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Seismic Vulnerability Evaluation of Axially Loaded Steel Built-Up Laced Members.
| 题名： | Seismic Vulnerability Evaluation of Axially Loaded Steel Built-Up Laced Members. |
| 作者： | BRUNEAU, M.; LEE, K. |
| 关键词： | *Truss-bridges; *Bracing-; *Seismic-studies.;Structural-members; Bridges-; Hysteresis-; Seismic-design; Literature-review; Compressive-strength; Design-; Stresses-; Strains-; Comparative-evaluations; Buckling-; Loads-Forces. |
| 摘要： | The research discussed in this report was performed within Project 094, Task 094-C-3.2, 'Seismic Performance of Steel Superstructures.' The objective of this research is to provide better knowledge on the seismic behavior of laced members, which can be broadly applicable to many steel truss bridges that share similar structural characteristics and details. Commonly encountered built-up brace details and configurations were collected from actual bridges that have laced members. Using this information, an experimental program was designed and conducted to investigate the hysteretic behavior of typical built-up compression members. Strength capacity of the specimens, obtained from the testing, was correlated with the predicted strength in the AISC LRFD Specifications. Assessments of hysteretic properties such as ductility capacity, energy dissipation capacity, and strength degradation after buckling of the specimen were performed. Nonlinear pushover analyses were also conducted and correlated with test results. The low cycle fatigue life of the specimens was quantified and compared with that predicted from models by other researchers. The observed cyclic inelastic behavior of the specimens showed that these latticed members can exhibit variable seismic performance and could often fail to meet the displacement demands for typical braced frames in seismic regions. |
| 报告类型： | 科技报告 |
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