STRUCTURAL DESIGN REPORT
ON
STEEL TRUSS STRUCTURE
SUBMITTED TO
GYAN NIKETAN HIGHER SECONDARY SCHOOL
SUBMITTED BY
Manaslu Engineering Solutions Pvt.Ltd.
DATE: 2016
Table of Contents
TO WHOM IT MAY CONCERN..........................................................................................................2
1. BACKGROUND...........................................................................................................................3
2. SALIENT FEATURES..................................................................................................................3
2.1. PROJECT INFORMATION......................................................................................................3
2.2. BUILDING FEATURE..............................................................................................................3
2.3. SITE CONDITION....................................................................................................................3
3. SPECIFICATION OF MATERIALS.............................................................................................3
4. LOAD COMBINATIONS:............................................................................................................5
5. DESIGN OF STRUCTURAL MEMBERS....................................................................................5
5.1. DESIGN ASSUMPTIONS........................................................................................................5
5.2. DESIGN METHODOLOGY.....................................................................................................5
5.3. OUTPUT MEMBER.................................................................................................................5
6.DESIGN DATA FROM SAP:.............................................................................................................6
6.1.3D MODEL IN SAP........................................................................................................................6
6.2.WIND LOADS AND EARTHQUAKE LOADS.............................................................................7
6.3.DESIGN CHECK OF 100x100x4 MM COLUMNS.......................................................................8
6.5 DESIGN CHECK OF 38x38x4 MM struts......................................................................................9
6.6 DESIGN CHECK OF 50X50X4 MM RAFTERS.........................................................................10
7. MANUAL DESIGN OF PURLINS.................................................................................................11
8. DESIGN SUMMARY OF RCC COLUMN IN THE FOUNDATION.............................................13
9.0.DESIGN RESULT OF RCC BEAMS............................................................................................15
9.0.DESIGN OF FOUNDATIONS......................................................................................................16
TO WHOM IT MAY CONCERN
This report comprises the summary of the design of Single Storied Steel Truss Structure for
Gyan Niketan Higher Secondary School. The report consists of the design procedure
adopted, assumptions made and input and output from the design and analysis. It is assumed
that the Client will completely follow the Structural Design specified in the form of Design
Drawings attached in the report.
The Designer will not be responsible if any alteration to the structural system and
configuration made by Client without consultation and permission from the Designer.
The design calculations and derivations are limited to only a minimum to let the concerned
people know the methodology adopted. However, the calculations may be provided to the
Client or the concerned Authority upon request.
.............................
Er. Mukesh Kafle
1. BACKGROUND
This report consists of structural analysis and design of a Single Storied Steel Truss Structure
in a summarized form. However, a set of detailed design drawings is included in order to
make it easy for the Fabricator and Civil Contractor.
The analysis and design has been based on Indian Standard Codes.
2. SALIENT FEATURES
2.1. PROJECT INFORMATION
Project: Gyan Niketan Higher Secondary School
Location: Shankhamul, Kathmandu
2.2. BUILDING FEATURE
Structure Type: Steel Truss (Super Structure) with pre-fab panel infill
RCC Structure (Foundation)
Building Purpose: School Building
Plinth Area: 1366.03 sq.ft.
Storey: 2 Storey
Plinth Height: 3 ft. from Ground
Foundation Depth: 5 ft. from Ground
Ridge Level: 9.44 m for footing level
Structure Type: Steel Structure
2.3. SITE CONDITION
Basic Wind Velocity: 47 m/s
3. SPECIFICATION OF MATERIALS
Foundation:
Grade of Concrete: M20
Grade of Steel: FE 415
Unit Weight of Concrete: 25 KN/m3
Non Structural Components:
Grade of PCC: M15
Unit Weight of Concrete: 25 KN/m3
Steel Structure:
Grade of Steel: FE 250
Yield Stress: 250 N/mm2
Unit Weight: 7850 kg/m3
Materials:
Walls: Pre Fabricated Sandwich Panel
Roofing Materials:
Sheets: 26 gauge G.I. sheets (corrugated galvanized sheets)
Ridge Cover: 0.759 mm thick galvanized sheets
Nut Bolts:
Yield Stress of Anchor Bolts: 210 N/mm2
4. LOAD COMBINATIONS:
COMBINATION 1: DL+LL EQ
COMBINATION 2: DL +LL Wind
COMBINATION 3: DL
COMBINATION 4: DL+LL
5. DESIGN OF STRUCTURAL MEMBERS
5.1. DESIGN ASSUMPTIONS
Foundations
The safe bearing capacity (SBC) of the soil is taken to be 100 KN/m2 (as no soil test data
provided). The depth of the foundation is 1.2 m. It is assumed that the soil below is
converted to a firm base by proper compaction or by any convenient means or as directed
by the site engineer.
