TABLE OF CONTENTS
1. LIST OF TABLES...…………………………………………………………………………….……1 2. SECTION A : EQUIPMENT DESCRIPTION ........................................................................... 2 3. SECTION B : PROCEDURE ....................................................................................................... 2 4. SECTION C : SUMMARY OF SAFETY FACTOR CALCULATION ....................................... 3 5. APPENDIX 1 : LOAD DETERMINATION ................................................................................ 4 6. APPENDIX 2 : MATERIAL PROPERTIE……………………………………………………...…5 7. APPENDIX 3 : STATIC LOAD SAFETY FACTOR CALCULATION…………………………………………………………………………………….5 8. 3.1 SPREADEBAR…………………………………………………….…………………………….5 9. 3.1.1 TENSILE STRESS DUE TO BENDING MOMENT……………………………………….6 10. 3.1.2 SHEARING STRESS………………………………………………………………………….6 11. 3.1.3 BENDING STRESS IN CENTER SUPPORTING HOLE …………………………………7 12. 3.1.4 "TEAR - OUT" SHEAR STRESS …………………………………………………………...7 13. 3.1.5 AISC 1.16.5….....................................................................................................................7 14. 3.1.6 AISC 1.16.5.2…………………………………………………………………………………..8 15. 3.1.7 CRITICAL BUCKLING LOAD .......................................................................................... 8 16. 3.2 LIFTING LUG ...................................................................................................................... 10 17. 3.2.1 CALCULATIONS……………………………………………………………………………16 18. APPENDIX 4 : SEISMIC LOAD SAFETY FACTOR CALCULATION……………………...39 19. APPENDIX 5: SLING LENGHTS AND LOADINGS………………………………………….40 20. APPENDIX 6: WELD SIZE CALCULATIONS…………………………………………………41 21. APPENDIX 7: SECTION PROPERTIES………………………………………………………..42 22. REFERENCES …………………………………………………………………………………….43
NESMA HAVATEK 1
Project Name: Lifting Beam
43
LIST OF TABLES AND FIGURES
23. PROPERTIES OF SECTION AISC ..............................................................................................
24. FIGURES OF LIFTING LUG.OF BEAM .....................................................................................
25. FIGURES OF BEAM DRAWING .................................................................................................
26. FIGURES OF BM & SF DIAGRAM ..............................................................................................
27. SLING LENGTH AND LOADING ................................................................................................
28. SAFE LOAD TABLES ...................................................................................................................
29. MIT BEAM CALCULATION .......................................................................................................
NESMA HAVATEK 1
Project Name: Lifting Beam
43
SECTION A : EQUIPMENT DESCRIPTION THE SEPREADER BAR ASSEMPLY CONSISTS OF A SPREADER BAR OF IPN 320. THE OTHER CRITICAL COMPONENETS OF THE ASSEMPLY ARE THE SLINGS ATTACHED TO THE SPREADER BAR TO THE LIFTING MECHANISM AND THE LUGS WHICH ARE USED TO LIFT THE BEAM. SECTION B : PROCEDURE CALCULATE THE WEIGHT OF THE BEAM ASSEMBLY INCLUDING LUGS , SHACKLES , SLINGS , AND CHOKERS . COMPARE THE ACTUAL WEIGHT WITH THE ASSUMED WEIGHT AND ADJUST FORCES, IF REQUIRED. IF IT IS NECESSARY TO DETERMINE THE CAPACITY OF AN EXISTING LIFTING BEAM OF UNKNOWN POTENTIAL, AN ANALYSIS CAN BE MADE USING THE FOLLOWING PROCEDURE : 1. MEASURE THE BEAMS , LUGS , LUG LOCATIONS , PIN HOLE DIAMETER AND LOCATION, AND WELD SIZE AND EXTENT. 2. ESTABLISH THE BEAM PROPERTIES AND TYPE OF STEEL. 3. IDENTIFY THE CRITICAL GOVERNING GEOMETRIC CONDITIONS . 4. CALCULATE FORCE DIAGRAM. 5. CALCULATE SHEAR CAPACITY OF THE BEAM . 6. CALCULATE MOMENT CAPACITY OF THE BEAM. 7. CALCULATE LUG PLATE WELD CAPACITIES . 8. CALCULATE BEARING CAPACITY OF LUG PLATES . 9. CALCULATE TEAR -OUT CAPACITY OF LUG PLATES. 10. CALCULATE SHEAR CAPACITY OF LUG PLATES . 11. ESTABLISH MAXIMUM SHACKLE SIZE AND CAPACITY WHICH PIN HOLE DIAMETER AND LOCATION WILL ACCOMMODATE .
12. CALCULATE WEIGHT OF BEAM ASSEMBLY , INCLUDING SHACKLES , LINES, ETC. 13. SELECT THE ADDED FACTOR OF SAFETY , USUALLY ABOUT 1.8. 14. IDENTIFY THE GOVERNING LOAD FROM THE PREVIOUS CALCULATIONS AND APPLY THE FACTOR OF SAFETY. T HIS WILL PRODUCE A FACTORED LOAD CAPACITY. EXAMPLE: CALCULATED LOAD CAPACITY = 78453.2 N
NESMA HAVATEK 1
Project Name: Lifting Beam
43
F ACTOR OF SAFETY = 1.8 WEIGHT OF LIFTING BEAM , SHACKLES , AND LINES = 2 KIP
SECTION C : SUMMARY OF SAFETY FACTOR CALCULATION TABLE-1 LIST THE CALCULATED SAFETY FACTORS AND REQUIRED SAFETY FACTOR FOR THE STATIC-9 KILONEWTON DESIGN LOAD FOR THE DIFFERENT COMPONENTS OF THE LIFTING FIXTURE. THE CALCULATION USED TO ARRIVE AT THESE RESULT CAB BE FOUND IN APPENDIX 3. SECTION D : TESTING REQUIREMENTS THE SPREADER BAR SHALL BE LOAD TESTED TO 150% OF THE DESIGN LOAD ACCORDING TO LLNL’S M.E. DESIGN SAFETY STANDARDS.
NESMA HAVATEK 1
Project Name: Lifting Beam
43
SECTION E : REFERENCES -
MESN01-092-0A MARKS’STANDARD HANDBOOK FOR MECHANICAL ENGINEERS, 8TH EDITION, MCGRAWHILL, NEW YORK (1978) MANUAL OF STEEL CONSTRUCTION , 8 TH EDITION, AMERICAN INSTITUTE OF STEEL CONSTRUCTION, CHICAGO (1980) DESIGN SAFETY STANDARD – MECHANICL ENGINEERIGN, REV . 7/CHG. 3 LLNL (1995). WWW. THECROSBYGROUP .COM – 5 JULY 2001 MECHANICAL ENGINEERING DESIGN, 6TH EDITION, SHGLEY AND MISCHKE, MCGRAW-HILL, NEW YORK (2001).
