1.Choice

1.Choice - Components of a Structure Theory and Design of...

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Theory and Design of Structures I Choice of Structure Components of a Structure The fundamental objective of structural design is the enclosure of space for human activities How to bridge a horizontal gap? Span as governing factor Structures are designed to carry loads Vertical load: • Dead load (DL): Own weight (esp. long spans) Other DL • Live load (LL): Occupants, furniture, etc Horizontal load: • Wind, earthquake, machinery, etc. Basic concepts Bending moment (BM) Basic concepts Shear force (SF) • Internal forces
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Post-and-beam structure Post-and-beam structure Stone: strong in compression; weak in tension Timber: compressive strength tensile strength; not very strong Steel: compressive strength tensile strength; strong Reinforced concrete (RC): concrete in compression steel in tension Simply-supported vs. continuous Simply-supported vs. continuous Advanced Bending in beams Bending in beams
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Cables Very LARGE lever arm Advanced Cables S A suspended cable. R V L R H R H R V Cables A typical suspension bridge. Main cables Tower/ pylon Deck Anchorage Hanger/ suspender Anchorage Pier Cables Cables Suspension roof with parallel cables, anchored to the ground. Suspension roof with parallel cables, anchored to banked seats. Cables Suspension roof with radial and circumferential cables. Outer ring in compression Inner ring in tension
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Cables Advanced Cables Suspension roof with parallel suspension cables, supported by crossed arches. Compare with a badminton racket! Arches The linear cable and the linear arch Linear arch Linear cable The parabolic cable and the parabolic arch. The stiffening beam helps to spread the live load so that it is uniformly loaded along its span Parabolic cable Parabolic arch Arches Comparison between the Gothic arch and the Roman semicircular arch Roman semi- circular arch Gothic arch A typical arch bridge
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1.Choice - Components of a Structure Theory and Design of...

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