Hammer Beam Roof Structure

Not a true truss the construction is similar to corbeled masonry see corbel in that each set of beams steps upward and inward by resting on the ones below by means of curved braces and struts.

Hammer beam roof structure.

1 there is no hammer post on the hammer beam 16 17 as sometimes found in a type of arch brace truss 18 or. A false hammerbeam roof truss has two definitions. A true hammer beam truss like the one shown here relies on exterior buttresses reminiscent of the flying buttresses of notre dame cathedral to hold it in place and keep the roof planes from spreading apart. Hammer beam trusses can have a single hammerbeam or multiple hammerbeams.

The hammer beam bent is often associated with religious structures great halls or great rooms. The structure a hammer beam roof is analysed from the perspective of the king s carpenter hugh herland. This analysis is based on drawings made in 1913 to facilitate the repair of the roof and on the author s archaeological reconstruction of the carpentry based on those drawings. A hammer beam truss is a cathedral roof truss with an open center.

It uses reinforced posts curving slightly outward from the wall to support the weight. We usually use the hammer beam itself as a robust bending member as the hammer post vertical and brace into the post go into significant compression. Diagram of a hammerbeam roof hammerbeam roof systems developed in english architecture in the medieval period. Herland s experience at winchester in the early 1390s.

2 the hammer beam joins into the hammer post instead of the hammer post landing on the hammer beam. For any would be castle builder a great hall is probably on the wish list to be built as part of the structure and having a hammer beam type roof over the room is probably part of the design. I learned recently that these structures in an open timber roof are called hammer beam type roofs. Unless the structure has the ability to resist the outward thrust present at the bottom of the hb truss the modified hb truss is the way to go.

Modified hammer beam trusses can use a lower tie beam or steel rods to. A hammer beam timber frame bent pictured above is a beautiful and more complicated design and creates dramatic vaulted spaces. There are many ways to embellish this design from through tenons and radius cuts to decorative pendants or finials. Hammer beam roof english medieval timber roof system used when a long span was needed.