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Investigation of dynamic characteristics and vulnerability assessment of site and existing reinforced concrete building

Madun, Aziman and Kamarudin, Ahmad Fahmy (2013) Investigation of dynamic characteristics and vulnerability assessment of site and existing reinforced concrete building. Other thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Microtremor measurement is the most popular techniques in estimating the site and building responds as well as subsoil conditions due to non-destructive method, cheap but effective. It is suitable for a region which lacking of ground motions records but higher level of noise for dynamic characteristics investigation of a ground surface layer or structure. This research is canied out in order evaluate dynamic characteristics and resonance effect of low rise existing site and reinforced concrete building by using ambient vibration technique. Two sites have been selected in the study are, nameIy SMK Kundasang, Sabah (damaged building) and 0.4W radius of ground surfaces from SK Seri Sabak Uni in ft. Raja, Johor. Microtremor assessment conducted in SMK Kundasang on 3-storey existing reinforced concrete building and its site has led to the prediction of predominant natural frequencies 2.99 Hz to 3.10 Hz and 5.63 Hz to 5.85 Hz in the transverse direction with 4.85 Hz found in the longitudinal directions of the building. Observation of two modes of building frequencies made on the transverse FAS curves with the latter being attributed to the torsional mode induced by serious structural damage only on the East wing causing non-uniform displacements despite the building being regular and symmetrical in shape. There is only a slight difference between the predominant and fundamental frequencies of the building and ground. In this case, the resonance effect could be the main reason for the structural damage induced by previous earthquakes event. Although there were no microtremor data available prior to the reported damage, physical evidence of structural failures on the first floor level seems to support the occurrence of soil-structure resonance. For the next study area, 75 measurement points were measured for microzoning task. From the data analysis, it was found that the study area is located on soft soil based on natural frequency (Fo) values between 1 to 2 Hz and dominating single peak from most HVSR curves. It has also be determined the values of the seismic vulnerability index for ground (Kg) which ranging from 1 to 131. All microzonation maps have been presented in the contour layout in 2-D and 3-D model in N-S and E-W directions included for both sensors used. Both sensors 1 and sensor 2 used are quite comparable with some isolated region with different Fo, Ao and Kg values. Similar conclusion could be made within the directions of the North-South and East-West.

Item Type: Thesis (Other)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Depositing User: Normajihan Abd. Rahman
Date Deposited: 21 Apr 2016 05:14
Last Modified: 21 Apr 2016 05:14
URI: http://eprints.uthm.edu.my/id/eprint/7971
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