|Alternative Title||Research on shear behavior of concrete-filled steel tubular members with internal profiled steel|
|Place of Conferral||兰州|
|Keyword||内配型钢钢管混凝土 受剪力学性能 试验研究 数值模拟 工作机理|
Concrete-filled steel tubular (CFST) structures with internal profiled steel are used widely in practical engineering for its excellent mechanical performance for high-rise buildings, long span and heavy loading structures. It is significant to figure out the mechanical behavior and design theory and approaches of this new type of CFST members under various loadings. At present, even though some investigations of CFST members with internal profiled steel have been conducted under axial compression, compression with bending and pure bending, there are few studies on the shear behavior of this new type of members.The shear behavior of CFST members with internal profiled steel was studied by experimental research, numerical simulation and theoretical analysis in this thesis. The investigation objects include concrete-filled circular or square tubular members with I-profiled or cross-profiled steel and concrete-filled rectangular tubular members with I-profiled steel, respectively. The main research work are listed as follows.
(1) Experiments of 50 concrete-filled circular, square and rectangular tubular members with I-profiled or cross-profiled steel under lateral shear loading were conducted to investigate shear capacity and failure modes of these members. The effect of various parameters including shear to span ratio, type and area of profiled steel, cross-section of steel tube on failure mode, carrying capacity and deformation characteristics of these composite members were discussed. In additionally, the shear performance of 8 concrete filled rectangular steel tubular members without end-plate was tested, and the influential parameters of the sectional size and shear to span ratio on shear capacity and slip behavior were studied.(2) The numerical models of CFST members with profiled steel under shear loading were developed in ABAQUS and these models were calibrated by experimental results from other researchers and this thesis. The simulation results are consistent with the test results in terms of the load-deformation relation and failure mode, which indicate that these developed numerical models can give reliable predication of the mechanical behavior of these composite members under shear loading.(3) Based on the developed numerical models, the mechanical behavior and mechanism of CFST members with internal profiled steel under shear loading was investigated systematically. In addition, the research included the analyses of distribution and development of normal stress and shear stress of different components such as tubes, internal profiled steel and concrete at different locations, the comparison of failure modes of steel tube, CFST members and CFST members with internal profiled steel and the individual loading capacity analyses of each part in CFST members with internal profiled steel. Moreover, interaction between steel tubes and concrete and between internal profiled steel and concrete were studied. All these analyses revealed the mechanism of CFST members with internal profiled steel under shear loading.(4) The effects of yield strength and steel ratio of internal profiled steel, concrete cubic compressive strength, yield strength and confinement coefficient of steel tube on shear capacity of CFST members with internal profiled steel were investigated. Then the effect patterns were understood in the parametric analysis. Based on the results obtained from lots of multi-parameter numerical simulations, a practical calculation method for the shear capacity of concrete-filled steel tubular members with internal profiled steel was proposed by regression analysis. It was verified by the results of tests and numerical models. The calculation formula of shear capacity of concrete-filled steel tubular members with internal profiled steel can be used as a reference for relevant engineering structures.
|史艳莉. 内配型钢钢管混凝土构件的剪切力学性能研究[D]. 兰州. 兰州大学,2018.|
|Files in This Item:||There are no files associated with this item.|
|Recommend this item|
|Export to Endnote|
|Similar articles in Google Scholar|
|Similar articles in Baidu academic|
|Similar articles in Bing Scholar|