Study On Stability Capacity Of Cold-formed Thin-walled Steel Channels Reinforced With CFRP

To study the local stability bearing capacity of thin-walled C steel reinforced by CFRP,the eccentric compression loading test was carried out on the C steel with web plate and the flange position.The test is divided into long component of axial compression and short component of eccentric compression,a total of 14 specimens on the static load test.Seven axis compression member of root length is 1400 mm,the other seven roots for 750 mm long short of eccentric compression artifacts.To axial compression and bias artifacts,all have one for not paste CFRP contrast of artifacts,the remaining six components in C type steel inner and outer also affixed with a width of 50 mm CFRP cloth,paste spacing of CFRP into three kinds: 50 mm,100mm and 150 mm,CFRP layers have layer 1 and layer 2 two situation.Through the analysis of the experiment,it is indicated that the stable bearing capacity of the member is improved to a certain degree after the CFRP strengthened by the axial compression.After reinforced,the failure buckling shape did not change,all is due to the overall bending and twisting instability of artifacts in web lose continue carrying ability.When component paste 1 layer of CFRP,paste the spacing of 50 mm,100 mm and 150 mm component stability carrying capacity increased by 8.23%,8.23% and 8.23% respectively;When the 2 layer CFRP,the spacing of 50 mm,100mm and 150 mm components of the stability of the carrying capacity increased by 9.13%,6.97% and 4.67%.The analysis of the test results of eccentric compression members shows that the stable bearing capacity of the strengthened C steel is improved,without the use of the components of the CFRP reinforcement,the overall instability appears after local instability,the damage form of some members after reinforcement is opposite.The stability bearing capacity of the members before and after the contrast reinforcement is known,the stability bearing capacity of 50 mm,100mm and 150 mm components were increased by 5.8%,4.1% and 3.7%respectively.When the 2 layer CFRP,the spacing of the 50 mm,100mm and 150 mm components of the stability of the carrying capacity increased by 12.1%,6% and 5%.Through the analysis of test data,comparison of the paste spacing and paste layer effect on the reinforcement effect,the numerical simulation study on the strengthening of the finite element Ansys software is carried out,by comparing the experimental data and the results of finite element simulation shows that the two are in good agreement.The research results show that the CFRP reinforced cold bending thin wall C steel can improve the stability and bearing capacity of the axially compressed slender members;For eccentric compression members,the use of CFRP reinforcement can not only enhance the stability of the bearing capacity,but also can delay the occurrence of local instability.