Analisis Keruntuhan Struktur Srpm Baja Dengan Bracing Konsentrik Akibat Getaran Gempa Berulang Dan Pengaruh Beban Gravitasi
Abstract
Gempa bumi merupakan fenomena alam yang disebabkan oleh adanya pelepasan energi regangan elastis batuan pada litosfir. Tidak jarang gempa datang secara berulang (gempa susulan) terkhusus wilayah Indonesia yang merupakan wilayah zona gempa. Oleh karena itu diperlukan struktur bangunan yang mampu meminimalisir resiko kerusakan akibat gempa terkhusus gempa yang datang secara berulang yang memberikan energi lebih besar dibandingkan dengan gempa tunggal. Pada tugas akhir ini direncakan sebuah struktur dengan 9 lantai yang dimodelkan terhadap 1 jenis penskalaan rekaman gempa yaitu pensekalaan MCE untuk analisis nonlinier. Dari hasil analisis yang di dapatkan dari hasil memodelkan struktur baja dengan kondisi tanah keras (R6) terhadap gempa tunggal dan gempa berulang yang didapatkan nilai Incremental Dynamic Analysis nilai IDR dari gempa berulang lebih besar dari pada gempa tunggal, pada gempa tunggal memiliki nilai RSA(T1) = 1 mendapatkan nilai IDR = 0,083 dan pada gempa berulang memiliki nilai RSA(T1) = 1 menapatkan nilai IDR = 0,094. Hasil analisis juga menunjukan nilai probabilitas (CP) = 5%, dan (LS) = 2,5%, yang diperoleh gempa berulang selalu memerlukan nilai RSA(T1) yang lebih besar dari pada gempa tunggal untuk mencapai kondisi mendekati keruntuhan.sedangkan nilai probabilitas 10% memerlukan nilai RSA(T1) yang lebih besar dari pada gempa berulang untuk mencapai kondisi keruntuhan.
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