IS 2974 PDF
IS Code of practice for design and construction of machine foundations, Part 1: Foundation for reciprocating type machines. byBureau. IS Code of practice for design and construction of machine foundations, Part 4: Foundations for rotary type machines of low frequency. IS Code of practice for design and construction of machine foundations, Part 2: Foundations for impact type machines (hammer.
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Disclosure to Promote the Right To Information. Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to. IS (): Code of practice for design and construction of machine foundations, Part 3: Foundations for rotary type machines (Medium and high. IS: (Part I) - (Reaffirmed ). Edition (). Price Group 6. Indian Standard. CODE OF PRACTICE FOR. DESIGN AND CONSTRUCTION.
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Embeds 0 No embeds. No notes for slide. JAIN G. Foundations for these machines have to be specially designed taking into consideration the impact and vibration characteristics of the load and the properties of soil under dynamic conditions. While many of the special features relating to ;he design and construction of such machines foundations will have to be as advised by the manufacturers of these machines, still a large part of the details will have to be accord- ing to certain general principles of design covering machine foundations.
This standard is intended to lay down these general principles. This part, which is the first of a series of standards relating to machine foundations, deals with machines of the reciprocating type for which rigid-block type foundations are generally used.
This standard was first published in and revised in In this revision, the principal modifications made are in respect to providing additional information of pile foundation, grouting and inclusion of guidelines for installation of anti-vibration mountings and testing and measurement of vibration.
The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
is code 2974 pdf
SCOPE 1. Lateral p.
The primary inertia force has one complete cycle and the secondary inertia force two cycles per revolution of the crank shaft. For foundation design it is usually necessary to consider only the primary and secondary vertical and horizontal couples. It is termed viscous damping when the force of damping is directly proportional to the instantaneous velocity of the oscillating system. NOTE- System meant the machine, the foundation block and soil. The natural freqencies depend on the number of degrees of freedom being defined as the number of co-ordinates required to identify a point on the rigid body.
The factor should be assumed as 3 unless otherwise specified. These include the following: Design critrria based on frequency and amplitude limits c,nn be classed as follows: Where this is not po;sible, the natural frequency of the foundation-soil system shall be kept lower than the IoweGt disturbing f equency.
The fre- quency ratios in such ca;es shall not be lower than l NOTE - Even though machine may be balanced, minor disturbing forces can occur due to manufacturinq tolerances and other causes, for sensitive installations, the frequencies arising from these may have to be considered. Where no specific limit has been stated by the manufacturer, it may be taken that foundation satisfying the following amp!
In special cases where there are particular reasons to avoirl c! In all such cases, it shall be preferable to consolidate the soil unclerneath the fo! Both the foun: Sub- soil or resilient mounting. The foundation is subject to oscillations at determinable frequencies in six degrees of freedom Fig. Most motion considered in soil dynamics are translational, rotational, pressure on soil, unbalanced forces amplitude of motions, effect of foundation, effect of soil etc.
[PDF] [IS Code] Soil and Foundation Engineering Code Free Download
Impact forces or seismic forces cause shock accounting degree of unexpectedly and severity, inducing a periodic motion in pulse or transient vibration. This causes failure of foundation and resulting damage to the whole structures. Energy imparted by dynamic forces on soil grains, may cause several changes in soil structure, internal friction and adhesion.
Shock and vibration create liquefaction. The target of soil dynamics to study behaviour of soil subjected to dynamic loads and develops design procedure for foundation.
It has been noticed that the performance of machine foundation relay on the forces which are acting but also on their behaviour subjected to dynamic loads which relay on the speed of machine and the frequency. Thus the vibration analysis became necessary.
In another way it can be specified that every type of machine foundation needs detailed vibration study to know the dynamic property of foundation and its component part for proper function of machine.
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The whole knowledge of load transfer process from machine to foundation and as well the knowledge of excitation forces and related frequencies are required for the correct evaluation of machine foundation.
It is known fact that cost of foundation is a minute but contributing a lot in the company process cost. To study governing parameters required for design of machine foundation. To study the response of machine foundation under dynamic loads. To study soil structure interaction. A brief overview state that from the past few year many researcher contribute their efforts towards the analysis if machine foundation. Gieger carried out investigation to determine the natural frequencies of foundation.
Rauch deal with the machine and turbine foundation and contributed special efforts to practical and theoretical development of the science. Silva discussed about the design procedure elevated reinforced concrete foundation problem formulation and optimization techniques. Anyaegbunam suggested the formula was given to predict displacement within the allowable limits one variable type of equations had been developed to obtain mass of the concrete block.
A special effort was laid on the vibration problems in machine foundations. Bhandari was studied that dimension of foundation plays important role. The foundation were design with varying depth to study various modes of vibration. Dobry was presented about arbitrary shape of foundation the whole problem with six DOF is converted in to single degree problem with calculation of damping and stiffness. Damping effect on soil was also considered with simple numerical methods.
Huang All rights reserved by www. George Garetas in this paper brief about the comparison between the ancient methodology to design the machine foundation and the new developed technologies or analytical methods.
The response of soil also plays importance part in the design process of foundation. Tripathy discussed foundation turbo generator is very important for power generation, gas ,steam, hydra, geo thermal and nuclear power plants a very less research was carried out on this topic in this Winkler spring soil model solid finite element modeling and dynamic analysis of turbo generator was carried out the frequency ,stiffness and dumping for various modes are found out by using SAP - and the dynamic effect of foundation was analysis and the interpretation of result was compare with the text book of machine foundation.
Kumar discussed the damping and various type of soil, theoretical process was use base on elastic half spare theory to calculate the soil stiffness, shear wave velocity. The result was presented by using dimension less graph.
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Reciprocating engine mounted over base frame.Ip ck for static analysis. Determination of density of soil in-place by rubber-balloon method. Psycotherapy incl. Beams that 4. Determination of the shear strength parameters of a specimen tested in unconsolidated undrained triaxial compression without the measurement of pore water pressure.
The highest natural frequency calculated should be at least 10 percent higher than the operating frequencyofthe machine. Start on. Stepper vs. Reciprocating engine mounted over base frame. Data Protection definitions Personal data Personal data is any information relating to a living individual who can be
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