FEM-9_311_Englisch

Rules for the Design of Storage and Retrieval MachinesFEMStructures9.31102.1978(E)7861 '60 uon!pa puz1.Calculation2.1..Categories of main loads1.1'General2.1.1 DeadloadsThe calculations must be in compliance with acceptedrules of statics,dynamics,and theoretical mechanics.Deadloads are the forces due to the weight of all fixedand moving parts which are permanent operationalProvided that identical factors of safety are adhered to,components of the mechanical and electrical equipment,the calculations may also be based on the results of testsand of the proportionate share of the load supportingcarried out for determining the stresses which are pro-means such as-ropes but with the exception of the loadsduced in a structure under the assumed load conditions.listed in 2.1.2.The data concerning system,dimensions,and cross2.1.2 Lifted loadssections shown in calculations and drawings must be inagreement.Discrepancies are not permissible unlessThe lifted loads comprise the weight of the load unitthese have the effect of increasing beyond any doubtand the deadweight of assemblies receiving the load unitthe safety of all components.such as telescopic load fork and roller table,the dead-weight of the lifting carriage,and the proportionate1.2 Calculation methodshare of the weight of the load supporting means suchFor the loads assumed as explained in section 2,theas ropes,chains,etc.-three possible causes of failure are taken into accountas follows:2.1.3 Effects of vertical forces of inertiaA -Overstraining of materials.beyond the elastic limitThe effects of vertical forces of innertia produced whenB-Overstraining of structures beyond the criticalmoving the lifting carriage and the loads listed in sectionsbuckling stresses2.1.1 and 2.1.2 are taken into account by applying.deadload coefficients"and,,lifted load coefficients"C-Overstraining of materials beyond the fatiguestrength2.1.3.1 Deadload coefficients1.3 Permissible stressesThe deadloads of S/R machines in motion(see section2.1.1)and the corresponding stress resultants or stressesDetails on the-permissible stresses concerning A,B,andshall be multiplied by a deadload coefficient selectedC above can be seen from the future FEM design rulesfrom table 1.for crane structures.Table 1Relevant national standards apply for the transitionperiod.Travel speed v in m/minDeadloadRunways1coefficient2 Assumed loadswith jointswithout jointsStructures are subjected to the following load categories:up to 63up to 1001.1above63to125above 100 to 2001.2main loads,additional loads andabove 125above 200.1.3special loads.In the case of live loads on a S/R machine running onMain loads:spring-loaded,plastic,etc.wheels =1.1 may be used for-Deadloadscalculation independent of the travel speed and the typelifted loads (lifting carriage deadweight and weight ofof runway.the load unit),Taking an S/R machine on steel rim travel wheels as an-horizontal forces of inertia produced by drive units,example:-statical stabilizing forces.a)Travel s