Abdelrahman Taha

11 Questions 26 Answers 0 Followers

Questions related from Abdelrahman Taha

Modeling of soil-structure interaction?

hi, I am trying to model a system taking into account the soil-structure interaction effects. And I have a question .. I've gone through NIST report on soil-structure interaction modeling, and I...

22 October 2020 2,237 3 View

I am looking for an earthquake with a range of the least possible num of frequencies?

Hi, I want to conduct seismic analysis using a seismic record with the least possible num of frequencies. So, any help by providing info about historical earthquakes that match this requirement...

21 February 2020 6,519 1 View

Record of mexico city 1985 earthquake?

I need the time history of Mexico city 1985 earthquake occurred on 19 September. I've been searching different databases including PEER, but I couldn't find it. So, any help would be appreciated.

31 July 2019 7,849 8 View

What's the difference, in term of the outcome, between not defining support conditions when solving structural dynamic and static problems?

I understand that when solving a static problem, the stiffness matrix is normally singular and that adding specific restraints is what yields a unique solution to the problem. But in dynamic...

20 December 2018 1,205 2 View

I need suggestions for new promising research topics in the field of earthquake engineering and structural dynamics

I'm going to do research in this field, so any contribution is appreciated.

06 August 2017 796 7 View

How accurate is the seismic design using response spectrum analysis of a very flexible structure that shows high level of geometric nonlinearity?

This structure is composed of both steel bars and cables. The existence of cables is required for the deployment of the structure from a fully-retracted state to a fully-deployed state. After the...

26 July 2017 1,612 5 View

I can't perform modal analysis using Ritz vectors in SAP2000?

Every time I try, it gives me this error "2 eigenvalues below the shift, Ritz analysis requires all eigenvalues to be above the shift". What can be the problem that makes this error exist?

15 July 2017 6,333 3 View

I need time histories of the vertical components of earhquakes

I want to study the dynamic behavior of some structures that are sensitive to seismic vertical loads. All what I found is the lateral ground motions, but I couldn't find any time histories of the...

12 July 2017 6,086 3 View

I have an error when running the analysis of a structure that consists of steel bars and cables using SAP2000 .. What does that error mean?

The 1st image shows the structure, the steel bars are colored in yellow, and the cables are colored in green. And the 2nd one shows the error.

25 March 2017 7,192 6 View

When performing nonlinear buckling analysis in a FEM software like SAP2000, what does it mean to obtain negative eigenvalues? is the system unstable?

After the analysis is over, i noticed warning within the analysis output file that the structure is unstable or ill-conditioned and that "number of negative stiffness eigenvalues should be zero...

11 November 2016 7,855 9 View

IF a strut is attached to a joint and a cable passes through the same joint as if it is a pulley. how to model this joint in SAP2000?

The system I am working on is a cable-strut flat grid system like that shown in the figure. The upper inclined cables are used as "active cables". Those cables are supported along the boundaries...

25 October 2016 9,665 9 View