Seismic Capacity Requirements for Low-Rise Reinforced Concrete Buildings Comprised of Members Failing in Shear and in Flexure

2006 ◽  
Vol 324-325 ◽  
pp. 1289-1292
Author(s):  
K.S. Lee ◽  
Chang Sik Choi
Keyword(s):  
Structural Damage ◽  
Lateral Load ◽  
Seismic Evaluation ◽  
Rc Buildings ◽  
Seismic Capacity ◽  
Dynamic Analyses ◽  
Damage States ◽  
Well Damage ◽  
Interaction Curves ◽  
Nonlinear Dynamic Analyses

This paper presents a method for determining required shear and flexural strengths associated with structural damage states for various levels of earthquake demand of low-rise RC buildings having a dual lateral-load resisting system. The interaction curves of the required strengths are derived for various ductility ratios based on nonlinear dynamic analyses of the singledegree- of-freedom system. Damage states of buildings controlled by both shear and flexure are evaluated by the procedure outlined by the Japanese Standard. The proposed method predicts reasonably well damage sustained by actual buildings during an earthquake. The proposed method can be used to develop performance-based seismic evaluation and rehabilitation procedures of lowrise RC buildings having a dual lateral-load resisting system.

Implications of cumulated seismic damage on the seismic performance of unreinforced masonry buildings

2014 ◽  
Vol 47 (2) ◽  
pp. 157-170 ◽  
Author(s):  
Amaryllis Mouyiannou ◽  
Andrea Penna ◽  
Maria Rota ◽  
Francesco Graziotti ◽  
Guido Magenes
Keyword(s):  
Nonlinear Dynamic ◽  
Fragility Curves ◽  
Seismic Damage ◽  
Unreinforced Masonry ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Seismic Capacity ◽  
Building Stock ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses

The seismic capacity of a structure is a function of the characteristics of the system as well as of its state, which is mainly affected by previous damage and deterioration. The cumulative damage from repeated shocks (for example during a seismic sequence or due to multiple events affecting an unrepaired building stock) affects the vulnerability of masonry buildings for subsequent events. This paper proposes an analytical methodology for the derivation of state-dependent fragility curves, taking into account cumulated seismic damage, whilst neglecting possible ageing effects. The methodology is based on nonlinear dynamic analyses of an equivalent single degree of freedom system, properly calibrated to reproduce the static and dynamic behaviour of the structure. An application of the proposed methodology to an unreinforced masonry case study building is also presented. The effect of cumulated damage on the seismic response of this prototype masonry building is further studied by means of nonlinear dynamic analyses with the accelerograms recorded during a real earthquake sequence that occurred in Canterbury (New Zealand) between 2010 and 2012.

Procedural Assumption Comparison for Old Buildings via Pushover Analysis Including the ASCE 41 Update

2010 ◽  
Vol 26 (1) ◽  
pp. 187-208 ◽  
Author(s):  
Georgios Siahos ◽  
Stephanos Dritsos
Keyword(s):  
Plastic Hinge ◽  
Pushover Analysis ◽  
Performance Level ◽  
Safety Performance ◽  
Rc Buildings ◽  
Dynamic Analyses ◽  
Fema 356 ◽  
Nonlinear Dynamic Analyses ◽  
Seismic Tests ◽  
Story Building

The two different procedures of ASCE/SEI 41 Supplement 1 and the EC 8 based Greek Retrofitting Code (GRECO) are compared via pushover analyses for the seismic assessment of RC buildings designed to old codes. In addition, the FEMA 356 procedure is considered in order to evaluate the new provisions of ASCE/SEI 41. Results from two moderate level seismic tests performed on a four-story building are used for comparison. For the first test, all procedures overestimated the experimentally observed limited damage but GRECO was more satisfactory. For the second higher excitation test, all procedures predicted the building's high vulnerability but failed to predict the experimentally observed imminent collapse of a stiff column. In all cases, GRECO gave higher displacements. ASCE/SEI 41 and FEMA 356 predicted better the building's stiffness and gave much higher available plastic hinge rotations for beams when compared to GRECO. Concerning the columns, available plastic hinge rotations at the Life Safety performance level from the ASCE procedure were higher than GRECO, while ASCE values at the collapse prevention performance level were slightly lower than GRECO. Finally, a comparison of the above procedures with nonlinear dynamic analyses of a past earthquake is performed to identify potential pushover analysis concerns.

