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The Railroad and Highway Bridge Across the Little Belt
AT the point of crossing, the little Belt (see map, Figure 1) is 2,700 ft. wide, the depth of water being 65 ft. near the shore and 130 ft. at mid-channel. The sea bed is a blue-green clay of extraordinarily dense and homogeneous composition; the deeper deposits are absolutely watertight and free from stone, which proved an important factor in the success of the foundation method adopted.
Professor Anker Engelund
Although at first sight the design of a concrete road slab may appear to be one of the simplest of engineering problems, it is, in fact, extremely difficult and complex. Even after many years' research both in this country and abroad there is still insufficient information available to enable the design to proceed in the usual manner for engineering structures, namely, on the basis of an adequate knowledge of the maximum stresses to which the road slab will be subjected. Important factors in the problem are the loads imposed by traffic, temperature and moisture changes, and the
supporting conditions supplied by the subgrade and the adjoining slabs.
THE test was carried out on the portal frame girders for Kidlington Canal Bridge, Oxfordshire, by the staff of the Building Research Station, Garston, on behalf of the
Oxfordshire County Council. It took place at the Chepstow Works of the Fairfield Shipbuilding and Engineering Company, Limited, the makers of the girders. The object was to find out how far the thrust, stresses and deflections observed agreed with those calculated in the course of design. It is believed to have been the first test of its kind carried out.
J.J. Leeming and S.C. Redshaw