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Prutkova Eugenia and Ryabchenkov Sergei

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## Prutkova Eugenia and Ryabchenkov Sergei

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**JASS-2006**Prutkova Eugenia and Ryabchenkov Sergei Represent Report on the theme:**JASS-2006**The wind loadsin building Presented on JASS – 2006, Saint-Petersburg**JASS-2006**Part I: Wind loads Content Part II:Effects from wind loads Part III:Influence of wind loads on the exploitation of the building by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Wind loads Part I by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**The normative valueof wind pressure Part I: Wind loads by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Figure 1: Map of wind zoning Part I: Wind loads**JASS-2006**Part I: Wind loads Figure 2: Map of wind zoning (part)**JASS-2006**Part I: Wind loads Table 1: Calculated values ofwindpressureonthe heightof buildings by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part I: Wind loads Figure 3:The scheme is used for collection loadsofbuilding the coefficient of dependability is: by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part I: Wind loads (2) - the normative value of wind pressure at the level of 10 metres over the surface of the ground, which corresponds 10-min. interval of averaging. Table 2: Dependence coefficients K1 and K2 from averaging interval by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part I: Wind loads (3) К1Н- value of cofficient К1on height Н under ground level by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**The determination of the resulted wind loads, acting on buildings and structures Part I: Wind loads by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part I: Wind loads Figure 4: The design scheme for tall buildings Wind (4) forces from action of the wind, according to the axes X,Y,Z moments, caused action of the wind, about this axes by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**wind -1 relative unit of length 1 relative unit of length Part I: Wind loads Figure 5: Level of pressure by streamlines ofairflow relative dimensionless value of the pression by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**wind micro-manometers Some words about aerodynamictube Part I: Wind loads Figure 6: The principal scheme of aerodynamictube by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**The determination of distributed wind loads, acting on surface of the building Part I: Wind loads by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part I: Wind loads (5) S – the square of the element (6) Ср1-the absolute peak (maximum) meaning of the coefficient rarefaction on the surface of the building by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Effects from wind loads Part II by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Resonance cases Part II: Effects from wind loads N - the frequency of break-down vortex, in Hertz; D - the specific size of object; V - the speed of incoming air flow; Sh - is determinated of the shape by traversal sectional view of streamlined building, the angle of incoming air flow α (7) by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**movement wind Galloping Part II: Effects from wind loads Figure 7: The principal scheme of ”Galloping” case by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part II: Effects from wind loads (8) - selfrelative constructional damping action; - frequency of the self oscillations of the building; - the density of the air; V - the velocity of the incoming flow; В - the specific size of traversal sectional view of the building; - the speed movement of the element of the building in the direction, perpendicularly to the speed V; - coefficients of the elevating forces and resistance of the element of the building in axes, connected with the resulted speed vector of air flow (figure 8). by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part II: Effects from wind loads Figure 8: Cross-section of elastic-fixed body vx x x v v y y The connectionCL andCDwith final speed vector of the air flow (9) measure Glauert-Den Gartog (10) by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**characteristics of the building measure of Glauert-Den Gartog Part II: Effects from wind loads (11) From this two formulas the extreme meaning of the speed V could be found, which starts the condition of galloping: (12) by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Divergency Part II: Effects from wind loads Figure 9: Collapse of Tacoma bridge by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part II: Effects from wind loads (13) • the normative value of the speed pressure at the height of building H, • the angle of coming to the building air flow, • the change of the angle due to the intertwisting of the building, • the stiffness coefficient of the building in the case of twisting (14) by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part II: Effects from wind loads otherwise: (15) according to this the change of the angle can be found: (16) by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Influenceof wind loads on the exploitationof the building Part III by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**movement wind Part III: Influence of wind loads onthe exploitation of the building Figure 10: The scheme of tall building by Prutkova Eugenia and Ryabchenkov Sergei**JASS-2006**Part III: Influence of wind loads onthe exploitation of the building Table 3: Dependence the level of discomfort from the value of acceleration by Prutkova Eugenia and Ryabchenkov Sergei