A mathematical programming method to optimize the distribution field of a truss-like ma-
terial is presented. The densities and angles of members are optimized in two separate
procedures in each iteration. An explicit sub-problem in a variable separation form is es-
tablished at every iteration procedure. At each sub-problem, the stress constraint function
is expanded into a trigonometric series of the member angles. According to the extreme
condition, the optimal orientations of members are determined. The member densities are
optimized using the method of moving asymptotes (MMA). Two examples demonstrate that
the optimal truss-like structures are very close to analytic solutions.
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