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Steel

Structural Steel in project sites (Part-I)

An integral element of most construction projects is structural steel and steelwork. Few points on inspection of the same in a construction project site, especially for construction personnel with no or very less experience in this field, are briefly discussed here:

Upon arrival of structural steel at construction project site, various documents related to those, such as, material quality documents like test certificates etc., material consignment notes, purchase order copies etc. need to be carefully checked in order to ensure receipt of the proper and quality materials.

All components may be visually examined for discrepancies, such as, distortions, cracks, twists, lamination, pitting, dents, kinks, imperfect edges, straightness etc. Some of these could very well happen during handling, transportation etc. Unacceptable materials may be immediately quarantined in area demarcated for that, with records maintained.

Proper care must be taken while unloading and storing the materials. Guidelines for the same are usually specified in contract specifications or other similar documents.

For construction ( fabrication & erection ) purpose, relevant Quality Assurance & Quality Control documents, e.g., codes, specifications, job proceedures, inspection test plans, necessary QC formats, approved fabrication drawings, WPS etc. need to be in place.

Welder’s qualification in accordance with approved WPS, ASME Section IX etc. needs to be ensured prior to commencement of welding activities.

During construction, cutting, bending, grinding of structural steel are examined well as per relevant guidelines.

Fit-up & welding of structural steel members are carefully inspected as per approved drawings, codes, specifications etc.

Welds are often examined using Non Destructive Tests (NDT), such as, Dye Penetration Test or DPT etc.

Elaborate guidelines are available for mechanical testing of fillet & butt welds, such as, macro ETCH examination for fillet welds or tensile & bend tests for butt welds. These are important for checking the quality of welds. For example, in case of a butt weld, the tensile strength of weld should not be less than that of the metal on which the welding is done or no crack should show up on the weld in bend test.

Radiographic tests are also performed on welds, requiring to meet high degree of quality, as and when necessary. Welding itself is an elaborate subject and persons qualified & experienced in this field only should check important welds or welding activities. Radiographic scrutinies may be done only by qualified radiographers.

Contd. in Part-II….

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About clazcons

B. Tech. (Civil Engineering)

Discussion

One thought on “Structural Steel in project sites (Part-I)

  1. Steel Building Project with ETABS
    …………………………………………….

    Introduction

    We as civil engineers know that steel plays a big part of our professional lives. Steel is used in almost every building around the world. Why is that? Steel is popular and it is one of the most important materials used in constructing that is because steel has a very high tensile strength and is much cheaper than other materials with similar properties. Steel is a mixture of carbon and iron.

    Steels containing 0.2% C to 1.5% C are known as carbon steel. They are of three types. It contains 14% to 18% chromium and 7% to 9% nickel.

    The three types of carbon steel are :

    Low carbon steel
    Mild carbon steel
    High carbon steel
    The other types of steel are alloy steel and stainless steel.
    Why use steel?

    Steel is not only one of the strongest materials in the world today, it is the best automotive material in terms of its design flexibility, cost effectiveness, low emissions during manufacture, recyclability, and the list could go on. The typical strength of steel is 50 ksi which is a lot higher than other materials and it is much lighter as well.

    Structural steel is steel construction material, a profile, formed with a specific shape or cross section and certain standards of chemical composition and mechanical properties. Structural steel shape, size, composition, strength, storage, etc., is regulated in most industrialized countries.

    What We did in our project

    We were assigned by our Instructor to design a 12 story building with certain load combinations and we were asked to design and analyze this building.

    We used ETABS to do our software analysis, at first we chose the steel type and number of stories after that we continued and designed the slabs and walls.

    Bracing frames must be used in the perpendicular direction and frames that resist moment must be used in one direction for lateral force resisting system.

    This report contains screenshots of the work we have done in the software and also contains the manual calculations of 3 beams and 3 columns that are required to check and make sure that the values we got from ETABS are correct.

    Design loads

    Superimposed dead load: 2.5 kN/m2
    Live load: 3.5 kN/m2
    Cladding: choose suitable value
    Wind: Building located in Musaffah with 100 mph design wind speed
    Download Includes followings,

    Design Report
    ETABS Model Files
    ETABS Modelling Step by Step Video
    ETABS Project Report

    http://www.civilax.com/steel-building-project-etabs/

    Posted by Civilax Civil Engineering Community | April 1, 2015, 07:17

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