Monthly Archives: July 2014

Basics of Flat Plate Floor System – Advantages & Disadvantages

Flat Plate The flat plate is a two-way reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. Flat Plate System Introduction A flat plate is a one- or two-way system usually supported directly on columns or load bearing walls. It is one of the most common forms of construction… Read More »

Flat Slab Floor System. Advantages and Disadvantages of Flat Slabs

Flat Slab Floor System. A flat slab is a one-way or two-way system with thickenings in the slab at the columns and load bearing walls called ‘drop panels’ Figure 9. Drop panels act as T-beams over the supports. They increase the shear capacity and the stiffness of the floor system under vertical loads, thus increasing… Read More »

What is Punching Shear? Punching Shear in Flat Slabs

What is Punching Shear? Punching shear is a type of failure of reinforced concrete slabs subjected to high localized forces. In flat slab structures this occurs at column support points. The failure is due to shear. This type of failure is catastrophic because no visible signs are shown prior to failure. Punching shear failure disasters… Read More »

Various Types of In-situ Concrete Floor Systems

Various Types of In-situ Concrete Floor Systems There are many concrete floor systems from which the designer can select an economical and technically satisfactory solution. Introduction Traditionally, concrete floor systems are reinforced using bars, fabric or using high-strength strand which is stressed. The action of prestressing with a straight or a draped cable in concrete… Read More »

Spalling of Concrete – Causes, Prevention & Repair

Spalling of Concrete – Causes, Prevention & Repair ingress of moisture of air into concrete causes corrosion of reinforcement and results in the volume expansion of steel bars, consequently causing cracks & spalling of concrete cover The word Spall in engineering, describes the chips or fragments of a material that is broken off a bigger… Read More »

Diagonal Cracks in Foundation and Walls

Diagonal Cracks in Foundation and Walls Diagonal cracking is an inclined crack beginning at the tension surface of a concrete member. Steep diagonal cracks appear in concrete foundation due to point loads that exceed the compressive strength of the concrete. This type of failure, known as settlement, can happen due to “volume changes in clay soils… Read More »