预应力混凝土曲线箱梁桥试验研究

Research on the Test of Prestressed Concrete Curved Box-girder

设计4种荷载工况并合理布置测点,对预应力混凝土曲线箱梁桥进行实桥载荷试验,同时进行有限元建模分析,并将试验结果和有限元模拟结果进行比较。实桥载荷试验结果表明在对称荷载作用下曲线箱梁桥跨中截面内侧应力大于外侧应力;通过有限元模型对不同曲率曲线梁桥剪力滞效应的分析结果表明:跨中截面剪力滞系数在不同曲率下均为外侧小、内侧大的非对称分布,且随着曲率半径减小,非对称分布特征越加明显。

Four load conditions were designed and the reasonable measuring points were arranged in the prestressed concrete curved girder bridge, and results of the loading tests and these of the built finite element model analysis were analyzed and compared. The results of the bridge load testing show that with the effect of symmetrical loads the inside stress of the mid- span section is larger than that of the outside in the curved girder bridges.The result of the shear-lag effect analysis, using the finite element models with the different curvature curved girder, showed that the shear- lag coefficient was distributed asymmetrically with the characteristics of the outside is smaller and the inside is large in the mid-span section, and the asymmetric distribution became apparent with the decrease of curvature radius.