Characterization of uncertainty (probabilistic models) in verification of unreinforced masonry shear wall / Charakterisierung der Unschärfe (probabilistische Modelle) beim Nachweis von Wandscheiben aus unbewehrtem Mauerwerk

Mauerwerk ◽  
2015 ◽  
Vol 19 (4) ◽  
pp. 287-297 ◽  
Author(s):  
Mahdi Montazerolghaem ◽  
Wolfram Jäger
Keyword(s):  
Probabilistic Models ◽  
Shear Wall ◽  
Unreinforced Masonry ◽  
Masonry Shear Wall

Retrofitting Effect of Unreinforced Masonry Walls Using FRPs

2010 ◽  
Vol 452-453 ◽  
pp. 765-768 ◽  
Author(s):  
B.I. Bae ◽  
B.K. Park ◽  
Hyun Ki Choi ◽  
Chang Sik Choi
Keyword(s):  
Evaluation Method ◽  
Shear Walls ◽  
Shear Wall ◽  
Shear Behavior ◽  
Unreinforced Masonry ◽  
Seismic Retrofitting ◽  
Fiber Reinforced Polymers ◽  
Masonry Buildings ◽  
Plane Shear ◽  
Masonry Shear Wall

Unreinforced masonry buildings have significant portion of existing and historical buildings around the world. Recent earthquakes have shown the needs of seismic retrofitting for these types of buildings. There are many types of retrofitting materials for URM(unreinforced masonry buildings) such as shotcrete, ECC and FRPs. Many engineers use many types of fiber reinforced polymers because these types of material enhance the shear strength of wall without expansion of wall sectional area and additional weight of total structure. However, the complexity of mechanical behavior of masonry shear wall and the lack of experimental data of masonry wall which was retrofitted by FRPs may cause the problem that engineers hard to determine the retrofitting level. Determining and providing the information for retrofitting effect of FRPs for masonry shear wall, this paper investigate in-plane shear behavior of URM and retrofitted masonry shear walls using two types of different FRP materials. Specimens were designed to idealize the wall of low rise apartment which was built in 1970s Korea with no seismic reinforcements and have 1 aspect ratio. Retrofitting materials were carbon FRP and Hybrid sheet which have different elastic modulus and ultimate strain. Consequently, this study will evaluate the structural capacity of masonry shear wall and retrofitting effect of FRP sheet for in plane shear behavior comparing with evaluation method for reinforced concrete beam which was retrofitted by FRPs.

scholarly journals Fuzzy Numbers Applied in Reliability Assessment of Unreinforced Masonry Shear Wall

2016 ◽  
Vol 10 (6) ◽  
pp. 147
Author(s):  
Mahdi Montazerolghaem ◽  
Wolfram Jäger
Keyword(s):  
Reliability Analysis ◽  
Fuzzy Numbers ◽  
Expert Knowledge ◽  
Epistemic Uncertainty ◽  
Probabilistic Approach ◽  
Shear Wall ◽  
Unreinforced Masonry ◽  
Material Strength ◽  
Wide Range ◽  
Masonry Shear Wall

In order to have safe and economy construction, different sources of uncertainty should be properly characterized and considered in structural design and verification. A reliability analysis is run to assess the consistency of design process, including the uncertainty. A full probabilistic approach is an appropriate means in considering the aleatory portion of uncertainty. In dealing with epistemic uncertainty in reliability analysis, modern mathematical tools like fuzzy logic is required. The non-deterministic design in a case study on Unreinforced Masonry shear Wall (URMW) by applying fuzzy numbers has performed. Instead of uncertain deterministic data of material strength, a range of possible numbers in the form of fuzzy numbers introduced to the model, considering the experiences and the expert knowledge. The predicted capacity which is fuzzy number provide more insight into behavior of URMW. Moreover, the study on significant influence of each variable on the ultimate capacity of URMW is easier. Several reliability analysis are run using only stochastic method with using fuzzy numbers. The effect of model uncertainty on assessed reliability is highlighted. The distinction between linear and non-linear application of partial safety factors is assessed. The result illustrate the fluctuation of reliability level of URMW for a wide range of applied normal force and different materials.

Characterization of the Uncertainties in the Inspection Results of Ultrasonic Intelligent Pigs

2013 ◽  
Author(s):  
Mamdouh M. Salama ◽  
Bruce J. Nestleroth ◽  
Marc A. Maes ◽  
Chris Dash
Keyword(s):  
Probabilistic Models ◽  
Service Providers ◽  
Quantitative Risk Assessment ◽  
Life Extension ◽  
Internal Corrosion ◽  
Integrity Assessment ◽  
Diameter Pipe ◽  
Length Width ◽  
Pull Through

In-Line Inspections using magnetic flux leakage (MFL) and the Ultrasonic (UT) intelligent pigs are the most common tools used to assess the integrity of pipelines. But, both MFL and UT inspection results are subject to various sources of uncertainties which must be quantified and accounted for in the integrity assessment of the inspected pipeline. A series of pull-through tests (PTT) of seven MFL tools and two UT tools from five service providers was performed on a 12-inch diameter pipe containing pre-existing internal corrosion defects of various length, width, and depth, and located in a variety of circumferential and longitudinal positions. The results of these tests are used to quantify the detectability statistics and the sizing uncertainties of the different tools for future use in developing calibrated probabilistic models for reliability based inspection, quantitative risk assessment and life extension studies for pipelines. The results of the MFL tools were presented in 2012 OMAE conference and this paper presents the results of the two UT tools.

scholarly journals A simple model for damage analysis of a frame-masonry shear-wall system

2017 ◽  
Vol 129 ◽  
pp. 119-134 ◽  
Author(s):  
Simona Di Nino ◽  
Francesco D’Annibale ◽  
Angelo Luongo
Keyword(s):  
Simple Model ◽  
Shear Wall ◽  
Damage Analysis ◽  
Masonry Shear Wall ◽  
Wall System

Shake-Table Tests of a Full-Scale Three-Story Reinforced Masonry Shear Wall Structure

2016 ◽  
Vol 142 (10) ◽  
pp. 04016074 ◽  
Author(s):  
A. Stavridis ◽  
F. Ahmadi ◽  
M. Mavros ◽  
P. B. Shing ◽  
R. E. Klingner ◽  
...  
Keyword(s):  
Shear Wall ◽  
Full Scale ◽  
Wall Structure ◽  
Shake Table ◽  
Shake Table Tests ◽  
Reinforced Masonry ◽  
Masonry Shear Wall

Mechanism of the Frame-Supported Masonry Shear-Wall Structure with Inter-Story Isolation

2013 ◽  
Vol 351-352 ◽  
pp. 765-770
Author(s):  
Lei Lu ◽  
Ying Zhou
Keyword(s):  
Numerical Analysis ◽  
Shear Wall ◽  
Mixed System ◽  
Wall Structure ◽  
Stiffness Ratio ◽  
Mass Ratio ◽  
Isolation System ◽  
Wall Structures ◽  
Theoretical And Numerical Analysis ◽  
Masonry Shear Wall

Many frame-supported masonry shear-wall structures were observed severely damage in Wenchuan Earthquake. In this paper, an inter-story isolation system is implemented in such structures to mitigate the hazard of the earthquake. The mechanism of the mixed system is demonstrated by theoretical and numerical analysis. And it is concluded that the mass ratio, the below-stiffness ratio, the yield shear of isolated layer and the up-stiffness ratio are the main parameters whose effects are discussed separately. For the design convenience, a set of fitting equations of these parameters are provided.

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