USFOS USER S MANUAL 6 1 1 Input Description USFOS Control Parameters Table of Contents 6G UNpUt DEseriptrOMmssc isScciieleseissaceccssscasnsdstacdectbalaavsths stacesbnes cedbataaagesua a a as NSSS 6 1 1 6 1 General information y reeet ena ed e aE fat Seca eee as sae aaa gee eas aa 6 1 1 6 2 Formale a T A svi enaey AEA ENTE AT eee ates 6 2 1 6 2 1 Comments rne e Ee pE ETA tran aL Ea adel 6 2 1 6 3 Userinputdescritlon e enie e e E E e ia E A eie 6 3 1 6 3 1 General
USFOS USER S MANUAL 7 1 Running USFOS 7 RUNNING USFOS 7 1 ANALYSIS SPECIFICATION The aim of this section is to give some simple rules of thumb in the use of USFOS These points are mainly based on experience from analyses of offshore jacket structures but the basic considerations should be applicable to other areas as well 7 1 1 Pushover Analyses In nonlinear analyses the accuracy of the results depends on the size of the load steps The load steps may be large
USFOS USER S MANUAL 4 1 Solution Strategy 4 SOLUTION STRATEGY The USFOS nonlinear analysis follows the following basic procedure e The load is applied in steps e The nodal coordinates are updated after each load step e The structure stiffness is assembled at each load step The element stiffnesses are then calculated from the updated geometry e At every load step each element is checked to see whether the forces exceed the plastic capacity of the cross section I