Nonlinear analysis of underconstrained structures

Underconstrained "kinematically indeterminate# assemblies of bars and pin!joints possess a speci_c kind of nonlinearity which appears even for small displacements and linear elasticity[ Various approaches to nonlinear analysis based on the Newton Raphson procedure are considered[ The subspace Newton Raph! son technique is proposed[ Theoretical considerations are accompanied by numerical examples of plane and space underconstrained assemblies