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Guard Rail at Stairs <br />Height of Guardrail h = 42 in <br />Load on Guardrails P = 200 lbs <br />Moment Arm between Tension Screw Plate Edge dm = 11.25 in <br />Number of Tension Strap n = 2 <br />Tension per Strap Ts = h * P / (dm * n)= 373 lbs <br />Capacity of CS20 Strap Tn = 1030 lbs <br />Demand Capacity Ratio DCR = Ts / Tn = 0.36 < 1 OK <br />Alternative Post <br />Moment Arm between Tension Screw Plate Edge dm = 3.5 in <br />Number of Tension Strap n = 2 <br />Tension per Strap Ts = h * P / (dm * n)= 1200 lbs <br />Capacity of CS16 Strap Tn = 1705 lbs <br />Demand Capacity Ratio DCR = Ts / Tn = 0.70 < 1 OK <br />Post at Stringer <br />Moment Arm between Tension Screw Plate Edge dm = 7.5 in <br />Number of Tension Strap n = 2 <br />Tension per Screw Ts = h * P / (dm * n)= 560 lbs <br />Withdrawal Capacity W = 225 lbs/in <br />Embedment Length lem = 3.5 in <br />Capacity of 1/4" Lag Screw Tn = W * lem = 788 lbs/in <br />Demand Capacity Ratio DCR = Ts / Tn = 0.71 < 1 OK <br />35