The new edition of this bestseller presents a unified approach to the variational and computational mechanics of solids and structures. It covers the fundamentals of the theory of elasticity and variational theorems, along with generalized variational theorems and applications. The authors present matrix structural mechanics, finite elements, weighted residuals, finite differences, and boundary element methods in a rational, unified manner. This edition includes a new treatment of stability theory, a catalog of operator solid mechanics matrices, and a one-dimensional introduction to the finite element method. The authors have also included more examples and homework problems.