Research progress on yield mechanism of RC frame structures
In view of the problem that most reinforced concrete frame structures have failed to achieve'strong columns and weak beams'in many major earthquakes over the years,combined with the background information of China's seismic code revisions since the 1980s,this paper evaluates the research results of yield mechanisms of reinforced concrete frame structures at home and abroad,as well as the evolution of relevant regulations in the code.Firstly,the research background and relevant provisions of the GBJ 11-1989 about beam-column joints in frame structures are introduced.Secondly,the seismic damage phenomena and characteristics of some strong epicenter frame structures at home and abroad since the 21st century are summarized,several reflective research achievements in engineering and academia after earthquakes and relevant regulations at home and abroad are analyzed.Thirdly,based on the latest research trends on the yield mechanism of RC frame structures,the material constitutive equations at the micro level and the physical equations of components at the macro level are analyzed.Finally,it is pointed out that the capability design method based on the strength criterion has obvious defects in theory,and the overall yield mechanism of RC frame structures should be studied based on deformation failure criteria.In view of the problems existing in seismic design methods,this article proposes that the ratio of deformation capacity and demand can be used as index,which fully considers the component stiffness configuration and the influence of local stiffness degradation on internal force redistribution in the process of structural failure evolution,and theoretical and experimental research should be carried out from the node,component,and structural levels to comprehensively construct a new capacity design method based on deformation criteria.
RC frame structureyield mechanismdeformation criterionratio of deformation capacity and demandcapacity design method
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