Types of steel reinforcement.


  1. Mild steel plain bar.
  2. High yield strength deformed bars(HYSD bar).
  3. TMT (Thermomechanically Treated) steel bars.
  4. CTS (Corrosion resistant steel) Bars.
  5. Steel wire fabric.
  6. Structural steel.
Mild steel plain bar:-
Mild steel bars are also known as fe250 because their steel has a yield strength of 250N / mm ^ 2. Hence mild steel bars are very ductile and are not preferred over over-yield strength default bars as their strength is low and weak bonds. Modules of elasticity of mild steel are 2 × 10 ^ 5N / mm ^ 2. Mild steel plane bars are displayed with 'Ф'.
Shown in fig. 1

Fig.1
High yield strength deformed bar.:- They are also known as HYSD bars. They have higher percentage of carbon in mild steel comperision and have higher strength than mild steel, but the yieldThey are also known as hysd bars. They have higher percentage of carbon in mild steel comperision and have higher strength than mild steel, but the yield point is not clearly defined. point is not clearly defined.
These bars are two types.
1.Hot rolled high yield strength bars.

2.Cold worked high yield strength bars.




Comments

Post a Comment

Popular posts from this blog

Design of Structures: Welded Connection

Image
INTRODUCTION The development of welding technology in 1940s has considerably reduced the riveted joint applications. Welding is the method of locally melting the metals (sheets or plates – overlapping or butting) with intensive heating along with a filler metal or without it and allowing cooling them to form a coherent mass, thus creating a joint. A typical weld showing various zones of weld is shown in Fig. 7.1. Such joints can be created to make structures, boilers, pressure vessels, etc. and are more conveniently made in steel. The progress has been made in welding several types of steels, but large structure size may impede the use of automatic techniques and heat treatment which becomes necessary in some cases. Welded ships were made in large size and large number during Second World War and failures of many of them spurted research efforts to make welding a better technology. ADVANTAGES OF WELDED CONNECTIONS The gross sectional area of the welded members is effective since the we
Read more

failure of a rivet joints

Image
Rivet Rivets are short ductile and cylindrical bars that are used for making a permanent mechanical joint. The process of forming a riveted joint is called riveting. A rivet is divided into 3 parts i.e., the head at one end, the tapered tail, and shank, The portion between the head and tail as shown in the figure. As it is a permanent joint it cannot be disassembled without the failure of the machine component. The material of rivet should be tough and ductile. They are usually made of low carbon steel, nickel steel, Brass, Aluminum, copper, etc. Physics Behind Rivetting. The main function of a rivet is to make a connection, That has the strength to prevent failure and tightness to prevent leakage. For connecting “> 2 metal plates, firstly holes are punched and reamed. The plates are then separated to remove any burrs or chips. The cylindrical cold or red-hot rivet is then inserted into the hole. Then the head is backed by a hammer or heavy bar and then the Die as shown in the figur
Read more

What is Rivet Value? and Efficiency of a rivet joint:-

Image
What is Rivet Value? It is defined as the maximum safe force one rivet can withstand. The strength of a rivet in shearing and bearing is calculated and the lesser value is taken as Rivet value. Beyond this value, the rivet will either fail in shear or will be crushed in bearing. the value of shearing and bearing strength one rivet can be calculated from the following relations:- Note :- Rivet value is least of the equations (i) and (ii) Efficiency of a rivet joint:- The original strength of a structural sheet section is reduced by rivet holes provided in it. The efficiency of a rivet joint is the ratio of the strength of riveted joint to the strength of the solid plate(Ex. strength of solid plate without rivet hole). It is denoted by  ɳ  and is expressed as percentage. The effectiveness of a particular riveted joint is measured by the efficiency. Mathematically efficiency is expressed as:                                                                            ɳ  = Strength of joint
Read more