Author: Milner, M W;Bainbridge, R J
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Milner, M W;Bainbridge, R J
This paper presents an overview of the scope for the use of timber in bridges. The wide variety and global availability of timber as a construction resource is illustrated, together with case studies of a selection of bridges employing timber as the primary structural material. C.J. Mettem, R.J. Bainbridge and D.L. Jayanetti
Lateral-torsional buckling of beams Richard Harris, from Bournemouth, has examined the eflective length of compression flanges of - as he describes it - ‘(not so) simple beams’ and continues: This subject causes much confusion. If we, as a profession, cannot even agree on the design of simple beams, we do not deserve the respect from the public that so many of us apparently want. Unfortunately, the guidance on effective length in the various British Standards relating to structural steelwork elicits no uniform response from practitioners. I do not think thathis should be blamed on ‘engineering judgment’. There are two aspects, each of which is often treated differently by various designers: (i) does the compression flange have sufficient restraint to prevent lateral-torsional buckling? (ii) if not, what is the effective length of the flange? SCI publication Lateral Stability of Steel Beams and Columns, gives excellent guidance.
Robustness tests have been undertaken on a full-scale six-storey timber frame test building. The building, known as TF2000, is the result of a DETR-supported and industry-funded research project. The core research programme includes full-scale tests to enable an evaluation of the actual behaviour of the TF2000 structure when selected vertical loadbearing wall panels are removed. This evaluation was to verify by ‘test’ that the inherent stiffness of standard cellular platform timber frame construction can provide adequate robustness so that, in the event of an accident or misuse, the building will not suffer collapse to an extent disproportionate to the cause. This is referred to as disproportionate collapse compliance within the UK Building Regulations. M.W. Milner, S. Edwards, D.B. Turnbull and V. Enjily