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首页> 外文期刊>Journal of bridge engineering >In-Plane Stability of Fixed Concrete-Filled Steel Tubular Parabolic Arches under Combined Bending and Compression
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In-Plane Stability of Fixed Concrete-Filled Steel Tubular Parabolic Arches under Combined Bending and Compression

机译：钢管混凝土抛物线形结合弯曲与压缩的平面内稳定性

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摘要

The current codes and specifications use the equivalent beam-column method to predict the in-plane stability capacity of concrete-filled steel tubular (CFST) arches. Using this method, the effects of the rise-span ratio and the nonuniform moment on the stability capacity of CFST parabolic arches are not considered. This may induce a difference between calculation results and actual structural stability capacity. To study the effects of the rise-span ratio and the nonuniform moment, six fixed CFST parabolic arches, with rise-span ratios of 1/4.5, 1/6, and 1/9, were tested and analyzed in this study. The failure patterns and mechanisms were studied. The confining effect of the steel tube to the concrete at failure was investigated. The influence of the rise-span ratio and loading conditions on the in-plane stability of fixed CFST arches was also considered. A nonlinear elastic-plastic finite-element (FE) model was used to predict the buckling behavior of the fixed CFST parabolic arches. Based on the test and the FE results, a design equation is proposed for the design of in-plane stability of fixed CFST parabolic arches under combined bending and compression. (C) 2016 American Society of Civil Engineers.
机译：当前的规范和规范使用等效的梁柱法来预测钢管混凝土（CFST）拱的面内稳定能力。使用这种方法，没有考虑升跨比和不均匀矩对CFST抛物线拱稳定性的影响。这可能会导致计算结果与实际结构稳定能力之间的差异。为了研究上升跨度比和不均匀矩的影响，在本研究中测试并分析了六个固定的CFST抛物线拱，其上升跨度比为1 / 4.5、1 / 6和1/9。研究了失效模式和机理。研究了钢管在破坏时对混凝土的约束作用。还考虑了升跨比和加载条件对固定CFST拱的面内稳定性的影响。非线性弹塑性有限元（FE）模型用于预测固定CFST抛物线拱的屈曲行为。根据试验结果和有限元分析结果，提出了一个设计方程，用于设计固定式CFST抛物线拱在弯曲和压缩作用下的面内稳定性。 （C）2016年美国土木工程师学会。

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