Truss Element
The truss elements are designed by hollow square pipes.
Columns
The columns are hollow square pipes.
Anchoring
The superstructure is connected to the foundation by anchor bolts.
5.2. DESIGN METHODOLOGY
The analysis and design of the structure is carried out by using the software SAP2000
v.16 as per IS 800: 1984. The responses are closely observed and checked for all critical
cases.
5.3. OUTPUT MEMBER
S.N. MEMBERS SIZE
A TRUSS MEMBERS
1 TOP CHORD 50MM
2 BOTTOM CHORD 50MM
3 COLUMNS DOUBLE C 100 MM
4 BEAMS ISMB 150 MM
5 BRACINGS 100 MM AND 75MM
6 STRUTS 50MM
B COLUMNS 100MM
6.DESIGN DATA FROM SAP:
6.1.3D MODEL IN SAP
DEFLECTED SHAPE DUE TO EARTHQUAKE LOAD IN X-DIRECTION
DEFLECTED SHAPE DUE TO EARTHQUAKE LOAD IN Y-DIRECTION
6.2.WIND LOADS AND EARTHQUAKE LOADS
TABLE: Auto Seismic - User Coefficient
LoadPat Dir PercentEcc EccOverride UserZ C K WeightUsed BaseShear
Text Text Unitless Yes/No Yes/No Unitless Unitless KN KN
eqx X 0.05 No No 0.12 1 1228.958 147.475
eqy Y 0.05 No No 0.12 1 1228.958 147.475
TABLE: Base Reactions
OutputCase CaseType GlobalFX GlobalFY GlobalFZ GlobalMX GlobalMY GlobalMZ
Text Text KN KN KN KN-m KN-m KN-m
wind LinStatic -246.677 -9.488E-11 -3.461E-12 4.905E-10 -1053.388 1657.0802
eqx LinStatic -147.475 -1.028E-10 -2.708E-12 5.505E-10 -820.3086 1498.0141
eqy LinStatic -8.119E-11 -147.475 -6.921E-12 820.3086 -4.011E-10 -790.4396
wind2 LinStatic 2.99E-12 -197.303 -6.784E-12 935.593 5.68E-11 -1476.4459
6.3.DESIGN CHECK OF DOUBLE C CHANNEL COLUMNS
6.4 DESIGN CHECK OF ISMB BEAMS
6.6 DESIGN CHECK OF 50X50X4 MM RAFTERS
6.6 DESIGN CHECK OF 50X50X4 MM STRUTS
7. MANUAL DESIGN OF PURLINS
DESIGN OF ROOF TRUSS
DESIGN OF THE PURLINS
DESIGN OF THE
PURLINS
Load
Spacing between
the truss = 2.72 m
Galvanized
Corrugaed Iron 146.3 N/
Sheets = 0 m2
Weight of Purlins 150.0 N/
(assumed) = 0 m2
Weight of Bracings N/
(assumed) = 15.00 m2
degre
Angle = 24 e
530.0 N/
Live Load = 0 m2
865.3 N/
= 0 m2
kN/m
= 0.87 2
Spacing of the
purlins = 0.70 m
kN
Total Load = 0.61 /m
kN -
Total Moment = 0.45 m
2,845. mm
Section Modulus = 26 3
= 2.85 cm3
Use 50 mm circular
pipes
8. DESIGN SUMMARY OF RCC COLUMN IN THE FOUNDATION
9.0.DESIGN RESULT OF RCC BEAMS
9.1.DESIGN OF FOUNDATIONS
