Engineering Mechanics & Design of Steel Structures: Tension Members

By Ashutosh Yadav|Updated : August 15th, 2021

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Tension Member

Tension members are linear members in which axial forces act so as to elongate (stretch) the member. A rope, for example, is a tension member. Tension members carry loads most efficiently since the entire cross section is subjected to uniform stress. Unlike compression members, they do not fail by buckling. Ties of trusses, suspenders of cable stayed and suspension bridges, suspenders of buildings systems hung from a central core (such buildings are used in earthquake prone zones as a way of minimizing inertia forces on the structure), and sag rods of roof purlins are other examples of tension members.

Tesnsion Members in Structures

Cross Sections of Tension Members

Introduction

  1. Tension member has no stability problem.
  2. In tension, member net section will be effective whereas in compression member gross section is effective.

image001

Net Sectional Area

(i) For plate

Net area = (b x t) – nd't image002

where,

s1 = Distance between two consecutive rivets in the direction of load, also called pitch.

g1 = Distance between two consecutive rivets perpendicular to the direction of load also called gauge.

b = Width of the plate

n = Number rivets at the section

T = Thickness of the plate

d' = Gross diameter of the rivet

image003

(ii) Single angle connected by one leg only.

(a) image004

image005

where, A1 = Net cross-section of area of the connected leg.

A2 = Gross cross-sectional area of unconnected leg. (out stand)

image006

(b) image007

(c) image008

(d) image009

(e) image011

(iii) For pair of angle placed back to back (or a signal tee) connected by only one leg of each angle (or by the flange of a tee) to the same side of a gusset plate: or it the two angles are tagged along a-a.

image012

image013

where, A1 = Area of connected leg

A2 = Area of outstand (unconnected leg)

(c) The area of a web of tee = Thickness of web x (depth – thickness of flange)

(d) The outstand legs of the pair of angles should be tacked by rivets of a pitch not exceeding 1 m.

(iv) If two angles are places back to back and connected to both sides of the gusset plate. Then

image014

image015 when tack riveted.

If not tack riveted then both will be considered separately and case (ii) will be followed image007

Permissible Stress in Design

  • The direct stress in axial tension on the effective net area should not exceed σat
    where σat = 0.6fy
    and fy = minimum yield stress of steel in MPa

Lug Angle

The lug angle is a short length of an angle section used at a joint to connect the outstanding leg of a member, thereby reducing the length of the joint. When lug angle is used k = 1

 

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Ashutosh YadavAshutosh YadavMember since Jan 2020
ESE, GATE, SSC-JE and other Civil Engineering exams.
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