Exercise system for determining the stresses in the lattice bars from the nodes method

Abstract

The purpose of the exercise system for determining the stresses in the lattice bars from the knot method is that the lattice loading is performed at the nodes. In design theory, the bars of a single trellis are subjected only to normal stresses (traction or compression), these bars being straight members that are undeform able, joined at their end by us (joints) considered to be perfect. These elements are very thin and can withstand little lateral loading, therefore, the loads must be applied preferably in the various nodes and not in the straight elements, leaving the structural elements that constitute them required only by normal efforts. If there is a need to apply a load between two nodes or when it is necessary to apply a distributed load on a truss, it is necessary to provide a load transfer system for the truss knots. This method consists of successively isolating each of the nodes, marking the active and reactive outer forces, and the normal stresses of the bars competing therewith. The normal stresses of the bars will thus be determined as forces that guarantee the equilibrium of the node. If the trellis is in balance, all your nodes are.