Лако-красочные материалы — производство

The feasibility of using adhesives, in combination with bolts, to bond common structural details on highway bridges has been examined carefully by Albrecht et al.(16-18). The motives behind their work were to (a) increase the fatigue strength of steel bridge members, (b) reduce the connection size without lowering the fatigue strength, and (c) eliminate welded […]

Plate structures which have been stiffened by the addition of welded attachments can suffer from the problems of distortion and inferior fatigue performance outlined. The use of adhesive to unite the stiffener and the plate has been the subject of considerable research interest, and shows much promise. Harvey and Vardy(14) reported on an investigation into […]

The potential for adhesive bonding as a substitute for welding (or bolting) of steel structures is very large. In the short term, bonding Fig. 8.9. Compound bonded aluminium 1-beam comprising 15 individual extrusions (courtesy British Alcan Aluminium). techniques may prove to be particularly useful when an existing structure requires to be either stiffened or strengthened. […]

As with aluminium extrusions, so with pultruded fibre reinforced composite profiles. The limit to the size and complexity of these profiles suggests that a modular approach could be adopted towards forming alternative structural configurations from the basic or standard profile shapes by bonding together individual lengths. Composite materials lend themselves to being joined with resin […]

There is a technical and economic limit to the size and complexity of shape of a single aluminium extrusion. This limits their structural possibilities unless groups of extrusions can be joined together to produce large or intricate multi-chamber hollow combinations. By joining such groups together using adhesive bonding, as opposed to welding, there is greater […]

Useful mono-material structural elements may be formed by bonding together a number of individual pieces of the same material. Glued laminated timber (glulam) members as described in Chapter 7 represent a development in which structural elements of large cross — section may be created. Adhesive bonding, as opposed to mechanical fastening, leads to reduced stress […]

There exists great potential for the development of ‘macro composite’ assemblies for use as structural elements or members, in which adhesives could provide the stress transfer mechanism between the different constituent materials. Examples might include decking elements or roof members comprising steel and timber, for example. An interesting structural possibility has been investigated by Oxford […]

Steel/concrete Adhesives may be used to bond precast concrete slab units directly to the flanges of longitudinal steel girders in bridge construction. Such a technique has been successfully employed in Germany(12). On one bridge described in Chapter 7, epoxy resins were used in a variety of forms and locations on the superstructure. The successful use […]

The possibilities for making bonded structural sandwich elements in a variety of materials are very real. However, whilst there exist structural examples such as aluminium honeycomb panels (used in aircraft and transport applications) and metal skinned foam sandwich panels (used as the monocoque chassis in refrigerated transport applications), these composite constructions are normally utilised in […]

Structural design. The comments which follow are applicable to the case of open sandwich slab elements of either constant depth or inverted catenary section acting compositely with steel plate girders, in accordance with BS 5400 (4). For constant depth elements an initial design approach may be to assume that the deck behaves as a series […]