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Dr. Erol Kalkan, P.E.


31 total contributions since 2016

I am a structural engineer. I earned my B.Sc. degree in Civil Engineering and M.Sc. degree in Engineering Seismology from the Middle East Technical University. My second M.Sc. degree in Structural Engineering is from the Bosporus (Bogazici) University in Turkey. My doctorate degree in Structural Engineering (major) and in Geotechnical Engineering (minor) is from the University of California, Davis. My postdoctoral studies were at the University of California, Berkeley.

I authored and co-authored more than 120 peer-reviewed publications on various issues in structural engineering and engineering seismology. My research and publications are at www.erolkalkan.com

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Submitted


Nonlinear multi-axial constant ductility spectra (H,V,tilt)
Robust function to generate multi-component constant-ductility nonlinear-inelastic response spectra.

18 days ago | 3 downloads |

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Answered
Finding the velocity from displacement
In regards to filtering the seismograms, I developed an automated algorithm: https://www.mathworks.com/matlabcentral/fileexchang...

2 months ago | 0

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An automated P-phase Arrival Time Picker with SNR output
PPHASEPICKER is a powerful tool for automatically picking P-phase onsets.

6 months ago | 18 downloads |

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spikeRemoval
This function replace or delete unwanted spikes (outliers) exceeding the threshold value using histogram method.

6 months ago | 10 downloads |

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smoothing function
smoothCurve offers various different window smoothing options.

7 months ago | 11 downloads |

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An Automated S-phase Arrival Time Picker with SNR Output
SPHASEPICKER is a powerful tool for automatically picking S-phase onsets.

7 months ago | 8 downloads |

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AUTODETECT BANDPASS FILTER CORNER FREQUENCIES
cornerFreqs automatically detects appropriate bandpass filter corner frequencies by comparing signal's spectrum with noise spect...

7 months ago | 14 downloads |

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Crop and save MatLAB figure as PDF (savePDF)
This simple function nicely crop the figure and save it as PDF

7 months ago | 7 downloads |

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inteFD
Computes integration of discrete time-signal in frequency domain

7 months ago | 12 downloads |

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diffFD
Computes derivative of discrete time-signal in frequency domain

7 months ago | 10 downloads |

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COMPUTE SMOOTH FOURIER AMPLITUDE SPECTRUM (smoothFAS)
This function computes Fourier amplitude spectrum and its smoothed version. For smoothing, it uses window averaging.

8 months ago | 6 downloads |

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SMOOTHING FUNCTION FOR FOURIER AMPLITUDE SPECTRUM
smoothSpectra offers different smoothing options for Fourier amplitude spectrum. Default window function is Konno-Ohmachi.

8 months ago | 11 downloads |

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Complex Mode Indicator Function (CMIF)
This is a robust complex mode indicator function, which can be used to identify Eigen values. A simple example is provided.

8 months ago | 4 downloads |

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Piecewise Cubic Spline Interpolation (from NUMERICAL RECIPES in C)
Piecewise Cubic Spline Interpolation (from NUMERICAL RECIPES in C)

1 year ago | 6 downloads |

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SPECTRAL WHITENING
This function applies whitening to a given signal within user defined frequency band.

2 years ago | 25 downloads |

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xcorrFD(x,y)
xcorrFD takes two discrete time signals as input and calculates cross-correlation and delay

2 years ago | 10 downloads |

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Frequency Response Function of Accelerometer (Oscillator)
This code computes frequency response function (FRF) of an accelerometer (SDF Oscillator)

2 years ago | 5 downloads |

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TIME-DOMAIN CROSS-CORRELATION FUNCTION
xcorrTD takes two discrete time signals as input and calculates cross-correlation and delay

2 years ago | 12 downloads |

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NONLINEAR-INELASTIC RESPONSE HISTORY ANALYSIS OF A SDOF OSCILLATOR USING OPENSEES
Fast MatLAB function for nonlinear-inelastic time-history analysis of a SDOF oscillator.

2 years ago | 9 downloads |

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Decimate (Downsample) A Signal in Frequency Domain
Frequency domain decimation function to reduce the sampling rate of a signal to a lower rate.

2 years ago | 5 downloads |

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Epoch & Unix Timestamp Converter (epoch2UTC)
Converts an epoch/unix timestamp into a human readable date

2 years ago | 7 downloads |

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NONLINEAR-INELASTIC MULTI-AXIAL TIME RESPONSE ANALYSIS OF SDOF OSCILLATOR
Robust MatLAB function for nonlinear-inelastic time-history analysis of SDOF oscillator

2 years ago | 4 downloads |

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Pseudo spectral acceleration, velocity and displacement spectra
This is a MatLAB function to compute linear-elastic damped response spectrum of time series

2 years ago | 11 downloads |

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Graizer-Kalkan (2015) Ground-Motion Prediction Equation
Graizer-Kalkan (2015) Ground-Motion Prediction Equation for earthquake strong motion estimates.

2 years ago | 8 downloads |

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Deconvolution of two discrete time signals in frequency domain
Compute deconvolution of two discrete time signals in frequency domain to study wave propagation.

2 years ago | 25 downloads |

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P-PHASE ARRIVAL TIME PICKER BASED ON AKAIKE INFORMATION CRITERION
Computes P-phase arrival time in windowed digital single-component seismic recording using AIC

3 years ago | 8 downloads |

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Time-domain Sinc Interpolation (Resampling)
Time-domain SINC resampling (interpolation) function with a simple example

3 years ago | 18 downloads |

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Frequency-domain Zero-padding Resampling (Interpolation)
Frequency domain (FFT-based) resampling of discrete-time signal

3 years ago | 7 downloads |

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Nonlinear-inelastic constant yield displacement response spectra
Compute nonlinear-inelastic constant yield displacement response spectra and input energy parameters

3 years ago | 2 downloads |

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ASCE 41-06 Displacement Coefficient Method
Displacement coefficient method of ASCE 41-06 based on FEMA 440

3 years ago | 2 downloads |

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