Escalator Truss Strength Stiffness Analysis And Research

Escalator truss is escalator and passenger load bearing structure, according to theprovisions of the national standard, under the load of each square meter5000N, thebending deformation of escalator truss should not exceed one over one thousand of thetruss span. In this premise, escalator manufacturer to reduce production costs, improve theproduct’s market competitiveness, always hope optimization of truss structures, reduce thematerial consumption of truss. This article analyzed the strength and stiffness of anescalator truss, aims to ensure that conforms to the national standard requirements, and putforward guidance in optimizing the structure of the truss.On the basis of introduced the escalator truss related terms, several basic parametersof the researched truss is given in this article, such as span, slope angle, intermediatesupport, upper and bottom level steps, etc. According to the design of truss, it determinedthe relative position to the primary point of truss components. In MSC. FEA software,fixed coordinate system, according the relative position to define points, according thearrangement of truss bar connection related points to generate representative line of bar.After finish one side truss structure modeling, the other side of the truss structure modelwas generated by the mirror. Again according to the truss design, generate beam and plateconnecting the left and right sides of the structure, etc., to build the geometric model oftruss. Then, by defining the geometric model component properties and material propertiesof line (components) and surface (plate, etc.), use IsoMesh divided line into BAR2unit,and use Paver divided surface into square unit, create the finite element analysis model oftruss.According to actual installation truss support angle steel of the upper and lower, setthe boundary conditions of analysis model. According to the weight of truss, the weight ofthe steps and the sidebar distribution components, passenger load, etc., determine the truss of several kinds of load conditions and the specific load values of different load cases. Bystudied of finite element analysis, it researched the stress and deformation condition of thetruss under different load cases. The research results show that, deformation of truss in linewith the national standard, the truss girder has local stress exception, require localstrengthening.On the basis of the finite element analysis of truss above, it has made the bucklingchecking of compression bar, and has made the intensity checking of split hole, reducematerial components and the main welds etc. For supporting angle steel of the entireescalator carry on the bearing capacity checking. The results show that the compression barwill not buckling instability, and the strength of welding and angle steel has enoughbearing capacity, etc.According to the national standard GB16899-2011escalators and moving sidewalksmanufacturing and installation safety regulations, escalator truss must be provided thestatic stress analysis of data before enabling, so the research work of this paper is theessential condition that the escalator is enabled, in addition, the results will help escalatormanufactures to improving and optimizing truss structure.