scholarly journals Seismic Fragility of Chinese Light-Gauge Steel Keel Gypsum Board Partition Walls

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Duozhi Wang ◽  
Xudong Zhi ◽  
Fangxu Zhu ◽  
Yixing Wang
Keyword(s):  
Failure Mechanisms ◽  
Seismic Damage ◽  
Basic Data ◽  
Seismic Fragility ◽  
Experimental Program ◽  
Engineering Practice ◽  
Gypsum Board ◽  
Nonstructural Components ◽  
Partition Walls ◽  
Damage States

A quasi-static experimental program of light-gauge steel keel gypsum board partition walls (LSKGBPW) was carried out to evaluate the seismic damage phenomena, failure mechanisms, and fragility. The 15 specimens in five groups were designed per current Chinese codes and engineering practice. Then, three damage states were defined based on the damage and repair measures, and the fragility data of each group were presented, providing basic data for the estimation of seismic damage and consequential loss of nonstructural components.

Experimental Seismic Fragility of Cold-Formed Steel Framed Gypsum Partition Walls

2013 ◽  
Vol 139 (8) ◽  
pp. 1285-1293 ◽  
Author(s):  
Rodrigo Retamales ◽  
Ryan Davies ◽  
Gilberto Mosqueda ◽  
Andre Filiatrault
Keyword(s):  
Seismic Fragility ◽  
Partition Walls ◽  
Cold Formed Steel

scholarly journals Effect of Steel Fibers on the Hysteretic Performance of Concrete Beams with Steel Reinforcement—Tests and Analysis

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2923 ◽  
Author(s):  
Violetta K. Kytinou ◽  
Constantin E. Chalioris ◽  
Chris G. Karayannis ◽  
Anaxagoras Elenas
Keyword(s):  
Reinforced Concrete ◽  
Steel Reinforcement ◽  
Steel Fibers ◽  
Experimental Program ◽  
Engineering Practice ◽  
Cracking Behavior ◽  
Tension Softening ◽  
Proposed Model ◽  
Hysteretic Performance ◽  
Cracking Performance

The use of fibers as mass reinforcement to delay cracking and to improve the strength and the post-cracking performance of reinforced concrete (RC) beams has been well documented. However, issues of common engineering practice about the beneficial effect of steel fibers to the seismic resistance of RC structural members in active earthquake zones have not yet been fully clarified. This study presents an experimental and a numerical approach to the aforementioned question. The hysteretic response of slender and deep steel fiber-reinforced concrete (SFRC) beams reinforced with steel reinforcement is investigated through tests of eleven beams subjected to reversal cyclic loading and numerical analysis using 3D finite element (FE) modeling. The experimental program includes flexural and shear-critical SFRC beams with different ratios of steel reinforcing bars (0.55% and 1.0%), closed stirrups (from 0 to 0.5%), and fibers with content from 0.5 to 3% per volume. The developed nonlinear FE numerical simulation considers well-established relationships for the compression and tensional behavior of SFRC that are based on test results. Specifically, a smeared crack model is proposed for the post-cracking behavior of SFRC under tension, which employs the fracture characteristics of the composite material using stress versus crack width curves with tension softening. Axial tension tests of prismatic SFRC specimens are also included in this study to support the experimental project and to verify the proposed model. Comparing the numerical results with the experimental ones it is revealed that the proposed model is efficient and accurately captures the crucial aspects of the response, such as the SFRC tension softening effect, the load versus deformation cyclic envelope and the influence of the fibers on the overall hysteretic performance. The findings of this study also reveal that SFRC beams showed enhanced cyclic behavior in terms of residual stiffness, load-bearing capacity, deformation, energy dissipation ability and cracking performance, maintaining their integrity through the imposed reversal cyclic tests.

