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  • Users: kellez
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  1. kellez

    Inverted T-beam (Reinforced Concrete) Analysis and Design

    Hi everyone, I have already finished the design of a Reinforced Concrete ground floor house (108m2) but i want to replace one drop beam (250x500cm) with an inverted beam (600x350cm). What is the best way to carry out the analysis in Autodesk Robot? I have already replaced the existing beam in...
  2. kellez

    Steel Frame Connections - Specific connection type

    Hi everyone, what I want to do here is to start a general discussion regarding steel frame connections, real life stiffness of connections, how do you choose to model them for analysis, how you choose a certain type of connection over another and why. In order to start this topic, i am posting...
  3. kellez

    Steel Frame extension on existing RC Frame

    Hi everyone, 1) I want to design a 2-storey steel frame extension on an existing concrete frame. 2) The two beams that run parallel to the concrete beams will need to be anchored to the beams (to connect the two structures) 3) The floor will be a composite metal deck. 4) The composite floor...
  4. kellez

    Design of a portable metal frame (small studio)

    Hello everyone, I want to design and build a small studio 2.80x7.5m, made by steel frame that can be lifted by crane and transported by a trailer. I want the components to be from strong sections, not like the sections used to build the usual portal cabins. I have not yet decided on the type...
  5. kellez

    BEST BOOKS for Reinforced Concrete Project Site Supervision

    We are soon starting a new housing development out of Reinforced concrete frames, and i want to educated my self a bit more before we do start. do you know of any good books for site supervision from start to finish on concrete frames??
  6. kellez

    Correct lapping zone of Rc Columns in Seismic Areas

    I was very surprised today to learn from my new supervisor, a senior civil engineer that the correct lapping zone for RC columns is at mid-height of the column (where bending moments are lowest)and not at the bottom as i knew until today. To be honest, in my country Reinforced Concrete is the...
  7. kellez

    Seismic Design of Retaining wall - Do you apply vertical seismic action?

    Eurocode 8: Part 5 - 7.3.2.2(7) For non-gravity walls, the effects of vertical acceleration may be neglected for the retaining structure. So for any other type of retaining wall other than gravity walls vertical acceleration should be neglected. What do you guys think of this? what other codes...
  8. kellez

    Design of a 10m cantilever wall

    This is the design of a 10m cantilever wall which i was assigned to check and confirm. From my calculations i found that the wall is failing in sliding in the seismic loading. I want to take this step by step with you guys just to get your advice, since i am in a bit of a conflict with the...
  9. kellez

    Sand internal angle of friction - Retaining Wall Design

    So if i told you that the backfill material of a 10m retaining wall is compacted sand what would your first comment be? 1) water table is well below the wall foundation 2) rainwater will be drained but there will be cases where the sand will be damp not saturated but damp due to rainwater...
  10. kellez

    My main concern about EC8 is how do

    My main concern about EC8 is how do we apply the safety factors when designing a retaining wall for seismic loads. Its not clear in the code. There are 6 scenarios below, anyone knows which apply? 1) do we apply the same safety factors as we do in EC-7 and also add up the seismic action...
  11. kellez

    Earthquake Retaining Wall Design to EC8

    My main concern about EC8 is how do we apply the safety factors? 1) do we apply the same safety factors as we do in EC-7 and also add up the seismic action without a safety factor?? 2) do we apply the same safety factors as in EC-7 and also apply a safety factor to the seismic load 3) do we...
  12. kellez

    Retaining wall Design (Quick Question): Coulombs Theory

    Hi everyone, I am having a debate with another engineer and i want your thoughts. I am using Coulombs Theory to calculate the Total Active Pressure, Pa acting on the retaining wall shown in the picture. 1st step: calculate the coulombs active pressure coefficient, Ka which is 0.556 2nd step...
  13. kellez

    Design of RC WALL w/arch opening

    Hey everyone, I am designing an RC frame church with dimensions: Length = 7.0m Width = 4.40m Height = 5.30m 1. At the front and rear of the building i have cast in situ walls with arch openings. Below you can see the RC wall at the rear of the church. 2. The drawing below shows the...
  14. kellez

    Foundation beams design with Winkler springs - stiffness value???

    I am designing a one-storey RC house, the foundation is a raft foundation 45cm thick, with foundation beams (45cm height) (fully embedded inside the raft) interconnecting the frame columns. 1. The superstructure was designed with fully fixed supports at column bases but the foundation beams...
  15. kellez

    Reinforced Concrete Retaining Wall - Specifications for expansion joints?

    Hello everyone, i am designing a reinforced concrete retaining wall (please see details on the drawings below) and i would like to know what type of expansion joints do i need to use on the stem and at what spacing? 1) My main question now is, is it necessary to divide the wall into different...
  16. kellez

    Steel Rebar Grading between different standards

    Ok so i received these steel rebars today, but i am confused on the grade and strength of the bars, as you can see from the label, the bars are B450C according. to D.M. 14.01.2008 (Italy) but then below you can see another 6 standards with different grades. so what is the yield strength of the...
  17. kellez

    Structural engineer's fee for a whole new roof.

    Hello everyone, I am a young engineer and I have a question on how to charge fees for a project. The client aims at raising the roof height so that it can be used as living space. current roof height is about 1.5m and client wants to achieve a height of 2.8m. The project involves completely...
  18. kellez

    Guidance for the Design of a Reinforced Concrete Retaining Wall

    Hello everyone, please find attached a drawing of the retaining wall i am designing according to EC7 together with an excel file of my calculations. Its a cantilever L-shaped reinforced concrete wall comprised of a stem and foundation slab. Backfill soil is well graded gravel with unitweight =...
  19. kellez

    Angle of friction for backfill soils

    Hello everyone, I am designing a cantilever reinforced concrete retaining wall and I need to determine the angle of friction of backfill soil. Since this is not an insitu soil how am I supposed to determine the angle of friction of the backfilled soil since i am not able to get samples to carry...
  20. kellez

    RC Retaining Wall - concrete additives required?

    Hello everyone, I am designing a 3.5m high retaining wall of which 2.0m will be covered by infill soil. see picture attached I have specified a layer of bitumen felt to be applied on the wall up to 2.2m high. Next on top of the bitumen felt i have specified the installation of a geodrain...

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