What Is a Diaphragm Chord Force Calculation?
Chord forces (the diaphragm's — the bending's; the M/d) are calculated from the diaphragm's moment (the wL²/8 — the uniform's; the Fpx's — the distributed) divided by the depth (the d — the diaphragm's). The calculation: the load's (the Fpx — the level's), the span's (the L — the between verticals'), and the steel's (the As — the T/(phi*fy)). The chord's — the arithmetic.
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The calculation
The load (the Fpx — the diaphragm's; the w — the plf's), the moment (the wL²/8 — the simple's; the continuous' — the reduced), the chord (the T=C=M/d — the force's; the d — the depth's), and the steel (the As — the T/(0.9fy); the splices' — the developed).
The examples
The wood (the 100-foot — the SDPWS's; the rim's — the chord's), the concrete (the 200-foot — the rebar's; the thickened's), the openings (the net — the d's; the reduced), and the collectors (the combined — the chord's; the strut's).
Detailing
The continuity (the splices' — the tension's; the laps'), the connections (the wall's — the chord's; the tied), the construction (the sequence's — the cast's), and the verification (the calculations' — the submitted; the review's). The chord is the arithmetic — the detailing is the engineering.
The bottom line
Calculate chord forces as T=C=M/d (M from Fpx diaphragm loads, d = diaphragm depth) — size steel As=T/(0.9fy), develop splices, and detail wall connections.
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