Static structures (e.g. – buildings) – Composite prefabricated panel including adjunctive means – Having separate attached – elongated edging or stiffener
Patent
1997-10-27
2000-06-13
Aubrey, Beth A.
Static structures (e.g., buildings)
Composite prefabricated panel including adjunctive means
Having separate attached, elongated edging or stiffener
114 79R, 527291, 527292, E04C 232
Patent
active
060734205
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The invention relates to a web frame in the form of a plate with a flange welded in place along one side edge thereof. The invention also relates to a profile body intended to be welded at right angles onto on a web-forming plate as a flange projecting symmetrically or asymmetrically from both sides of the plate.
The invention has been developed in connection with the design and construction of fair-sized ships, but the new web frame and profile body according to the invention could, of course, also be used to advantage in other installations where there is a need for the use of frames or frame-like braces.
As ship dimensions have increased, the shipbuilding industry has seen a development of frames, including longitudinal frames, transverse frames and other similar braces, from rolled profiles to welded profiles. The last-mentioned profiles are supplied and used in the form of plates onto which flanges are welded along one side edge thereof, as is known from the typical T profiles or frames.
The flange terminations on the web frame are important with a view to obtaining the desired satisfactory strength for the web frame and the structure in general wherever the web frame is used. In addition to the requirement of sufficient strength, it is also a major factor that large, strong flanges increase the weight of the structure and also have a surprising, but considerable influence on the surface of the steel. The surface area in a structure, primarily a ship, is of great significance in terms of sheer costs because it involves surfaces which have to be treated with a view to corrosion protection. Moreover, today's usual welded web frames do not have an especially favourable structural design from a surface treatment point of view, primarily because in this case the web frames have rather inaccessible 90.degree. internal corners, and also sharp external corners.
SE 9301013 makes known a web frame having a bulb-shaped flange welded onto the end face of a plate. The bulb projects from one of the sides of the plate only, thereby giving the web frame an L shape. This shape has not proven to be particularly favourable. It is very vulnerable to fatigue. The stress concentration factor (K) for an L profile of this kind will be about 2.5. In order to compensate for this, the dimensions, and hence the weight, must be increased. In the case of a traditional T-shaped web frame where both the web and the flange consist of flat bar steel, K will be about 1.5.
However, a flat bar steel web frame of this kind has poor properties with respect to corrosion resistance and accessibility for surface treatment as mentioned above.
It is an objective of the invention to provide web frames and profile bodies which will yield advantages with respect to weight/strength ratio, and especially with respect to paint area/strength ratio. The term paint is used here to mean any kind of surface treatment whose objective is to provide protection against corrosion.
According to the invention, it has been found that relatively large savings can be made with the special design of the web frame flange, the aim of which is to optimise conditions with respect to weight and paint area. According to the invention, it has been found surprisingly that the aim of the invention can be reached by shaping the flange as a bulb body projecting symmetrically or asymmetrically relative to the mid-plane of the plate on both sides thereof, and that the bulb body in cross-section has inclined sides projecting at an obtuse angle (.alpha.) of 100.degree. to 120.degree. which, via a respective edge side having rounded corners and formed parallel to the plate, passes into a common side extending at right angles to the web frame.
The term bulb or bulb body is used here to mean a thickened, rounded profile body, which is distinct from the usual flat and straight-edged flange embodiment, where the actual flange is in reality a plate member which is welded at right angles onto the plate in order to form a web frame. With this design it is possibl
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Bj.o slashed.ru .O slashed.rjan
Jandinger Rune
vringmo Gunnar
Aubrey Beth A.
Fundia Profiler A/S
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