MODEL PORTAL 3 DIMENSI
Portal direncanakan menggunakan code ACI 318-05/IBC 2003 dengan mutu baja dengan tegangan leleh Fy = 240000 KN/m, dan Mutu Beton f’c = 25 Mpa. Kombinasi pembebanan sebagai berikut : 1.4 DL 1.2 DL + 1.6 LL 1.2 DL + 1 LL + 1 G 1.2 DL + 1 LL - 1 G 0.9 DL + 1 G 0.9 DL - 1 G Untuk analisis dan desain model ini dapat dilakukan langkah-langkah sebagai berikut : A. Menentukan Geometri Struktur 1. Tentuk Tentukan an unit unit yang yang sesu sesuai ai ialah ialah KN-m KN-m 2. Pilih me menu File/new Model From Template..., maka akan tampilkan dialog box ‘ Model Templates a. Pilihlah Pilihlah gambar gambar yang akan digunakan, digunakan, yaitu 3D Frames
b. Lalu akan ada tampilan space fream, isikan sesuai dengan soal
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c. Setelah itu akan muncul gambar portal 3 dimensi dengan tumpuan jepit
B. Menentukan Material dan Section 1. Pilih me menu Define/Material.., maka akan muncul dialog box Define Material a. Klik Klik mate materia riall CONCRETE, kemudi kemudian an klik klik Modify/Show Material maka akan muncul dialog box b. Tentukan steel yield stress = 210000 kN/m 2 (240 Mpa) dan fc = 30 Mpa, klik OK.
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Isi nama Profil pada Section Name K40/40 untuk kolom tepi, pilih CONC pada kotak material. Isikan tinggi (t3) = 0,4 m, lebar (t2) = 0,4 m.
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Klik pada Reinforcement, dan akan munsul dialog box seperti gambar
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Isikan selimut beton (Cover to Rebar center ) = 0,05 m, jumlah tulangan arah3 = 4 dan tulangan arah-2 = 4, maka akan muncul penampang kolom.
3. Ulangi Ulangi langkah langkah nomor nomor 2 di atas atas untuk untuk menentukan menentukan elemen elemen balok balok sebagai sebagai berikut berikut : a.
Klik pa pada dr drop-down bo box Add Tee,ditampilkan dialog box ‘ Tee Section’.
b.
Isikan nama Profil pada Sect dengan ATAP ATAP untuk untuk balok balok atap, atap, Section ion Name dengan kemudian pilih CONC pada pada kotak kotak materia material. l. Isikan Isikan tinggi tinggi (t3) (t3) = 0,4 lebar
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c.
Klik pada Reinforcement,disini element Class diganti Beam, isikan selimut beton atas (top) = 0,05 dan bawah (bottom) = 0,05.
d.
Ulan Ulangi gi langk langkah ah nomor nomor 3 untu untuk k mene menent ntuk ukan an poton potonga gan n balo balok k lant lantai ai deng dengan an nama potongan potongan LANTAI dengan tinggi tinggi (t3) = 0,40, lebar sayap (t2) = 1,2, tebal sayap (tf) = 0,12, tebal badan (tw) = 0,3
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C. Menentukan Property Elemen 1. Pili Pilih h kolo kolom m dari dari port portal al deng dengan an klik klik satu satu pers persatu atu pada pada elem elemen ennn nnya. ya.Pi Pili lih h menu menu assign/Frame/Sections..,tampil dialog box ‘Define Frame section’.: •
Klik pada pada K40/40 di area Name. Klik ok button button
2. Pilih Pilih elemen elemen balok, balok, kemudia kemudian n ulaagi ulaagi langkah langkah nomor nomor 2 untuk untuk menentuk menentukan an balok dengan memilih ATAP,LANTAI1., LANTAI2 pada area Name. 3. Setelah selesai, selesai, maka maka akan akan muncul muncul gambar gambar seperti seperti beriku berikutt
D. Menentukan Load Case 1.
Define/Static tic Load Case.., ditampilkan dialog box Pilih Menu Define/Sta
‘Define ‘Define static Load Case Names’,ditampilk Names’,ditampilkan an LOAD1,tip LOAD1,tipee beban BS dan selfweight weight multip multiplie lier) r) sama sama dengan dengan 1,ubah 1,ubah namany namanyaa menjad menjadii BS di Load1 Load1,, klik klik Change Load,. 2.
