在“双碳”战略背景下提出了一种新型装配式空心钢管混凝土支撑。为了研究其受力性能并将其应用于地下车站深基坑工程中，设计并加工了2个足尺寸空心钢管混凝土支撑试件，完成了轴压加载试验，2个支撑试件最后均发生了混凝土压碎破坏，同时得到了试件承载力指标。采用ABAQUS有限元软件建立了空心钢管混凝土支撑的数值模型，开展了考虑材料非线性和几何非线性的有限元分析，所得数值分析结果与试验结果吻合良好，验证了有限元模型的准确性。试验和有限元结果充分表明所提出的新型装配式空心钢管混凝土支撑满足常规工程设计要求，已成功应用于汤马区间2号风井工程，并与现浇钢筋混凝土支撑和装配式钢管支撑进行了比较分析，结果表明该新型支撑可以显著降低碳排放量和经济成本。

In view of the “Double Carbon” strategic background, a new type of assembled hollow concrete-filled steel tubular strut has been proposed. In order to investigate the load-carrying behavior of the strut and to facilitate the introduction into the deep foundation pit of underground stations, two full-scale hollow concrete-filled steel tubular struts were designed and manufactured, and were further tested to failure under axial compression. The two strut specimens experienced the concrete crushing failure, and the load-carrying capacities of the tested specimens were obtained. Elaborate finite element (FE) models of the hollow concrete-filled steel tubular struts were developed by using the ABAQUS software package. Numerical analysis taking into account both material and geometric nonlinearities was conducted, and the obtained numerical results were in good agreement with the obtained test data, verifying the accuracy of the developed FE models. It has been demonstrated by the obtained experimental and numerical results that the newly proposed hollow concrete-filled steel tubular struts could satisfy the design requirement of ordinary engineering applications, and have been successfully applied in the No. 2 ventilation shaft project of Tangma Interval. This new type of strut was also compared with the cast-in-stie reinforced concrete strut and the steel tubular strut, and it was indicated that the introduction of the new strut could lead to significantly reduced carbon emission and decreased economic cost.

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国家重点研发计划项目(2018YFC0808702); 国家重点研发计划项目(2019YFC0605100)