Analisis baja kisi tiang guyed mengalami beban lingkungan

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Januari 12, 2019
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Januari 21, 2019

Analisis baja kisi tiang guyed mengalami beban lingkungan

Analisis baja kisi tiang guyed mengalami beban lingkungan

tiang-tiang baja kisi peringkat di antara struktur load-bearing yang paling efisien di bidang konstruksi bertingkat tinggi. Analisis non-linear dari baja kisi tiang guyed dilakukan dengan menggunakan SAP 2000 Program terbatas-elemen untuk nilai-nilai ketebalan es yang berbeda pada 1500 m dari ketinggian. Setelah definisi model geometris dan lintas- sifat bagian, berbagai kombinasi beban dianalisis. Akhirnya, kecepatan angin- Hubungan ketebalan es diperoleh, dan kecepatan angin maksimum bahwa struktur dapat menahan ditentukan untuk berbagai es ketebalan.

  1. pengantar

Lattice mast is a general name for different kinds of steel masts.A lattice mast or truss mast is a freestanding framework mast. These structures can be used as transmission masts especially for

voltages of more than 100 kilovolt, as radio masts (self-radiating masts or carriers for aerials), or as observation masts for safety purposes. Big and heavy frame sections are not required in these

masts. This is why they are lighter than other mast types, and the modules can easily be connected to one another.

Steel lattice masts have been used for many years in the countries where the ice and wind loads are considerable. This is due to increasing demands of modern industry with regard to communication and energy. There are different styles of masts on which small wind generators are mounted: freestanding, guyed lattice, and tilt-up. Freestanding masts are relatively heavy duty, and they stay upright without the help of guy cables. Guyed lattice masts use guy cables to anchor the mast and keep it upright using a relatively small quantity of concrete. Cables stretch from three points near the top of the mast to the ground at some distance from the base of the mast. These constructions are quite light compared to freestanding masts, and therefore constitute the least expensive means for supporting a wind turbine. Namun, they require a larger area to accommodate the guy cables.

The technical efficiency and durability of steel lattice masts have increased in recent years. The behaviour of steel lattice masts has been investigated in literature. As the design procedure is significant in these masts, the structural analysis is related to the geometrical model and section properties. Demikian, the module production and assembly steps, and economic costs, are directly related to the design of masts. Steel lattice masts on land are vulnerable structures. They are mostly affected by environmental loading. Wind loads are the most effective design criteria for these structures. Namun, the ice effect must also be taken into consideration, especially at high elevations. In cold regions, these two effects are combined. Karena itu, the relationship between the wind and ice must be investigated by conducting proper finite-element analyses to avoid the collapse of such structures. In this paper, the non linear analysis of a guyed steel lattice mast 80 m in height is performed using the SAP 2000 program. While the model is constituted according to TS 648 load conditions are taken from TS 498. The altitude of the structure is taken to be 1500 m, and the snow region IV is adopted, which is the most conservative option. Lewat sini, the analysis can also be used for other snow regions. The structure was first analysed without any ice effect. Afterwards, the ice thickness was gradually increased, and the relationship between the wind speed and ice thickness was determined.

  1. Materialand method

Proper sections and angles of the steel lattice mast are first determined. Afterwards, the three dimensional finite element model is given in Figure 1. Top view of the model is presented

in Figure 2. Face sections of the model, showing the distances with angles, are shown in Figure 3 and Figure 4.

Angka 1. 3-D model

 

Angka 2. Teratas melihat

 

 

Angka 3. SEBUAH dan B wajah bagian

 

 

Angka 4. C wajah bagian

Meja 1. Bahan sifat

Bahan

mengetik

tarik

kekuatan

[MPa]

Menghasilkan

kekuatan

[MPa]

St52 (S355)

510

360

Meja 2. bagian sifat

Anggota

mengetik

Bagian

mengetik

Ukuran

[mm]

Kolom

anggota

Pipa

48×7

Vertikal

anggota

Bundar

16

Diagonal

anggota

Bundar

16

Guy members

Bundar

16

Meja 3 kecepatan angin dan beban menurut tinggi badan

Tinggi

[m]

Angin kecepatan

“v”

[Nona]

Angin beban

“q”

2

[kg / m ]

0-8

28

50

8-20

36

80

20-80

46

130

A module 3015 mm in length is made of steel members. Columns are placed at an angle of 900 to the ground. Vertical steel members connect columns to one another, and are placed vertically with respect to the columns. Diagonal members are placed by definite angles to the columns, and they also connect the columns to one another. A column with diagonal and vertical members that constitute the module, are shown in Figure 5.

