Friday 12 February 2016
Wednesday 10 February 2016
PREPARATION OF BAR BENDING SCHEDULE (BBS)
Preparation of Bar Bending Schedule
Bar bending schedule (or schedule of bars) is a list of reinforcement bars, vis-à-vis, a given RCC work item, and is presented in a tabular form for easy visual reference. This table summarizes all the needed particulars of bars – diameter, shape of bending, length of each bent and straight portions, angles of bending, total length of each bar, and number of each type of bar. This information is a great help in preparing an estimate of quantities.
Figure 1 depicts the shape and proportions of hooks and bends in the reinforcement bars – these are standard proportions that are adhered to:
(a) Length of one hook = (4d ) + [(4d+ d )] – where, (4d+ d ) refers to the curved portion = 9d.
(b) The additional length (la) that is introduced in the simple, straight end-to-end length of a reinforcement bar due to being bent up at ø⁰ say 30o to 60o, but it is generally 45o) = l1 – l2= la
Where,
Fig: Hooks and bends in Reinforcement
Giving different values to Ø (=30⁰, 45⁰ and 60⁰ respectively), we get different values of la, as tabulated below:
Figure 2 presents the procedure to arrive at the length of hooks and the total length of a given steel reinforcement.
Fig: Typical Bar Bending Schedule
Sunday 7 February 2016
AutoCAD - A Complete guide for beginner to expert
AutoCAD is a commercial software application for 2D and 3D computer-aided design (CAD) and drafting — available since 1982 as a desktop application and since 2010 as a mobile web- and cloud-based app marketed as AutoCAD 360.
Developed and marketed by Autodesk, AutoCAD was first released in December 1982, running onmicrocomputers with internal graphics controllers. Prior to the introduction of AutoCAD, most commercial CAD programs ran on mainframe computers or minicomputers, with each CAD operator (user) working at a separategraphics terminal.
AutoCAD is used across a wide range of industries, by architects, project managers, engineers, graphic designers, and other professionals. It is supported by 750 training centers worldwide as of 1994.
As Autodesk's flagship product, by March 1986 AutoCAD had become the most ubiquitous CAD program worldwide. Source...wikipedia
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