Research On Pull-out And Shear Performance Of Box Connector On Bhouse Structure

Residential industrialization is the development direction of residential construction in China,and the fully assembly concrete wallboard structure system is a multi-storey residential structure system adapted to China's national conditions,which has good development prospect.For the fully assembly structure,the reliable connection between prefabricated parts is the key to guarantee the integrity and seismic performance of the structure.This thesis takes the wall panel components of a company's serial products as the research object,the performance of the prefabricated concrete wallboard structure has made the detailed analysis.The main research contents are as follows:1.Analysis and evaluation of the anti-pulling capacity of the fully assembly wall panel structure.The main purpose of the test is respectively to investigate buries the sleeve end connected to the embedded box of the ultimate pull-out bearing capacity,the analysis of the weak link for the whole structure,focus on connecting device the stress variation in the mechanical parts.On the basis of the test results of the connecting device,the mechanism of the anti-pulling failure of the connecting device is preliminarily analyzed.2.Analysis and evaluation of shear bearing capacity of the fully assembly wall panel structure connecting interface.Test under different working conditions,the main goal is to investigate the shear bearing capacity of the component interface and studied,including horizontal one-way loading shear and horizontal low cyclic reciprocating loading shear connection bolt strength grade under two kinds of load conditions,combinations of axial compression ratio,components of fully assembled wallboard structure connection interface shear bearing capacity.Based on the results of the interface shear test,the failure mechanism of the interface shear resistance is preliminarily analyzed,and the experimental value is compared with the calculated value of the interface shear capacity according to the existing code.3.Consider the fine finite element analysis model of the fully assembly wall panel structure with bonding and slip.Using the large general finite element software ABAQUS respectively for embedded sleeve end,buries the connection box end pulling finite element analyses,the existing fully assembled wallboard structure horizontal one-way load and horizontal low cycle loading under the action of shear finite element analysis.By comparing with the experimental data,the parameter selection of the finite element and the rationality of the interface spring simulation are verified.On this basis,parameter analysis is carried out to study the effect of the axial compression ratio and the strength grade of connecting bolt on the structural performance of the fully assembly concrete wallboard.4.Optimized design of box-type connectors for the fully assembly wall panel.In the experimental data and based on the theory of the bond-slip ABAQUS finite element based on the analysis of the model,by adjusting the parameters of the model,including the change of u-shaped steel sleeve end anchorage length,the diameter of the u-shaped steel,change the connection box end change the strength level of the connecting bolt,comprehensive optimization have been used to design parameters of fully assembled concrete wallboard structure connection device.Assessing pull-out and shear resistance of the specimens after optimization,and checking the pull-out and shear capacity of the whole structure with the structural design software PKPM have been done.Research provided the theory basis for the enterprise to develop fully assembled wallboard structure with higher cost performance.