4.Site Predominant Period场地卓越周期 Earthquake wave is influenced with soil profile Active faults nearby, Regional geology influenc sidence(下陷性地震) 2015y10w20 几大生大 30151020 4.Site Predominant Period,Ta To emress site characteristics and the distance to epicanter Based on Chinese Seismic Code (0012010). Site Predominant oup 025.0.350.450.65 @ 3.4 Response Spectrum of SDOF 3.5 Response of Nonlinear SDOF Systems (* Response spectra are very useful tools 1 Nonlinearity of Materia If we know a singie story building's natural period,and the 2.Motion Equations of SDOF Nonlinear ding const n ste,we can find the s System(K e the the Nonlinear Motion Equations 4.Hystorosis(回)Model If we can resolve a MDOF to a family of equivalent SDOF skeletor system,then we canc e multi-story buldng's Eq.loads using 大4 4. Site Predominant Period 场地卓越周期 Tg 2015/10/20 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 19 Earthquake wave is influenced with soil profile: • Active faults nearby, • Soil dynamic response • Regional geology influence • Liquefaction • Landslide • Subsidence (下陷性地震) 2015/10/20 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 20 Site Category Site Group I II III IV Group 1 0.25 0.35 0.45 0.65 Group 2 0.30 0.40 0.55 0.75 Group 3 0.35 0.45 0.65 0.90 Site Predominant Period Tg （s） 4. Site Predominant Period, Tg To express site characteristics and the distance to epicanter, It is divided to three groups, Group 1 to 3 for near-earthquake (近震) to far-earthquake （远震）. Based on Chinese Seismic Code (GB 50011-2010), 2015/10/20 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 21    0.3 6 0.05 0.9       4 32 0.05 1 0.02     ς    0.08 1.6 0.05 2 1     Attenuation index number declined slope coefficient Damping adjusting coefficient • Response spectra are very useful tools If we know a single story building’s natural period, and the building construction site, we can find the seismic effective coefficient to determine the equivalent static force (earthquake load), the we can combine the Eq. load with other loads. Then we can check the system if it meets the requirements. If we can resolve a MDOF to a family of equivalent SDOF system, then we can calculate multi-story building’s Eq. loads using Response Spectra of SDOF. 3.4 Response Spectrum of SDOF 2015/10/20 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 23 1. Nonlinearity of Materials 2. Motion Equations of SDOF Nonlinear System (K(t)) 3. Solutions of Nonlinear Motion Equations 4. Hysteresis (滞回) Model ( ; skeleton curve （骨架曲线） and hysteretic curve （滞回曲线）)   ,M ,F  3.5 Response of Nonlinear SDOF Systems （*）