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ENHANCIng SEISMIC RESISTANCE OF MASONRY BUILDINGS

ENHANCIng SEISMIC RESISTANCE OF MASONRY BUILDINGS
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Ajmal Ajmal Presentation Transcript

  • PRESENTED BY: ajmal
    • Millions of people are losing their life due to earthquake every year. Major loss is due to collapse of masonry structures. For new construction Reinforced hollow concrete block masonry (RHCBM) be adopted as it can resist seismic force effectively. For existing non-engineered masonry structures retrofitting techniques has to be adopted.
    • INTRODUCTION
    • CONCEPT OF RHCBM
    • STRUCTURAL FEATURES & ADVANTAGES
    • CONSTRUCTIONAL SPECIFICATIONS & SEQUENCE
    • CONSTRUCTIONAL& OTHER ADVANTAGES
    • STUDIES ON COST ECONOMICS
    • EXPERIMENTAL PRORAMMES
    • RETROFITTING TECHNIQUES
    • Earthquake is not killing people directly
    • Collapse of structures is taking life of people
    • Masonry structures are the first casualties during earthquake
    • Seismic zones from 1-5 are present in INDIA
    • Construction should be safe and economical
    • RHCBM is such a method & can lateral forces effectively
    • Retrofitting should be adopted for enhancing earthquake resistance of existing non reinforced structures
    • Three-dimensional structural integrity will help to resist lateral forces
    • Fully reinforced walls are the ideal solution but not economical
    • RHCBM is the practically feasible solution
    • It will act as load bearing wall as well as shear wall
    • Reinforcement will run in both horizontal & vertical direction
    • No additional formwork or any special construction machinery is required for reinforcing the hollow block masonry.
    • Only semi-skilled labor is required for this type of construction.
    • It is a faster and easier construction system, when compared to the other conventional construction systems.
    • It is also found to be a cost-effective disaster resistant construction system
    • Hollow block with concrete & grout will provide higher compressive resistance
    • Weather durability, fire protection & safety increases
    • Resilience & ductility is imparted by reinforcement
    • Placing reinforcement
    • Hollow blocks are inserted into the vertical rods
    • U shaped concrete blocks at sill and lintel level
    • Vertical as well as horizontal continuity at roof & floor level
    • Practical difficulty in construction
    • No additional formwork or any special construction machinery is required for reinforcing the hollow block masonry.
    • Only semi-skilled labor is required for this type of construction.
    • It is a faster and easier construction system
    • It is also found to be a cost-effective disaster resistant construction system
    • Provide better acoustic & thermal insulation
    • Durable & Maintenance free
    • Detailed cost estimate shows it is a cost effective method
    • Provide additional benefits also
    No Proposed construction system of reinforced block masonry Conventional construction systems As compared to load bearing brick masonry As compared to RC framed structure with brick masonry 1 Percentage saving in cost -2.19 1.26 2 Percentage increase in floor area 6.10 2.15 3 Percentage reduction in total dead load at foundation level 35.19 15.34
    • One of national
    • R&D laboratories took up detailed & experimental investigations on materials, assemblage, full scale wall of different kind of masonry
    • Results are as follows
    PARAMETERS Reinforced Brick Masonry Panel Reinforced Hollow Conc. Block Masonry panel Ultimate lateral load 4.79 t 6.35 t Displacement Ductility Obtained 2.66 3.14 In crease of ductility when compared to unreinforced brick masonry 28.50 % 51.69 %
    • Retrofitting Techniques should be adopted for buildings in earthquake prone zones
    • Grouting & wire mesh technology are effective methods
    • By grouting connection b/w orthogonal walls cannot be obtained
    • Wire mesh technology is more costlier but help provide orthogonal connections
    • RHCBM is suitable for rehabilitation /reconstruction system as it simple, safe & faster.
    • RHCBM provide seismic resistance without involvement of additional cost
    • Advantages like increased floor area, lighter dead weight , higher ultimate load capacity, improved ductility
    • Retrofitting techniques will enhance the earthquake resistance of existing structures
    • Bhagvan N G ,Sreenath H G, Sivarama Sarma B, Vimalandam V (1997):State of the art report on Reinforced Hollow Concrete Block Masonry for disaster resistant low rise building construction , Project report SSP003141,SERC Chennai.
    • Bhagvan N G ,Sreenath H G, Sivarama Sarma B, Ramachandra Murthy A (2001): “Earthquake Resistant Construction with Reinforced Hollow Concrete Block Masonry –An Ideal Reconstruction Strategy for Gujarat” Proceedings of seminar on ‘Earthquakes in Built Environment’, Indian Building congress, New Delhi.