短懸臂斜拉橋主梁正應(yīng)力分布試驗研究
發(fā)布時間：2018-09-04 19:42
【摘要】：寬跨比大于0.5或高跨比大于0.2的梁按簡單梁理論計算的正應(yīng)力誤差較大,因而分析短懸臂主梁的受力性能時,應(yīng)考慮橫向彎曲效應(yīng)。為了研究短懸臂斜拉橋主梁橫向彎曲變形對正應(yīng)力的影響,定義了正應(yīng)力不均勻系數(shù),并對寬跨比1∶1的有機玻璃節(jié)段模型進行荷載橫向?qū)ΨQ變位試驗,采集索力及應(yīng)變增量數(shù)據(jù)進行分析。試驗和有限元數(shù)據(jù)對比,可知:荷載橫向不同作用位置對索力及剪力滯的影響很小,其引起的頂板橫向彎曲變形會改變加載截面附近正應(yīng)力的大小和分布規(guī)律;橫彎效應(yīng)對正應(yīng)力的影響往自由端逐漸衰減,往固定端先減小后增大;塔根附近主梁應(yīng)力的大小及不均勻程度與無橫彎影響的結(jié)果相差很大。
[Abstract]:The normal stress error calculated by simple beam theory is larger for beams with width-span ratio greater than 0.5 or higher than 0.2 for high span ratio, so the transverse bending effect should be taken into account in the analysis of the mechanical behavior of short cantilever main beams. In order to study the influence of transverse bending deformation on normal stress of main girder of short cantilever cable-stayed bridge, the non-uniform coefficient of normal stress is defined, and the lateral symmetrical displacement test of plexiglass segment model with 1:1 aspect span ratio is carried out. The data of cable force and strain increment were collected and analyzed. Compared with the finite element data, it can be seen that the transverse position of load has little effect on cable force and shear lag, and the transverse bending deformation will change the magnitude and distribution of normal stress near the loading section. The effect of transverse bending on the normal stress gradually attenuates to the free end, decreases first to the fixed end and then increases, and the magnitude and inhomogeneity of the stress in the main beam near the tower root are very different from the results without the effect of transverse bending.
【作者單位】： 中南大學(xué);三峽大學(xué);中交第二公路勘察設(shè)計研究院有限公司;
【基金】：國家自然科學(xué)基金面上項目(51378501,51578547)
【分類號】：U448.27
[Abstract]:The normal stress error calculated by simple beam theory is larger for beams with width-span ratio greater than 0.5 or higher than 0.2 for high span ratio, so the transverse bending effect should be taken into account in the analysis of the mechanical behavior of short cantilever main beams. In order to study the influence of transverse bending deformation on normal stress of main girder of short cantilever cable-stayed bridge, the non-uniform coefficient of normal stress is defined, and the lateral symmetrical displacement test of plexiglass segment model with 1:1 aspect span ratio is carried out. The data of cable force and strain increment were collected and analyzed. Compared with the finite element data, it can be seen that the transverse position of load has little effect on cable force and shear lag, and the transverse bending deformation will change the magnitude and distribution of normal stress near the loading section. The effect of transverse bending on the normal stress gradually attenuates to the free end, decreases first to the fixed end and then increases, and the magnitude and inhomogeneity of the stress in the main beam near the tower root are very different from the results without the effect of transverse bending.
【作者單位】： 中南大學(xué);三峽大學(xué);中交第二公路勘察設(shè)計研究院有限公司;
【基金】：國家自然科學(xué)基金面上項目(51378501,51578547)
【分類號】：U448.27
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