Tension Member Sectional Area Calculation
For structural members subjected to tension, especially those with connections involving holes (like bolted connections), the effective sectional area considered for design calculations is not the total gross area.
Net Area Consideration
- The presence of rivet holes weakens the section by removing material.
- Therefore, the calculation of tensile strength must account for this reduction.
- The relevant sectional area is the net sectional area.
Net Area Definition
The net sectional area is defined as the gross sectional area of the member minus the area of the rivet holes that are intercepted by potential failure planes.
For double angles connected back-to-back to a gusset plate, the net area is used to determine the tensile capacity. This ensures the design accounts for the reduced strength due to the holes.
Thus, the sectional area considered is equal to the gross sectional area of the section minus the area of the rivet holes.
Important Questions from Tension Member
The following are the statements about lug angle used to connect heavily loaded tension member to gusset plates.
(i) The length of end connection is reduced
(ii) By using lug angles there will be saving in the gusset plate
(iii) Cost of connection increases due to additional fasteners and angle required.
A structural member subjected to tensile force in a direction parallel to its longitudinal axis is generally known as
When the length of a tension member is too long:
The allowable stress in axial tension is generally kept less if the thickness of the member is more than
A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, then what is the net effective area of the angle?
A) \(a-\frac{b}{1+0.35\times\frac{b}{a}}\)
B) \(a+\frac{b}{1+0.35\times\frac{b}{a}}\)
C) \(a-\frac{b}{1+0.20\times\frac{b}{a}}\)
D) \(a+\frac{b}{1+0.20\times\frac{b}{a}}\)
