Analisis Komponen Struktur Baja dengan AISC-LRFD 2005: Teori Bambang Suryoatmono Unpar
Metode Desain
1
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Metode Desain AISC ‘05
Desain dengan Kekuatan Izin (ASD)
LRFD dengan Analisis Elastis
Desain dengan Kekuatan Izin (Allowable Strength Allowable Strength Design Design )
Kuat izin setiap komponen struktur tidak boleh kurang dari kekuatan yang dibutuhkan
Ru ≤
Rn
Ω
Ru = kekuatan yang dibutuhkan (ASD) Rn = kekuatan nominal
Ω = faktor keamanan R /Ω = kuat izin
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Desain dengan Kekuatan Izin ( Allowable Strength Design Strength Design ) (lanjutan)
Gaya dalam pada komponen struktur dilakukan dengan analisis elastis orde pertama pada kondisi beban kerja Efek orde kedua dan inelastisitias ditinjau secara tidak langsung Faktor keamanan diterapkan hanya pada sisi tahanan, dan keamanan dihitung pada kondisi beban kerja (tak terfaktor) Jadi pada ASD reliabilitas yang seragam tidak mungkin dicapai Metode desain
LRFD dengan Analisis Elastis
Kuat rencana setiap komponen struktur tidak boleh kurang dari kekuatan yang dibutuhkan yang ditentukan berdasarkan kombinasi pembebanan LRFD
Ru ≤ φ Rn Ru = kekuatan yang dibutuhkan (LRFD) Rn = kekuatan nominal
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LRFD dengan Analisis Elastis (lanjutan)
LRFD memperhitungkan keamanan pada kedua sisi (efek beban dan tahanan) Setiap kondisi beban mempunyai faktor beban yang berbeda yang memperhitungkan derajat uncertainty , sehingga dimungkinkan untuk mendapatkan reliabilitas seragam Analisis yang dapat dipilih untuk mendapatkan efek beban:
Analisis Elastis Orde Kedua, atau Analisis Elastis Orde Pertama dan efek orde kedua diperhitungkan dengan menggunakan faktor amplifikasi momen B1 dan B2.
Efek inelastis ditinjau secara tidak langsung.
LRFD dengan Analisis Elastis (lanjutan)
Indeks Reliabilitas = indeks keamanan =
β =
ln( R n / Q n )
V R2 + V Q2
R = tahanan rata − rata Q = efek beban rata − rata V = koefisien variasi tahanan
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LRFD dengan Analisis Elastis (lanjutan) Probability Density β V R2 + V Q2
Pf = P[ln(R/Q 22 mm)
Contoh Soal Komponen Struktur Tarik, ada Lubang Berseling
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