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介绍钢管混凝土圆拱的耐久性能分析和稳定性评估。对受中心荷载作用的铰支拱和固支拱进行线性和非线性分析。分析评估混凝土芯的徐变和收缩、面内变形、内力和面内屈曲荷载的重要影响,并通过有限元结果进行验证。比较线性和非线性分析的结果,两者在变形和荷载能力方面的变化范围明显不同。为了结构安全起见,采用更为可靠的非线性分析来进行钢管混凝土拱的长期性能分析和稳定性评估。因此,尽管线性屈曲分析能够预测铰支钢管混凝土深拱的面内屈曲荷载,在设计时也应使用非线性屈曲分析来评估铰支和固支钢管混凝土扁拱的长期正常使用极限状态。
Durability analysis and stability evaluation of CFST round arch. Linear and nonlinear analysis of hinged arch and retaining arch subjected to central load. The important influence of creep and shrinkage, in-plane deformation, internal force and in-plane buckling load of concrete core is analyzed and evaluated, and verified by finite element results. Comparing the results of linear and nonlinear analyzes, the range of variation in both deformation and load capacity is significantly different. For structural safety, more robust nonlinear analysis is used to perform long-term performance analysis and stability assessment of CFST arch. Therefore, nonlinear buckling analysis should be used to evaluate the long-term normal service limit state of hinged clamped and clamped concrete-filled steel tube arch arches, even though the linear buckling analysis can predict the in-plane buckling loads of the deep-arched steel tube concrete arch.