| Assembled RCS composite frame structure is the abbreviation of assembled reinforced concrete column-Steel Beam-combined frame structure,which is assembled on site by prefabricated reinforced concrete columns and steel beams,and Important branch of assembled structural system.It can make full use of the advantages of steel and reinforced concrete members,is a low-cost,high-efficiency structural form,in line with the development trend of building industrialization,and has broad application prospects.The prefabricated RCS composite frame structure is different from the cast-in-place concrete frame structure or steel frame structure due to its special structural form.The rotation stiffness and plastic deformation capacity of the beam-column joint are the factors affecting the resistance of the assembled RCS composite frame structure.The key to continuous collapse performance.Based on this,the main work and conclusions of this article are as follows:(1)Based on the requirements of simple construction,reliable connection,clear force transmission,and simple structure of the assembled RCS composite structure,three new assembled RCS beam-column joints were proposed,and the test models of the three assembled RCS beam-column joints were designed and produced to develop resistance Continuous collapse static loading test.(2)The test results such as load,section strain and vertical displacement of the specimen are sorted out and analyzed.The results show that the three new beam-column joints of the assembled RCS composite frame structure have high collapse resistance,and the joints are reliable and the bearing performance is good.(3)In the beam-column full-section splicing design,the influence of the widening of the beam flange in the node area on the collapse resistance of the model was discussed.The results show that not only the carrying capacity of each stage is improved,but also the beam mechanism stage is extended,the suspension mechanism stage resistance is improved to a certain extent,and the node area rigidity is enhanced.(4)Based on the conversion process of load and section strain and the resistance development curve,the influence of different mechanical properties of the beam-column joints on the continuous collapse resistance mechanism is revealed.The results show that the development of the continuous collapse resistance mechanism of full-section splicing and top-bottom angle-bolt connection is significantly different.In contrast,the latter only has a beam mechanism that is slightly higher than the former,but the suspension mechanism develops earlier and more fully.(5)Through the ABAQUS finite element software,the load-curve and failure modes are verified,and the test and the finite element results are in good agreement.Further,the effects of bolt preload and right angle stiffeners on the ability to resist continuous collapse were studied.The results show that increased bolt preload can effectively increase the stiffness of the node area,but the effect on resistance to continuous collapse is minimal.The presence of right-angle stiffeners not only significantly improves its ability to resist collapse,but also enhances the rigidity of the node area. |
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