RCC Chimney – Part 3

Construction process and design steps of RCC chimney Design procedure : Dead load of chimney ( Shell weight, lining weight, platform weight, corbel and ring beam, ladder weight) Along wind analysis Gust response factor which accounts for the sudden increase of wind for a period of time. Steady (drag coefficient, air resistance by material) and

RCC Chimney – Part 2

Components of RCC Chimney Ladder Vertical ladder runs throughout with platforms provided. Platform Quarter platform at every 10 m interval Full platform ( 360 degree ) at every 30 m interval Railing to be provided at all platforms Hangings provided in platforms for painting and maintenance purposes. Cutouts Door openings at bottom level Cutout at

RCC Chimney – Part 1

Function of chimney: Chimneys are tall slender structures which fulfill an important function. A chimney is a means by which waste gases are discharged at a high enough elevation so that after dilution due to atmospheric turbulence, their concentration and that of their entrained solid particulates is within acceptable limits on reaching the ground. Reinforced

Circular Steel Silo – Part 4

Load calculation as per Indian standards Horizontal pressure calculation Gravitational forces on substances give rise to horizontal pressure. Pressure greater at bottom than the top. Pressure increases with depth If silos contain powdery materials. Homogenization as per IS 9178 considered. As per IS 9178 P-1, Variation of pressure along depth, PI (Z) = (Ph)max *

Circular Steel Silo – Part 3

Supporting system with ring beam resting on tie beam is commonly adopted system as it offers more stiffness, shorter load paths , resistance against torsion and lateral loads. Loads acting on silo Bin wall Horizontal Load (Ph) – creates Hoop Tension on the sides of wall Vertical Load (Pv) – acts on the cross sectional

Circular Steel Silo – Part 2

Construction sequence Steel plates are bolted or welded together Cone (hopper) is usually divided into sections which usually consist of four sheets (marked 1 A-B,  1 B-C) welded or bolted together. Smaller section of cone is usually a whole section. The cone is assembled together. The steel plates and cones are assembled together and placed

Circular Steel Silo – Part 1

What is a silo? A silo is a structure for storing bulk materials. Silos are used in agriculture to store grain (see grain elevators) or fermented feed known as silage. Silos are commonly used for bulk storage of grain, coal, cement, carbon black, woodchips, food products and sawdust. Criteria for selection of silos : Geometry

Glulam

How much span can a timber structural element be made? How much load can it withstand? History of Glulam The first industrial patented use for glulam was in Weimar, Germany. In 1872, Otto Hetzer set up a steam sawmill and carpentry business in Kohlstrasse. Beginning in 1892, he took out a series of patents, including

Timber Structures

History of timber structures: Primitive shelters belonging to Peking Man existed in what is now China more than 3,00,000 years ago. Evidence has been found that in Neolithic China people learned to construct “nest residences” from branches and thatch, mostly built over a shallow pit or on a platform of poles. Wigwams are what the

Composite Column

Composite columns are constructed using various combinations of structural steel and concrete in an attempt to utilize the beneficial properties of each material. As per Clause 6.7 EC4-1.1 the composite column is mainly subjected to compression. There is no Indian code for composite columns. Composite column increase strength and stiffness due to reduction in slenderness,