LIQUID RETAINING STRUCTURES

Transcription

1 LIQUID RETAINING STRUCTURES Basic and advanced practical guidance for the design and construction of economical, leak tight and durable liquid retaining structures in reinforced or post-tensioned concrete. UP TO 3 CPD CREDITS FROM R 2500 PD EARLY BIRD Stellenbosch University, Dept of Civil Engineering Mon 16 - Tu 17 April 2018 Johannesburg, The Aviator Hotel Wed 18 - Fri 20 April 2018 Register: Complete last page & return Enquiries: civilcourses@sun.ac.za

2 SEMINAR OBJECTIVE Over three days the seminar aims to answer the most pertinent questions of the client, designer and contractor tasked with delivering liquid retaining structures in reinforced concrete. Engineers who attend should walk away with an understanding of the design considerations and process; and appreciation for aspects that need adequate on-site implementation, including mix design, joint choices, casting sequence, and repair. Post-tensioned reservoirs are treated as an advanced topic as is the comparison of BS 8007 to Eurocode 2. Day one provides detailed guidance on how to analyse and design liquid retaining structures for both load induced and restraint action. Day two gives practical advice for successful implementation on site (do s and don t s). Day three (only in Johannesburg) covers advanced design concepts, incl. post tensioned reservoirs, crack models and standardisation (BS8007 vs EC2). The seminar will equip the engineer with understanding of pertinent design assumptions, analysis options and how to use the output in design as well as practical considerations for successful implementation on site. SEMINAR FOCAL POINTS The focus will be on: Conceptual design Analysis options, use of output and the effect of boundary conditions Design for load induced and restraint action (thermal & shrinkage) Practical on-site advice to create durable and leak tight structures Case studies Repair of typical defects Crash course on post-tension reservoir design A comparison of BS 8007 vs Eurocode 2 provisions Introducing software to aid in design according to BS 8007 or Eurocode; and for post-tension reservoir design. Design examples will be provided.

3 PROGRAM TIME TOPIC D AY I Getting the BASICS right - DESIGN SPEAKER 07:00-07:20 Registration and refreshments Note: In STELLENBOSCH the program starts 1 hour later. 07:20-07:30 07:30-08:20 Welcome & Introduction Overview Typical structures and models; Design stages; Forces, structural behaviour and critical sections; Most important design considerations Celeste Viljoen Conceptual design 08:20-09:00 Structure shape, size and type; Main considerations Action combinations 08:20-09:00 Load cases to consider; Restraint induced action 09:30-10:00 10:00-10:45 10:45-11:15 11:15-12:00 12:00-13:00 13:00-13:45 Analysis Primary analysis methods; Use of examples to compare analysis methods Influence of boundary conditions Intuition quiz - Influence of boundary conditions Analysis Practical application of analytical tools: Tables (Handling boundary conditions & example); FEA (Practical modelling options); Output form & use Lunch Basics of design Direct and Restraint action; Limit states; Useful references & Handbooks 13:45-14:30 Load induced crack width calculations Provisions of SANS ; Tightness class selection; Crack width limit 14:30-14:50 14:50-15:30 Design for restraint induced action Thermal & Shrinkage; Short & Long term considerations; Provisions of CIRIA C660; Reinforcement calculation 15:30-16:10 Movement joints - to use or not to use? Design & construction; Cost, risk and maintenance considerations Closing remarks - Three DO's Three DON'Ts 16:10-16:30 The three most important design aspects to get right; Avoid these three most common design mistakes

4 PROGRAM TIME TOPIC D AY I I Getting the BASICS right - IMPLEMENTATION SPEAKER 07:00-07:20 Registration & Refreshments Note: In STELLENBOSCH the program starts 1 hour later. 07:20-07:30 07:30-08:00 Welcome & Introduction Requirements for liquid retaining structures Economy; Leak tightness; Durability & other; Main aspects to control to achieve satisfactory performance Celeste Viljoen Prevention of leakage 08:00-08:45 Construction joints do's & don'ts; Movement joints; Penetrations; Prevention of early age thermal cracking; Detection of floor leaks 08:45-09:30 Ensuring Durability Mix design; Alkali-Silica Reaction; Compaction; Curing and protection 09:30-10:00 10:00-11:30 Case studies Typical problems; Discussion of the mistakes that contributed to the problems and how to avoid them Erhard Kruger 11:30-12:30 Lunch 12:30-13:15 Construction aspects to consider during design Pour sequence and its influence on restraint action; Positioning of joints; Detailing considerations 13:15-14:00 Project specification guidelines Role and importance; Most important aspects to control to achieve satisfactory performance Erhard Kruger 14:00-14:30 14:30-15:15 Repair Typical defects; Practical recommendations for repair of typical defects 15:15-16:00 Panel discussion Avoiding typical problems, Design considerations, Joint specification, Geotechnical considerations etc.; Question & Discussion session Robin Erhard Celeste Closure

