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Recent content by boricuastructural

  1. boricuastructural

    Pulley diameter

    the pulley is just changing the direction of the cable. is going to be fixed t0 the floor.
  2. boricuastructural

    Pulley diameter

    How do I calculate the diameter of a pulley for a given tension in a cable? My force is 20 kips.
  3. boricuastructural

    Underground Concrete Tank

    Im designing for the first time a water cistern. Its going to be 10 ft underground, ist 20ft by 12 ft and its going to contain 10,000 gals. My question is about the foundation, does the ground slab provides the foundation for the cistern walls or it needs independent footings?
  4. boricuastructural

    Pinned top??

    The soil is on the full height. What do you mean by thrust? (Sorry but english is my second language). The existing structure is approx. 100' by 45' 3 story RC structure, and it has shear walls in both directions for seismic and gravity loads (im in a seismic zone). The addition is going to be a...
  5. boricuastructural

    Pinned top??

    The structure is an addtion to an existing structure. Its kind of a balcony. At the end of the existing structure there is a frame of rc columns and a beam and 8 ft apart is going to be the retaining wall. The 6 in slab is going to be supported by the frame of columns at one end and the...
  6. boricuastructural

    Pinned top??

    I have a retaining wall that Im also using as vertical support for a 8ft - 6in slab. Then, can I assume a pinned top for the wall?
  7. boricuastructural

    Joint Information

    Ok. You are right. I am in a seismic zone. This is a structural slab conventionally reinforced. The length of the old structure is 160 ft by 21 ft. The new addition is going to be 14 ft by the 160 ft of the old structure. I want to make them independent and avoid pounding effects.
  8. boricuastructural

    Joint Information

    I want to design an expansion to an existing building but I want it to make it independent of the existing structure. What kind of joint should I use between the old and new slab?
  9. boricuastructural

    Grade Beam

    Thats when you have two footings. I have a series of columns lets say in the x dir and the property line is on the y dir. I dont have a column on the y dir to tie the columns in a combined footing. Thats why I have been advised to tie the columns together in the x dir.
  10. boricuastructural

    Grade Beam

    I have to desgin an eccentric footing on the property line of my building. One of the suggestions for the design was to tie the footings together using a grade beam. Where does it tie them together? At the base of each columns? Or tying the foundations together at he base of each foundation?
  11. boricuastructural

    Eccentric footing

    I have a line of columns on the property line which doesnt allow me to do concentric pad footings. The design wil have to deal with zero length on the side of the property line. I've read about using a combined footing but I dont have another column to do this. I also read about using a...
  12. boricuastructural

    Four sided concrete roof

    csd72, Yes. It is done in Puerto Rico where I live.
  13. boricuastructural

    Four sided concrete roof

    I have consulted and researched this and found different ways to specify the steel. I have seen one that I can not understand. It has steel in both directions with standards hooks at the end and also the temp reinforcement. It is the same as placing the regular reinforcement with dowels?
  14. boricuastructural

    Four sided concrete roof

    Thanks.
  15. boricuastructural

    Four sided concrete roof

    Its a roof that slopes in four directions. They are very effective for wind pressures. It like a gabled roof but in two directions.
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