| At present,the mainstream of the development of the international residential building industry is residential industrialization.PC-GRC construction elements perfectly combine the rich expression and decoration of GRC's surface with the reinforced concrete structure layer to achieve the integration of architectural decoration and maintenance.However,as concrete and GRC are two materials of different properties,the weak link is still the cementing surface after they are bonded together.The quality of cementation surface directly affects the normal function and safe performance of the whole prefabricated building,and also determines the economic benefit and social benefit of the huge construction cost.Based on the background of "research and demonstration of key technologies for highly efficient construction of prefabricated concrete industrial buildings",a series of experiments on the failure mechanism of PC-GRC construction element's cementation surface were carried out in this dissertation.This dissertation systematically expounds the experimental study of size,test procedure,test data acquisition and processing,etc,strictly following the normal concrete mechanics performance test method standard "relevant provision,and the experiment was conducted by using the theory of plastic limit based on the PC-GRC component adhesive direct shear strength limit analysis and with the aid of numerical analysis of ABAQUS software,the real test results and simulation results are analyzed in comparison.The main work and conclusions are as follows:(1)The basic mechanical tests of 9 groups of concrete and PC-GRC at the age of 28 days were carried out,which are compressive strength,compressive strength and elastic modulus respectively.(2)12 groups of PC-GRC construction members' bonding direct shear strength performance tests were conducted,considering the factors of different treatment methods of the cementation surface(i.e.bare joint,drawing and wire mesh)and pc-grc construction member with different thickness(i.e.GRC of 10 mm and 15mm).The results show that under the three treatment methods,the direct shear strength of the bond is better than that of the wire mesh and the bare joint.The thickness of GRC decorative layer has little effect on the bonding strength of pc-grc construction member.(3)Based on the bond strength performance test of PC-GRC construction member,the direct shear failure mechanism of pc-grc members was proposed,and the theoretical formula of the direct shear strength of PC-GRC construction member was derived by using the Mises yield condition and the upper bound theorem in the plastic limit analysis.The theoretical limit shear strength value was obtained by using the derived formula and the assumed conditions,and the comparison between the theoretical limit shear strength value and the experimental original data showed that the average value of direct shear bond strength under different bonding treatment methods and the thickness of GRC layer was greater than the theoretical limit shear strength value,indicating that the bonding strength of PC-GRC members was better in engineering practice.(4)According to PC-GRC construction element's mechanical characteristics of direct shear bond strength test,puts forward using spring element to simulate the PC-GRC's cementation plane,PC-GRC construction element will test measured in local bond-slip constitutive relation rewrite ABAQUS software INP file program as a nonlinear spring stiffness,through calculation results and the experimental results,the result shows that experimental data and destruction form and the simulation results of basic consistent,finite element model is feasible,providing strong reference for PC-GRC construction element's stress analysis.Figure [88] table [7] reference [72]... |
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