Seismic Conceptual Design of Building

"Basic Principles for Engineers, Architects, Building Owners, and Authorities"

In an earthquake, seismic waves arise from sudden movements in a rupture zone (active fault) in the earth's crust. Waves of different types and velocities travel different paths before reaching a building’s site and subjecting the local ground to various motions. The ground moves rapidly back and forth in all directions, usually mainly horizontally, but also vertically.

What happens to the buildings? If the ground moves rapidly back and forth, then the foundations of the building are forced to follow these movements. The upper part of the building however would prefer to remain where it is because of its mass of inertia. This causes strong vibrations of the structure with resonance phenomena between the structure and the ground, and thus large internal forces. This frequently results in plastic deformation of the structure and substantial damage with local failures and, in extreme cases, collapse.

The ground motion parameters and other characteristic values at a location due to an earthquake of a given magnitude may vary strongly. They depend on numerous factors, such as the distance, direction, depth, and mechanism of the fault zone in the earth's crust (epicentre), as well as, in particular, the local soil characteristics (layer thickness, shear wave velocity).

In comparison with rock, softer soils are particularly prone to substantial local amplification of the seismic waves. As for the response of a building to the ground motion, it depends on important structural characteristics (eigen-frequency, type of structure, ductility, etc). Buildings must therefore be designed to cover considerable uncertainties and variations.

Once take care of principles (by Hugo Bachmann) as suggested in this video while designing building structures..!

Comments

SP 16 :1980 - Design Aids for Reinforced Concrete to IS:456

The structural practice handbook SP:16-1980 Design Aids for Reinforced Concrete to IS:456-1978 has tables and charts that helps structural engineers to rapidly design simple sections. Even though the design aid is based on the 1978 code, it continues to be used without revision as there have been no major changes to Section 5, on which the design aid is based. To Download II Click Here II

IS 13920 : 2016 -Ductile Design and detailing of reinforced concrete structures subjected to seismic forces-Code of practice

IS 13920 : 2016 - Ductile Design and detailing of reinforced concrete structures subjected to seismic forces-Code of practice since it was first published in 1993. Most of the older provisions have been redrafted and modified for greater clarity and new provisions have been added. Much of the this revision is based on the IITK-GSDMA document of proposed draft provisions. To Download II Click Here II

------------- Repair and Rehabilitation of Concrete Structures --------------- By, Poonam I. Modi & Chirag N. Patel

Since the subject of repairs and rehabilitation is very exhaustive and entails great complexities / varieties in terms of types of distress / deterioration, materials and techniques available for repairs and rehabilitations, it has always been a daunting task for the authors to select aspects to be covered in this book. Following sections gives the panoramic view of this book organized into six chapters: Chapter 1 (Introduction) gives quick overview and relevance of repairs and rehabilitation of structures besides outlining general scenario of prevalence of deterioration of concrete structures, broad reasons for distress in structures explaining what can go wrong with structures, and a general roadmap and steps to be followed for carrying out any structural repairs and rehabilitation. This section also defines some of the important terms that are used in this book. Chapter 2 (Distress in Structures- Serviceability and Durability...

DCP

Search This Blog