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SUMMARYThis paper presents experimental information on the behaviour of sandwich box columns subjected to combined bending and axial loading. The sandwich box columns consisted of double thin-walled steel tubes with concrete between them. Owing to the interaction between steel and concrete, the composite members performed in a ductile manner during testing. Test results show that high strength/mass ratio characteristics were maintained, and the goal of obtaining signi"cant member ductility was also achieved. The contribution of concrete to member performance was found to be more signi"cant for members with higher steel width/thickness ratios.

High-quality development has become a popular term to describe China's development. From the perspective of social hot issues and bibliometric analysis, this paper uses the method of SNA (Social Network Analysis) to sort out, dig and analyze the literature related to "high-quality development." The results show that there is a close relationship between "high-quality development," "high-quality economic development" and "high-quality urban economic development," which are the best answers to the questions of why high-quality development is important in China. This study, through literature review and analysis, clarifies the logical concept of the academic research on "high-quality development," which will provide reference and important guidance for further research on "high-quality development."

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