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Research On Strong Column-weak Beam Design Methods Of Reinforced Concrete Column-Steel Beam(RCS) Composite Frame

Posted on:2018-06-14Degree:MasterType:Thesis
Country:ChinaCandidate:H LiFull Text:PDF
GTID:2322330533468186Subject:Structural engineering
Abstract/Summary:PDF Full Text Request
RCS Composite Frame is an inheritance and development of steel structure and reinforced concrete structure.RCS Composite Frame make full use of the material properties and have good anti-seismic performance,is a kind of high performance structure.At present,there are many studies on the RCS composite joints,but the research on RCS composite frame overall mechanical properties and yield mechanism is less,especially for the RCS composite frame structure of strong column-weak beam impact factors and the mechanism of strong column and weak beam mechanism method and design method,there is no clear results and specification.This paper has designed 5 RCS floor space beam column specimens and 1 RCS plane beam column subassemblage,design variables are effective flange width w and the column to beam flexural bearing capacity ratio coefficient ?c-bua.Six specimens were using cylindrical steel plate,the node area of flat steel hoop shear stud and structural measures to ensure that the shear capacity of the connection.The effect w and ?c-bua on RCS composite frame structure? yield mechanism based strong joint.Through the low cyclic loading tests of 6 specimens,the yield and the degree of order analysis of steel beam,column and slab reinforcement,combined with the development state of plate and column end crack,integrated to determine the different design parameters on failure mechanism of the.Analysis of hysteretic curve,skeleton curve,bearing capacity degradation curve,investigation of the influence of the ratio of the specimen seismic bearing capacity of beam column.The main conclusions are:(a)when the plate width,c-bua were 1.2,1.4 and 1.6,the specimen failure mechanism are beam mixed failure and incomplete "strong column and weak beam" destruction and completely "strong column weak beam" failure.(b)with the increase of the bearing capacity of beam column ratio,the bearing capacity of the specimen increased slightly,and improve the bearing capacity,energy dissipation capacity and ductility degradation is relatively poor.(c)the ductility coefficient of 6 RCS specimens is more than 3,regardless of the occurrence of the damage,and the lateral displacement angle between 1/91-1/73 and 1/28-1/23 is between the layers.The half cycle energy consumption,cumulative energy dissipation and equivalent viscous damping coefficient of the specimens were analyzed.The results show that the RCS specimens have good seismic performance.On the basis of experimental research,using ABAQUS finite element software,more than 3 specimens were modeled and analyzed the flexural bearing capacity of different columns,the hysteretic curves and skeleton curves,the results show that the finite element simulation of the peak load,the ultimate load in good accordance with the test results.Replacement of 1.1,1.8 than for the finite element analysis of the bearing capacity of beam column,the results show that the two cases were observed in the "strong beam weak column" and "strong column weak beam failure.Experimental study and finite element analysis based on the results,given the RCS hybrid frame structure under different seismic grade when the beam flexural capacity ratio,namely the moment augment factor of column values.The design and calculation method of "strong column weak beam" mechanism of RCS hybrid frame structure is proposed.
Keywords/Search Tags:RCS composite frame, strong column-weak beam, failure mechanism, the flexural bearing capacity of column beam ratio, design method
PDF Full Text Request
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