It unsuccessful when it had developed a coupled torsional and flexural mode of oscillation. There area unit many completely different phenomena giving rise to dynamic response of structures in wind. These embrace buffeting, vortex shedding, pace and flutter. Slender structures area unit doubtless to be sensitive to dynamic response in line with the wind direction as a consequence of turbulence pounding. transversal or cross-wind response is a lot of doubtless to arise from vortex shedding or pace however may result from excitation by turbulence pounding. Flutter could be a coupled motion, usually being a mixture of bending and torsion, and may lead to instability. For building structures flutter and galloping are generally not an issue. WIND SPEED At nice heights higher than the surface of the world, where resistance effects are negligible, air movements are driven by pressure gradients within the atmosphere, which successively are the physics consequences of variable star heating of the world. This upper level wind speed is thought because the gradient wind speed.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 234 Roughness length, zo, Mean wind profiles for different terrains DESIGN WIND LOAD The characteristics of wind pressures on a structure square measure a operate of the characteristics of the approaching wind, the pure mathematics of the structure under thought, and therefore the pure mathematics and proximity of the structures upwind. The pressures don't seem to be steady, however extremely unsteady, partially as a results of the gustiness of the wind, however conjointly due to native vortex shedding at the perimeters of the structures themselves. The unsteady pressures may end up in fatigue harm to structures, and in dynamic excitation, if the structure happens to be dynamically wind sensitive. The pressures also are not uniformly distributed over the surface of the structure, but vary with position. The complexities of wind loading, ought to be unbroken in mind once applying a style document. Because of the numerous uncertainties concerned, the utmost wind masses knowledgeable about by a structure throughout its lifetime, could vary wide from those assumed in design. Thus, failure or non-failure of a structure in a wind storm can't essentially be taken as Associate in Nursing indication of the non-conservativeness, or conservativeness, of the Wind Loading commonplace. The Standards don't apply to buildings or structures that square measure of bizarre form or location. Wind loading governs the look of some kinds of structures such as tall buildings and slender towers. It often becomes enticing to form use of experimental wind tunnel information in situ of the coefficients given in the Wind Loading Code for these structures. Types of Wind Design Typically for wind sensitive structures three basic wind effects need to be considered. • Environmental wind studies - investigate the wind effects on the surrounding environment caused by erection of the structure (e.g. tall building). This study is particularly important to assess the impact of wind on pedestrians, motor vehicles and architectural features such as fountains, etc, which utilise public domain within the vicinity of the proposed structure. • Wind loads for façade - to assess design wind pressures throughout the surface area of the structure for designing the cladding system. Due to the significant cost of typical façadesystems in proportion to the overall cost of very tall buildings, engineers cannot afford the luxury of conservatism in assessing design wind loads. With due consideration to the complexity of building shapes and dynamic characteristics of the wind and building structures, even the most advanced wind codes generally cannot accurately assess design loads. Wind tunnel testing to assess design loads for cladding, is now normal industry practice, with the aim of minimising initial capital costs, and more significantly avoiding expensive maintenance costs associated with malfunctions due to leakage and/or structural failure. • Wind loads for structure – to determine the design wind load for designing the lateral load resisting structural system of a structure Design Criteria In terms of designing a structure for lateral wind loads the following basic design criteria need to be satisfied. • Stability against overturning, uplift and/or sliding of the structure as a whole.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 235 • Strength of the structural components of the building is required to be sufficient to withstand imposed loading without failure during the life of the structure. • Serviceability for example for buildings, where inter storey and overall deflections are expected to remain within acceptable limits. Control of deflection and drift is imperative for tall buildings with the view to limiting damage and cracking of non structural members such as the facade, internal partitions and ceilings. The ultimate limit state wind speed is adopted by most international codes to satisfy stability and strength limit state requirements. In many codes such a speed has a 5% probability of being exceeded in a fifty year period. An additional criterion that requires careful consideration in wind sensitive structures such as tall buildings is the control of sway accelerations when subjected to wind loads under serviceability conditions. Acceptability criteria for