Based on quadrilateral finite element principle, calculation of truss system under the action of external force, the displacement of each node and element strain. Main program BLOCKMAT. J m, read from input file node number, cell number, number of nodal load, a constrained boundary points, elastic modulus, poisson s ratio, thickness and unit defined array, node coordinate arrays, nodal force array, array constraints information. Input file inport. TXT different parameters represent different truss structure.

四边形单元
..........\ASSEMBLE.m
..........\BLOCKMAT.m
..........\INNERSTRESS.m
..........\READIN.m
..........\STRESSMATX.m
..........\VECLOAD.m
..........\inport.txt
..........\output.txt

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