【作者】 王晓芳；

【导师】 徐岳；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 自锚式悬索与斜拉组合体系桥是一种新型的缆索承重桥。本文以实桥工程为依托,进行了满载和偏载工况的模型试验。同时,基于结构空间几何非线性有限元分析理论,借助通用有限元计算程序,针对模型桥建立计算模型,采用模型试验与数值模拟相结合的方式,分析自锚式悬索与斜拉组合体系桥在汽车荷载作用下各构件的受力情况。主要研究内容如下:1)分析了自锚式悬索与斜拉组合体系桥几何非线性的主要影响因素,包括主缆与斜拉索自重垂度效应,大变形效应、初内力的影响以及弯矩与轴向力的组合效应,用非线性有限元理论对自锚式悬索与斜拉组合体系桥结构受力进行分析,在刚度矩阵中考虑上述几何非线性因素,并提出有限元中相应的处理方法。2)基于几何非线性有限元分析理论,采用MIDAS/Civil通用有限元计算程序,针对满载和偏载阶段试验模型建立有限元计算模型,对模型桥的主跨满载、全桥满载、主跨偏载和全桥偏载四个工况进行模拟,并作结构分析。3)在汽车荷载模型试验的基础上,将实测结果与模型计算结果进行对比分析,研究自锚式悬索与斜拉组合体桥在汽车荷载作用下各构件的受力性能、变形情况及整个结构的安全状况。更多还原

【Abstract】 The self-anchored cable-stayed susupension system-combined bridge is a new kind cable supported bridge. Supported by project of real bridge, the model test of full load condition and offset load is carried on. At the same time, the calculation model to the model bridge is set up by the general finite element computational software, based on the geometric nonlinear spece finite element models of theory. This paper adopts the medoth that model test combines with numerical simulation to annlyses the components of self-anchored cable-stayed susupension system-combined bridge’s force situation under vehicle load function. The mian research contents are as follows:1) this paper considers the four primary geometric nonlinearity factors of the cable sagging effect, the large deflection effect clue to changes in geometry, the influence of initial strains and axial forces’composite effect in rigidty matrix, and put forward the corresponding treatment method in the finite element.2) Based on the gemotric nonlinear spece finite element models of theory, the paper sets up the the finite element calculating model of full load test and offset load test by using the general finite element computational software MIDAS/Civil to simulate four condition of main span full load, full-bridge full load, main span offset load and full-bridge offset load, and carry on structural analysis.3) based on vehicle loading model testing, the paper compares measured results of model test and calculation results to trsearch the mechanical behavior, deformation conditions and satety condition of the bridge strucyure.更多还原