Bashar Seraphim's Activities

MSTower

Charles Ononye — Sun, 14 Apr 2019 21:18:40 GMT

I am trying to create RF panel for tower loading. I am finding it quite difficult to do. I can load the Dishes but I can't find the RF panels in the Ms_anc.lib can any one assist me in getting a comprehensive ancillary library file or teach me how to create one?

Curve Selection for Effective slenderness factor (K) in Mstower

Bashar Seraphim — Thu, 06 Apr 2023 15:35:57 GMT

Hello

I'm a bit confused about the way MsTower depends to determine buckling curve to calculate effective slenderness factor (K) according to TIA-222-G table 4-4

According to Mstower manual P56 " If the number of bolts is not specified MStower will assume that all members are single-bolted except for legs, face bracing, and horizontals that are assumed to have two or more bolts"

In attached summary file there are X Bracing listed with number of bolts nb=2 bu the selected curve is No.4 which correspond with the case of "both ends are unrestrained"( one bolt )

May I get clarification about the calculation logic please

Thanks

Bashar

communities.bentley.com/.../example_5F00_1.rar communities.bentley.com/.../example1.rar

Mstower XH1 discontinuous bracing

Bashar Seraphim — Tue, 21 Mar 2023 09:54:14 GMT

Hello,

I have modeled a tower 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

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