indonesia sismic

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Indonesia [ Back to Seismic Design Code Index ] [ Back to Country Index ]Code Name Indonesian Earthquake Code

Issued by Ministry of Public Works

Revision

Horizontal BaseShear

where

Wt: Combination of the total vertical dead load and the reduced

vertical live loadC: Basic seismic coefficient(Note: This value shall be determined from Fig.1 for the seismiczones shown in Fig.2 using the structural period and the types ofsubsoil.)I: Importance factor (See table 1)K: Structure type factor (See table 2)

The types of subsoilThe types of subsoil are considered in selection ofC firm and soft.

For the purpose of this code a structure shall be considered as being ona soft subsoil if it is located on soil deposits exceeding the followingdepths.

For a cohesive soil with an average undrained shearstrength not exceeding. 5kg per sq.cm. (50 kPa) : 6m

Any site where the overlying soils are either cohesive withan average undrained shear strength not exceeding 1kg persq.ca. (100 kPa) or a very dense granular material : 9m

For a cohesive soil with an average undrained shearstrength not exceeding 2kg per sq.cm. (200 kPa) : l2m

For a very dense cemented granular soil : 20mn

These provisions should apply regardless of whether thereare piles extending to a deeper hard layer.

Depths shall be measured from the level at which theground provides effective lateral restraint to the building.

For soils less deep than these limits the subsoil shall be considered asfirm.

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Fig Indonesia 1Basic Seismic Coefficient

3ULQW &ORVH

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Fig Indonesia 2Seismic Zones For Structural Design Loadings

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Fig Indonesia 2 Page 1



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Table Indonesia 1

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TYPE OF BUILDING

IMPORTANCE

FACTOR Ia. Monumental Buildings

b. Essential facilities that should remain functional after anearthquakeExamples of these facilities would be :HospitalsFood storage structuresEmergency relief storesPower stationsWater works

Radio and Television facilitiesPlaces of assembly

c. Distribution facilities for gas or petroleum products in urbanareas

d. Structures for the support or containment of dangeroussubstances (such as acids, toxic substances etc)

e. Other structures

1.5

1.5

2.0

2.0

1.0

Table Indonesia 1 Page 1



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Table Indonesia 2

NOTES: (Refer to Commentary Clause C3.4.4 for further amplification.)

1. Ductile shear walls are those in which the height-to-width ratio of individual wallsexceeds 2. Walls of limited ductility are those that do not comply with this ratio.

2. Timber shear walls are those in which a timber frame is clad with timber sheathing insuch a way as to form a diaphragm capable of resisting horizontal loads.

3. For structures in which members employ both prestressing and nonprestressedreinforcement to resist the seismic load a K value shall be determined by interpolating

between that for reinforced concrete and prestressed concrete giving consideration tothe proportion of the seismic load resisted by the two materials.

4. Structures not falling within the categories listed in this table may be assigned a Kfactor by interpolation between the tabulated K values by a comparison of the

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STRUCTURE TYPE

CONSTRUCTION

MATERIALOF THE SEISMIC ENERGYDISSIPATING ELEMENTS

STRUCTURALTYPEFACTOR K

DUCTILE FRAMES

COUPLED SHEAR WALLSWITH DUCTILE WALLS (1)

CANTILEVER DUCTILESHEAR WALLS (1)

CANTILEVER SHEARWALLS OF LIMITEDDUCTILITY (1)

DIAGONALLY BRACEDFRAMES

CANTILEVERED SINGLESTOREY FRAMES (5)

CHIW4EYS, SMALLTANKS

OTHER STRUCTURES

Reinforced ConcretePrestressed Concrete (3)SteelTimber

Reinforced Concrete

Reinforced ConcreteReinforced Hollow MasonryTimber (2)

Reinforced ConcreteReinforced Hollow MasonryTimber (2)

Reinforced ConcreteSteelTimber

Reinforced ConcreteSteel

Reinforced ConcreteSteel

1.01.41.01.7

1.0

1.22.52.0

1.53.02.5

2.52.53.0

2.52.5

3.03.0

See Note4




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structures ductility and energy dissipating capacity. A value of K = 4.0 should be usedfor structures not designed to resist earthquake.

5. This value of K is applied where the horizontal restraint is provided by only one or twocolumns or there is no roof diaphragm capable of transferring the seismic load betweenthe frames. If there are three or more columns and there is a roof diaphragm the frames

may fall within the category of ductile frames.


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