NEHRP Clearinghouse
- Title
- Non-Linear Dynamic Response and Ductility Requirements of Building Structures Subjected to Earthquakes. Optimum Seismic Protection and Building Damage Statistics, Report Number 3.
- File
- PB296886.pdf
- Author(s)
- Anagnostopoulos, S. A.
- Source
- National Science Foundation, Washington, DC. Applied Science and Research Applications., September 1972, 312 p.
- Identifying Number(s)
- ['STRUCTURES PUB-349', 'R72-54']
- Abstract
- The dynamic response of single and multi-degree of freedom systems under earthquake excitation is studied. Some new models that include stiffness and/or strength degradation are introduced, and their response is compared with other frequently used models. Expressions are derived relating the natural period of simple systems (whose properties are estimated by using code procedures) to the required ductility factors for earthquakes of the El Centro intensity. Curves are obtained relating strength-motion intensity to the ductility requirements and are further used to obtain base shear coefficient laws for prespecified values of the ductility factor. A mathematical model, which combines shear and bending springs in three dimensions, is developed and implemented for studies of multi-degree of freedom systems. The formulation has included gravity loads and soil flexibility. Results obtained from the analysis of several buildings are presented and compared to those obtained by other investigators with more accurate models.
- Keywords
- Earthquake resistant structures; Mathematical models; Factor analysis; Dynamic response; Buildings; Earthquake engineering; Degrees of freedom; Soil structure interactions; Earthquakes; Dynamic structural analysis