Probabilistic Methods to Identify Seismically Hazardous Older- Type Concrete Frame Buildings

摘要: Author(s): Galanis, Panagiotis | Advisor(s): Moehle, Jack P. Abstract: Earthquakes that have occurred recently across the globe in various countries including United States, Japan, New Zealand, Haiti, Turkey and Italy brought into light poor seismic performance of older-type, non-ductile concrete buildings. These buildings, mainly designed constructed prior to 1980s, lack proper detailing may pose an unacceptably high risk. Non-ductile buildings one greatest safety problems world due large amount old earthquake prone regions. It is indicative according Concrete Coalition California inventory project there are 16,000-17,000 these risk counties California. Many occupancies, residential, commercial critical services. In case a severe earthquake, damage or even collapse could occur result number casualties. While engineers generally recognize proactive steps required address posed by mitigation efforts largely stymied insufficient knowledge about scale problem, tools identify truly dangerous costs strengthening, owner resistance pay for strengthening with uncertain benefits. This study constitutes effort seismically hazardous frame through simplified methods do not require complicated analysis. Three idealized different heights used as archetypes. The attempts link structural deficiencies appear commonly older construction practice. To evaluate non-linear dynamic analysis several far-fault ground motions performed. considers nonlinearities associated flexural yielding, shear axial failure. main explored development weak story mechanisms strong column-weak beam designs, brittle failure modes inadequate column reinforcement detailing, splicing connectivity weaknesses between members. results indicate suggested can be assess older-type developed current use simple engineering parameters such column-to-beam strength ratio estimate type A probabilistic approach takes account record-to-record variability accommodate well uncertainty properties modeling. Chapter 7 proposed methodology evaluated applying it three developed. estimated probabilities calculated each compared values provided sophisticated analyses. suggest successfully identifies leading potential provides effective tool classifying