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  • Users: cecil123
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  1. cecil123

    Fire Resistance:composite sections

    I have a concrete filled hollow steel section incorporating an I section inside it. Now, I want to determine the temperature distribution throughout the section when the column is heated on all 4 sides for a rating R60 (6o minutes duration of fire) I do not want to take up FE thermal analysis...
  2. cecil123

    Composite column:Fire resistance

    Let us say i have a composite column section consisting of structural steel, concrete and reinforcing steel. Under fire, as per eurocode, we need to divide the column section into various layers and get the temperature in every layer. What is the reason that the temmperature in every layer...
  3. cecil123

    Load introduction:composite columns

    I need to design shear connectors in regions of load introduction for composite columns.I am referring Eurocode4 for the purpose.Am looking for some solved examples for the purpose to make sure am applying the codal provisions correctly.Can anyone help me with this??Please , very very urgent!!
  4. cecil123

    Creep Coefficient

    For calculating the creep coefficient as per Eurocode2, I need the perimeter of the member in contact with the atmosphere(denoted by "u") If the area of cross section of the member is "A". Length of the member (member is a column)is "L", what should be the perimeter "u".Should it be "4 x L"...
  5. cecil123

    Composite Columns

    For a concrete encased hollow circular steel section (compposite section), the Eurocode4 says that its section axial resistance may be enhanced to the effect of confining provided the non-dimensional slenderness(which is the ratio of plastic resistance to axial compression to the elastic...
  6. cecil123

    Composite Column Design:Shear resistance

    For a composite column section: The design shear resistance (?RD) due to chemical bond and friction is limited to the following values (as per the EuroCode4): 1)For fully concrete encased I sections: 0.6 N/mm2 2)For concrete filled hollow sections: 0.4 N/mm2 3)For flanges in partially I...
  7. cecil123

    Concrete Encased Hollow Circular Steel Section

    For a concrete encased hollow circular steel section (compposite section), the Eurocode4 says that its section axial resistance may be enhanced to the effect of confining provided the non-dimensional slenderness(which is the ratio of plastic resistance to axial compression to the elastic...
  8. cecil123

    Interaction Curves:Composite Column Sections

    I need to develop Interaction curves for composite column sections(symmetrical sections).Have been going through the EC4 but unable to get the logic?Can anyone help me?Urgent!!
  9. cecil123

    Composite Column Design

    Though I have designed reinforced concrete columns and some steel columns in the past, am relatively new to composite column design.Currently getting familiar with Euro code(EC4) provisions.Have the following questions: 1.Why is that the effect of long term loading is taken into account only if...
  10. cecil123

    PT Slab: Ultimate Moment Capacity check

    I have been designing a PT Slab and am using hand computations first to get more involved and familiarised with the design procedure. I am using BS Code and the Concrete society handbook on Post-Tensioned Concrete Floors.I have the following questions: 1. I have computed losses and have...
  11. cecil123

    PT Slab Design

    I am designing a PT Slab with unbonded tendons.Now, I have determined the post-tensioning forces required in each span based on the considerations of: 1)Permissable Tensile stress 2)Minimum and maximum Precompression 3)Percentage of Dead load balanced 4)Maximum spacing of tendons. Now, as...
  12. cecil123

    Euro Code

    Can anyone tell me which is the Euro Code pertaining to Pre-stressed concrete structures? Thanks in advance!!
  13. cecil123

    Vibrations:Reinforced Concrete

    Does vibaratory loading alter the strength of concrete and reinforced concrete compared to normal static loading?
  14. cecil123

    Post-Tensioning Design (ADAPT Procedure)

    Am currently preparing a spreadsheet based program for post tensioned slab design based on effective force approach (wherein no computation of prestress loss is carried out)and the program outputs only the PT forces: To arrive at an optimized force in each span we carry out the following...
  15. cecil123

    Calculation of prestress losses:Approach

    I am carying out a design of a post-tensioned floor - a flat slab using hand calculations first. Now, I have assumed a slab depth, a reversed parabolic profile, and calculated the prestressing force required to balance the dead load. I obtain the number of tendons in each span, ASSUMING A 20%...
  16. cecil123

    Post Tensioned Concrete(2)

    Hi: To add to my earlier post the question 2 below -- I am relatively new to the design of pre stressed concrete (studied way long).What I want know is, that when checking for ultimate limit state, the applied moments are specifies as "secondary moments + factored dead&live load moments".These...
  17. cecil123

    Post Tensioned Concrete

    Hi: I am relatively new to the design of pre stressed concrete (studied way long).What I want know is, that when checking for ultimate limit state, the applied moments are specifies as "secondary moments + factored dead&live load moments".These are compared with the section moment capacity.What...
  18. cecil123

    Book Reference on Design of Post Tensioned Floors

    Can anyone suggest me a good reference book which gives a number of examples (as well as concepts of course) for "Design of Post Tensioned Floors"
  19. cecil123

    PT Slab Question-ADAPT

    I was seeing the "ADAPT" PT Slab Totorial output report for a problem and found that one of the table for output includes: "Post- Tensioning Balancing Moments Shears and Reactions" Should'nt there be two tables like these i.e. one for transfer stage and one at service(wherein all long term...
  20. cecil123

    Post-Tensioned Floors

    Hello All: Just wondering with this question: I have being going through the tutorial problems in "ADAPT"(software for design of PT slabs). In one of the problems,the input specification states that, the minimum percentage of load to be balanced by post-tensioning is given as 25% of dead...

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