Suggested Changes to the non- conservative low frequency criteria for the seismic design spectrum used in intraplate regions John Nichols Department of.

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Presentation transcript:

Suggested Changes to the non- conservative low frequency criteria for the seismic design spectrum used in intraplate regions John Nichols Department of Construction Science Texas A&M University College Station, TX

Presentation ► Historical Background ► Issues with collapses in earthquakes ► Earthquakes of Interest ► Mathematics and Pulses ► Findings and Comments ► Conclusions

Historical Background ► Design Spectrum developed from California and Japanese earthquake data ► Housners’ papers in the 1950’s ► Veletsos and Newmark in the 1960’s ► Newmark and Hall in the 1980’s ► Kim at Lamont in 2001

Collapse Events - Issues Collapse of Historic Wall in Ahmedabad, India, during the 2001 Gujarat Earthquake. Collapse of the Italian School – 2002 – 24 deaths

Significant Earthquakes

Nahanni Time Trace – M6.8

Nahanni Fast Fourier Transform

Nahanni Phase Angle Rotation

Developments in Spectrum

Features of the Plot ► The first observation that can be made from the data plotted on Figure 5 is the gradual increase in the maximum design velocity expected from earthquakes from Richter in 1958 to the ASCE in 2003.

Spectrum Shape Features ► The second interesting feature is the relative stability of the upper corner frequency on the design spectrum at about 1.6 to 2 Hertz.

Newmark and Hall ► Newmark and Hall’s (1978, 49) observation on the shape of some earthquake spectra is reviewed in this paper. However the critical third observation is that there is no physically based mathematics that requires this tent shape to be the limiting criteria for all earthquakes and the bandwidth criteria of for the maximum values in an earthquake is only approximately correct.

Newmark and Hall Bandwidth ► Criteria for Bandwidth not necessarily met in large events

Code Selection Features

System Definition

Equations Convolution Integral Solution

Brune Spectra’s

Significant Earthquake Events

Additional Events - Pulses

Findings and Comments ► Issues of the Peak ► Issues at 1.7 Hz. ► Fault Length – Brune Spectra ► Intraplate Features – Pulses ► Harmonics

Conclusions ► Low Frequency 0 – 10 Hz ► High Frequency 10+ Hz ► Spectrum Changes ► Pulse Issues