Dari dialog box ‘Define Static Load Case Names’ : •
Ubah BS menjadi MATI, HIDUP, pilih tipe LIVE dari list box
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Ubah Ubah peng pengal alii bera beratt send sendir irii (sel (selfw fwei eigh ghtt mult multip ipli lier) er) menj menjad adii
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E. Menentukan Kombinasi Beban Rencana 1.
Define/Load d Combinatio Combinations ns..,Klik Gunakan menu Define/Loa ..,Klik tombol tombol Add
New Combo
2.
1, Pilih BS dan MATI Load Case ,masukkan 1.4 Untuk COMBI
pada skala factor. Klik tombol Add, lalu klik OK .
3.
COMB2, nilai BS, MATI Load Case : 1,2 dan HIDUP Load Case
: 1,6 , klik OK
4.
COMB 3, nilai BS, MATI Load Case : 1.2, HIDUP Load Case: 1,
SPECTRA Load Case : 1 pada scale factor, klik OK .
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5.
COMB 4, nilai BS, MATI Load Case : 1.2, HIDUP Load Case: 1,
SPECTRA Load Case : -1 pada scale factor, klik OK .
6.
COMB COMB 5, nilai BS, MATI Load Case: 0,9, , SPECTRA Load
Case : 1, klik OK .
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F. Menentukan Spectrum Case 1. Pili Pilih h men menu u Define/Functions..,klik Response Spectrum, lalu pilih Modify 2. Isi bo box Define Function sesuai ketentuan SNI Gempa dengan wilayah 4 dan tanah sedang, klik ok
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H. Menentukan Beban Frame dan Joint
Beban Mati
1. Pilih frame ame atap, pilih menu enu Assign/Fr ilih Assign/Frame/C ame/Cable able/Tend /Tendon on Loads Loads, pilih Distributed, klik OK. Pilih Load Case Name MATI •
Bagian pinggir,bentang 3m, Distributed Loads = 2.7172 kN (beban segitiga)
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Bagian pinggir,bentang 4m, Distributed Loads = 2.470 kN (beban trapesium)
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Bagian tengah,bentang 3m, Distributed Loads = 5.4344 kN (beban segitiga)
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Bagian tengah,bentang 4m, Distributed Loads = 4.94 kN (beban trapesium)
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Bagian tengah,bentang 3m, Distributed Loads = 7.7634 kN (beban segitiga)
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Bagian tengah,bentang 4m, Distributed Loads = 6.793 kN (beban trapesium)
Beban Hidup
Assign/Frame/C ame/Cable able/Tend /Tendon on Loads Loads, pilih 1. Pilih frame ame atap, pilih menu enu Assign/Fr ilih Distributed, klik OK. Pilih Load Case Name HIDUP •
Bagian pinggir,bentang 3m, Distributed Loads = 2.470 kN (beban segitiga)
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Bagian tengah,bentang 4m, Distributed Loads = 4.18 kN (beban trapesium)
2. Ulangi langkah langkah di atas untuk untuk frame
untuk Load Case HIDUP
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Bagian pinggir,bentang 3m, Distributed Loads = 3.3965 kN (beban segitiga)
•
Bagian pinggir,bentang 4m, Distributed Loads = 3.0191kN (beban trapesium)
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Bagian tengah,bentang 3m, Distributed Loads = 6.793 kN (beban segitiga)
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Bagian tengah,bentang 4m, Distributed Loads = 6.0382 kN (beban trapesium)
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BEBAN MATI
BEBAN HIDUP
I. Analisis Model 1.
Pilih menu Analyze/Set Options..,pilih Space Frame, klik OK
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J. Kontrol Tegangan dan Desain Struktur. 1.
Pilih Menu Design/Concrete Design/Concrete Design dalam keadaan aktif , yang ditunjukkan dengan tanda pada item menu Design/Concrete Design.