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  1. abdallah hamdan

    Massive Reinforecment Steel For connected /complex shape footings

    I have a strip footing with dimensions 2 meters wide by 5 meters long, located under a basement wall. This footing is connected to another strip footing that is 1 meter wide. Both footings have a depth of 50 cm. The variation in width is due to the wall loads , one part of the wall will continue...
  2. abdallah hamdan

    Combined Footing Design

    I was designing a Combined Footing for columns that are close to each other, and the columns are not at the same horizontal and vertical level, as shown When I studied another appropriate shapes for the foundation, I found that the following shape require less area and smaller thickness ...
  3. abdallah hamdan

    how to increase footing thickness?

    Hello everyone, I have a Footing that was poured at 55 cm thickness, 15 cm lower than required (70 cm), punching shear failure will occur, How is it possible to increase the thickness of the footing? note that the footing was poured recently, and no work has been done on the column necks any...
  4. abdallah hamdan

    Structural design of staircase with split between steps

    I want to design a staircase with a split between the staircase steps, shown in the attachments (step number 6), Do you have any ideas or any explanation of how to model and design such a staircase? thanks in advance.
  5. abdallah hamdan

    design a step wall footing

    During the excavation process for a new building consisting of 6 floors, a footing was found at a level other than all the bases due to the presence of swollen soil that was removed under it, the rock layer has been reached. the footing for the retaining wall that connects two separate footings...
  6. abdallah hamdan

    torsional irregularity and eccentricity checks for structure with basement wall

    hello everyone, I'm making a torsional irregularity and eccentricity checks in a building with retaining-basement walls, when I model these walls, which are existed on the basement floor and ground floor, the building will have extreme torsional irregularity and eccentricity of more than 15%...
  7. abdallah hamdan

    seismic design used period and extreme torsional irregularity in a residential building

    while designing a 7-story residential building, Etabs calculated the fundamental period as 1.85, and the approximated Period Ta was 0.53, the building is located in seismic zone 2B with Z=0.2g, and the period used for calculating base shear was 1.4 Ta which is 0.74, isn't the used period far...
  8. abdallah hamdan

    Searching to find best way to design footings

    I have a quesion about proper model, analyze and design using etabs , i have no clear way to assign partial fixity for column and shear wall base , according to BS 5950 , which shown in the figure , it depents on the rigidity of the connection between member and footing , and found no way to...
  9. abdallah hamdan

    base joints modeling for RCC structures

    while training to design a 10-story building, I asked many engineers about base joints for columns and shear walls, some said that joints considered as pinned are safe and more economic, but, in my opinion, the lateral load will cause a moment at the base that I should design for, any ideas...
  10. abdallah hamdan

    fixed and pinned supports

    if I have a beam with pin supports (columns) as in fig (1) Is having a weight P due to the existence of upper floors on the beam sides as in fig 2, lead the beam to act as there is fixed support on both ends?
  11. abdallah hamdan

    Structural modeling - Base Level joint

    As stated in section 12.7.1 in ASCE 7-16, "Foundation Modeling. For purposes of determining seismic loads, it is permitted to consider the structure to be fixed at the base. Alternatively, where foundation flexibility is considered, it shall be in accordance with Section 12.13.3 or Chapter 19."...
  12. abdallah hamdan

    Property modifiers for slab/shell thin design

    as stated on the (ACI 318.2-14):3.1.1) "Elastic behavior shall be an acceptable basis for determining internal forces and displacements of thin shells. This behavior shall be permitted to be established by calculations based on an analysis of the uncracked concrete structure in which the...
  13. abdallah hamdan

    Column-Isolated Footing joint

    If I consider that the Column-Isolated Footing joint is pinned what are the requirements or details needed to correctly represent the pinned joint in the structure?

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