1 AFTHAP m2 10.03 Luis A. Agudo Fernández AFTHAP CONFERENCE REINFORCED AND PRESTRESSED CONCRETE...
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Transcript of 1 AFTHAP m2 10.03 Luis A. Agudo Fernández AFTHAP CONFERENCE REINFORCED AND PRESTRESSED CONCRETE...
1AFTHAP m2 10.03
Luis A. Agudo Fernández
AFTHAP CONFERENCE www.afthap.com
REINFORCED AND PRESTRESSED CONCRETE PIPE, STEEL CYLINDER TYPE
Module 2:Structural designHydraulic design
Protection measures in special cases
Pressure› Steady state, design pressure (DP)› Transient. Maximum design pressure (MDP)› System test pressure (STP)› Factory test pressure (PP)
External loads› Steady, earths› Accidental, traffic› Special, tunnels, footings, and so.
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Actions
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Support conditions
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Example 1, gravity pipeline
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Example 2, forced main
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Trench, compacted or non-compacted
Negative projection embankment
Embankment
Types of installation - Marston
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Live - traffic
Tunnel excavation Footings loads Other loads
The software allows to replace the load calculated according to Marston by a surface load calculated by any other method (i.e. in the case of tunnels)
Really local loads, such as footings, are usually solved by filling the trench with concrete in the involved area.
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Special loads
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Maximim design pressure (MDP) + dead loads
Design pressure (DP) + dead loads + live loads
Factory test pressure (PP)
System test pressure (STP) + dead loads corresponding to 1 m of earth height
Pressure zero + dead loads + live loads
DESIGN HYPOTHESIS reinforced concrete:the allowable stresses will not be exceeded (2/3 Elastic Limit) in the following design hypothesis
Hypothesis Stress in core
Design Pressure DP + dead loads ≥0.5 Mp
Max Design Pressure MDP+0.1 Mp + dead loads ≤ fct,k
Design Pressure DP + dead loads + live loads ≥0.0 Mp
Max Design Pressure MDP ≥0.5 Mp
Factory Test Pressure PP ≥0.5 Mp
System Test Pressure + 1 m tierra ≥0.5 Mp
Dead + Live loads, without pressure ≥0.5 Mp
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• During the manufacturing and evolution of the prestressed concrete the allowable values of compressive and tensile strengths in the active reinforcement will not be exceeded
Prestressed concrete
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Diameter 1200, the biggest of the following values:
Diameter > 1200, the biggest of the following values:
Maximum design pressure (MDP) + 0.2 Mpa
PMaximum design pressure (MDP) + 0.1 Mpa
1.2 times the maximum design pressure (MDP)
1.2 times the maximum design pressure (MDP)
FACTORY TEST PRESSURE (PP)Reinforced concrete steel cylinder type
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Pressure that produces a stress of – 0.5 MPa on the pipe wall
FACTORY TEST PRESSURE (PP)Prestressed concrete steel cylinder type
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CALCULATED
Water Hammer
NOT CALCULATED
Water hammerthe LOWER of the following values
Maximim design pressure (MDPc) + 100 kPa
1.5 * Maximum design pressure (MDPa)
Maximum design pressure (MDPa) + 500 kPa
System test pressure (STP)
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It can be free downloaded from › www.afthap.com
For any doubts regarding the use of the software, please contact the association through our web site
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Software for pipes design
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Hydraulic design
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Author Year
Manning 1890
Scimemi 1925
Hazen-Williams 1905
Meyer-Peter ~ 1930
Ludin ~ 1920
Scobey 1931
Darcy - Weisbach 1775
Colebrook 1939
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Anachronisms of the correlations• Short pipes, more joints (2.5 m against current 6-7)• Worse quality concretes• Tests for small diameters
TIME LINE
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Aggressive enviroments Aggressive fluids to be carried Low-resistivity soils Stray currents
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Extraordinary protection measures
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The discontinuity of the elastic joint makes currents circulation difficult and benefits the pipe (IET 07 2.4 appendixe 3)