CONFIGURATION OF A MULTISTOREY BUILDING SUBJECTED TO LATERAL FORCES
ASHRAF M.*,SEDIGHI Z.A.,JAVED M.A.

* DEPARTMENT OF CIVIL ENGINEERING, UNIVERSITY OF ENGINEERING AND TECHNOLOGY, LAHORE, PAKISTAN


A study has been carried out to determine the optimum configuration of a multistory building by changing shear walls location. Four different cases of shear wall position for a 25 storey building have been analyzed as a space frame system using a standard package ETAB subjected to lateral and gravity loading in accordance with UBC provisions.
It is found that columns and beams forces are found to increase on grids opposite to the changing position of shear wall away from the centroid of the building. Twisting moments in members are observed to be having increasing trend with enhancement in the eccentricity between geometrical centroid of the building and shear wall position. Stresses in shear wall elements have more pronounced effect in elements parallel to displaced direction of shear wall as compared to those in perpendicular direction.
The lateral displacements of the building are uniform for a zero eccentricity case. On the contrary, the drift is more on grids on one side than that of the others in case of eccentric shear wall position. It is concluded that the shear wall should be placed at a point by coinciding center of gravity and centroid of the building.


Keyword: SHEAR WALL, LATERAL LOADING, ECCENTRICITY, DRIFT, FORCES, STRESSES
ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) 2008; 9(5):525-537.

http://sid.ir/en/VEWSSID/J_pdf/103820080503.pdf

WAVELET ANALYSIS FOR PROCESSING OF EARTHQUAKE RECORDS

HEYDARI A.*,SALAJEGHEH E.

* UNIVERSITY OF SHAHREKORD, SHAHREKORD, IRAN


Wavelet analysis is a new mathematical technique and in the recent years enormous interest in application of engineering has been observed. This new technique is particularly suitable for non-stationary processes as in contrast to the Fourier transform. The wavelet transform allows exceptional localization, both in time and frequency domains. The application of the wavelet transform to earthquake engineering is rare. In this paper the wavelet transform capability to give a full time–frequency representation of the earthquake record is demonstrated. In this method, the time series of the earthquake record, breaking at the tropical coral reefs and mechanically generated waves in the wave flume demonstrates the ability of the wavelet transform technique to detect a complex variability of these signals in the time–frequency domain. Various spectral representations resulting from the wavelet transform are discussed and their application for earthquake record is shown.


Keyword: TIME HISTORY, FREQUENCY LOCALIZATION, WAVELET TRANSFORM, FOURIER TRANSFORM


ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) 2008; 9(5):513-524.

http://sid.ir/en/VEWSSID/J_pdf/103820080505.pdf