Study On The Performance Of An Integrated Metal Roof Slab

Metal cladding system is a fabricated enclosure system which uses metal plate as panel,connected by supporting components,combined with thermal insulation,waterproof,steam insulation and other materials to meet the corresponding building functions.The typical metal roof system is divided into main purlin,secondary purlin,profiled steel sheet,lining purlin,support and roof panel according to the construction sequence.There are some problems in the construction and installation,such as lack of safe working face and difficult to guarantee the welding quality.The research object of this paper is a kind of integrated metal roof floor,which is made of thin steel plate by continuous rolling with a special mold.It can be used as a new load-bearing component in the metal roof system.Compared with the traditional metal roof system,the roof system with new integrated metal roof floor has obvious advantages in structural performance,construction and installation,building function and so on,and has considerable application prospects.However,there is no clear understanding about the failure mode,bearing capacity and design method of the integrated roof panel system.This paper intends to carry out systematic experimental and theoretical research on the above aspects,so as to provide theoretical basis for the reasonable design and reliable application of the product.In order to obtain the actual failure mode and bearing capacity of the integrated panel under different working conditions,full-scale bending test,special test of material properties and local strength and finite element simulation were carried out,and the applicability of the existing direct strength method formula to the integrated panel design was verified.The main research contents are as follows:(1)Experimental study on integrated metal roof slab Five types of full-scale bending tests were designed and carried out with 9 specimens,including temporary construction state and installation completion state,positive and negative bending moment of section,transverse single row and double row,single span simply supported and two span continuous.The initial geometric defects of each specimen were measured,the failure mode and ultimate bearing capacity of each specimen were observed and obtained,and the displacement and strain data of the control section during the whole loading process were obtained.The material properties of the specimen were tested in the plate area,corner area and web area.The web crippling test,hook strength test was designed and carried out,and the ultimate bearing capacity and the range of hook strength of web crippling lameness are obtained.(2)Numerical simulation and parameter analysisBased on ABAQUS,a refined finite element model of full-scale bending test component of integrated plate is established,which takes into account factors such as dual nonlinearity,boundary conditions and actual connection structure.The failure mode,ultimate bearing capacity and moment deflection curve obtained from the finite element analysis are compared with the test results to verify the accuracy and feasibility of the finite element modeling method.By changing the initial geometric defect amplitude,transverse row number and span of the specimen,the parameter analysis is carried out to explore its influence on the ultimate bearing capacity of the specimen,and to provide more abundant data for the verification of the design formula of the component.(3)Verification of practical design formula Based on the data of full-scale bending test and numerical simulation,the effectiveness of the design of the integrated plate is verified by using the formula of direct strength.