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  1. Alireza1945

    Finite difference scheme for unconfined aquifer equation ?

    For an unconfined aquifer , we have this pde for the water table position , of course after making the Boussinesq somehow linear : ∂²(h²)∕∂x² + ∂²(h²)∕∂y² = (2s/k ) ∂h/∂t - 2N/k N and K and S are constants . would u tell me what type mathematically it is ? this equation , in respect to h^2...
  2. Alireza1945

    Show Table , Etabs 2015

    I have a problem with Show Table command in Etabs 2015 , it is not like older versions for me... i mean i cant find the option for show table....like we could choose load combos and selection only and .... where is it in Etabs 2015 ? help me out guys ~
  3. Alireza1945

    a case in calculation of lateral stiffness !!

    I have posted same problem in Seismology department here , but i think i explained in a not clear way , i got no reply ,, well , the problem is , i am calculating lateral stiffness for frames , steel frames , and to reach story lateral stiffness and CR point . problem is , i have an oblique...
  4. Alireza1945

    Rigidity of an oblique frame

    For calculating the center of rigidity of a floor system , i know that i have to first find the rigidity of frames in horizontal and vertical direction , but now i am confronted with something that im not capable to understand and calculate , i will attach the columns plan here in this post ...
  5. Alireza1945

    Center of Mass

    I know it seems very elementary , but i have problem and doubts , well i want to know , when im going to calculate center of mass in each floor , without any software , should i calculate the weight of walls ? walls at perimeter and partitions ? and what about that half of the height of walls...
  6. Alireza1945

    Shell Structures

    Hey guys , i need some resources and information about shell structures , i wanna know how they make it really , which material they use , how they erect those type of structures , ... where do u suggest i look it up for ..?
  7. Alireza1945

    Columns in Plan

    is it any special guide or point for positioning the columns in a plan ? i mean , when i get the plan from an architect , after it , i have to place the columns in the very first place , any guide for doing it the best way ? is there any best way or it is based on engineering experiences ?!
  8. Alireza1945

    def of center of resistance ,

    could anyone help me with the definition of the center of the resistance in a building or anywhere ) and the difference between this and center of stiffness , im really in need of knowing it , tnx for your help )
  9. Alireza1945

    Pore water pressure

    I was calculating lateral earth pressure at rest for a submerged or actually partially submerged soil. with a surcharge q for instance. and i dont understand why this surcharge does not add to pore water pressure , and we only add it to effective stress. is it the same when water table is at...
  10. Alireza1945

    Subsurface Exploration

    I wanted to know why we dont correct SPT number due to overburden pressure in cohesive soil . Is it because of Phi=0 concept ? Im really stucked here. Tnx in advance.

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