The work aims to study the mechanical properties of recycled concrete filled steel tubular short columns with built-in CFRP tubes under different cross-section forms.The finite element software was used to establish the specimen model to verify the correctness of the model.On this basis,the composite short column model was established to analyze the effects of CFRP layer number,steel tube thickness and recycled aggregate replacement rate on the mechanical properties of composite columns under different cross-section forms.The results show that increasing the number of CFRP layers and the thickness of steel tube can improve the ultimate bearing capacity and displacement ductility coefficient of composite short columns.Changing the replacement rate of recycled aggregate has little effect on the mechanical properties of composite short columns.By changing the section form,the mechanical properties of circular section short columns are better than those of square section short columns.In engineering design,it is suggested that two layers of CFRP should be built in the composite column when using the composite short column,and the circular section should be given priority to in the section form.If it is necessary to improve the bearing capacity of the composite column,it is recommended to increase the thickness of the steel tube.
关键词
外截面形式/CFRP层数/钢管厚度/再生骨料取代率
Key words
external section form/the number of CFRP layers/recycled aggregate replacement rate/steel tube thickness
维普
万方数据