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Professional Review ExaminationProfessional Review ExaminationIESLIESL
AUGUST/SEPTEMBER 2012AUGUST/SEPTEMBER 2012
Eng. M.G.P.S. Ranasinghe
(A/M 12594)
Reg. No C-15
1. Introduction
2. Recognized Training & Responsible Experience
3. Designs
OUTLINE OF THE OUTLINE OF THE PRESENTATIONPRESENTATION
oUnderstanding engineering principles
oApplying engineering knowledge & expertise
oLeadership & management
oCommunication & inter-personal skills
oProfessional conduct
INTRODUCTIONINTRODUCTIONTrainee Engineer (Prior to Graduation)
Trainee Engineer (After Graduation)
Responsible Experience
Recognized TrainingRecognized TrainingPhase Employer Duration Designation
Prior to Graduation
Sanken Lanka (Pvt) Ltd.
22.05.2006-29.09.2006( 4 months )
Apprentice
Agriculture buildingAgriculture building– Sabaragamuwa UniversityFrom22– 08 – 2007 to 31 – 08 - 2008
Philip Gunawardhana Play groundPhilip Gunawardhana Play ground– AwissawellaFrom 01 – 09 – 2008 to 30 – 09 - 2009
Responsible ExperienceResponsible ExperiencePhase Employer Duration Designation
After GraduationCentral Engineering Consultancy Bureau
01.10.2009-30.03.2010( 06 months )
Resident Engineer
01.04.2010-30.11.2010( 08 months )
Resident Engineer
01.12.2010-01.06.2011( 6 months )
Resident Engineer
01.12.2011-15.06.2012( 6 1/2 months )
Design Engineer
Accident & Emergency ComplexAccident & Emergency Complex– Ratnapura01.10.2009-30.03.2010
Soil nailing project at Kiriella police stationSoil nailing project at Kiriella police station01.04.2010-30.11.2010
At the same time…At the same time…
Construction of Bridge Construction of Bridge – Wee oyaWee oya01.12.2010-01.06.2011
Constantly following specifications , guidelines and circulars while making decisions related to technical aspects.
Quality control of materials during the stages of procuring, internal transport, construction etc.
Proposing and implementing soil improvement and structure reinforcing methods.
Ensuring the project program and labor histogram are maintained properly.
Practical Applications, Based on The Practical Applications, Based on The Understanding of Engineering PrinciplesUnderstanding of Engineering Principles
Guide & supervise the supervisors, sub contractors and labour force to achieve targets.
Preparation of construction program, periodically reviewing of work progress and re-scheduling if any balance work to achieve targets.
Maintain a solid relationship with the client and consultant in order to identify client requirements and solve problems to deliver a good product.
Arrange training programs to train the subordinates to deliver more efficient and quality outputs.
Leadership & ManagementLeadership & Management
Holding weekly site meetings, preparation of minutes and maintaining corrective/preventive action logs.
Preparation of detailed progress report for monthly meeting and presenting at meeting.
Maintaining a good rapport with the local community by respecting their ideas/suggestions.
Staffing Promoting team work among each and every individual. Communicating with relevant authorities in written form ,
and using internal memo formats to address issues within the CECB.
Communication & Interpersonal SkillsCommunication & Interpersonal Skills
Attended annual general meetings, site visits and social works activities organized by the IESL , the CECB and universities.
Ensured health and safety on site during construction Perform micro environmental impact assessments in every
critical stage of the project. Engaged CPD courses
Workshops, seminars and short courses on Design of Structures - 40 hrsComputer Aided Structural Design - 32 hrsSewage , Water supply and drainage - 32 hrsCareer guidance, marketing & management - 40 hrs
Professional ConductProfessional Conduct
Design Loading calculation and Initial Member Sizing (BS 6399:Part 1,3:1996,1988,Istruct. Manual 1985 CP3:Chapter V-part2-1972) Calculate Bending moment and shear force ManuallyUsing Software
• Make the model using PROKON , SAP2000 or STAAD.Pro• Analyse the model & get results
Perform design calculations using BS 8110:Part 1,2 and 3 :1985
Knowledge & Understanding of Knowledge & Understanding of Engineering PrinciplesEngineering Principles
Proposed building for the unit of Siddha medicine for Jaffna
University of Sri Lanka .
CECB office building - Puttalam.
Substructure of bridge across Yan oya -26.8 m span
(abutments, wing walls and pier)
Protection wall for right bank channel of Chandrika wewa
Apart from the above mentioned, I was also involved in
designing structures such as RRM & Reinforced Concrete
retaining walls, trusses, footings etc.
DesignsDesigns
Design Flow DiagramDesign Flow Diagram
Live loads Stairs, corridors & other areas with access - 4.0 kN/m2
Toilets - 2.0 kN/m2
Temporary partitions - 1 kN/m2
Ceiling & Services - 1.5 kN/m2
Dead Loads Floor finishes - 1.8 kN/m2
Materials Self weight of concrete - 24kN/m3
Characteristic Strength of Concrete (fcu) - 45N/mm2
Yield strength of Tor Steel - 460 N/mm2
Yield strength of Mild Steel - 250 N/mm2
Bearing capacity of soil - 175 kN/m2
Basic Design InformationBasic Design Information
The structure is simplified in to 2D sub frames.