scholarly journals Seismic-Parameter-Based Statistical Procedures for the Approximate Assessment of Structural Damage

2014 ◽  
Vol 2014 ◽  
pp. 1-22 ◽  
Author(s):  
A. Elenas
Keyword(s):  
Discriminant Analysis ◽  
Nonlinear Dynamic ◽  
Structural Damage ◽  
Multilinear Regression ◽  
Seismic Parameters ◽  
Damage Indices ◽  
Multilinear Regression Analysis ◽  
Damage Grade ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses

This study describes two statistical methodologies to estimate the postseismic damage status of structures based on seismic parameters as novel combined procedures in earthquake engineering. Thus, a multilinear regression analysis and discriminant analysis are utilized considering twenty seismic parameters. Overall damage indices describe the postseismic damage status. Nonlinear dynamic analyses furnish the damage indices, which are considered as exact indices and references for the subsequent study. The aim is to approximate the postseismic damage indices or the damage grade of buildings using statistical methods, thus avoiding complex nonlinear dynamic analyses. The multilinear regression procedure evaluates the damage indices explicitly, and the discriminant analysis furnishes the damage grade of the structures. The proposed methods are applied to a frame structure. A set of 400 natural accelerograms is used for the training phase of the models. The quality of the models is tested initially by the same set of natural accelerograms and then by a blind prediction using a second set of synthetic accelerograms. The results of both proposed methods have shown a correct classification percentage ranging from 87.75% to 97.50% and from 70% to 90% for the sets of the natural and synthetic accelerograms, respectively.

scholarly journals Assessment of Seismic Vulnerability of Steel and RC Moment Buildings Using HAZUS and Statistical Methodologies

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Iman Mansouri ◽  
Jong Wan Hu ◽  
Kazem Shakeri ◽  
Shahrokh Shahbazi ◽  
Bahareh Nouri
Keyword(s):  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Limit State ◽  
Moment Frames ◽  
Limit States ◽  
Rc Frames ◽  
Dynamic Analyses ◽  
Damage States ◽  
Definition Of ◽  
Nonlinear Dynamic Analyses

Designer engineers have always the serious challenge regarding the choice of the kind of structures to use in the areas with significant seismic activities. Development of fragility curve provides an opportunity for designers to select a structure that will have the least fragility. This paper presents an investigation into the seismic vulnerability of both steel and reinforced concrete (RC) moment frames using fragility curves obtained by HAZUS and statistical methodologies. Fragility curves are employed for several probability parameters. Fragility curves are used to assess several probability parameters. Furthermore, it examines whether the probability of the exceedence of the damage limit state is reduced as expected. Nonlinear dynamic analyses of five-, eight-, and twelve-story frames are carried out using Perform 3D. The definition of damage states is based on the descriptions provided by HAZUS, which gives the limit states and the associated interstory drift limits for structures. The fragility curves show that the HAZUS procedure reduces probability of damage, and this reduction is higher for RC frames. Generally, the RC frames have higher fragility compared to steel frames.

scholarly journals Estimation of the Seismic Damage Potential of RC Frames Using Seismic Parameters

2022 ◽  
Author(s):  
Ali Massumi ◽  
Maryam Rahmati Selkisari
Keyword(s):  
Structural Damage ◽  
Fundamental Period ◽  
Regression Equations ◽  
Mathematical Methods ◽  
Damage Potential ◽  
Seismic Parameters ◽  
Rc Frames ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Far Fault

