【作者】 秦泽豹；

【导师】 陈宝春；

【作者基本信息】 福州大学 ， 结构工程， 2003， 硕士

【摘要】 本文以钢管混凝土(单圆管)肋拱为研究对象，应用纤维单元模型的钢管混凝土应力—应变关系，通过钢管混凝土拱(单圆管)面内受力双重非线性有限元分析方法，对模型拱进行分析。结果表明，采用了纤维单元模型的钢管混凝土应力—应变关系的双重非线性有限元分析方法能较好地反映钢管混凝土拱受力全过程的非线性性能。分析还表明，钢管混凝土拱的受力应考虑双重非线性问题，其中材料非线性的影响要大于几何非线性的影响。 应用双重非线性有限元分析方法对钢管混凝土(单圆管)肋拱的受力全过程的非线性性能与极限承载力进行了参数分析。分析的参数有矢跨比、长细比、含钢率以及加载方式。分析结果可供提出极限承载力实用算法和工程应用参考。 针对铡管混凝土(单圆管)肋拱面内极限承载力的等效梁柱法，讨论了等效梁柱法的等效长度、作用力选取和钢管混凝土梁柱极限承载力计算方法的选用。与采用双重非线性有限元计算的极限承载力的比较表明，等效梁柱法能基本反映钢管混凝土(单圆管)肋拱极限承载力的基本规律，可供实际应用参考。更多还原

【Abstract】 Based on the summary of the completed four model tests of CFST ribbed arches, Through the method of analyze behavior of CFST (single tube) arch, Both the material and geometric nonlinear property are taken into account in the method, A fiber element model of stress-strain relation of CFST is used. Comparisons of numerical results with the test results indicate that, the method proposed herein can get out the basic mechanic behaviors of the steel tubular arch and CFST arch on the whole loading progress. The analyses of the nonlinear property of the CFST arch indicate that both the material and geometric nonlinearity take pole in the mechanic behaviors of CFST arch and the material nonlinear is more seriously than the geometric nonlinear.With the double non-linearity finite element program, whole behaviors of Concrete Filled Steel Tubular (CFST) arch bridges and their ultimate load-carrying capacity are analyzed. The parameters used in the analyses include rise to span ratio, slenderness ratio, steel ratio and load conditions. The results can be referred to put forward an applied arithmetic of the ultimate load-carrying capacity of CFST arch bridge and can be useful for practical engineering.Aim at the equivalent beam-column method to predict the planner ultimate load-carrying capacity of CFST (single) rib arch, The equivalent length, the applied load from which cross-section as the acted force and the calculation method of the ultimate load of CFST are discussed. Comparisons to the results from the dual-nonlinearity finite element method show that the predicted results by the equivalent beam-column method can follow basic rule of the ultimate loads in CFST (single) rib arch and can be refer to practice use.更多还原