Recent content by Zouatine

hello everyone! i have some problem in solution of this problem should i transfert the vertical stree to the horizontal stress and solve it ? problem : The equivalent static stiffness of the soil as an infinite elastic half-space under an infinite strip foundation is given in the vertical...

when i solved simple example about 2 height stories when we have 2 degree of freedom I’m confusing about the meaning of result of eigenvectors and eigenvalues . This is the example i'm getting 4 eigenvalues and 4 eigen vectors . as following I didn’t understand we have 2 MDOF and we are...

hello , hope all of you are doing well , i have question about the unit of the function of waves of string fixed in both boundary , the function of waves is function of two variables x and t , so it's function describe the displacement in function of place and time , Ψ(x,t)=φ(x)*sin(ωt+α)...

hello , thank you for your comment , sorry i made a mistake , i want to say external work , External Work= Work has done by the External Forces , Thanks and sorry again ,

hi thank you for your comment! ,no it's not , solution of the exercise i already know it , i said i have to use Energy method , which mean the first step to solve it : Total Energy = Internal Energy + External Energy , Internal Energy is the energy in the Spring , and for External Energy is...

Hi! hope you are doing well , I'm trying to solve this problem ( mechanical problem) about structure with load F as it showing in the next figure , i want to determine to critical force F , the stability force ( which means if my load is bigger than the critical load my system will be unstable)...

Hi! i have this exercise and solution : Exercise: steel plate given in figure (a) is joined by an inclined butt weld ,the plate is subjected to tensile stresses in both x and y directions, σ(x)=54 N/mm^2 and σ(y)=38 N/mm^2 , 1) Determine the normal and shear stresses of the butt weld...

My problem: In the solution,our teacher found, that the wet section is minimal if y=L/2 So Am: = L^2 /2; Pm: = 2L; So despite that I try with any value, I can not find a more minimal section, and that's not the case because if I try with y = L / 3 I find Am: L^2/3; Pm: (5/3)*L ; and these...

Hi every one , I have this question today : The two arrows in the figure show two thermodynamic processes of a certain amount of ideal gas. The dashed line is a hyperbola. Which of the following statements is not true? a. The heat transfer is the same in the two processes. b. The temperature...

hello everyone 1. Homework Statement Problem: An AB beam, loaded with a distributed load q (KN/m), the length of the beam is 2 m. EI=constant find the reactions in the beam ,we use y''=-(1/EI) *M(x) Homework Equations y''=-(1/EI) *M(x)[/B] The Attempt at a Solution first we have 6 reactions...

thanx , Sir

Sorry. My english is not good my question was how you found this : d(M^2)/df =2M* dM/df

thanx, so to find dM/df , I choose Ra so, 1- dM/dRa =-x 2- dM/dRa =-x and after that du/dRa=(1/EI)*∫(-x*Ra)*(-x) dx+(1/EI)*∫(-x*Ra+Rb*(x-L)-(qL/2)*(x-L)^2)*(-x) dx =0 with (0<x<L) and in second (L<x<2L). and I find Ra in this equation, just one more question about this...

First thanks for your answer Sir , I made a mistake ∑F=0→ -Ra+Rb+Rc=ql - the positive sense for the moment is the clockwise. yes I know to get energy I have to integrate (M^2/(2EI)).dx , but it's complicated to integrate from 0 to L M^2/(2EI);dx with (M(x)=-Ra*x and from L to 2L M^2/(2EI) with...

Homework Statement Problem: a continuous beam ABC simply presses, loaded with a distributed load q, the length of the beam is 2L. EI=constant find the reactions in the beam ,we use Castigiliano method. Homework Equations - U=(1/2EI)∫M^2 dx (U: Energy) - dU/dP=d (d: displacement) The...