Tension Chord Bracing-Short Discussion Requested
Tension Chord Bracing-Short Discussion Requested
(OP)
Pals
Fisher published a great article about this in one of AISC technical papers. I follow Fisher's advice whenever I design and detail a truss. I always provide lateral support at convenient locations to brace the bottom(tension) chord
Question is, do you know a different way beside physically bracing the chord?
There are cases I can not provide these braces, and I end up using heavy sections to limit overall slenderness to 300(lateral).
I have noticed however that guys who do cable kind of trusses never bother to brace their cables at all. Apparently it is difficult to detail the connection unless the cable system forms a grid, and aesthetically a grid becomes dense and too distracting. The easiest example I can give is the roof structure for the New Berlin Train Station(just type berlin Train Station or "Berlin + Hauptbahnhof" on your search engine,see also CE Magazine August 2006). I have seen many more of the kind
Your opinion requested.
Respects
IJR
Fisher published a great article about this in one of AISC technical papers. I follow Fisher's advice whenever I design and detail a truss. I always provide lateral support at convenient locations to brace the bottom(tension) chord
Question is, do you know a different way beside physically bracing the chord?
There are cases I can not provide these braces, and I end up using heavy sections to limit overall slenderness to 300(lateral).
I have noticed however that guys who do cable kind of trusses never bother to brace their cables at all. Apparently it is difficult to detail the connection unless the cable system forms a grid, and aesthetically a grid becomes dense and too distracting. The easiest example I can give is the roof structure for the New Berlin Train Station(just type berlin Train Station or "Berlin + Hauptbahnhof" on your search engine,see also CE Magazine August 2006). I have seen many more of the kind
Your opinion requested.
Respects
IJR






RE: Tension Chord Bracing-Short Discussion Requested
RE: Tension Chord Bracing-Short Discussion Requested
RE: Tension Chord Bracing-Short Discussion Requested
What I actually meant is bracing the web members at their ends, and that means where they meet the tension member, cable or not.
respects
IJR
RE: Tension Chord Bracing-Short Discussion Requested
His advice: IF IN DOUBT DON'T.
However, there is a major difference between the bottom chord of a heavy timber truss and a steel truss. The wood truss uses a solid section and the steel truss often uses wide flange beams.
RE: Tension Chord Bracing-Short Discussion Requested
RE: Tension Chord Bracing-Short Discussion Requested
How can you have rotational stiffness in a truss, usually very deep and web members pin-ended?
Do you want to elaborate?
Respects
ijr
RE: Tension Chord Bracing-Short Discussion Requested
RE: Tension Chord Bracing-Short Discussion Requested
Regards
CLEF