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THE INCLUSION OF FLEXIBLE JOINTS IN THE STIFFNESS METHOD

A Al-Hammoud, P W Sharman

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Abstract

The joint area between beam type elements may be regarded as a sub-structure, the behaviour of which may be defined by the stiffness or flexibility matrix. The flexibility of such a sub-structure may be determined experimentally by the measurement of displacements under a variety of loading conditions, and the report describes the method of obtaining the stiffness matrix from this data. Alternatively, the joint area may be analysed by a detailed finite element calculation and the report describes two methods of obtaining the stiffness matrix, one using applied forces, the other by prescribing displacements. The method of inputting the derived stiffness matrix into the PAFEC 75 finite element program is fully described with examples. (Author/TRRL)

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What this paper is about

The joint area between beam type elements may be regarded as a sub-structure, the behaviour of which may be defined by the stiffness or flexibility matrix. The flexibility of such a sub-structure may be determined experimentally by the measurement of displacements under a variety of loading conditions, and the report describes the method of obtaining the stiffness matrix from this data. Alternatively, the joint area may be analysed by a detailed finite element calculation and the report describes two methods of obtaining the stiffness matrix, one using applied forces, the other by prescribing displacements. The method of inputting the derived stiffness matrix into the PAFEC 75 finite element program is fully described with examples. (Author/TRRL)

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Available abstract

The joint area between beam type elements may be regarded as a sub-structure, the behaviour of which may be defined by the stiffness or flexibility matrix. The flexibility of such a sub-structure may be determined experimentally by the measurement of displacements under a variety of loading conditions, and the report describes the method of obtaining the stiffness matrix from this data. Alternatively, the joint area may be analysed by a detailed finite element calculation and the report describes two methods of obtaining the stiffness matrix, one using applied forces, the other by prescribing displacements. The method of inputting the derived stiffness matrix into the PAFEC 75 finite element program is fully described with examples. (Author/TRRL)

Key concepts: Direct stiffness method, Stiffness, Structural engineering, Finite element method, Stiffness matrix, Flexibility method, Flexibility (engineering), Matrix (chemical analysis)

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