is maroc-evasion.info - Free download as PDF File .pdf), Text File .txt) or read online for free. clauses of IS for structures other than buildings. The following are brought into the code explicitly, by introducing the 'response reduction factor' in place of the earlier performance glassware may break, and books fall down. The Indian seismic code IS has now been split into a number of parts and the first part containing general provisions and those pertaining to buildings has.
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Lateral Force Distribution as per Torsion Provisions of IS (Part I). 6 . Lateral Determine design seismic load on the structure as per new code. All Structures like need to be designed as per this code a Parking DESIGN OF STRUCTURES (GERERAL PROVISIONS AND BUILDINGS) -IS (For more information: 12 Tables of Code) Name of Legally Binding Document: (Part 1): Criteria for Earthquake Resistant Design of.
The earthquake resistant-design of structures, taking into account seismic data from studies of these Indian earthquakes, has become very essential, particularly in view of heavy construction programme at present all over the country. It is to serve this purpose that IS This standard has been split into five parts. Other parts in this series are: Part 1 General provisions and buildings Pafl.
Also, it contains provisions that are specific to buildings only.
Unless stated otherwise, the provisions in Part 2 to Part 5 shall be read necessarily in conjunction with Part 1. This standard contains provisions on earthquake resistant design of industrial structures including stack-like structures.
Industrial structures are covered in Section 1 and Stack-like structures are covered in Section 2.
All sub-clauses under the main clause 0. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be -rounded off in accordance with IS 2: The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
This standard describes the procedures b Transmission and communication towers; for earthquake resistant design of industrial structures. The following standards contain provisions which, a Process industries; through reference in this text, constitute provisions of this standard. At the time of publication the editions b Power plants; indicated were valid. P Consumer product industries; Part 1: Title EL — Response quantity due to earthquake load Part 1: Part 1 loads in Z-direction concrete chimneys: Assessment of loads second e.
I Symbols and notations applicable to Section 1 are T— Undamped natural period of vibration given as under: The random earthquake ground motions, which cause the d— Thickness of pile cap or rafl structures to vibrate, can be resolved in any three D Max — Maximum lateral deflection mutually perpendicular directions. The predominant direction of ground vibration is horizontal. Dvj D,m — Distribution factors for shear and moment respectively at a distance X Earthquake generated vertical inertia forces are to be from the top considered in design unless checked and proven to be not significant.
Actual forces that appear on structure should possess adequate strength, stiffness, structures during earthquakes are much greater than and ductility. Generally structures have large the design forces specified in this standard.
However, capacities of energy absorption in its inelastic region. Reinforced and prestressed concrete members shall be Structures are classified into the following four suitably designed to ensure that premature failure due categories: Provisions for a Category 1: Structures whose failure can appropriate ductile detailing of reinforced concrete cause conditions that -can lead members are given in 1S Structures whose failure can cause conditions that can lead 6.
Structures whose failure, and design of equipment. The following assumptions shall be made in the earthquake resistant design of structures: All other structures.
Therefore, resonance of implies loss of function and not complete collapse. These loads response due to earthquake force EL is the maximum shall be taken as per equipment specifications.
Earthquake loads in x 7. These combinations arc to be made at the member forcektress Iev-ets. The factors defined in 7. In the plastic design of steel structures, the following 7. However, for steels having a include erection loads and crane payload, definite yield stress, the stress be limited to the yield stress, for steels without a definite yield point, the stress 7.
Such sites two components are 30 percent of the corresponding should preferably be avoided while locating new maximum. All possible combinations of the three settlements or important projects.
Alternatively, deep pile foundation may be provided and taken to depths well -where into the layer, which is not likely to Iiquify. Marine z. Categorization of some individual structure and components of typical industries are given h-t 7.
All The mathematical model of the physkcal structure shall Category 1 industrial structures shall be analyzed using include all elements of the lateral force-resisting site-specific spectra. However, if site-specific studies system.
