Wind Load Calculation as per IS 875 Part 3 2015 - PDF Download
Is 875 Part 3 2015 PDF Download: What You Need to Know
If you are involved in the design of buildings and structures that are subject to wind loads, you need to be familiar with IS 875 Part 3 2015. This is the Indian Standard for Design Loads (Other than Earthquake) for Buildings and Structures - Code of Practice Part 3 Wind Loads. It specifies the wind forces and their effects that should be taken into account when designing buildings, structures, and components thereof. In this article, you will learn what IS 875 Part 3 2015 is, why it is important, how to download it, how to use it, what are the changes from the previous version, what are the challenges and limitations of using it, how to overcome them, and what are the alternatives and supplements to it.
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What is IS 875 Part 3 2015?
IS 875 Part 3 2015 is a code of practice for design loads (other than earthquake) for buildings and structures. It is one of the five parts of IS 875, which covers different types of loads such as dead loads, live loads, snow loads, wind loads, and special loads. Part 3 deals with wind loads, which are the forces exerted by wind on buildings, structures, and their components. Wind loads vary randomly both in time and space and hence assessment of wind loads and response predictions are very important in the design of several buildings and structures. Wind loads depend on various factors such as wind speed, wind direction, terrain category, topography, shape and size of the structure, dynamic effects, etc. IS 875 Part 3 2015 provides methods for calculating wind loads based on these factors.
Why is IS 875 Part 3 2015 important?
IS 875 Part 3 2015 is important because it helps ensure the safety and stability of buildings and structures against wind-induced failures. Wind can cause various types of damage to buildings and structures such as overturning, sliding, uplift, torsion, vibration, fatigue, etc. These can lead to structural collapse, loss of life and property, disruption of services, etc. Therefore, it is essential to design buildings and structures that can withstand the expected wind loads without exceeding their strength or serviceability limits. IS 875 Part 3 2015 provides a comprehensive and consistent framework for designing buildings and structures for wind loads. It also helps in achieving economy and efficiency in design by avoiding overdesign or underdesign.
How to download IS 875 Part 3 PDF?
There are several ways to download IS 875 Part 3 2015 PDF. Here are some of them:
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You can download it from the official website of the Bureau of Indian Standards (BIS), which is the national standards body of India. You need to register and pay a nominal fee to access the PDF. You can visit this link to download IS 875 Part 3 2015 PDF from BIS.
You can also download it from some online platforms that provide access to various Indian standards for free or at a low cost. For example, you can visit this link to download IS 875 Part 3 2015 PDF from Scribd, which is a digital library and e-book service.
Another option is to download it from some academic websites that host research papers and publications related to civil engineering and wind engineering. For example, you can visit this link to download IS 875 Part 3 2015 PDF from ResearchGate, which is a social network for researchers and scientists.
However, you should be careful about the authenticity and quality of the PDFs that you download from these sources, as they may not be updated or accurate. You should always refer to the original source of the standard, which is BIS, for any official or legal purposes.
How to use IS 875 Part 3 2015 PDF?
Once you have downloaded IS 875 Part 3 2015 PDF, you can use it as a reference and guide for designing buildings and structures for wind loads. The standard has six main sections and four appendices, as shown in the table below:
Section
Title
1
Scope
2
Definitions and Symbols
3
General Design Considerations
4
Wind Speeds and Terrain Categories
5
Wind Loads on Buildings and Structures
6
Wind Loads on Components and Cladding of Buildings and Structures
A
Gust Factor Method for Determining Design Wind Loads on Buildings and Structures (Informative)
B
Wind Tunnel Testing for Determining Wind Loads on Buildings and Structures (Informative)
C
Determination of External Pressure Coefficients for Buildings with Rectangular Plan Shapes (Informative)
D
Determination of Internal Pressure Coefficients for Buildings with Rectangular Plan Shapes (Informative)
You can use the standard to determine the design wind speed for your location, based on the basic wind speed, terrain category, topography factor, and risk coefficient. You can also use the standard to calculate the design wind pressure and wind force on your building or structure, based on the shape, size, orientation, height, and dynamic response of the structure. You can also use the standard to estimate the wind loads on the components and cladding of your building or structure, such as roofs, walls, windows, doors, etc. The standard provides various tables, charts, diagrams, and formulas for these calculations. You can also use the appendices of the standard to learn about alternative methods for determining wind loads, such as gust factor method and wind tunnel testing. You can also use the appendices to find out the external and internal pressure coefficients for buildings with rectangular plan shapes.
What are the changes in IS 875 Part 3 2015 compared to the previous version?
IS 875 Part 3 2015 is the latest version of the standard for wind loads design. It was published in 2015 and it replaced the previous version, which was IS 875 Part 3 1987. The new version has several changes and improvements compared to the old version. Some of the major changes are:
The basic wind speed map of India has been revised and updated based on the latest data and research. The new map has more zones and higher wind speeds than the old map.
The terrain categories have been redefined and expanded from four to six, based on the surface roughness and obstructions. The new categories are A (open sea), B (open terrain), C (rough terrain), D (urban terrain), E (industrial terrain), and F (hilly terrain).
The topography factor has been introduced to account for the effect of hills, valleys, escarpments, etc. on the wind speed. The topography factor varies from 1.0 (flat terrain) to 1.4 (steep terrain).
The risk coefficient has been modified to account for the probability of exceedance of wind speed in a given period of time. The risk coefficient depends on the design life of the structure and the annual probability of exceedance.
The dynamic effects have been incorporated in the calculation of wind loads by using a gust factor or a gust response factor. The gust factor depends on the turbulence intensity and the natural frequency of the structure. The gust response factor depends on the damping ratio and the mode shape factor of the structure.
The external pressure coefficients have been revised and