design of bracket.pdf

HEAT EXCHANGER SUPPORT BRACKET DESIGN CALCULATIONS

D-ZERO ENGINEERING NOTE # 3823. 11 5- EN-41 7 January 12, 1995 Russ Rucinski RD/DeJ Mech.

Revision 5/6/96: Added Independent review questions & answers Added finite element analysis Added HX top plate analysis

This engineering note documents the design of the heat exchanger support brackets. The heat exchanger is roughly 40 feet long, 22 inches in diameter and weighs 6750 pounds. It will be mounted on two identical support brackets that are anchored to a concrete wall. The design calculations were done for one bracket supporting the full weight of the heat exchanger, rounded up to 6800 pounds. The design follows the American Institute of Steel Construction (AISC) Manual of steel construction, Eighth edition. All calculated stresses and loads on welds were below allowables. See the Summary table on the next page. 5 I 16/96 Reyision:

The hand done analysis was independently reviewed by Bob Wands of RD/MSD and a memo with his questions and my answers are in Appendix B. As FEA exercise, I ran a element finite element analysis using beam elements. The information from this analysis is included as appendix C. All stresses found in the FEA were below allowables. Additional hand calculations (See Appendix D) for the top attachment plate were done after Bob Wands' review. At the time of fabrication the top plate thickness was increased from 1/4" to 3/8". The stresses for the 3/8" thick top plate were acceptable.

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MAX. CALCULATED STRESS OR LOAD

ALLOWABLE STRESS OR LOAD

Upper horiz. member {411 x 8" X 114" wall rect. tubing}

1.1 ksi, tensile 2.2 ksi, shear 9.6 ksi, bending

27 ksi, tensile 18.4 ksi, shear 30.4 ksi, bending

0.357

Vertical member, CASE II {4" x 8" x 114"wall rect. tubing}

1.2 ksi, compressive 2.0 ksi, shear 3.4 ksi, bending

27 ksi, tensile 18.4 kSi, shear 30.4 ksi, bending

0.155

Vertical member, CASE I {411 x 8" x 114" wall rect. tubing}

2.0 ksi, shear 8.7 ksi, bending

18.4 ksi, shear 30.4 ksi, bending

not applicable

Lower horiz. member {411 x 8" X 1/411 wall rect. tubing}

1.1 ksi, compressive 2.2 ksi, shear 9.6 ksi, bending

27 ksi, compressive 18.4 ksi, shear 30.4 ksi, bending

0.357

Wedge anchors, 1/2" dia. {Hilti Kwik bolt II}

1820 Ibs, tensile load 850 Ibs, shear load

2400 Ibs, tensile load 1960 Ibs, shear load

ftlFt"2 + fv/Fv"2 < 1.0 0.763

Fillet weld, top anchor plate {1/8" intermittent fillet weld}

993 Ibsllinear inch

1909 Ibsllinear inch

not applicable

Weld. upper horiz. to vert. member 1/411 fillet, 1/4" groove

4146 Ibs/linear inch

3818 Ibs/inch - 2 short sides 5250 Ibs/inch - 2 long sides

not applicable

Weld, vert. to lower horiz. member {1/8" groove weld}

2.4 ksi, compressive 10.8 ksi. bending

27 kSi, compressive 18.4 ksi. shear

0.676

Fillet weld. bottom anchor plate {1/8" intermittent fillet weld}

993 Ibs/linear inch

1909 Ibs/linear inch

not applicable

DESIGN ITEM

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Summary of Support bracKet design analysis

COMBINED fa/Fa + fb/Fb < 1.0

Russ Rucinski, RD/DO Mechanical

~RIAL-CATEGORY

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