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 Wysłany: Nie 12:03, 03 Kwi 2011 Temat postu: High-rise building wind load effects of local comp |
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High-rise building wind load effects of local components
Move, its frequency and the main junction 3, 2003 4l structure of the input frequency is much higher than the main base band, not prone to resonance; the pulse of the frequency difference between the wind farther ( the predominant period of the wind is generally more than 4 seconds), so local members direct effect of wind-induced vibration is also very weak. As the general specification of the structure height is less than 30m do not have to consider the effect of wind-induced vibration, as their strength and their link with the main structure checking, can be considered as a rigid body relative to the main structure and not to wind vibration coefficient. Even if the components at a higher position, although the wind load than the lower value has increased, but research shows that reflect the maximum instantaneous wind speed increased turbulence intensity decreases with position, and its ripple effect is still large. 1 (b) follow the main structure in the before and after the swing process, the local component to the equilibrium position, speed of movement the most, this will lead to the relative velocity components and air flow increases or decreases. General civil engineering structures based on the fundamental frequency and amplitude of the common range of analysis, the oscillating air pressure changes caused by very small, and the maximum speed with the largest displacement (internal force is also the largest) is not the same place, so do not have to be considered. The following vertical cantilever demand components, such as balconies, parapet railing in a single width of the bottom of the root of the cantilever vibration the maximum internal force of the wind. Component units based mass distribution width set degree y, the bottom thickness is a1, the top thickness is a2, (see Figure 1b), then any point along the vertical thickness of al-y (al a ~ 2) / h, According to d'Alembert principle, the point differential expression for the inertial forces: df =- rIal-y (al-a2) / hldy. Eq (2) on behalf of the people on the type, may be the largest differential expression for the inertial force: df = colZrIal-y (al-a2) / hlI and l + y (a X2-one X1) / hldy, the maximum dynamic shear and dynamic moment are: _ (1_sf = 'o: lrh (a1x2 + aI2x1 +2 a1x1 +2 a2x2) / 6 one thousand one hundred eleven (3), a Md = sydf = ∞ rh (alX1 + a1X2 + a2X1 + 3a2X2) / 12 one hundred and eleven (4). In most cases, when the vertical panels of the upper and lower thickness the same, remember the thickness of a,[link widoczny dla zalogowanych], there are: Vd = co ~ rah (X1 + x2) / 2 one by one I (5), 422 003 No. 3 moment is: V = Vd + sW ~ one hundred and eleven (7), M = Md + sla, 2 / 2 one hundred and eleven (7), which should be members № local shape factor. the way for other supporting components, such as infill walls, the quality can be distributed according to the magnitude of the acceleration on the bottom surface of trapezoid converted into the distribution along the inertial force amplitude, and then superimposed with the direct wind load, for maximum internal force of wind-induced vibration. For the relatively large size, stiffness than small components, such as the daughter of a high concrete wall panels, billboards, dynamic methods can also be used, the components interfere with the distribution load inertia as the driving force, according to the main structure of the fundamental frequency of vibration of seeking the maximum dynamic response of the steady-state , and then superimposed direct wind load. When the local members have a greater quality, large scale, enough to affect the dynamic characteristics of the main body, then the application of the overall structure of the multi-modal analysis, no further explanation. Author: Ma On Shan City Urban Design Institute of person-years since the construction of Ma On Shan City investment, project more than two projects, especially in road construction, speed up the southeastern part of the road network to focus on road construction, new construction, expansion of 11 key roads. as a true record changes in urban construction and development of the whole process, leaving valuable historical information, Hunan Urban Construction Archives in a timely manner Road, Lake South Road, Center Road, Kau Wa Road, construction of key road projects such as the original pre-construction and building construction, etc. shooting video, and in accordance to track the progress of works taken to form audio and video archives. Meanwhile, the film also edited the video data to produce television news sent to television stations, and actively cooperate in the publicity work of city construction . In addition, in April this year, CCTV 4 sets of June, the Ma On Shan City Urban Construction Archives of key projects were shooting video data 22 times, take photographs 7O Zhang, provide access to photographs 26; film production A, construction of key projects propaganda TV news reports 8. (Long Dong Bao) 1_-1
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