ROOFTOP TOWER DESIGN A COMPUTER AIDED DESIGN PRESENTATION : ROOFTOP TOWER DESIGN A COMPUTER AIDED DESIGN PRESENTATION SHITTA , RAZAK OLASUNKANMI (00/30GB064) DEPARTMENT OF CIVIL ENGINEERING
UNIVERSITY OF ILORIN
JAN 2010
Slide 2 : SOFTWARE EMPLOYED.
MSTOWER: TOWER MODELLING AND ANALYSIS
STAAD Pro: MODELLING AND ANALYSIS OF THE SUPPORTING STRUCTURE
SCALE: REINFORCED CONCRETE DESIGN CHECK TO ASCERTAIN THE STRUCTURAL ADEQUACY OF THE SUPPORTING STRUCTURE.
Slide 3 : 3D MODEL OF THE UNILORIN SENATE BUILDING
SHOWING THE ROOFTOP TOWER USING STAAD Pro
Slide 4 : TOWER DESIGN USING MSTOWER
The modeling, analysis and design of the 8m rooftop tower was carried out using MStower.
The rooftop tower was modeled as a three-legged tubular tower and subjected to the requirement of BS8100 Part 1 (Lattice tower and mast; code of practice for loading).
Slide 5 : Design Details:
Modeling parameters:
Reduce level at base of tower: 24m (small b)
Width base of tower: 1.616m
Tower Height: 8m
Section Length: 2m
Loading Criteria:
Mean Wind speed at site: 30m/s.
No Ice condition (remove)
Three Dual band Sectorial antennas at 6m height on tower.
Three 1.2m Diameter Microwave Antenna at 10m height on tower (at 8m height? Max)
Slide 6 : TOWER BUILT UP DATA IN MSTOWER EDIT MSTOWER Software
Slide 7 : TOWER MODEL IN MSTOWER WITH DETAILS OF THE ANCILLIARY MICROWAVE DISH GSM ANTENNA MSTOWER Software
Slide 8 : MSTOWER SUMMARISED GRAPHICAL OUTPUT SHOWING SECTION DESIGN RATIOS MSTOWER Software
Slide 9 : STRUCTURAL ASSESSMENT USING STAAD PRO
AS BUILT RC MODEL OF THE EIGHT FLOOR WAS MODELED IN STAAD Pro
THE AS BUILT SPECIFICATION OF THE REINFORCED CONCRETE ELEMENT IS SPECIFIED.
LOAD DEFINITION OF THE EXISTING STRUCTURE.
SUPERIMPOSITION OF THE TOWER LOAD.
STRUCTURAL ANALYSIS UTILIZING STAAD
POST PROCESSING TO VISUALIZE THE STRUCTURAL BEHAVIOUR
Slide 10 : LOADINGS
SLAB LOADS
SELF WEIGHT (150MM THICK SLAB) - 3.60
ALLOW FOR EXTRA DEAD LOAD - 3.00
DEAD LOAD ON SLAB Gk - 6.60kN/m2
IMPOSED LOAD Qk - 2.50kN/m2
LOAD IMPOSED BY TOWER (FROM MSTOWER)
TOWER REACTION LOADING - 68kN/Leg
TOWER UPLIFT LOAD - 68kN/Leg
Slide 11 : SCHEMATIC OF THE ROOF LAYOUT SHOWING THE POSITIONING OF THE TOWER STAAD Pro
Slide 12 : STRUCTURAL RESPONSE: BENDING MOMENT ENVELOPE AT ROOF LAYOUT STAAD Pro
Slide 13 : RB20 STRUCTURAL RESPONSE OF ROOF BEAM 20: BENDING MOMENT AND SHEAR FORCE DIAGRAM STAAD Pro
Slide 14 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 15 : SCALE Software
Slide 16 : SCALE Software
Slide 17 : RB19 STRUCTURAL RESPONSE OF ROOF BEAM 19: BENDING MOMENT AND SHEAR FORCE DIAGRAM STAAD Pro
Slide 18 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 19 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 20 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 21 : RTB 2 STRUCT RESPONSE OF ROOF TOP BEAM 2: BENDING MOMENT AND SHEAR FORCE DIAGRAM STAAD Pro
Slide 22 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 23 : SCALE Software
Slide 24 : SCALE Software
Slide 25 : RTB 1 STRUCT RESPONSE OF ROOF TOP BEAM 1: BENDING MOMENT AND SHEAR FORCE DIAGRAM STAAD Pro
Slide 26 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 27 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 28 : STRUCTURAL RESPONSE OF SUPPORTING COLUMN SHOWING ULTIMATE AXIAL LOAD STAAD Pro
Slide 29 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 30 : REINFORCED CONCRETE DESIGN CHECK IN SCALE SCALE Software
Slide 31 : CONCLUSION AND RECOMMENDATION
The above presented the design check of an 8m rooftop tower for the university of Ilorin Senate building. The tubular tower model was analyzed using MStower software and the load superimposed into the building model created in Staadpro with the designed loadings to check the structural adequacy of the building with respect to supporting the proposed 8m high rooftop tower.
The existing reinforced structural elements at the eight floor has been checked with respect to the proposed modification with the designed loadings and has been found to be satisfactory in its performance.
A further investigation to ascertain the existing design strength of the structural elements in the building through Non destructive test such as Portable Ultrasonic Non-Destructive Digital Tester (PUNDIT) is recommended.
A detailed model to investigate the overall effect of the proposed modification on the foundation and stability of the whole building should be considered before the modification design is executed.
Slide 32 : THANK YOU