钢管混凝土高墩非线性稳定承载能力可靠度分析

为解决结构分析准确性与消耗机时的矛盾,使非线性可靠度分析方法具有工程应用价值,基于响应面与非线性有限元相结合的方法,运用一致缺陷模态法考虑结构的初始几何缺陷,建立了钢管混凝土结构非线性承载能力可靠度分析模型。利用该模型分析钢管混凝土超高墩的非线性承载能力可靠度指标与敏感性系数。通过参数分析方法,系统研究了长细比,偏心距,径厚比,几何非线性与初始几何缺陷对可靠度指标的影响。可以通过对上述因素的有效控制影响钢管混凝土高墩的可靠性。在此基础上,给出了能够有效提高钢管混凝土高墩承载能力可靠度工程措施建议。

Reliability Analysis of Ultimate Bearing Capacity of Concrete-Filled Tube High Piers

To deal with the contradiction between accuracy and time consuming,a model of reliability analysis of CFT was proposed based on the response surface and nonlinear finite element method,And Initial geometric imperfection was induced by consistent mode imperfection method.The reliability index and sensitivity coefficients of CFT high piers were invested by the proposed model.The effects of slenderness,eccentricity and diameter-thickness ratio on reliability index of concrete-filled tube high piers were studied by parameter analysis method.Meanwhile,the influence of geometric nonlinearity was also analyzed and the reliability of CFT high pier could be affected by factors mentioned above.Based on the analysis,several suggestions for improving the reliability of CFT high piers were proposed.