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Under tension loading, the concrete cone failure surface has 45° inclination. A constant distribution of tensile stresses is then assumed. The concrete cone failure load N 0 {\displaystyle N_{0}} of a single anchor in uncracked concrete unaffected by edge influences or overlapping cones of neighboring anchors is given by: [ 2 ]
This is a list of structural failures and collapses of buildings and other structures including bridges, dams, and radio masts/towers. This is a dynamic list and may never be able to satisfy particular standards for completeness.
For this reasons, the size effect on the strength in brittle failures of concrete structures and structural laminates has long been ignored. Then, however, the failure probability, which is required to be < 10 − 6 {\displaystyle <10^{-6}} , and actually does have such values for normal-size structures, may become for very large structures as ...
Structural failure during guy wire tension testing KXJB-TV mast, Galesburg, North Dakota: February 14, 1968: Guyed steel lattice mast 628 Helicopter collision WLBT Tower, Raymond, Mississippi: March 3, 1966: Guyed steel lattice 487 F5 tornado: Replaced with 609.3 m tower which collapsed in 1997 KBIM-TV, at Caprock, New Mexico April 1, 1966 ...
The concrete slabs were only 8 inches (200 mm) thick and should have been 11 inches (280 mm) thick to satisfy the American Concrete Institute's Building Code minimum. The plastic chair spacers used to support the slab steel were 4 + 1 ⁄ 4 inches (110 mm) high (not high enough to match the design intent), which coupled with the thin slabs led ...
The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or Abrams cone, that is open at both ends and has attached handles.The tool typically has an internal diameter of 100 millimetres (3.9 in) at the top and of 200 millimetres (7.9 in) at the bottom with a height of 305 millimetres (12.0 in).The cone is placed on a hard non-absorbent surface.
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Arlington County investigated the 1968 incident and blamed the accident on insufficient wooden shoring to hold up concrete being poured to form the floor above it. [3] Martin Lowton, 56, of Alexandria, Virginia, was inside the Skyline Plaza Tower 1 when it collapsed in 1973. He huddled under a fourth-floor staircase as concrete fell around him.