Selecting and Scaling of Real Accelerograms to Reduce the Scatter in Dynamic Response

One of the major objectives in ground-motion scaling techniques is to reduce the dispersion (bias) in structural response. The current scaling techniques generally modify the amplitude of each record in a bin to a target peak ground motion value. Although these approaches are proved to be efficient for obtaining suits of scaled records that would yield lower dispersion in spectral demand parameters, they do not warrant any physical basis. This study not only focuses on reducing the scatter in structural response, but also emphasizes the significance of preserving basic seismological features of the records after being scaled. Consequently, the limitations of an alternative scaling methodology are investigated by comparing the results from the conventional procedure described above. The explored methodology uses ground motion prediction equations (GMPEs) and scales each record with known fundamental seismological parameters (i.e. magnitude, distance and site class) by using the estimations obtained from the chosen predictive model. The procedure uses the standard deviation of the chosen GMPE to incorporate the aleatory variability to the entire process. We compiled a ground-motion dataset from Turkish, PEER-NGA and European strong-motion databanks and conducted spectral analyses to compare the efficiency of these two methods in reducing the uncertainty in structural response. The comparative statistics are presented for elastic and constant strength spectral displacements for vibration periods of 0.3s, 0.6s, 0.9s, 1.2s, and 1.5s.
9th US National and 10th Canadian Conference on Earthquake Engineering (25 - 29 Temmuz 2010)


A method for robust design of products or processes with categorical response
Erdural, Serkan; Köksal, Gülser; Department of Industrial Engineering (2006)
In industrial processes decreasing variation is very important while achieving the targets. For manufacturers, finding out optimal settings of product and process parameters that are capable of producing desired results under great conditions is crucial. In most cases, the quality response is measured on a continuous scale. However, in some cases, the desired quality response may be qualitative (categorical). There are many effective methods to design robust products/process through industrial experimentati...
Controller design and implementation for a guidance kit used at spinning rockets and projectiles
Günay, Görkem; Balkan, Raif Tuna; Çalışkan, Hakan; Department of Mechanical Engineering (2022-4-28)
Traditional spin-stabilized projectiles have disadvantages due to low accuracy and precision with respect to guided munitions. There are two main solutions to eliminate these disadvantages. The first one uses a drag brake mechanism to make 1-D guidance by making range correction. The second solution makes 2-D guidance. Since rotation dynamics of a spin-stabilized projectile is faster than existing servo actuators this solution requires isolation of the guidance kit from the rotation of the projectile body. ...
Characteristic Mode Analysis of Reflectarray Unit Cell
Haykır, Yiğit; Aydın Çivi, Hatice Özlem (2018-12-10)
In this work, characteristic mode analysis for unit cells of metal-only periodic structures such as reflectarrays, transmitarrays and frequency selective surfaces (FSS) is presented. Ewald’s representation of three dimensional (3-D) Green’s function for two dimensional (2-D) periodicity is utilized within the Method of Moment (MoM) analysis. Modal characteristics of reflectarray antennas are investigated. Relation between characteristic modes and the reflection coefficients for reflectarray antennas is disc...
A calixpyridinium-pyranine complex as a selective anion sensing assembly via the indicator displacement strategy
Atilgan, S; Akkaya, EU (Elsevier BV, 2004-12-06)
The recently reported calixpyridinium tetracation is shown to be very well-suited for anion sensing via the indicator displacement strategy. A very strong binding interaction between the positively charged receptor and the fluorescent pH indicator pyranine (8-hydroxy-1,3,6-pyrenetrisulfonate) requires an anionic guest of comparable negative charge for effective indicator displacement. Thus, selective and sensitive signalling of ATP is achieved in aqueous solutions.
A Knowledge based approach in GMTI for the estimation of the clutter covariance matrix in space time adaptive processing
Anadol, Erman; Tanık, Yalçın; Department of Electrical and Electronics Engineering (2012)
Ground Moving Target Indication (GMTI) operation relies on clutter suppression techniques for the detection of slow moving ground targets in the presence of strong radar returns from the ground. Space Time Adaptive Processing (STAP) techniques provide a means to achieve this goal by adaptively forming the clutter suppression filter, whose parameters are obtained using an estimated covariance matrix of the clutter data. Therefore, the performance of the GMTI operation is directly a ected by the performance o...
Citation Formats
B. Ö. Ay, “Selecting and Scaling of Real Accelerograms to Reduce the Scatter in Dynamic Response,” presented at the 9th US National and 10th Canadian Conference on Earthquake Engineering (25 - 29 Temmuz 2010), Toronto, Kanada, 2010, Accessed: 00, 2021. [Online]. Available: