鋼桁梁抖振力空間相關(guān)性及氣動導(dǎo)納研究
[Abstract]:This paper reviews the development of wind-resistant research on long-span bridges, summarizes the current situation of buffeting analysis of long-span bridges and the existing problems, especially truss girder bridges. It is pointed out that the aerodynamic cross-direction correlation of the main girder and the aerodynamic admittance of the main girder are the important research directions of the detailed research on the buffeting of the truss girder bridge. Using wind tunnel test technique, the segmental aerodynamic forces of the main beam section of the truss beam with two scaling ratio models under two turbulent integral scales are obtained. The aerodynamic cross-section correlation and aerodynamic admittance of truss girder are studied by means of segmental aerodynamic force. The main contents of this paper are as follows: 1. This paper reviews the development of wind-resistant research of long-span bridges, especially the buffeting analysis of truss bridges and the existing problems. The research status and methods of pneumatic admittance are summarized. 2. In the wind tunnel, two kinds of turbulent field with different integral scale are simulated, and the statistical characteristics of the two kinds of turbulence are studied. The buffeting force measurement system of multi-balance truss beam is developed. At the same time, two high-frequency dynamic scales are used to study the variation of buffeting force along the span direction of two scale ratio model truss beams, and the statistical characteristics of buffeting force are analyzed. 4. Based on the aerodynamic history of each segment of the model, the cross-correlation of the buffeting force in the section of the truss beam is analyzed, and it is verified that the correlation of the buffeting force of the truss beam is greater than that of the pulsating wind speed. It is shown that the correlation of buffeting force expressed by pulsating wind speed correlation in current buffeting analysis methods can lead to unsafe results. The three-dimensional expression of aerodynamic admittance of truss beam section is obtained theoretically. Based on the cross-section aerodynamic correlation of truss beam, the aerodynamic admittance of cross-section of truss beam is calculated. In this paper, the concept of equivalent aerodynamic admittance of the main beam section of truss beam is proposed, and the aerodynamic admittance function of the main beam section of the truss beam in two turbulent flow fields is identified by two scaling ratio models. The equivalent aerodynamic admittance empirical formula of truss beam section with model characteristic size is summarized, and the difference between aerodynamic admittance function and Sears function of truss beam main beam section is discussed. Based on the buffeting force cross-direction coherence function and aerodynamic admittance function of truss beam, the buffeting frequency domain of truss girder bridge is calculated, and the effects of aerodynamic admittance and coherence function on buffeting response are analyzed.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:U441.3
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