What is Tension Member?

tension member is defined as a structural member sublected to tensile force. Tension member is also called as tie. The term tie is  commonly used for tension member in the roof truss. When a tension member is subjected to direct tension, the stress distribution on the section is uniform. But additional bending moments are induced in the member when the load on tension member is eccentric (member is subjected to combined stress i.e direct tension and bending).

*Types of Tension Member:-
                            The single structural shapes like angle and tee-sectional are normally used as tension members.
The angle sections are considerably more rigid then the rods and bars. Single angle sections are widely used as tension members in light roof trusses, bracing members(stiffners) in plate girders etc.
    
  
                    The section which is composed of two or more standard sections such as two channels placed back etc. are called as Built-up-members. These are built at site according to the design load and availablity requirement of the rolled steel sections, Built up sections are used for heavy structures.  
             The built up sections can be made stiff and more rigid than the single structural shapes. 

                The rods and bars are the simplest form of    tension member offten used for the small tension members. The round bars are treaded at the ends and are used with nuts.The area of cross-section at the roof of the thread is the net area which resist the tension.
                            Sometimes, the bars are bend to form loops at the ends instead of thread.
                    D&S_1: LESSON 8. Tension Member
 

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