If the member of a structure connected does NOT lie in the same plane, then the structure is called as-
Space Truss
Understanding Truss Structures: Plane vs. Space
A truss is a structural system made up of straight members connected at their ends by joints. These members are typically arranged in triangular units. The way the members and joints are arranged determines whether a truss is classified as a plane truss or a space truss. The key difference lies in the dimensional arrangement of its components.
Analyzing the Question and Options
The question asks about a structure where the members connected do NOT lie in the same plane. Let's look at the characteristics of the options provided:
- Plane Truss: In a plane truss, all members and joints lie within a single two-dimensional plane. Loads applied to a plane truss are typically assumed to act within this same plane. Think of the trusses you might see supporting a simple roof or a bridge from the side view – they are flat structures.
- Main Truss: "Main Truss" is not a standard classification based on the spatial arrangement of members. It might refer to a primary load-carrying truss within a larger structure, but it doesn't define the structural type based on whether members are in one plane or not.
- Foot Truss: "Foot Truss" is also not a standard structural classification term like plane or space truss. It might refer to a specific part of a larger truss system or a regional term, but it does not describe the fundamental spatial arrangement of the truss members.
- Space Truss: In contrast to a plane truss, a space truss is a three-dimensional structure. Its members and joints extend in three dimensions, and the members do NOT all lie in the same plane. Space trusses are used to cover large areas, like domes, sports stadiums, or industrial buildings, and can support loads applied in any direction.
Determining the Correct Truss Classification
The question specifically states that the members of the structure connected do NOT lie in the same plane. Based on our analysis of the options:
- A Plane Truss has all members and joints in a single plane. This contradicts the question's condition.
- Main Truss and Foot Truss are not standard classifications based on the planar arrangement of members.
- A Space Truss is a three-dimensional structure where members do NOT all lie in the same plane. This perfectly matches the condition described in the question.
Therefore, if the members of a structure connected do not lie in the same plane, the structure is called a Space Truss.
Summary of Truss Types
| Type of Truss | Spatial Arrangement | Dimensionality | Example Use |
|---|---|---|---|
| Plane Truss | Members and joints in a single plane | 2D | Simple bridge, roof truss |
| Space Truss | Members and joints extend in 3D; members not all in the same plane | 3D | Domes, large span roofs |
Revision Table: Truss Structures
| Term | Key Characteristic | Relevance to Question |
|---|---|---|
| Plane Truss | All members in one plane | Does not fit the condition (members NOT in the same plane) |
| Main Truss | Not a standard classification based on planar arrangement | Irrelevant to the condition |
| Foot Truss | Not a standard classification based on planar arrangement | Irrelevant to the condition |
| Space Truss | Members NOT all in the same plane (3D) | Fits the condition described |
Additional Information on Space Trusses
Space trusses are highly efficient structures for spanning large areas with minimal internal supports. They are often used in modern architecture due to their aesthetic appeal and structural capabilities. The analysis of space trusses is more complex than plane trusses as it involves three-dimensional equilibrium equations. The joints in a space truss are often treated as pin connections, similar to plane trusses, assuming the members only carry axial forces (tension or compression). Space trusses distribute loads in multiple directions, providing rigidity and stability in three dimensions. They are typically constructed from steel or aluminum members connected by specialized nodal joints.
Important Questions from Truss
Generally purlins are placed at the panel points so as to avoid :
Assertion (A): Trusses comprise triangular figures.
Reason (R): A pin-jointed stable figure is a triangle.
What is the function of portal in bridge trusses?
Which of the following statements is true?
A. Simple trusses consist entirely of a triangle.
B. It can consists of any other shaped intermediate parts, as long as it is stable.
If a structure has a total of 10 joints, then what should be the minimum no. of joints in which equilibrium equations should be concurrently satisfied for stability?
