考虑扭矩的复杂受力状态下圆钢管混凝土 研究进展与承载力计算模型

Concrete-filled steel tubes (CFSTs) have excellent mechanical properties and construction efficiency, which have been widely used in large-scale engineering structures such as high-rise buildings and large-span bridges. In practical engineering, the CFST structures may be subjected to complex loads involving torsional loads due to factors such as engineering structural design and construction sites, which require attention. This paper summarized the scenarios of typical CFST structures under complex loads involving torsional loads, and analyzed the research progress on the mechanical properties of circular CFST members under complex loads involving torsional loads at home and abroad. An experimental database for circular cross-sectional CFSTs under complex loads was established. Hereby, the existing bearing capacity calculation models were verified and analyzed, with the proposal of corresponding design suggestions. The investigated results indicate that the mechanical properties of CFST members under complex loads have particularities, such as complex testing devices, high difficulties in revealing working mechanisms, and strong coupling correlations of bearing capacity. The existing investigations have formed a certain foundation, but further work is still needed to solve problems such as limited experimental data, in-depth analysis of the composite working mechanism, and improvement of the accuracy of the bearing capacity calculation models.