DISTIBUSI BEBAN RANGKA KUDA KUDA

DISTRIBUTION OF CHOICE OF HORSES

A. Death Load Analysis

Tested pipe steel profile (circular hollow section) D = 114.3 mm, wall thick = 5.6

Pipe profile weight (Qx) =

The weight of the whole horses (Q) =

1. Beban atap (P)

Q_atap (Asbes)    =  11 kg/m²

L                      = 2,15 m          = 2150 mm

l₁ (A1)             = 1,678 m        = 1678 mm

P                      =  Q_atap × L      = 11 × 2,15 = 23,65 kg/m

Distribusi pembebanan :

P₁ = P₉

P₁         = 0,5 × l₁ × P

= 0,5 ×1,678 × 23,65 = 19,842  kg.

P₂ = P₃  = P₇ = P₈

P₂         = 0,5× (l₁ + l₂)× P

= 0,5× (1,678 + 1,678) × 23,65 = 39,68 kg.

P₄ = P₆

P₄         = 0,5 ×(l₃ + l₄) × P

= 0,5 × (1,678 + 1,678) × 23,65 =  39,68 kg.

P₅         = 0,5 ×(l₄ + l₅) × P

= 0,5 × (1,678 + 1,678) × 23,65  = 39,68 kg.

2. Beban langit-langit

Beban penggantung langi-langit         = 7 kg/m²

Beban eternit                                       = 11 kg/m²₊

Beban langit-langit                              = 18 kg/m²

q          = 18 m

L          =  2,15 m

q          = Q × L           = 18 × 2,15      =  38,7 kg/m

distribusi pembebanan :

P₁ = P₉

P₁         = 0,5 × l₂ × q

= 0,5 × 1,678 × 38,7 = 32,47 kg

P₂ = P₃  = P₇ = P₈

P₂         = 0,5 × (l₂ + l₂) × q

= 0,5 × (1,678 + 1,678) ×38,7  = 64,94 kg

P₄= P₆

P₄         = 0,5 × (l₃ + l₄) × q

= 0,5 × (1,678 + 1,678) ×38,7  = 64,94 kg

3. Beban gording

Profil kanal 125 × 65 × 6 × 8

Q_S        =  13,4kg/m.

L          =  2,15 m.

Berat sendiri gording + 10% berat gording

W        = 13,4kg/m + (10% ´13,4kg/m)  = 14,74 kg/m.

Beban total gording

P          = W × L = 14,74 × 2,15 = 31,69 kg.

Distribusi pembebanan :

P₁ = P₂ = P₃ = P₄ = P₆ = P₇ = P₈ = P₉ = P =  31,69 kg

P₅ = 2 × P = 2 × 31,69 =  63,38 kg.

B.     Analisis Beban Hidup

Beban hidup minimum direncanakan 100 kg terpusat pada joint

P₁ = P₉ = ½ × 100 = 50 kg

P₂ = P₃ = P₄= P₅= P₆ = P₇ = P₈ = 100 kg

C.    Analisis Beban Angin

Sudut kuda-kuda (α)               = 35⁰

Q_angin                                        = 35 kg/m²

Jarak antar gording (B)           = 1,375 m

Jarak antar kuda-kuda             = 2,8 m

a)      Beban tekan angin (W_t)

= (0,02 α – 0,4) x 35

=(0,02 x 35⁰ – 0,4) x 35

= 10,5 kg/m²

Beban angin tekan :

P_tepi                = Wtx 0,5 x B x L

                  = 10,5 x 0,5 x1,375 x 2,8

                  = 20,21 kg

P_tengah         = W_t x B x L

                  = 10,5 x 1,375 x 2,8

                  = 40,42 kg

Distribusi beban :

Pv _tepi         =P_tepi cos 35⁰                 =20,21 x cos 35⁰         = 16,55

Pv _tengah        =P_tengah  cos 35⁰            =40,42 x cos 35⁰         = 33,11

Ph _tepi         =P_tepi sin 35⁰                      =20,21 x sin 35⁰          = 11,59

Ph _tengah      =P_tengah sin 35⁰              =40,42 x sin 35⁰          =23,18

b)      Beban hisap (W_h)

= -0,4 x Q_angin

= -0,4 x 35

= - 14 kg/m²

Beban angin hisap :

P_tepi            = W_h x 0,5 x B x L

                  = -14 x 0,5 x 1,375 x 2,8

                  = -26,95 kg

P_tengah         = W_tengah x B x L

                  = -14 x 1,375 x 2,8

                  = -53,9 kg

Distribusi beban :

Pv _tepi         =P_tepi cos 35⁰                 = -26,95 x cos 35⁰       = -22,08

Pv _tengah        =P_tengah  cos 35⁰            = -53,9 x cos 35⁰         = -44,15

Ph _tepi         =P_tepi sin 35⁰                      =  -26,95 x sin 35⁰       = -15,46

Ph _tengah      =P_tengah sin 35⁰              = -53,9 x sin 35⁰          = -30,91

D.    Beban Total

a.       Beban mati

P₁ = P₉ = B.atap+B.langit-langit+B.gording

= 19,84 + 32,47 + 31,69

=  84 kg.

P₂ = P₃ = P₇ = P₈

P₂                     = B.atap+B.langit-langit+B.gording

= 39,68 + 64,94 + 31,69

= 136,31 kg.

P₄ = P₆ = B.atap+B.langit-langit+B.gording

= 39,68 + 64,94 + 31,69

= 136,31 kg.

P₅                       = B.atap+B.langit-langit+B.gording

= 39,68 + 64,94 + 63,38

= 168kg.

b.      Beban hidup

P₁ = P₉ = 50 kg

P₂ = P₃ = P₄ =P₅ = P₆ = P₇ = P₈ = 100 kg

E.     ANALISIS SAP 2000

Analisis Sap 2000 pada rancangan kuda - kuda terhadap beban yang akan diterima. Profil  kuda – kuda dipakai 2L 50504 (Double Angle).

Mutu baja Bj 52 :

σ_l=3600 kg/cm = 360 mpa   

σ =2400 kg/cm = 240  mpa

Modulus elatisitas 2,1x10⁶ kg/cm²

1. Untuk Beban Hidup (LL=Life Load)

P1 = P9 = 50 kg

      P2 = P3 = P4 = P5 = P6 = P7 = P8 = 100 kg

2. Untuk Beban Mati (DL=Dead Load)

Tanpa memperhitungkan berat kuda – kuda, sehingga rumusnya menjadi:

P = B. atap + B. langit – langit  + B. gording

P1= P9

= 19,84 + 32,47 + 31,69 =84 kg.

P2 = P3 = P7 = P8

= 39,68 + 64,94 + 31,69 = 136,31 kg.

P4 = P6

= 39,68 + 64,94 + 31,69 = 136,31 kg.

P5= 39,68 + 64,94 + 63,38 = 168kg.

Tabel IV.1. Pembebanan

Nama	Beban Mati (kg)	Beban Hidup (kg)
P1	84	50
P2	136,31	100
P3	136,31	100
P4	136,31	100
P5	168	100
P6	136,31	100
P7	136,31	100
P8	136,31	100
P9	84	50

                  Sumber :HasilPerhitungan

Catatan : Load combination title (1,2DL) + (1,6LL)

   Scale Factor DL = 1,2    LL = 1,6   W = 0,8