Failure Mechanisms of Pipelines Subjected to Loss of Support Under Deep Burial Conditions

2004 ◽  
Author(s):  
Yuri D. Costa ◽  
Jorge G. Zornberg ◽  
Benedito S. Bueno ◽  
Carina L. Costa
Keyword(s):  
Vertical Section ◽  
Failure Mechanisms ◽  
Soil Mass ◽  
Experimental Program ◽  
Rigid Base ◽  
Failure Patterns ◽  
Slip Surfaces ◽  
Deep Burial ◽  
Flexible Pipes ◽  
Adjacent Soil

This paper investigates the failure mechanisms of pipelines subjected to a localized loss of support. An experimental program was conducted, which consisted of a series of four centrifuge model tests containing an aluminum tube embedded in a pure dry sand backfill that was placed over an underlying rectangular rigid base moving downwards during the test. All models were built taking advantage of the longitudinal symmetry of the problem. The prototype pipe had a diameter (D) of 1.1 m and a soil cover height of about 5 D, characterizing deep burial conditions. Failure patterns were observed within a vertical section comprising the central axis of the pipe and also in four distinct vertical transverse sections along the length of the pipe in the region of ground loss. The influence of pipe stiffness and backfill density on the behavior of the system was assessed. The transverse sections showed fully developed slip surfaces starting in the vicinity of the edge of the void towards the adjacent soil mass. The mode of failure of the flexible pipes took the form of a severe deformation at the region of the shoulder and a reversal of curvature at the invert due to over-deflection. This situation was more critical in the central section. The damage experienced by the flexible pipes was noticeably more pronounced when using the looser backfill, whereas only negligible deflections were observed when using the denser backfill. The experimental results were compared with analytical predictions, which showed to be highly unconservative for the case loose backfill.

Analysis of Seismic Fragility Functions of Highway Embankments

2020 ◽  
Author(s):  
Balázs Hübner ◽  
András Mahler
Keyword(s):  
Finite Element ◽  
Earthquake Engineering ◽  
Seismic Fragility ◽  
Response Analysis ◽  
Fragility Functions ◽  
Ground Response ◽  
Ground Response Analysis ◽  
Fragility Function ◽  
Damage States ◽  
Log Normal

Vulnerability assessment of structures is a vitally important topic among earthquake engineering researchers. Generally, their primary focus is on the seismic performance of buildings. Less attention is paid to geotechnical structures, even though information about the performance of these structures (e.g. road embankments, levees, cuts) during an earthquake is essential for planning remediation and rescue efforts after disasters. In this paper the seismic fragility functions of a highway embankment are defined following an analytical methodolgy. The technique is a displacement-based evaluation of seismic vulnerability. Displacements of an embankment during a seismic event are approximated by a 2-D nonlinear ground response analysis using the finite element method. The numerical model was calibrated based on the results of a 1-D nonlinear ground response analysis. The expected displacements were calculated for 3 different embankment heights and Peak Ground Acceleration (PGA) values between 0,05 and 0,35g. Based on the results of the 2-D finite element analysis, the relationship between displacements and different seismic intensity measures (PGA, Arias-intensity) was investigated. Different damage states were considered, and the probability of their exceedance was investigated. The seismic fragility functions of the embankments were developed based on probability of exceedance of these different damage states based on a log-normal fragility function. The legitimacy of using a log-normal fragility function is also examined.

Out-of-plane seismic performance of plasterboard partition walls via quasi-static tests

2016 ◽  
Vol 49 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Crescenzo Petrone ◽  
Gennaro Magliulo ◽  
Pauline Lopez ◽  
Gaetano Manfredi
Keyword(s):  
Seismic Performance ◽  
Bending Moment ◽  
Structural Elements ◽  
Nonstructural Components ◽  
Static Tests ◽  
Static Test ◽  
Cyclic Behaviour ◽  
Testing Protocol ◽  
Partition Walls ◽  
Out Of Plane

Internal partitions, as many nonstructural components, should be subjected to a careful and rational seismic design, as is done for structural elements. A quasi-static test campaign aimed at the evaluation of the out-of-plane seismic performance of Siniat plasterboard internal partitions with steel studs was conducted according to FEMA 461 testing protocol. Four tall, i.e. 5 m high, specimens were selected from the range of internal partitions developed in Europe by Siniat, a leading supplier of plasterboard components in Europe. Under the specified testing protocol, a significant nonlinear pinched behaviour of the tested specimen was observed. The pinched behaviour was caused by the damage in the screwed connections, whose cyclic behaviour was strongly degrading. Both stiffness and strength of the specimens are significantly influenced by the board typology and the amount of screwed connections. Finally, it was concluded that Eurocodes significantly underestimate the resisting bending moment of the tested specimens.

