This paper is concerned with the approach to implementing the Penalty function method for imposing multi-freedom constraints in geometrically nonlinear analysis of imperfect trusses based on mixed finite element formulation. Using a finite element model based on displacement formulation. it is required to incorporate both the dependent boundary relations and initial length imperfectio... https://www.spidertattooz.com/Muumi-lyhty-kulho-metsassa-8cm/