平屋蓋風荷載與等效靜風荷載解析方法研究
[Abstract]:Long-span flat roof structure is a common type of roof, which is widely used in engineering. Wind load is one of the main control loads in the design of this kind of structure. The wind-resistant design provisions in the current GB.50009 code mainly focus on the calculation method of wind load for high-rise buildings, such as tall buildings, which only consider the first order vibration modes, but there are no specific provisions for long-span flat roof structures. The parametric method is mainly used to study the wind-induced vibration response and equivalent static wind load of this kind of structures, but the influence of geomorphological and roof shapes is not fully considered. In this paper, three types of geomorphology and three kinds of aspect ratio roof models are selected to study the characteristics of roof wind load through wind tunnel experiments, in order to determine the model of generalized force spectrum of pulsating wind, and at the same time to derive the analytical formula of equivalent static wind load on the basis of generalized force. The influence of different parameters on the equivalent static wind load is analyzed. The main work of this paper is as follows: (1) the effects of geomorphology and aspect ratio on wind load characteristics of flat roof are studied by wind tunnel experiment: average wind pressure, pulsating wind pressure, extreme wind pressure, wind pressure spectrum. The relationship between load characteristics is analyzed. (2) the characteristics of wind pressure spectrum and generalized force spectrum at various points under different geomorphology and ratio of length to width of building are studied and compared with the pressure spectrum of coming velocity. The fitting formula of generalized force spectrum of roof is obtained. (3) using generalized force spectrum fitting formula and frequency domain analysis method, the analytical expression of flat roof wind-induced vibration response is obtained, and the geomorphology is analyzed. The influence of aspect ratio on resonance response and background response. (4) according to the characteristics of wind-induced vibration response of structure, the analytical formula of equivalent static wind load is derived by the inertial force method. It is divided into two parts: average wind pressure coefficient and equivalent static wind load pulsating wind pressure coefficient. The influence of geomorphology and building aspect ratio on equivalent static wind load is studied, and the analytical formula of peak value C of pulsating equivalent wind pressure coefficient is given. According to the analytical formula of C, the standard value of wind load for the design of flat roof can be determined quickly and accurately.
【學位授予單位】:北京交通大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU312.1
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