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BAMBOO CONSTRUCTION GOURAV YADAVSEC. B141504391INTRODUCTION

Bamboo has been in wide usage since ancient times as a low cost material for houses, bridges etc. Recently started appearing in designer homes as flooring, walling and panelling material.Is viewed as a a material preferred only by the poor or for temporary construction.Unpopular in conventional construction due to low durability, lack of structural design data , exclusion from building codes etc. ADVANTAGES

Bamboo is an extremely strong natural fibre , on par with standard hardwoods, when cultivated , harvested, prepared and stored properly.Bamboo is highly flexible. During its growth ,it may be trained to grow in unconventional shapes .It has a great capacity for shock absorption, which makes it particularly useful in earthquake prone areas.

Important facts

Bamboo is a perennial grass and not a tree as is commonly perceived.The strongest part of bamboo stalk is its node , where branching occurs.One of the fastest growing plant on earth . Its growth rate ranges from 30 cm to 1 m is 24 hours.1450 species are found in diverse climates across the world , however , not all of these are suitable for construction.HOW TO PROTECT BAMBOO

UNTREATED BAMBOOUNTREATED BAMBOO HAS THE FOLLOWING LIFE SPANS IN DIFFERENT CONDITIONS.EXPOSURE TO SOIL AND ATMOSPHERE = 1-3 YEARS UNDER COVER =4-7 YEARS .VERY FAVOURABLE CONDITIONS=10-15 YEARS NATURAL DURABILITY ALSO DEPENDS ON THE SPECIES OF THE BAMBOO.

DURING THE CASTING AND CURING OF CONCRETE, REINFORCING BAMBOO ABSORBS WATER AND EXPANDS.THE SWELLING OF BAMBOO PUSHES THE CONCRETE AWAY .THEN AT THE END OF THE CURING PERIOD , THE BAMBOO LOSES THE MOISTURE AND SHIRNKS BACK ALMOST TO ITS ORIGINAL DIMENSIONS LEAVING VOIDS AROUND ITSELF.THE SWELLING AND SKRINKAGE OF BAMBOO IN CONCRETE CREATES A SERIOUS LIMITATIONS IN THE USE OF BAMBOO AS A SUBSTITUTE FOR STEEL IN CONCRETE.BAMBOO PILES

BAMBOO COMPACTS SOFT SOIL ,THUS INCRESING THE BEARING CAPACITY OF SOIL.THE FRICTION PROVIDED BY THE CONSTRUCTION-GRADE BABOO INCREASES ITS LOAD BEARING CAPACITY.TREATED SPLITS BAMBOO PILES 8M LONG AND 80-90MM IN DIAMETER WERE FILLED WITH COCONUT COIR STRANDS WRAPPED WITH JUTE.RESISTANCE TO EARTH QUAKESHIGH RESIDUAL STRENGTH TO ABSORB SHOCKS AND IMPACTS.FLEXURE COUPLED WITH ITS VERY LOW MASS.PROTOTYPE HOUSE BUILT WITH BAMBOO SHEET ROOFING AND BAMBOO REINFORCED CONCRETE WALLS WITHSTOOD A STIMULATED EARTHQUAKE MEASURING 7-8 ON THE RICHTER SCALE

MECHANICAL PROPERTIESPROPERTYVALUEDENSITY0.5 0.9 gm/ccCOMPRESSIVE STRENGTH53 100 MPaTENSILE STRENGTH111 219 MPaBENDING STRENGTH86 229 MPaBENDING ELASTICITY6882 20890 MPaCOLUMN AND BEAM

LIMITATIONS AND DRAWBACKSFEW CONSIDERATIONS CURRENTLY LIMIT THE USE OF BAMBOO AS A UNIVERSALLY APPLICABLE CONSTRUCTION MATERIAL JOINTING TECHNIQUE ALTHOUGH MANY TRADITIONAL JOINT TYPES EXIST, THEIR STRUCTURAL EFFICIENCY IS LOW. CONSIDERABLE RESEARCH HAS BEEN DIRECTED AT THE DEVELOPMENT OF MORE EFFECTIVE METHODS.FLAMMABILITY BAMBOO STRUCTURE ARE NOT FIRE- RESISTANT, AND THE COST OF TREATMENT, WHERE AVAILABLE, IS RELATIVITY HIGH.LACK OF DESIGN GUIDANCE AND CODIFICATION THE ENGINEERING DESIGN OF BAMBOO STRUCTURES HAS NOT YET BEEN FULLY ADDRESSED. THERE IS LITTLE OR NO DATA CONTAINING SPECIFICATION OF BAMBOO.