Analytical Assessment of an Irregular RD Full Scale 3D Test Structure

Jeong, Seong-Hoon; Elnashai, Amr S.

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Description

Title

Analytical Assessment of an Irregular RD Full Scale 3D Test Structure

Author(s)

• Jeong, Seong-Hoon
• Elnashai, Amr S.

Issue Date

2004-03

Keyword(s)

• Mid-America Earthquake (MAE) Center
• Reinforced concrete

Abstract

The advancement of seismic assessment of structures depends on three main ingredients, namely advanced and well-controlled testing techniques, accurate analytical simulations and the existence of measured data for verification. Recent advancements in testing and analysis are welldocumented, and the literature abounds with simulation approaches, both physical and computational. However, real data from the seismic performance of structures of the required characteristics and at the sought after limit states is severely lacking. This is a consequence of the very limited number of full scale tests conducted around the world; such tests are in the range of 10 or so for the wide class of reinforced concrete structures (Rossetto and Elnashai, 2003). With regard to data collected after earthquakes, the quality of observations is subject to the following considerations: a. The number of structures with light damage is significantly larger than the number of cases of partial and total collapse. Therefore, the statistical viability of the latter is at best questionable. b. It is unlikely that the building stock subjected to earthquake motion is that which is being investigated by researchers; i.e. work on dual frame-wall structures require data on seismic response of the same system, preferably designed to the same criteria. c. Design and construction practices are regional, hence damage data from one region may not be transferable due to ‘supply incompatibilities’. d. Ground motion characteristics are also regional thus limiting the transferability of damage data due to ‘demand incompatibility’. The above discussion lends weight to allocating resources to full scale testing as possibly the most promising and controlled means of obtaining structural performance data under earthquake loading for the verification of structural systems, the further development of testing procedures and the calibration of analytical models. In this context, a full scale test of a 3 story 2×2 bays irregular reinforced concrete structure was carried out at the European Laboratory for Structural Assessment (ELSA) of the Joint Research Center (JRC) in Ispra, Italy, under the auspices of the EU project Seismic Performance Assessment and Rehabilitation (SPEAR). As part of the aforementioned project, this report presents detailed seismic assessment of the building and pretest. The main objectives are to aid in refining the test details, defining the sequence of testing, selecting the most suitable input motion record and the intensity that will cause the structure to reach the desired limit state. Numerical simulations are performed for pre-test condition assessment of the specimen, estimation of the actuator motion during the test and determination of the weight locations. Below, full structure-, story- and member-level seismic assessment of the test model is described. Pre-test models with different assumptions are presented and their analysis results are compared with the experimental result.

Series/Report Name or Number

MAE Center CD Release 04-03

Type of Resource

text

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National Science Foundation EEC-9701785

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