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DESIGN CALCULATION FOR: Overhead Yard Pipework: PH-1, CSC : ISMB400 622.1 ISMB300

This document summarizes the design calculations for overhead pipework at a steel plant. It shows the original and new proposed designs for pipe bridges, including the bridge girder section used, maximum stress ratios, predicted deflection levels, and deflection slopes. The new proposed designs resulted in higher predicted deflections above acceptable limits in some cases, so further trial designs were attempted to reduce deflections to an acceptable level.

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47 views3 pages

DESIGN CALCULATION FOR: Overhead Yard Pipework: PH-1, CSC : ISMB400 622.1 ISMB300

This document summarizes the design calculations for overhead pipework at a steel plant. It shows the original and new proposed designs for pipe bridges, including the bridge girder section used, maximum stress ratios, predicted deflection levels, and deflection slopes. The new proposed designs resulted in higher predicted deflections above acceptable limits in some cases, so further trial designs were attempted to reduce deflections to an acceptable level.

Uploaded by

sujit5584
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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DESIGN CALCULATION FOR : Overhead Yard Pipework: PH-1,CSC; Prepd. By: B.

Jha
BARAH ASH POND, TATA BLUESCOPE STEEL LTD. Date: 13-03-09

As designed earlier New

Bridge Section Maximum deflection/ Section


STAAD file Girder Previously Maximum deflection span i.e pipe Previously
name Span used stress ratio of girder slope Remarks used
(m) (cm)
0.683 for top
TBSL PIPE chord angle / deflection
RK 33-42 13.5 ISMB400 0.35 for 2.17 622.1 < L/ 500; ISMB300
13.5M girder Safe

2/ 185x10 L/ 500 <


TBSL PIPE 0.791 for top
th. Flg. deflection
RK 33-42 16 8 th. Web
chord angle / 4.47 357.9 ISMB350
16M 0.522 for girder < L/ 325;
400 deep may go

2/ 185x10 L/ 500 <


TBSL PIPE 0.726 for top
th. Flg. deflection
RK 33-42 17.5 8 th. Web
chord angle / 4.26 410.8 ISMB400
17.5M 0.479 for girder < L/ 325;
500 deep may go

2/ 185x10 L/ 500 <


TBSL PIPE 0.732 for top
th. Flg. deflection
RK 42-44 14.5 8 th. Web
chord angle / 3.3 439.4 ISMB400
14.5M 0.513 for girder < L/ 325;
500 deep may go

NOTE: Deflection values shown in above table is deflection of girder. Maximum deflection of pipes on cantilev
Prepd. By: B.Jha
Date: 13-03-09

New trial-1 New trial-2

Maximum deflection/ Section Maximum Maximum deflection/


Maximum deflection span i.e Previously stress deflection span i.e
stress ratio of girder pipe slope Remarks used ratio of girder pipe slope
(cm) (cm)
1.11 for top
chord angle / stress ratio high;
0.58 for 4.47 302.0 deflection > L/
girder 325; not OK

0.942 for top 0.745 for


chord angle / deflection > L/ top chord
6 266.7 ISMB400 angle / 4.3 372.1
0.59 for 325; not OK
girder 0.459 for
girder

0.98 for top 0.752 for


ISMB400 top chord
chord angle / deflection > L/
6.08 287.8 +2/flg.Pl. angle / 4.49 389.8
0.54 for 325; not OK
100x8 th. 0.402 for
girder
girder

0.984 for top 0.678 for


ISMB400 top chord
chord angle / deflection > L/
4.58 316.6 +2/flg.Pl. angle / 3.07 472.3
0.596 for 325; not OK
100x8 th. 0.402 for
girder
girder

m deflection of pipes on cantilever part will be still higher.


2

Remarks

L/ 500 <
deflection
< L/
325;
may go
L/ 500 <
deflection
< L/
325;
may go
L/ 500 <
deflection
< L/
325;
may go

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