5 PROGRAM TIME TOPIC D AY I I I PT tank design Standards & models SPEAKER 07:00-07:20 07:20-07:30 Registration & Refreshments Welcome & Introduction Celeste Viljoen 07:30-09:00 Design of Post-tensioned tanks Analysis Tightness class and philosophy; Load combinations; Prestress and boundary conditions Design 09:00-09:30 Prestress force profile 09:30-10:00 10:00-11:00 11:00-12:00 Design Concrete strength and wall thickness; Arrangement and sizing of buttresses Implementation Stressing sequence; Specification for prestress design and supply 12:00-13:00 13:00-13:30 13:30-14:15 Lunch BS 8007 vs EC2 Comparative overview Crack width calculation The South African perspective Crack models and Standardisation Erhard Kruger Crack widths - Part I 14:15-15:00 Crack zone; Fully formed system; End restraint system 15:00-15:30 15:30-16:15 Crack widths - Part II EC2 formulae; Concrete stiffening; Mean concrete strain; Crack inducing strain; EC2 concrete stiffening limits; Strain adjacent to crack 16:15-16:45 Crack width limits Self-healing of cracks; Head/thickness flow rates; Full thickness cracks; Leakage vs durability Closure Discussion Q&A

6 PRESENTERS (CEng) (PrTechEng) Erhard Kruger (PrEng) Celeste Viljoen (PrEng) Mr (BSc, CEng, FICE, FIStructE) is an experienced UK design engineer, currently a partner at HAC LLP in Bourne End, Bucks. He specialises in the design of liquid retaining structures and lectures on the design of these structures to the British and Eurocodes. He has published several articles on the subject. He is an IStructE 'Eurochampion' (representative on the Eurocodes) and is currently the Thames Valley Regional Group representative on IStructE Council and a member of the Engineering Practice committee. He also serves on the CIRIA C660 review committee Mr (NHDip, PrTechEng) is an experienced South African design engineer. He is the founder of Res Spec Consulting, specialising in the design of liquid retaining structures. He has designed over 30 large post tensioned reservoirs and has peer reviewed numerous complex designs. He is a member of the WRC task group developing construction guidelines for liquid retaining structures. Mr Erhard Kruger (BEng, MEng, PrEng) is a South African design engineer with many years of experience in the design, construction and remediation of liquid retaining structures. He is a member of the working group developing SANS : The design of concrete liquid retaining structures where he champions the crack width provisions. Prof Celeste Viljoen (PhD, PrEng) is an associate professor at the University of Stellenbosch, where she heads the Structural Risk and Reliability research group. She is widely involved in structural standardisation, being a member of the SABS Technical Commitee for Concrete Structures, convenor of the working group for SANS : The design of concrete liquid retaining structures and a member of the International Joint Committee on Structural Safety.

7 CPD CREDITS The seminar is accredited for 1, 2 or 3 Continued Professional Development credit with the ECSA, according to the number of days you attend. REGISTRATION Please register online at You are welcome to attend any combination of days. Please fill in the registration details (next page) and return this by to Janine. She will generate your invoice accordingly. PAYMENT 1 Day: R Days: R Days: R Payment must be received 5 working days prior to the course date ~ Attend any number or combination of days. ~ Early Bird: 15% discount Payment must be received by 16 March 2018 WE LOOK FORWARD TO WELCOMING YOU AT THIS COURSE

8 LIQUID RETAINING STRUCTURES DESIGN & CONSTRUCTION & April 2018 REGISTRATION DETAILS Please note there is also an online registration process link will be forwarded Title Surname Name You wish to attend: (please circle) Stellenbosch: Day 1 Stb 16 April Day 2 Stb 17 April Johannesburg: Day 1 Jhb 18 April Day 2 Jhb 19 April Day 3 Jhb 20 April Meal preference (X) Halaal: Vegetarian: Other: Your Company name & address Your Cell: Tel no: Invoice for attention: Cancella ons will be accepted in wri ng and without penalty, up to 10 working days prior to commencement of the course. Par cipants cancelling in wri ng less than 10 working days prior to commencement of the course will be liable for a 50% cancella on fee. Following registra on without a endance and without wri en cancella on, delegates will be held responsible for the full course cost. I SIGNED: DATE: Enquiries: Janine / Tsholofelo Tel : civilcourses@sun.ac.za