Fragility Analysis for Highway Bridges in Taiwan

2003 ◽  
Author(s):  
W. I. Liao ◽  
C. H. Loh
Keyword(s):  
Failure Mechanisms ◽  
Highway Bridges ◽  
Fragility Analysis ◽  
Fragility Functions ◽  
New Classification ◽  
The North ◽  
Damage States

This paper presents the methods developed to enhance the transportation lifelines module in HAZ-Taiwan for highway bridges. The objective of this paper is to define the bridge classification and provide the fragility functions of the North-South Freeway in Taiwan that by utilize the available investigation data. The organization of this paper is as follows. First, the available bridge classes of the North-South freeway in Taiwan are reviewed and a new classification based on the available data to be implemented in Haz-Taiwan is proposed. Second, the description of failure mechanisms and criteria in different damage states adopted in this research are summarized. Third, the theoretical methodology of the fragility analysis for the new bridge classes and examples for freeway bridges are presented. Parameters for describing the fragility functions for each class are also generated and shown in the paper.

Experimental Program of Indoor Model Research about Single Pile Negative Friction

2014 ◽  
Vol 501-504 ◽  
pp. 160-165
Author(s):  
Chang Liu Chen ◽  
Song Qi Wei ◽  
Shuai Hua Ye ◽  
Yan Liu
Keyword(s):  
Skin Friction ◽  
Pile Foundation ◽  
Scale Model ◽  
Experimental Program ◽  
Engineering Practice ◽  
Negative Skin Friction ◽  
Friction Resistance ◽  
Model Research ◽  
Reduced Scale ◽  
Selection Of

This article aims to study the influence of negative skin friction resistance of waterishlogged pile foundation, through indoor scale model test of pile foundation in the loess areas. The program involved in the model similar than design, the model groove design, the selection of test materials, the design of the ground soil, the layout of measuring points and the research of load method in the test. Through the experimental study on the reduced scale model, we can deepen the understanding of the action mechanism of negative skin friction resistance of the pile, which could guide the engineering practice and design.

Seismic Fragility Analysis of Reinforced Concrete Frames within Service Life

2012 ◽  
Vol 166-169 ◽  
pp. 2391-2394
Author(s):  
Neng Jun Wang ◽  
Jian Min Wang ◽  
Wen Ting Jiang
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Fragility Curve ◽  
Seismic Fragility ◽  
Concrete Frames ◽  
Damage State ◽  
Reinforced Concrete Frames ◽  
Nonlinear Mechanical ◽  
Damage States ◽  
Change Tendency

An analytical method was proposed to obtain the seismic fragility curve of reinforced concrete frames within the service life. Considering the variation law of nonlinear mechanical characteristics of un-carbonated concrete within service life, the seismic fragility curve of frames was developed based on the inter-storey drift corner in the weak storey of frame structures. According to the defined frame damage states, each seismic fragility curve reflects the probability change tendency of the defined damage state in frames within service life. A numerical example was modeled to illustrate the variation characteristic of seismic fragility within the service life.

Experimental Seismic Fragility of Steel Studded Gypsum Partition Walls and Fire Sprinkler Piping Subsystems

2010 ◽  
Author(s):  
Andre Filiatrault ◽  
Gilberto Mosqueda ◽  
Rodrigo Retamales ◽  
Ryan Davies ◽  
Yuan Tian ◽  
...  
Keyword(s):  
Seismic Fragility ◽  
Partition Walls ◽  
Fire Sprinkler
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