Measuring the Dynamic Amplification Portion of Natural Torsion Based on the 3d-Sam Method and Sensing Tests
Abstract eng: 16 low to mid-rise irregular buildings located in Montreal, Canada have been tested under ambient vibrations and are analyzed with a novel three-dimensional seismic assessment method (3D-SAM) and software directly based on ambient vibration records. This method performs time-history analysis of the buildings based on their modal properties extracted from sensing tests and input earthquakes without creating a finite element model. Results of this analysis are response histories of resultant forces and twisting moments on each floor. With these results, the dynamic amplification portion of natural torsion of the dataset is calculated and discussed in the paper. The mean value and mean plus one standard deviation of the equivalent measured eccentricities that can represent the dynamic torque acting at the floor centre of mass were shown to be almost 12% and 18% of the plan dimension perpendicular to the direction of the seismic loading, respectively, for the whole database. The proposed methodology is appropriate for large scale assessments of existing buildings, and is applicable to any seismic region of the world. The authors suggest using the same procedure for other cities with different seismicity, to get an estimate range of the dynamic amplification portion of natural torsion of real buildings.
Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.
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Record created 2017-01-18, last modified 2017-01-18
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