| The reinforced concrete slab-column structure has been extensivelydeveloped and widely applied since it appeared with a variety of advantages.Since the slab-column structure is applied, the floors clear height becomes larger,the structure becomes simpler, load transfer is more concise, the formwork isreduced during the process of construction, the floors are smoother, the layout ofcomponents is more flexible and engineers can achieve greater outlook of thearchitecture. Accompanying with a variety of advantages, the disadvantages ofslab-column structure are also obvious. The vital one of them is the punchingshear damage issue of the structure nodes. Punching shear damage is a suddenfragile damage which may probably lead to continuous collapse of the structureand result in disastrous consequences. So, the crisis is to protect the structurefrom punching shear damage. A lot of researchers from various countries haveattained a large amount of research results in punching shear damage in recentone hundred years. A summary of the anti-punching theory of the slab-columnstructure is made based on the previous studies in this paper. Further, the impactof built-in steel shear frame to the anti-punching shear performance of theslab-column structure is proposed based on test and finite element analysis, anda primary formula of capacity calculation is also proposed. Specifically, theresearch job in follow aspects is carried out:(1). Study in the types of the punching shear damage, classify the punchingshear damage further and describe the damage mechanism and the damageprocess of each damage type based on previous research conclusions. And thenormal measures in actual engineering applied to improve the anti-punchingshear performance of the slab-column structure are also concluded.(2). The static load carrying capacity test of the slab-column structure of theMingshen Square in Guangzhou is introduced. According to the test figures, theload carrying and deformation capacity of the slab-column structure of the building is analysed, finally the slab-column structure with built-in steal shearframe is verified that it has a good performance under the affection of staticload.(3). According to the field test, the finite element analysis softwareABAQUS is used to established the finite element model of the field test andanalysed the model. By comparing the analysis data with the test data, thecorrection and accuracy of the finite element method are verified. The weaknessof the slab-column structure existing in the part of nodes is also figured out.(4). The finite element analysis software ABQUS is used to establish asimplified finite element model of a slab-column node sized in1400mm×1400mm to simulate the process of punching shear damage. Inaddition to several key influence factors, the impacts of the built-in steel shearframe to the anti-punching shear capacity is placed extra emphasis on during theanalysis. Based on the finite element analysis data, the data regression analysisis proceed. The formula to calculate the punching shear bearing capacity of thereinforced concrete slab with built-in steal shear frame is given based on theformula of the reinforced concrete slab in the Chinese concrete structure designcode published in2010. |
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