Recent British Advances in Yield Line Analysis by the Equilibrium Method


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Title: Recent British Advances in Yield Line Analysis by the Equilibrium Method

Author(s): Leonard L. Jones

Publication: Special Publication

Volume: 12


Appears on pages(s): 295-318


Date: 1/1/1965

With discussion by Manuel Xanthakis and Leonard L. Jones. This paper reports certain aspects of the work carried out on yield line analysis at four research centres in Great Britain. Conditions governing the upper bound moment distribution along the yield lines are established and from these nodal force values are obtained. The values obtained agree with those given by Johansen but new restrictive rules are revealed. These rules allow the known anomalies in the equilibrium method for patterns with straight line characteristics to be resolved. By direct appeal to the work method it has also been possible to establish new governing rules for nodal forces at yield line junctions which have moments specified in more than three independent directions. Nodal force values which should be inserted at reinforcement discontinuities are also obtained. These new developments are applied to several specific problems in order to demonstrate their use.