Elastic-plastic analysis of multi-story frames using an elastic-viscoplastic model | |
| Author | Chang, Fu-tsan |
| Call Number | AIT Thesis no. ST-79-06 |
| Subject(s) | Structural frames--Testing Structural dynamics |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | A finite element formulation is presented for the analysis of elastic perfectly plastic plane frames undergoing small deformations, using an elastic-viscoplastic model. Incorporated in the formulation are the modal coordinate transformation technique for solving dynamic problems and a sub structuring scheme for static analyses, which avoids the need to modify the transformation relation between the internal and boundary degrees of freedom of each substructure during yielding. The Newmark average acceleration scheme is used in solving the incremental equations of motion. An implicit second order Runge-Kutta method together with the Newton-Raphson technique and a local time step sub-incrementing procedure are employed in solving the non linear constitutive equations. Numerical Examples given show that accurate results can be obtained with a few lower modes included in dynamic analyses. Stable results are obtained even with large time steps. Finally, the formulation with sub structuring gives almost the same result as the direct formulation in static analyses, and static collapse loads can be predicted with practical accuracy. A criterion for obtaining the static collapse load is also proposed. |
| Year | 1979 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Worsak Kanok-Nukulchai ; Panitan Lukkunaprasit |
| Examination Committee(s) | Karasudhi, Pisidhi |
| Scholarship Donor(s) | China Technical Consultants, Inc. |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1979 |