Behavior of CFDST stub columns under preload, sustained load and chloride corrosion
Behavior of CFDST stub columns under preload, sustained load and chloride corrosion
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CFDST 短柱在预载、持续载荷和氯化物腐蚀下的行为
DOI：
10.1016/j.jcsr.2014.12.023
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发表时间：
2015-04-01
影响因子：
4.1
通讯作者：
Zhao, Xiao-Ling
中科院分区：
文献类型：
--
作者：
Li, Wei;Han, Lin-Hai;Zhao, Xiao-Ling
在实际应用中，对于双壁钢管混凝土柱，在施工阶段，内外空心管都受到施工荷载的作用；在服役阶段，组合截面主要受压。如果在海洋结构中使用，外层钢管也会受到氯离子腐蚀。然而，关于钢管混凝土柱在空心管预压、组合截面持续荷载和外管氯离子腐蚀共同作用下的结构性能的研究还很有限。在这项研究中，建立了一个有限元分析(FEA)模型来预测CFDST短柱的结构性能，考虑了这些因素，其中考虑了混凝土在持续荷载下的长期效应。对相应加载方案下的CFDST短柱进行了试验研究，并利用试验结果对数值模型进行了校核。讨论了考虑这些因素和不考虑这些因素时试件的差异。结果表明，在加载的各个阶段，有限元模型的计算结果与实测值基本吻合。外层钢管锈蚀导致柱子强度大幅度降低，预压和长期持续荷载的影响可以通过不同系数的乘积来初步估计。(C)2015爱思唯尔有限公司。保留所有权利。
For a concrete-filled double skin steel tubular (CFDST) column in practice, during the construction stage, both the inner and the outer hollow tubes are subjected to the constructional load; during the service stage, the whole composite cross-section is mainly subjected to compression. If it is used in offshore structures, the outer steel tube is subjected to chloride corrosion as well. However, the information is still limited on the structural behavior of CFDST columns under the combination of preload on hollow tubes, the sustained load on the composite cross-section and chloride corrosion on the outer tube. In this study, a finite element analysis (FEA) model is developed to predict the structural behavior of CFDST stub columns with considerations of these factors, where the long-term effect for concrete under sustained load is applied. The experimental work is also conducted for CFDST stub columns subjected to corresponding loading protocols, and the test results are used to calibrate the numerical model. Discussions are made on the differences of specimens with and without considerations of these factors. It has been found that, the results from the verified FEA model have generally good agreement with measured results in all loading stages. The corrosion of outer steel tube leads to a large reduction of column strength, and the influences of the preload and long-term sustained load can be tentatively estimated by multiplying different coefficients together. (C) 2015 Elsevier Ltd. All rights reserved.