#### Theory of Structures: What You Need to Know

The theory of Structures is a critical field of engineering that every engineer should be familiar with. It's the study of how forces are distributed in structures, and it's essential for designing safe and effective bridges, buildings, and other structures. In this blog post, we will discuss the basics of the Theory of Structures and what you need to know to be successful in this field!

Every structure, whether it is a bridge, a building, or any other type of man-made object, is subject to forces. These forces can come from many sources, such as the weight of the structure itself, the weight of people or vehicles using the structure, wind, and earthquakes. The theory of Structures is the study of how these forces are distributed throughout a structure, and how they interact with one another.

#### Applications of Theory of Structures

Engineers use the Theory of Structures to determine the strength and stability of structures. This information is used to design safe and effective bridges, buildings, and other structures. The theory of Structures is also used to assess the safety of existing structures. When a structure is damaged, engineers use the Theory of Structures to determine if the damage is serious enough to pose a risk to the public.

#### Types of Structures

There are two main types of structures: load-bearing and non-load-bearing. Load-bearing structures, such as bridges and buildings, support their own weight as well as the weight of people or vehicles using them. Non-load-bearing structures, such as fences and walls, do not support any weight other than their own.

Load-bearing structures are more complex than non-load-bearing structures, and as a result, they require more careful analysis. The theory of Structures is used to determine the loads that a structure can safely support, as well as the distribution of those loads throughout the structure. The theory of Structures is a critical field of engineering that every engineer should be familiar with.

Following are some of the multiple choice questions on the **Theory of Structures** with answers that will help the students in developing their knowledge.

## Theory of Structures MCQ

### 1. The deformation per unit length is called

### 2. What is the unit for stress?

### 3. The ratio of stress and strain is known as

### 4. The ability of the material to deform without breaking is called

### 5. In a composite body, consisting of two different materials………..will be same in both materials.

### 6. Maximum shear stress theory for the failure of a material at the elastic limit, is known

### 7. The limit beyond which the material does not behave elastically is known as

### 10. When tensile stress is applied axially on a circular rod its

### 11. The shape factor of standard rolled beam section varies from

### 12. The equivalent length of a column of length L, having both the ends hinged, is

### 13. A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is

### 15. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

### 16. If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span,

### 17. Two parallel, equal and opposite forces acting tangentially to the surface of the body is called as

### 18. A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be

### 19. Slenderness ratio of a long column, is

### 20. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix

### 21. A wall designed to resist the lateral displacement of soil or other materials

### 22. A beam having both ends restrained against translation and rotation. The fixed ends transfer bending stresses, increase the rigidity of the beam and reduce its maximum deflection.

### 23. In RC beams, which portion is under compression?

### 24. Complex of columns, beams, girders, spandrels, and trusses connected to one another and to the columns anchored in a foundation

### 25. A slight convex curvature intentionally built into beam, girder, or truss to compensate for an anticipated deflection

### 26. If the slab is permanently exposed to the ground, minimum concrete cover is ______ clear.

### 27. The length of a wire is increased by 1 mm on the application of a certain load. In a wire of the same material but of twice the length and half the radius, the same force will produce an elongation of

### 28. Strain is a dimensionless quantity.

### 29. Which stress is induced in a member, when expansion or contraction due to temperature variation is prevented?

### 30. The bending stress in a beam is __________ bending moment

### 31. When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed.

### 32. Materials most often used to construct load-bearing walls in large buildings

### 33. A wall that bears the weight of the house above said wall, resting upon it by conducting its weight to a foundation structure

### 34. There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of

### 35. The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is

### 36. H V are the algebraic sums of the forces resolved horizontally and vertically respectively, M is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon

### 37. For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is

### 38. The maximum deflection of a simply supported beam of span L, carrying an isolated load at the centre of the span; flexural rigidity being EI, is

### 39. The assumption in the theory of bending of beams is:

### 40. The ratio of the deflections of the free end of a cantilever due to an isolated load at 1/3rd and 2/3rd of the span, is

### 41. The use of ___________ in flat slabs increase the shear strength of slab and reduce the moment in the slab by reducing the clear or effective span

### 42. In plastic analysis, the shape factor for a circular section, is

### 43. P = 4π² EI/L² is the equation of Euler's crippling load if

### 44. The ratio of maximum shear stress to average shear stress of a circular beam, is

### 45. The locus of reaction of a two hinged semi-circular arch, is

### 46. Maximum principal stress theory for the failure of a material at elastic point, is known

### 47. Total strain energy theory for the failure of a material at elastic limit, is known

### 48. A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 × 106 kg/cm², the side of the rod, is

### 49. The equivalent length is of a column of length having both the ends fixed, is

### 50. A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is

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