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  1. KOKONIS36

    Computer program for integral abutment bridges

    What is a good program for analysis of integral abutment bridges? Probably using finite element analysis?
  2. KOKONIS36

    Nominal yield stress

    What is the definition of the nominal yield stress?
  3. KOKONIS36

    Axially loaded pipes with internal pressure

    Does anyone know or has any references on how to derive the equation for an axially-loaded pipe with internal pressure. I think the critical buckling load comes Pcr. =EI(pi)(pi)/(L)(L) which is the same as an axially loaded pipe without internal pressure. But how do you prove it?
  4. KOKONIS36

    Plastic shear resistance of steel pipes

    But my calculation indicates (pi)rt(Fy/sqrt(3)), that is, 3.14rt(Fy/sqrt(3)), not 4rt(Fy/sqrt(3)) Why I'm geting this difference? 3.14 instead of 4?
  5. KOKONIS36

    Plastic shear resistance of steel pipes

    Any reference on how to derive the plastic shear resistance of a steel pipe given by the expression' Vp = 4rt(Fy/sqrt(3))where Fy/sqrt(3)is the Von Mises yield criterion
  6. KOKONIS36

    Response modification factor for seismic-isolated bridges

    My question is related to the Response modification factors of the foundations of seismic-isolated bridges. According to the AASHTO Guide Specifications for Seismic Isolation Design "the response modification factor for all substructures shall be half of those given in table 3.7 of the AASHTO...
  7. KOKONIS36

    Seismic isolation bearings

    The conventional practice is to use only one type of bearings on a bridge. Is there any refeence to this "rule"?
  8. KOKONIS36

    Hybrid steel girders

    AASHTO Guide Specifications for Horizontally Curved Steel Girder Highway Bridges do not provide any information on hybrid girders. Do I have to assume that we can't use hybrid girders on curved alignment due to lack of Sprcification?
  9. KOKONIS36

    Plastic hinges

    Thank you very much for the response. However, I like to ask a few more questions on this subject. 1. What do you mean by "properly placed hinge"? Is this the point of expected maximum moment? Or maximim shear? How do you select the location of plastic hinge? 2. You're saying that the hinge is...
  10. KOKONIS36

    Plastic hinges

    Can anyone explain to me in simple language why do we need plastic hinges in structural analysis?
  11. KOKONIS36

    Bridge Seismic isolation systems

    Yes ,this is R.J.Watson system,otherwise Known as EQS.I can understand its advantages.What about its disadvantages ?
  12. KOKONIS36

    Bridge Seismic isolation systems

    The Eradiquake Sliding isolation bearing and the Elastoplastic seismic isolation system are the least Known seismic isolation systems for bridges.What are their advantages and disadvantages ?
  13. KOKONIS36

    Stiffening girders of cable-stayed bridges

    What are the design requirements for stiffening girders of cable-stayed bridges ?Any deflection limitations ?
  14. KOKONIS36

    Fracture Mechanics applications to Bridges

    What are the major applications of fracture mechanics on bridges ?Any references on this particular application of fracture mechanics ?
  15. KOKONIS36

    Bridge damping

    Bridge damping is customarily 5%.But actually the damping ratio has a range e.g. 3% to 7% i.e. is not a fixed number.What is the range of damping ratio for a steel girder bridge ,a reinforced concrete bridge and a prestressed concrete bridge ?
  16. KOKONIS36

    Exodermic decks

    What is the span range at which use of exodermic decks becomes economically competitive with the tranditional reinforced concrete deck slab ?
  17. KOKONIS36

    Stiffness of Pot Bearings

    I am using the SEISAB program to get the seismic forces.Pot bearings will be used and I have to input their stiffness.Any ideas about the stiffness of both expansion and fixed bearings ?
  18. KOKONIS36

    Period of a simple span Bridge

    You mention nothing about the stiffness of the abutments.In your opinion abutment stiffness shall not be included in the calculation of the period of a simple span bridge ?
  19. KOKONIS36

    Period of a simple span Bridge

    How can I calculate the period of a simple span bridge ?How the period is affected if the Bridge is jointless i.e.there is no joint between the deck slab and the approach slab.
  20. KOKONIS36

    Seismic requirements for Bridge superstructure

    What are the seismic requirements for Concrete and steel superstructures ? Any references ?

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