PARTICULAR REQUIREMENTS OF A LENGTH OF URBAN ELEVATED ROADWAY ARE DESCRIBED, WHICH HAVE BEEN SATISFIED BY THE USE OF A BRIDGE DECK USING 'TOP-HAT' SECTION BOX BEAMS WITH NO TRANSVERSE DIAPHRAGMS. THE DECK HAS PROVED ECONOMICAL AND SUITABLE FOR A WIDE RANGE OF BRIDGES. DURING THE DEVELOPMENT OF THE DESIGN OF THE DECK, METHODS OF ANALYSIS FOR THE EFFECT OF CONCENTRATED LOADS HAVE BEEN INVESTIGATED AND THE PAPER DESCRIBES AN APPROACH BASED ON FINITE ELEMENT TECHNIQUES AND THE DERIVATION FROM THIS OF A SIMPLER TECHNIQUE FOR DESIGN OFFICE USE, BOTH OF WHICH PROVIDE SATISFACTORILY ACCURATE RESULTS. /AUTHOR/

Load distribution characteristics of cellular structures are greatly influenced by transverse cell distortion and because of this these structures require a somewhat different analysis than those u...

Western avenue extension-precast concrete box beams in cellular bridge decks

The state of the art in analysis of cellular and voided slab bridges

This work is concerned with both static and dynamic behaviour of elastic plate systems. It is restricted to a particular, but important, class of structure made up of a series of thin, flat rectangular plates connected together along their longitudinal edges, and simply supported along their ends. The study is subdivided into three parts dealing, respectively, with the following aspects of the topic: (i) theoretical static analysis; (ii) theoretical dynamic analysis; (iii) experimental dynamic identification. For the static analysis of plate systems, of open or closed cross-section, a number of procedures are developed as extensions of the matrix progression technique. The proposed methods are exact in the sense that they are derived from elasticity theory and are highly efficient, especially for cross-sections of simple-chain configuration. They are more versatile than previous elasticity methods for plate systems in that they are applicable to orthotropic as well as isotropic plates, carrying distributed as well as concentrated loadings. . A new composite formulation is then presented for the free vibration analysis of plate systems. In this method an exact static stiffness matrix for orthotropic plates is used in conjunction with a consistent mass matrix adapted from finite strip theory, to give a linear eigenvalue problem which may be solved by standard routines. Special attention is directed to flexural vibration in the presence of in-plane forces, and to the vibration of systems with attached concentrated masses. The effect on accuracy of dynamic condensation techniques is also investigated. In the experimental study a statistical procedure, utilising pseudo-random test signals and cross-correlation analysis, is applied

The analysis and dynamic identification of plate systems

Tension stiffening in reinforced concrete hollow core slabs

A finite strip analysis of sandwich wood panels is presented. The panels consist of upper and lower plates stiffened by beams (joists) in one direction only. The analysis considers a Fourier series expansion in the stiffeners' direction and a polynomial finite element approximation i n the direction normal to the stiffeners. The number of degrees of freedom is 34, which includes also the lateral and torsional deformation of the joists. This permits consideration of the effect of joist bridging on the maximum deflection and bending stresses. A maximum of 20 joists per panel can be analysed. The modulus of elasticity(E) of the joists may be selected randomly from a distribution, and controlled to be within a given range. The upper and lower plates may possess orthotropic properties. Nails connect the plates to the joists. Nai l ing may be considered either as a continuous or as discrete connectors. The loading may be in the form of an uniformly distributed load spread over the entire panel or over a maximum of 20 smaller (concentrated) areas of the top plate. Numerical investigations have been carried out to verify the program. Parametric studies have been done to understand the behavior of the model. Lastly, the formula for shear lag given by C S A Standard CAN3-086.1-M84 is checked against the shear lag obtained from the current computer program.

Western avenue extension-precast concrete box beams in cellular bridge decks

Citations

The state of the art in analysis of cellular and voided slab bridges

The analysis and dynamic identification of plate systems

Tension stiffening in reinforced concrete hollow core slabs

Finite strip analysis of sandwich panels

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