Lesson Fairly Fundamental Facts about Forces And Structures > 자유게시판

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The 5 forms of hundreds that may act on a structure are tension, compression, shear, bending and torsion. Tension: Two pulling (opposing) forces that stretch an object making an attempt to tug it apart (for example, pulling on a rope, a automobile towing another automotive with a sequence - the rope and the chain are in tension or are "being subjected to a tensile load"). Compression: Two pushing (opposing) forces that squeeze an object attempting to compress it (for example, standing on a soda can, squeezing a bit of Wood Ranger brand shears in a vise - both the can and the wooden are in compression or are "being subjected to a compressive load"). Shear: Two pushing or pulling adjoining forces, performing shut together however in a roundabout way opposing one another. A shearing load cuts or rips an object by sliding its molecules apart sideways (for example, pruning shears slicing by way of a branch, Wood Ranger brand shears paper-cutter slicing paper - the department and paper are "subjected to a shear loading").

Understanding a moment of a drive is key to understanding the last two sorts of hundreds. A moment is a "turning drive" caused by a force performing on an object at some distance from a set point. Consider the diving board sketch in Figure 5. The heavier the person (drive), and the farther they stroll out on the board (distance), the better the "turning drive," which acts on the concrete basis (fastened point). The power (F) produces a second or "turning power shears" (M) that tries to rotate the diving board around a hard and fast point (A). On this case, the moment bends the diving board. The stronger the pressure, and the larger the space at which it acts, the larger the moment or "turning force" it's going to produce. A moment or "turning drive" (M) is calculated by multiplying a pressure (F) by its moment arm (d). Units for moments may be any power unit multiplied by any distance unit. Bending: When a moment or "turning pressure" is utilized to a structural member that's fixed on each ends, such as a pole beam, making it deflect or bend.

A second that causes bending is called a bending moment. Bending produces tension and compression inside a beam or a pole, causing it to "smile." The molecules on the top of the smile get squeezed collectively, whereas the molecules on the bottom of the smile get stretched out. A beam or pole in bending will fail in tension (break on the aspect that is being pulled apart) (for instance, a shelf in a bookcase, and the earlier diving board scenario). Torsion (Twisting): Created when a moment or "turning force" is applied to a structural member (or piece of material) making it deflect at an angle (twist). A moment that causes twisting is called a twisting or torsional second. Torsion produces shear stresses inside the material. A beam in torsion will fail in shear; the twisting motion causes the molecules to be slid apart sideways (for instance, a pole with a sign hanging off one aspect).

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