Dalam kejuruteraan seismik, halaju gelombang ricih (Vs) adalah salah satu parameter yang paling penting bagi mikrozonisasi seismik dan penilaian struktur ke atas bangunan dengan pertimbangan interaksi tanah struktur (SSI). Kajian ini memberi tumpuan kepada mikrozonisasi seismik tanah tempatan dan menilai kesannya terhadap rekaan empangan bukan seismik. Kajian Analisis Pelbagai Saluran Gelombang Permukaan (MASW) telah dijalankan di tiga lokasi di kawasan empangan Chenderoh dalam penentuan tindak balas seismik tanah tempatan. Hasil MASW menunjukkan bahawa tanah di empangan Chenderoh boleh dikategorikan kepada Kelas B (tanah yang sangat padat) menurut Eurocode 8. Dua jenis keadaan sokongan dipertimbangkan dalam analisis ini iaitu sokongan tetap dan sokongan spring. Peratusan beza anjakan puncak antara sokongan tetap dan sokongan spring adalah 9.17% yang membuktikan bahawa ciri-ciri sokongan spring adalah lebih fleksibel daripada sokongan tetap di mana cenderung untuk menjadi tegar. Keputusan Analisis Dinamik Tambahan (IDA) menunjukkan bahawa anjakan puncak untuk model sokongan spring adalah lebih tinggi daripada model sokongan tetap. Anjakan puncak tertinggi empangan tersebut berada pada PGA of 1.2g yang 1.712mm bagi keadaan sokongan tetap dan 1.885mm bagi keadaan sokongan spring.
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In seismic engineering, shear wave velocity (Vs) is one of the most important parameter for seismic microzonation and structural evaluation on the buildings with consideration of soil structure interaction (SSI). This study is focuses on the seismic microzonation of local soil and evaluates its effects on non-seismic designed dam. Multichannel Analysis of Surface Waves (MASW) surveys are carried out at three locations in Chenderoh dam area in the determination of seismic response of the local soil. The MASW result shows that the foundation of Chenderoh dam can be categorized into Class B (very dense soil) according to Eurocode 8. Two types of support conditions are considered in the structural analysis which are fixed and spring support condition. The percentage different in crest displacement of fixed and spring support is 9.17% which proved that the characteristic of spring support is more flexible than fixed support where tends to be rigid. Incremental Dynamic Analysis (IDA) results found that crest displacement for spring support model is higher than fixed support model. The highest crest displacement of the dam is at PGA of 1.2g which is 1.712mm for fixed support condition and 1.885mm for spring support condition.
Soil structure interaction of concrete gravity dam under seismic loading / Muhammad Fadhil Hamizan Mohd Zuki