Category: Structural Design
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Proper Rebar Placement in Construction Site
We need to be careful about Rebar placement in construction site. We need to know which direction bar will be at bottom & which direction bar will be on top at the same layer of reinforcement. Placement of rebar depends on tension/bending along the direction. For example, in Spread footing more tension developed in long…
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What is the difference between thin and thick shell?
Shell problems generally fall into one of two categories: thin shell problems and thick shell problems. Thick shell problems assume that the effects of transverse shear deformation are important to the solution. Thin shell problems, on the other hand, assume that transverse shear deformation is small enough to be neglected. The inclusion of transverse shear…
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What is the mechanism for such structures?Are they safe?
We generally see a large portion of Slab is overhanged in different structure. We raise question how such large cantilever is safe? We think really these are cantilever, but actually these are not. Their mechanism is different. See the following picture: The structure is having mechanism of truss system. Slabs, inclined members & columns are…
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Advantage of Hollow Section over I Section
The only advantage of hollow section over I section is resistance against torsion. Most of the material is present away from center of mass of the section. To resist torsion we need maximum portion of material away from its center. Take the center of hollow section and draw a line away from its center and…
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Post Tensioned Slab Design
What is post tensioned slab? Post-tensioned (PT) slabs are typically flat slabs, band beam and slabs or ribbed slabs. PT slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. Longer spans can be achieved due to pre-stress, which can also be used to counteract deflections. Post tension slab is a combination of conventional slab reinforcement and additional protruding high-strength steel…
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Types, Reasons & Prevention of Column Failures
We know generally Columns are axially loaded members in structure. It carries compression force due to gravity loads of the structure. Column fails for different reasons. There are mainly three types of failures occur in columns. These are- 1.Compressive Failure 2.Buckling Failure 3.Shear Failure Now let’s discuss about the failure types in details & reason…
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Difference between Flat slab and Flat plate slab
Slab directly supported on columns without beams are called Flat slabs or flat plates. 86-Year-Old Bodybuilder Becomes Oldest to Ever Compete in Japan parabolan steroid bodybuilder cedric mcmillan dead at the age of 44 Followings are the difference between Flat slab and Flat plate slab: Serial No. Flat Slab Flat Plate Slab 1 Flat…
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Mat or Raft Foundation Design Aid
A raft foundation, also called a mat foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground. A raft foundation is often used when the soil is weak, as it distributes the weight of the…