An ____________ is in a pure compression form.(a) arch(b) hinge(c) rigid(d) trussThe question was asked in quiz.The origin of the question is Roof Covering, Sloping Roof & Flat Terraced Roof topic in division Rules and Methods of Measurement of Civil Engineering Drawing

An ____________ is in a pure compression form.(a) arch(b) hinge(c) rig

1.	An ____________ is in a pure compression form.(a) arch(b) hinge(c) rigid(d) trussThe question was asked in quiz.The origin of the question is Roof Covering, Sloping Roof & Flat Terraced Roof topic in division Rules and Methods of Measurement of Civil Engineering Drawing
Answer» Correct OPTION is (a) arch To elaborate: It can span a large area by resolving forces into compressive stresses and, in TURN eliminating tensile stresses. This is sometimes referred to as arch ACTION. As the forces in the arch are carried to the ground, the arch will PUSH outward at the base, called thrust. As the rise, or height of the arch decreases, the outward thrust increases. In order to maintain arch action and prevent the arch from collapsing, the thrust needs to be restrained, either with internal ties or EXTERNAL bracing, such as abutments.

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