Abstract Variation of the fundamental period is regarded as one of the methods to assess the damage of the structures under earthquakes. The inter-relationship among seismic parameters and variation of the fundamental period can identify the potential structural damage of an earthquake. For this purpose, the present paper aimed to study the relations among main seismic parameters, incorporating a variety of information about ground motion and variation of fundamental period. Three RC frames were analyzed under far-fault earthquake records by nonlinear dynamic analyses and mathematical methods applied to assay the correlation between seismic parameters and variation of fundamental period. Based on the results, high correlations were observed between some seismic parameters and variation of fundamental period. Further, based on regression equations, new parameters with a very strong correlation with variations of fundamental periods were achieved, which can be regarded as appropriate indices to estimate the potential structural damage of an earthquake.

Hysteresis Loops of Base Isolation System - An Overview

2021 ◽  
Vol 879 ◽  
pp. 189-201
Author(s):  
M.A. Amir ◽  
N.H. Hamid
Keyword(s):  
Earthquake Engineering ◽  
Structural Damage ◽  
Base Isolation ◽  
Numerical Models ◽  
Hysteresis Loops ◽  
Human Beings ◽  
Rc Buildings ◽  
Isolation System ◽  
Base Isolation System ◽  
Isolation Systems

Recently, there are a lot of technological developments in the earthquake engineering field to reduce structural damage and one of them is a base isolation system. The base isolation system is one of the best technologies for the safety of human beings and properties under earthquake excitations. The aim of this paper is to review previous research works on simulation of base isolation systems for RC buildings and their efficiency in the safety of these buildings. Base isolation decouples superstructure from substructure to avoid transmission of seismic energy to the superstructure of RC buildings. The most effective way to assess the base isolation system for RC building under different earthquake excitations is by conducting experiment work that consumes more time and money. Many researchers had studied the behavior of base isolation system for structure through modeling the behavior of the base isolation in which base isolator is modeled through numerical models and validated through experimental works. Previous researches on the modeling of base isolation systems of structures had shown similar outcomes as the experimental work. These studies indicate that base isolation is an effective technology in immunization of structures against earthquakes.

scholarly journals Analisis Kapasitas Seismik Struktur Gedung Kantor Dinas KetahananPangan Provinsi Sumatra Barat

2021 ◽  
Vol 10 (2) ◽  
Author(s):  
Thasbih Al Fajri ◽  
Rafki Imani ◽  
Zakpar Siregar
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Seismic Evaluation ◽  
Strength Index ◽  
Seismic Capacity ◽  
Total Strength ◽  
Reinforced Concrete Building ◽  
Richter Scale ◽  
Concrete Building ◽  
West Sumatra

The office building of the food security office of West Sumatra Province is a multi-storey building with reinforced concrete structures built in earthquake-prone areas that have the potential for large-scale earthquakes such as the one that occurred in 2009. Based on USGS data, from December 2004 to October 2009 There have been 10 earthquakes measuring more than 5 on the Richter scale that rocked Indonesia and resulted in damage to buildings, both minor damage to heavy damage and evencollapsing. The big earthquake that occurred on September 30, 2009 in Padang City, West Sumatra, was measuring 7.6 on the Richter scale. In this study, evaluated the seismic capacity of a reinforced concrete building 4 (four) floors built in earthquake-prone areas in the city of Padang. The seismic capacity of the building is evaluated based on the standard published by Japan, namely The Standard for Seismic Evaluation of Existin Reinforced Concrete Building, 2001. In this evaluation, it only looks at the structural elements of the column on the first floor. Seismic capacity is expressed in terms of the lateral strength index and the ductility index of the building. The results of the evaluation of seismic capacity obtained the total strength index value of the building is 0.707. The seismic capacity of this building can be shown to be adequate or strongin earthquake-prone areas compared to the seismic capacity of reinforced concrete buildings that survived the massive earthquake of 7.6 on the Richter Scale in West Sumatra in September 2009. From the evaluation results on this building which is located in an area including the prone to strong earthquakes can be stated to be able to behave ductile and able to withstand an earthquake or not experience sudden collapse

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