Dynamic characteristics and seismic performance evaluation of low rise existing RC moment resisting frame using microtremor technique and standard code of practice
Most of existing multi-storey reinforced concrete (RC) buildings in Malaysia was designed to BS 8110 without considering seismic load. Tremors generated from previous distant earthquakes occurred from Sumatran faults zone had shaken many low-rise to high-rise buildings in Peninsular Malaysia and eme...
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4510/ http://eprints.uthm.edu.my/4510/1/MINEC%2D24.pdf |
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| Summary: | Most of existing multi-storey reinforced concrete (RC) buildings in Malaysia was designed to BS
8110 without considering seismic load. Tremors generated from previous distant earthquakes occurred from
Sumatran faults zone had shaken many low-rise to high-rise buildings in Peninsular Malaysia and emerged
panic. Worst scenario when the conventional practice of unreinforced masonry like brick wall is weak in lateral
resistance and ease to damage. Poor soil condition may also have a crucial modifying influence occasionally
acted as a resonator and amplifies the seismic wave when reached to ground surface. A microtremor study was
conducted in order to evaluate the dynamic characteristics of site-structure, resonance potential and seismic
capacity of an existing 4-storey RC primary school building and its site in SK Sri Molek which located in Batu
Pahat-Johor. From the findings, it was expected that the building is prone to resonate since both site and
building have only a slight different between their natural frequencies. The predominant building frequencies
were predicted at 4.20 Hz and 4.35 Hz in transverse and longitudinal directions whereas for site fundamental
frequencies were between 2.69 to 3.20 Hz in North-South (NS) direction and 2.79 to 2.98 Hz in East-West
(EW) direction. By using the site response spectra for Kuala Lumpur region based on the consideration of large
magnitude of distant earthquake scenario at 9.3 and 530 km of the closest to site distance produced by previous
researcher, the design response spectrum (RSA) has given 0.32 m/s2 at natural period between 0.15 to 0.40 s.
From this RSA value, an equivalent static analysis (ESA) for base shear force estimation was performed
according to EC 8 [2]. The analysis shows that, the design ultimate horizontal load described in BS 8110 [3]
based on conventional load combination has been exceeded more than 1.5% as recommended by the code. |
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