Earthquake Ground Motions. I am quite new to earthquake engineering and was hoping someone could help me out. S00E). values, response spectra of El Centro earthquake (1940 05 18, comp. Chapter 2: Strong Motion and Estimation of Seismic Hazard; Chapter 3: Dynamics of Earthquake Analysis; Chapter 4: Response Spectrum Method; Chapter 5 : Response Analysis for Multi Support Earthquake Excitation ; Chapter 6 : Seismic Soil-Structure Interaction; Chapter 7: Non-linear Seismic Response of Structures … A displacement response spectrum is the plot of maximum displacement of a single degree of freedom system (SDOF) to a particular ground motion as a function of the natural frequency and damping ratio of the SDOF. Note the level in Figure 6 is somewhat higher that the corresponding VAFB level in Figure 2. 3. Dr. Hazim Dwairi 1940 El Centro, 0.35 g, N1940 El Centro, 0.35 g, N--SS Dr. Hazim DwairiDr. Keywords: Soil, Earthquake, Response spectra, Seismic analysis, Acceleration, Ordinary differential equation. Arch. SHOCK RESPONSE SPECTRA, Q=10 EL CENTRO EARTHQUAKE MAY 18, 1940 NORTH-SOUTH COMPONENT Figure 6. Hazim Dwairi The Hashemite University The Hashemite University Intro. Present code plots the response spectrum for the given seismic input. The Artificial earthquake record is defined by accelerograms which is compatible with a design spectrum and their response spectra will be equal to the target spectrum. earthquake (Clough 1962) or, based on the seismic history of an area, an acceleration spectrum envelope is developed for use in structural design. Touijrate And L. Bahi, The Seismic Motion Parameters Effects on Response Spectra: Comparison Between El Centro 1940 and Imperial Valley 1979 Earthquakes, International Journal of Civil Engineering and The El Centro earthquake occurred in United States of America on 18th May, 1940 with moment magnitude of 6.9 and Mercalli intensity scale. – Spectrum has a general trapezoidal Mcch., 39, 6, pp. Figure 2(b) shows the acceleration response spectra calculated for the El Centro 1940 earthquake for various damping values. Lecture 6 Lecture 6 –– Design Response Design Response Spectrum Dr Hazim Dwairi Dr. Hazim DwairiDr. ... El Centro , 1940, Record N S Comp. At this stage, I have plotted Acceleration v Time, Velocity v Time and Displacement v Time. To EQ Eng. Superpositon of Response Spectra The response spectrum for north-south component of El Centro ground motion for damping ratio = 0, 2, 5, and 10% is plotted together with the ground motion parameters ugo, u … – Response spectrum of an earthquake ver irreg larery irregular. 0 510 15 20 25 Time (s) 0.3 T = 3.0 s max 0.255 m Displacement Response Spectrum 0 0.3-0.3 0 03 T = 2.5 s 03 0 0.3-0.3 max 0.176 m T = 2.0 s max 0.274 m DISPLACEMENT SPECTRUM EL CENTRO RECORD Shock Response Spectrum The amplification factor for the curve in Figure 6 is Q=10, which is equivalent to a damping ratio of 0.05. Cite this Article M. Ahatri , K Baba,S. 589-603, Warszawa 1987 Horizontal-vertical response spectra for El Centro 1940 earthquake I. I. ORABI (NEW HAVEN) and G. AHMADI (POTSDAM) A SINGLE-DEGREE-OF-FREEDOM structure subjected to horizontal and vertical earthquake ground accelerations is considered. 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