| The research and development of high-performance building exterior retaining walls is a problem that domestic engineering circles have been paying close attention to and urgently need to solve.In this thesis,a new type of prefabricated surfacereinforced foamed ceramic wallboard has been developed.The foamed ceramic board is prepared from industrial waste such as ceramic waste.The foamed ceramic board with embedded steel mesh is reinforced with a high-performance mortar surface layer.It forms a co-stressed wall panel,which has the functions of integrating structure,enclosure,heat preservation and decoration.The experimental and theoretical research on the out-of-plane force performance of the composite wall panel is carried out.The main work and contributions are as follows:1.A light steel-foamed ceramic bolt joint was developed,and 21 different structures of light steel-foamed ceramic bolt joints were tested for the pull-out performance and 17 different structures of light steel-foamed ceramic bolt joints for shear resistant performance.The bearing capacity,damage process and failure form were analyzed,and the force transmission mechanism of light steel and foamed ceramics working together through bolted connection was clarified.2.A surface layer-enhanced foamed ceramic plate was developed,and 15 different structures of foamed ceramic plates and surface-enhanced foamed ceramic plates were tested for out-of-plane force performance.And the bearing capacity,stiffness,the damage process and failure morphology were analyzed.The force transfer mechanism of the high-performance mortar surface working together with the foamed ceramic was clarified.3.Based on the test,the finite element analysis model of the surface layerenhanced foamed ceramic plate was established.Using the ABAQUS software and the actual loading method,the whole process of the nonlinear finite element numerical simulation of the specimen was carried out.Damage evolution process and failure mechanism of foam ceramic plates under out-of-plane force were revealed.4.Based on the test and finite element analysis,the calculation model of the bearing capacity of the surface reinforced foamed ceramic plate and the calculation model of the node bearing capacity are established,and the calculation results are in good agreement with the test.Constructive measures are proposed.Main conclusions:(1)The newly studied surface layer-reinforced foamed ceramic plate has a reasonable structure and good out-of-plane force performance.The studied and developed light steel-foamed ceramic bolt joint has a reasonable design,and is safe and reliable.(2)Compared with the specimen without embedded steel mesh,the foamed ceramic plate specimen with embedded steel mesh overcomes the disadvantage of brittle failure.(3)The surface layer-enhanced foamed ceramic plate can significantly improve the out-of-plane bearing capacity and stiffness after the foamed ceramic plate is compounded with the mortar surface.(4)The finite element and bearing capacity calculation model of the surfaceenhanced foamed ceramic board established is in line with the structural characteristics of the wallboard,and the calculation results are in good agreement with the test.(5)Based on the test and theoretical analysis,the structural measures of the surface layer-enhanced foamed ceramic plate are proposed,which are simple and applicable,and can be used in engineering practice. |
PDF Full Text Request