Pinned connection is assumed for the connection between the column and foundation.
The stiffness of the beams while performing sub frame analysis should be taken as half of the original stiffness of the member.
AssumptionsAssumptions
Slab (Thickness) Selection of cover: Exposure condition & Fire resistance Span/ effective depth ratio: Imposed Load & type of slab Minimum slab thickness: Fire resistance
Beam (Width & Depth)Width Selection of cover: Exposure condition & Fire resistance Minimum beam width: Fire resistanceDepth Span/ effective depth ratio: type of beam
Column (Width) Selection of cover: Exposure condition & Fire resistance Minimum column width: Fire resistance Ultimate load capacity,
cuycuc
fffA
N35.067.0
10035.0
Initial member sizingInitial member sizing
o Calculate the design load = o Calculate bending moment o Calculate shear force o Calculate reinforcement.
k < 0.156, Compression R/F not required
As req = (M/0.87fyz)
2xsxsx nlM
2xsysy nlM
kk qg 6.14.1
xvxsx nlV xsysy nlV
cufbd
Mk
2
dk
dz 95.09.0
25.05.05.0
Design of slabsDesign of slabs
vsy2
vsx2
vsy1
o Check for minimum and maximum spacing
3d or 750mm whichever lesser
o Check for deflection.
Actual (span/d.eff) < Allowable (span/d.eff)
Allowable (span/d.eff) = Basic (span/d.eff) x F1 x F2
o Check for shear.
Design shear stress,
Design concrete shear stress,
or 5N/mm2 , No Shear R/F
o Detailing Curtailment , Laps and Anchorage
cvv
4
13
1
40010079.0
ddb
Av
v
s
mc
bd
Vv
cuf8.0
DesignDesign of beamsof beams
Typical loading conditions along the beam
Cross section of a “T-Beam”
Design for bendingCalculate fixed end moment and distribute according to their stiffness.Calculate shear forceCarry out the same procedure for all three load cases & draw the BM
and SF envelopCarry out moment redistributionCalculate reinforcement for bending.Curtailment of reinforcement.Check for minimum and maximum area of reinforcementDetailing
Design of beamsDesign of beams
Design for shear Calculate maximum shear stress considering enhance
shear resistance at support (v) Maximum shear stress < lesser of 0.8√fcu or 5N/mm2
Calculate design concrete stress (vc) Calculate shear reinforcement according relationship of v
and vc
Check for maximum spacing of Shear reinforcement
Serviceability checks Check for deflection Check for crack width
Controlled by spacing of reinforcement properly
Design of Beams Continued…Design of Beams Continued…
Select suitable rise and going by considering the comfort of the users.
Following concept considered in designing of Staircase Design ultimate load assumed to be uniformly distributed over
plane area of the S/CSpan should be taken as lesser of horizontal distance between
center line of supports or clear distance between face of supports plus effective depth.
Designed for maximum BMIf flight occupies 60% of span, span/ eff: Depth, calculated by
Cl 3.4.6.3 may be increased 15% in S/C where without stringer beam.
Recommendation given for slabs and beams also apply for the S/C
Design of staircaseDesign of staircase
o Calculate the horizontal & vertical loadso Analyze the frames for different loading combinations & obtain the moments in both directions & axial load
Loads on Sub Frame along Grid B/ (1a-2a)
Loads on Frame Along Grid 2/(A1-D1)
Frame analysis & column design Frame analysis & column design
o Calculate axial load and initial bending moment.
2D frame analysis is carried out as a conservative design
approach.
Considering the shape of the structure the lateral load is
critical in the shorter span , therefore the lateral load is
considered in the shorter span and sub frame analysis is done
in the longer span.o Calculate Madd and Mmin
o Design moment, Mx = Mix + Madd x
My = Miy + Madd y
o Biaxial bending Mx/h’ >=My/b’ , Mx’=Mx+β(h’/b’)My Mx/h’ <=My/b’ , My’=My+β(b’/h’)Mx
Design of ColumnsDesign of Columns
o Calculate d/h, N/bh, M/bh2
o Obtain 100Asc/bh o Find out the critical loading combination & As req o Carry out the following checks
Crack due to bending, N > 0.2fcuAc
Shear, M/N < 0.75hDeflection, le/h < 30Minimum R/f & Max. R/f
o Design of linkso Detailing
CurtailmentLapsAnchorage
Design of Columns Continued…Design of Columns Continued…
According to the soil investigation report the bearing capacity of the soil was 175kN/m2
Pad footings were selected for economical purposes.Calculate the Bending Moment and Shear Force along
the footing.
Check for effective depth of base (d), to satisfy
punching shear
Design of FoundationDesign of Foundation
Nd 10
oDesign for bendingUltimate bearing pressureCritical bending moment Calculate reinforcementDistribution of reinforcement can be banded if,
oCheck for Shear Vertical line : At distance 1.0d from the facePunching Shear: At 1.5d from the face
oMinimum & Maximum reinforcement
oSpacing of the reinforcement & Crack width Check
4
9
4
3 dcle
Design of Foundation Continued…Design of Foundation Continued…