π型梁曲線斜拉橋彎梁效應(yīng)閾值分析研究
[Abstract]:The main beam of curved cable-stayed bridge has obvious characteristics of curved beam bridge, and at the same time it is multi-statically indeterminate spatial cable-bearing system. Therefore, the force of curved cable-stayed bridge is very complex and has a high spatial character. Due to the existence of curvature, curved cable-stayed bridge must have bending and torsional coupling effect. When the curvature of the curved cable-stayed bridge is small, the bending-torsion coupling effect of the main beam is not obvious, and the mechanical behavior of the curved cable-stayed bridge is not much different from that of the linear cable-stayed bridge with the same span. If the curvature is large, the coupling effect of bending and torsional of the main beam is obvious, and the torque may be too large and the support is empty. At this time, the structure can not be designed according to the linear cable-stayed bridge. Based on the actual engineering project of curved cable-stayed bridge along Brazzaville River Avenue in Africa, this paper uses the professional finite element software Midas/Civil to simulate and calculate the curved beam effect of curved cable-stayed bridge, and studies the threshold value of curved beam effect of curved cable-stayed bridge. The main work contents are as follows: 1. The structural analysis theory of curved beam bridge and cable-stayed bridge is analyzed and studied. On this basis, the calculation theory and analysis method of curved beam effect threshold of curved cable-stayed bridge are summarized. 2. The sensitivity of static index to curvature radius and arc length is analyzed, and the threshold value of curved beam effect of curved cable-stayed bridge is established. 3. It is analyzed that the curved cable-stayed bridge can be designed according to the upper limit threshold of bending beam effect in the design of linear cable-stayed bridge and the lower limit threshold of bending beam effect in the design of linear cable-stayed bridge. The influence of the uncertain parameters of the structure on the threshold of bending beam effect is analyzed. 4. The threshold of bending beam effect of curved cable-stayed bridge under different arc length and tower height parameters is studied, and the relationship curve and formula between bending beam effect threshold and arc length and tower height are given.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U448.27
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