vibrations in buildings are frequently expressed in terms of acceleration limits for a one or five year return period wind speed and are based on human tolerance to vibration discomfort in the upper levels of buildings. These limits are also dependent on building sway frequencies. Wind response is relatively sensitive to both mass and stiffness, and response accelerations can be reduced by increasing either or both of these parameters. However, this is in conflict with earthquake design optimization where loads are minimised in buildings by reducing both the mass and stiffness. Increasing the damping results in a reduction in both the wind and earthquake responses. The detailed procedure described in wind codes is sub-divided into Static Analysis and Dynamic Analysis methods. The static approach is based on a quasi-steady assumption, and assumes that the building is a fixed rigid body in the wind. The static method is not appropriate for tall structures of exceptional height, slenderness, or susceptibility to vibration in the wind. In practice, static analysis is normally appropriate for structures up to 50 metres in height. The subsequently described dynamic method is for exceptionally tall, slender, or vibration-prone buildings. The Codes not onlyprovide some detailed design guidance with respect to dynamic response, but state specifically that a dynamic analysis must be undertaken to determine overall forces on any structure with both a height (or length) to breadth ratio greater than five, and a first mode frequency less than 1 Hertz. Wind loading codes may give the impression, that wind forces are relatively constant with time. In reality wind forces vary significantly over short time intervals, with large amplitude fluctuations at high frequency intervals. The magnitude and frequency of the fluctuations is dependent on many factors associated with turbulence of the wind and local gusting effects caused by the structure and surrounding environment. To simplify this complex wind characteristic, most international codes have adopted a simplified approach by utilising a quasi-steady assumption. ALONG AND CROSS-WIND LOADING Not only is the wind approaching a building a complex phenomenon, but the flow pattern generated around a building is equally complicated by the distortion of the mean flow, flow separation, the formation of vortices, and development of the wake. Large wind pressure fluctuations due to these effects can occur on the surface of a building. As a result, large aerodynamic loads are imposed on the structural system and intense localised fluctuating forces act on the facade of such structures. Under the collective influence of these fluctuating forces, a building tends to vibrate in rectilinear and torsional modes, as illustrated in Fig.. The amplitude of such oscillations is dependant on the nature of the aerodynamic forces and the dynamic characteristics of the building. Wind Response Directions
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 236 Along-Wind Loading The along-wind loading or response of a building due to buffeting by wind can be assumed to consist of a mean component due to the action of the mean wind speed (eg, the mean-hourly wind speed) and a fluctuating component due to wind speed variations from the mean. The fluctuating wind is a random mixture of gusts or eddies of various sizes with the larger eddies occurring less often (i.e. with a lower average frequency) than for the smaller eddies. The natural frequency of vibration of most structures is sufficiently higher than the component of the fluctuating load effect imposed by the larger eddies. i.e. the average frequency with which large gusts occur is usually much less than any of the structure's natural frequencies of vibration and so they do not force the structure to respond dynamically. The loading due to those larger gusts (which are sometimes referred to as "background turbulence") can therefore be treated in a similar way as that due to the mean wind. The smaller eddies, however, because they occur more often, may induce the structure to vibrate at or near one (or more) of the structure's natural frequencies of vibration. This in turn induces a magnified dynamic load effect in the structure which can be significant. The separation of wind loading into mean and fluctuating components is the basis of the so-called "gust-factor" approach, which is treated in many design codes. The mean load component is evaluated from the mean wind speed using pressure and load coefficients. The fluctuating loads are determined separately by a method which makes an allowance for the intensity of turbulence at the site, size reduction effects, and dynamic amplification (Davenport, 1967). The dynamic response of buildings in the alongwind direction can be predicted with reasonable accuracy by the gust factor approach, provided the wind flow is not significantly affected by the presence of neighbouring tall buildings or surrounding terrain. Cross-Wind There are many examples of slender structures that are susceptible to dynamic motion perpendicular to the direction of the wind. Tall chimneys, street lighting standards, towers and cables frequently exhibit this form of oscillation which can be very significant especially if the structural damping is small. Crosswind excitation of modern tall buildings and structures can be divided into three mechanisms and their