 

Angka 5. Modul anggota

Guy members and modules are named according to the total height from the ground level. The guy and section numbers, with related heights, are presented in Figure 6.

Meja 4. Tinggi dan salju sifat

tinggi

[m]

Salju

wilayah

Salju beban qs

2

[kg / m ]

1500

IV

176

Meja 5. Es sifat

Berat dari satuan volume

[kN / mm ³ ]

7

Ada 26 modul di tiang kisi. Kolom, vertikal,dan anggota diagonal di setiap wajah dari modul ini adalah shownin Gambar 7. arah angin positif dan negatif yang mempengaruhi
Modul juga disajikan dalam gambar.

Meja 6 sifat bagian

 

Anggota

 

Bagian

mengetik

Bagian

ukuran

[mm]

Bagian

lingkar

[cm]

Bagian

daerah

2

[cm ]

Kolom

Pipa

48×7

15.08

9.02

Vertikal

Bundar

16

5.03

2.01

Diagonal

Bundar

16

5.03

2.01

Orang

Bundar

16

5.03

2.01

Kolom

Pipa

48×7

15.08

9.02

Vertikal

Bundar

16

5.03

2.01

Diagonal

Bundar

16

5.03

2.01

Orang

Bundar

16

5.03

2.01

Kolom

Pipa

48×7

15.08

9.02

Vertikal

Bundar

16

5.03

2.01

Diagonal

Bundar

16

5.03

2.01

Orang

Bundar

16

5.03

2.01

Kolom

Pipa

48×7

15.08

9.02

Vertikal

Bundar

16

5.03

2.01

Diagonal

Bundar

16

5.03

2.01

Orang

Bundar

16

5.03

2.01

 

 

Load combinations used in the analysis are given in Eqn (1) and Eqn (2) sebagai berikut. The combinations are constituted by Snow loads, ice loads according to ice thickness values,

and wind loads effecting different heights of the lattice mast with wind speeds are given in Table 7.

 

Anggota

Salju

beban

2

[kg / m ]

didistribusikan

salju beban

[kg / m]

Es

ketebalan

[mm]

didistribusikan

Es beban

[kg / m]

Angin

kecepatan

[km / jam]

Angin beban menurut untuk tinggi

[kg / m]

0-8 m

8-20 m

20-80 m

Kolom

 

176

-

 

30

5.15

 

209

12.18

19.49

26.81

Vertikal

anggota

4.42

3.03

4.06

6.50

8.94

Diagonal

anggota

4.42

3.03

4.06

6.50

8.94

Orang

4.42

3.03

4.06

6.50

8.94

Kolom

 

176

-

 

20

2.99

 

217

12.63

20.21

27.79

Vertikal

anggota

4.42

1.58

4.21

6.74

9.26

Diagonal

anggota

4.42

1.58

4.21

6.74

9.26

Orang

4.42

1.58

4.21

6.74

9.26

Kolom

 

176

-

 

10

1.28

 

223

12.96

20.73

28.50

Vertikal

anggota

4.42

0.57

4.32

6.91

9.50

Diagonal

anggota

4.42

0.57

4.32

6.91

9.50

Orang

4.42

0.57

4.32

6.91

9.50

Kolom

 

176

-

 

0

-

 

226

13.14

21.03

28.92

Vertikal

anggota

4.42

-

4.38

7.01

9.64

Diagonal

anggota

4.42

-

4.38

7.01

9.64

Orang

4.42

-

4.38

7.01

9.64

efek beban lateral anggota. beban salju didistribusikan dihitung dengan mempertimbangkan luas permukaan atas anggota.

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