Research And Application Of Shear Performance Of Assembled Wall Laminates

In recent years,China has vigorously developed prefabricated buildings and promoted the development of green building materials.As a biological material,wood not only has light weight and good seismic performance,but also has excellent characteristics such as low energy consumption and recycling.With the improvement of science and technology,the mechanical properties of traditional natural wood are more superior after artificial processing.Earthquakes occur frequently in China.The application of artificial laminates can strengthen the safety of buildings and protect people ’s lives and property to a certain extent.The mechanical properties of artificial laminates depend largely on the production technology level of manufacturers.Due to the anisotropy of wood,the production technology of manufacturers is uneven.In view of this,in order to promote the development of prefabricated buildings and man-made laminates and respond to the goal of ’ double carbon ’,this paper mainly tests the shear performance of European pine board and plywood manufactured by different laminated board manufacturers in China,and provides data support for the preparation of the national standard ’ Sichuan Provincial Technical Standard for Prefabricated Lightweight Walls ’,and uses ANSYS finite element analysis software to carry out dynamic analysis on the wall cladding panel using laminated panels.Through the comparison of model results,the influence of laminated panels on the main structure of space under earthquake action is analyzed,which provides reference for practical engineering application.The research results of this paper are as follows :Experimental study on shear performance of common laminates.The ultimate bearing capacity,deformation capacity and shear modulus of the laminate under shear load were obtained,and the specimens were compared and analyzed by five variables : plate type,material,manufacturer,thickness and particle laying method.The test results show that the plywood is ductile failure,and its failure mode is mainly characterized by dislocation failure on the upper and lower short sides of the span and debonding separation of each bonded veneer.The European pine plate belongs to brittle failure,and the failure mode can be roughly divided into three types : in-plane oblique crack failure mode,in-plane vertical crack failure mode,and in-plane vertical crack and oblique crack cross failure mode.Domestic laminated plate shear bearing capacity calculation formula modeling.The main factor affecting the shear capacity of plywood is thickness;the main influencing factors of the shear capacity of the pine board are the thickness and the direction of the particle laying.Compared with the specimens with the longitudinal direction of the outer layer particle laying,the cross grained pine board specimens show better mechanical properties.The initial defects reduce the ultimate shear capacity of the plate.According to the polynomial fitting method,the simplified calculation formula of the shear ultimate bearing capacity of the European pine plates such as Huafeng,Baoyuan and Lejiajia with the change of thickness is derived,and the reliability of the formula is verified by the reliability index.Laminated plate foundation research and engineering application.The ply of common laminates and the shear principle in building structures are introduced and analyzed in detail.It is concluded that laminates should have appropriate shear strength and in-plane stiffness to help the main body of the structure dissipate energy and transfer force.The damage mode of laminates is studied,and the theoretical basis of composite mechanics is expounded.Finally,through an engineering example,the specific application of prefabricated laminated plates in actual buildings is discussed in detail,and its beneficial influence on the main structure is further explained.Study on the influence of laminated plates on the spatial main structure under dynamic load.The dynamic spectrum analysis and time history analysis of commercial buildings in high intensity areas are carried out by ANSYS finite element software.The difference of each index value between the two models under dynamic action is obtained by comparing the use of laminates as wall cladding panels and the absence of laminates.The results show that the arrangement of laminates can change the order of translation and torsion of the structure to a certain extent,but it has not caused substantial change to the structural system.The cladding panel can provide additional stiffness to the space main structure;under the action of horizontal earthquake,the laminated plate can effectively absorb part of the seismic energy and help the main structure to further consume energy.