higher time derivatives, which are described as follows: (a) Votex Shedding. The most common source of crosswind excitation is that associated with ‘vortex shedding’. Tall buildings are bluff (as opposed to streamlined) bodies that cause the flow to separate from the surface of the structure, rather than followthe body contour . For a particular structure, the shed vortices have a dominant periodicity that is defined by the Strouhal number. Hence, the structure is subjected to a periodic cross pressure loading, which results in an alternating crosswind force. If the natural frequency of the structure coincides with the shedding frequency of the vortices, large amplitude displacement response may occur and this is often referred to as the critical velocity effect. The asymmetric pressure distribution, created by the vortices around the cross section, results in an alternating transverse force as these vortices are shed. If the structure is flexible, oscillation will occur transverse to the wind and the conditions for resonance would exist if the vortex shedding frequency coincides with the natural frequency of the structure. This situation can give rise to very large oscillations and possibly failure. Vortex formation in the wake of a bluff object. (b) The incident turbulence mechanism. The ‘incident turbulence’ mechanism refers to the situation where the turbulence properties of the natural wind give rise to changing wind speeds and directions that directly induce varying lift and drag forces and pitching moments on a structure over a wide band of frequencies. The ability of incident turbulence to produce significant contributions to crosswind response depends very much on the ability to generate a crosswind (lift) force on the structure as a function of longitudinal wind speed and angle of attack. In general, this means sections with a high lift curve slope or pitching moment curve slope, such as a streamline bridge deck section or flat deck roof, are possible candidates for this effect.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 237 (c) Higher derivatives of crosswind displacement. There are three commonly recognized displacement dependent excitations, i.e., ‘galloping’, ‘flutter’ and ‘lock-in’, all of which are also dependent on the effects of turbulence in as much as turbulence affects the wake development and, hence, the aerodynamic derivatives. Many formulae are available to calculate these effects (Holmes, 2001). Recently computational fluid dynamics techniques(Tamura, 1999) have also been used to evaluate these effects. CONCLUSION This paper has considered a number of key factors associated with the design of tall buildings to the effects of wind loading. The general design requirements for structural strength and serviceability assume particular importance in the case of tall building design as significant dynamic response can result from both buffeting and cross-wind wind loading excitation mechanisms. Serviceability with respect to occupier perception of lateral vibration response can become the governing design issue necessitating the introduction of purpose-designed damping systems in order to reduce these vibrations to acceptable levels. Dynamic response levels also play an important role in the detailed design of façade systems. State of the art boundary layer wind tunnel testing, for determining global and local force coefficients and the effects of wind directionality, topographical features and nearby structures on structural response, is recognized as being particularly useful to tall building design. The emerging use of CFD codes, particularly at the concept design stage, is also noted as assuming increasing importance in the design of tall buildings. REFERENCES Hira A. and Mendis P. (1995) Wind Design of Tall Buildings. Conference on High-rise Buildings in Vietnam. Hanoi, Vietnam, February Irwin A.W. (1978) Human Response to Dynamics Motion of Structures. The Structural Engineer London. Deaves D.M., Harris, R.I. (1978) A mathematical model of the structure of strong winds. Report No. 76. United Kingdom Construction Industry Research and Information Association. Melbourne W.H. (1989) Private Communication. Taranath B.S. (1988) Structural Analysis and Design of Tall Buildings. McGraw-Hill Book Company. Yamada M. and Goto (1975). T. The criteria to motions in Tall Buildings. Proc. Pan Pacific Tall Buildings Conference, Hawaii, pp. 233-244. Holmes D.J. 2001. Wind Loading of Structures. Spon Press, London Sachs P. 1978. Wind Forces in Engineering, Pergamon Press, Oxford Davenport, A.G. (1967) The dependence of wind loads on meteorological parameters. Proc. Int. Res. Seminar, Wind Effects on Buildings and Structures, Ottawa, Univ. of Toronto Press, 19 – 82 AS/NZ1170.2 (2002) Australian/New Zealand Standard, Structural design actions, Part 2: wind actions, Standards Australia & Standards New Zealand. Tamura Y., Ohkuma, T., Okada, H., Kanda, J. (1999) Wind loading standards and design criteria in Japan, J. Wind Engineering and Industrial Aerodynamics, 83, 1, 555-566. Cooney R.C. and King, A.B. (1988) Serviceability criteria of buildings ANSI Code (1982). ANSI A58.1-1982. Minimum Design Loads for Buildings and Other Structures. Indian NationalStandards Institute Soong T.T. and Costantinou, M.C. (1994). Passive and active structural vibration control in civil engineering.
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