Earthquake Evaluation

CHAPTER NO: - 1 INTRODUCTION

1.1GENERAL

1.1.1 Seismic evaluation

An approved process or methodology of evaluating deficiencies in a building prevents the building from achieving life safety objective. There are many buildings which do not meet the current seismic requirement and suffer extensive damage during the earthquake. Evaluating the building for seismic conditions give an idea whether the building is able to resist the earthquake load or not. The objective is to evaluate an existing building for earthquake performance. Firstly preliminary evaluation is done and then detailed evaluation is carried out.

A. Preliminary evaluation

In Preliminary quick check the building for potential deficiencies and to assess the characteristics

These are the most important factor that is considered in building. From that the evolution of seismic performance of building is obtained. Most of the reinforced concrete (RC) structures are not designed to resist major or moderate earthquakes. Thus these buildings are vulnerable during the event of an earthquake..In present study bare frame and soft storey are modeled considering special and ordinary moment resisting frame (SMRF & OMRF) for medium soil profile under zone V. The masonry infill panels were modeled as equivalent diagonal strut G+6 storey buildings are considered to represent medium and high rise buildings , response spectrum analysis was performed on bare frame, infill frames as brick and infill frame as solid concrete block using SAP 2000 V15 software. Nonlinear static pushover analysis carried out for default-hinge properties, M, PM, V and P hinges are applied to beam, column and strut in some programs based on the FEMA-356 and ATC-40 guidelines. While such documents provide the hinge properties for several ranges of detailing, programs may implement averaged values. The performance of building frames were compared with bare frame, in terms of ductility, safety, and

Role of IS code in seismic design

According to the IS 456-2000, IS 1893 -2002, IS 13920 the safe design of building is done during the earthquake. For this the role of these code on the structure is determine.

Is 456: 2000

This code provides the standard deals with the general structural use of Plain and reinforced concrete. This code gives the provision of reinforcement in structural member like beam, column and slab. And also gives the criteria of concrete grade to be provided

Is 1893 (Part-1): 2002

This code considered the criteria for earthquake resistant design of structure. This Indian standard was adopted by the Bureau of Indian standards draft finalized by the Earthquake engineering sectional committee had been approved by the civil engineering division council. This code includes the general provision which is provided in building like damping, Liquefaction, Ductility, Diaphragm etc are considered. Criteria for providing these are considered.

Is 13920: