Mstower discontinuous bracing strength calculation

[Bashar Seraphim]

Hello everyone,

I have modeled a tower using Mstower 6.20 with one panel configuration of XH1 and discontinuous X bracing (XDISC)

Upon reveiwing the detailed report, the results shows cross brace capacity being checked taking the tension in the other member into consideration and based on that the total length L=L1+L2 checked (paragraph below)

May I get some explanation why total length checked for the discontinuous braing case ?

Thanks in advance

Members: 1205 1206
Intersecting X brace: 1207 1208 at node: 1204
Braces not continuous
Section: 63X5EA Y fy: 355.0 fu: 480.0 Hot rolled
D B Tf Tw: 63.00 63.00 5.00 5.00
Ag An rx ry rv: 611.65 521.65 19.34 19.34 12.42
No. bolts: 1 BH: 18.00 L
Bolts: 1 M16-8 8.8 Ac: 201.0 fy: 620.0 fv: 496.0 fu: 827.0 No. shear planes: 1
Ply th: 5.00 fyp: 355.00 fup: 480.00 X: 0.00 Y: 0.00 Z: 0.00 Cap: 73.7

Total member length: 4120.8
Rotational stiffness ratios (restraint/member):
my: 0.0 0.0 0.0
mz: 0.0 0.0 0.0
Case: 3000
Axial force range: 0.1c 0.4c
Memb Curve L L/rx L/ry L/rv KL/r fy' Fcr íPnt íPnc
1205 b4 1982 102.5 102.5 159.5 159.5 355.0 68.0 140.8 37.4
1206 b4 2139 110.6 110.6 172.2 172.2 355.0 58.4 140.8 32.1
check cross brace capacities:
Pb1 Pb2 Pb L1 L2: 0.11c 0.36c 0.36c 1981.75 2139.03
Px1 Px2 Px : 0.01t 0.26c 0.26c
Tension/compr. in X brace < 0.2, L = L1 + L2 = 4120.8
1205 b4 4121 0.0 213.1 0.0 213.1 355.0 38.1 140.8 21.0