The model shall also include the stiffness arc not carried out, the code specified spectra may be and strength of elements, which are significant to the used with modifications as per 8. If time-history distribution of forces. The model shall properly analysis is to be carried out, spectra-compliant time- represent the spatial distribution of the mass and history shall be determined based on the site-specific stiffness of the structures, as well as mass of equipment spectra.
The soil-structure interaction may not be considered in the seismic analysis for structures 8. Type 1[ Medium Soils: S1 No. S Following Indian Standards may also be referred: Categories of Structures Importance Factnr see 7. No interaction the equipment or secondary system is 1 percent or between the structures and equipment shall be Iem of the mass of the supporting primary structure.
No interaction between the structures and equipment shall be considered. In such case MF should be 9. When a simple model is used, the secondary system 9. The mass ratio in Fig. It would be difllcult to give one or two generalized formulae to cover all such structures.
PI where 9. Irequency 01 unccwpled mode I of primary s em 1. The recommended damping factors distance between centre of mass and centre of are given in Table 4. Reinforced concrete flooring systemat a level shall be considered rigid However, those three orthogonal two horizontal and one vertical structures of Category 4, which could be identified as components of earthquake motion.
The earthquake buildings, may be analysed as per provisions of motion in each direction shall be combined as specified IS Part 1 , in 7. The analysis shall be based on Both direct solution of the equations of motion or model superposition The effect of accidental eccentricity shall be method can be used for this purpose.
This shall be applied as an additional torsion force equal to product This peak response quantity due to the closely 90 percent of the total seismic mass. The static load at each node shall equal the? I Foundations Clause 7. Structures Category avoided for structures in seismic zones ,IV and V.
Administration building 4 or pile caps shall be interconnected with ties see 5. Air washer pump house 2. All 3. Air pre-heaters 2 -ties shall be capable of carrying, in tension and in compression, an axial force equal to AJ4 times the 4.
Ash collection silos 2 larger of the column or pile cap load, m addition to 5.
Ash dyke 2 the otherwise computed forces. Here, Ah is as 6. Ash water pump house 2 per 8. Ash water re-c. Bagging and palletizing building 2 other vertical cantilever projections attached to structures and projecting above the roof, shall be Ball mill and silos 2 designed for five times the design horizontal Boiler and boiler house 2 acceleration spectrum value specified in 8.
Bridges over rivers 2 and 8. Caustic tanks 2 shall be designed for five times the design vertical acceleration spectrum value specified in 8.
Clarifloculator 2 projecting parts and their connections with the main Coal handling plant 2 structures. For the design of the main structure, such increase need not be considered. Coal slurry settling pond 2 Condenser polishing unit 2 Stack-1ike structures are those in which the mass and Construction workshop 3 stiffness is more or less uniformly distributed along Control and instrumentation building 2 the height.
Cantilever structures. Iike reinforced or Control building 2 prestressed cement concrete electric poles; reinforced concrete brick and steel chimneys including multiflue Control building blast resistant 1 chimneys , ventilation stacks and refinery vessels are 29, Converters 2 examples of such structures. The guyed structures are not covered here. Conveyor galleries 2 Corex gas station tbr co-generation plant 2 Time period of vibration, T of such structures when fixed at base, shall be calculated using either of the Crusher house 2 following two formulae given see Crushers 2 The formulae given at.
Only 35, Cryogenic storage tank double walled 1 onc of these two formulae should be used for design. Cryogenic storage tanks with refrigerated 2 condition can also be adopted. L, and other normal design forces, the permissible stresses in c 1.
However, for steels having a include crcclion 1 :lds and crane payload. Table I, depending upon type of foundation of the NUlL. In soil deposits consisting of submerged loose sands 7.
Such sites two components are 30 percent of the corresponding sh ou Id pre fera bly be avo ided w hi Ie loca tin g 11 ew maximum.
Alternatively, deep pile force twice that fOllnd lIsing the provisions of this clause. IS Part I.
I Structures in Category I shall be designed for of the structure given in Table 3. Categorization of some individual structure and components of typical industries are given in 7. All The mathematical model of the physical structure shall Category 1 industrial structures shall be analyzed using include all elements of the lateral force-resisting site-speciflc spectra.