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…