Techniques to resist Earthquake Active & Passive system Shear walls Bracing Dampers Rollers Isolation Light weight material Bands Others 5
Active System Active control systems are devices integrated with real-time processing evaluators for improved service and safety . 6 Pass ive System Passive control systems are conventional devices to resist or absorb the energy produced during Earthquake. For example: Viscous Dampers
Inertial Forces 7
Shear Walls Resist; Gravity Loads Lateral Loads 8
Shear Wall 9 March 3, 1985 Earthquake (Chile) Shear Wall performed very well
Bracing 10 Link Beams Diagonal Cross Chevron Eccentric
Bracing 11
Bracing 12
Cross Bracing 13
Dampers 14
Liquid Tuned Mass Damper 15 One Rincon Hill, San Francisco
Haunches In case of Joint failure, Use High strength concrete Increase section near joints Provide haunches. 25
Light weight material In recent times, many new systems and devices using non-conventional civil engineering materials have been developed, either to reduce the earthquake forces acting on a structure or to absorb part of seismic energy. 26
Suggestions 27 Source: www.eec.edu.pk
Suggestions 28 Source: www.eec.edu.pk
Avoid Hammering & Pounding 29
Suggestions Avoid weak column and strong beam design Provide thick slab which will help as a rigid diaphragm Provide cross walls which will stiffen the structures Provide shear walls in a symmetrical fashion Increase in the transverse (Shear) reinforcement. Horizontal lintel band should be provided Revision/ updation of building code of Pakistan The building must be regular and symmetrical in shape Reinforcing bars should be provided at the corners and the junctions of the walls 30