scholarly journals A method for predicting failure load of masonry wall panel based on structural stress state

2020 ◽  
Vol 40 (2) ◽  
pp. 1-9
Author(s):  
Yanxia Huang ◽  
Qunyi Huang ◽  
Liang Cui ◽  
Keyue Zhang ◽  
Ming Zhang
Keyword(s):  
Stress State ◽  
Failure Load ◽  
State Parameter ◽  
Masonry Wall ◽  
Lateral Loading ◽  
Experimental Results ◽  
Structural Stress ◽  
Wall Panel ◽  
Wall Panels ◽  
Failure Loads

This paper proposed a method for predicting failure loads of masonry wall panels subject to uniformly distributed lateral loading based on a concept of structural stress state. Firstly, the characteristics of the structural stress state of masonry wall panels subjected to uniform distributed lateral loading were investigated through experimental results. Then, a new parameter was proposed to characterize the structural stress state. Next, the relation of the failure loads between a specified base wall panels and other wall panel was established using the proposed parameter. In this way, a method (called a ST method) based on a structural stress state parameter to predict the failure load of masonry wall panel from the base wall panel was established. The following case studies validated the ST method by comparing the predicted failure load with the experimental results, as well as those predicted from the existing yield line theory (YLT), the FEA method and the GSED-based cellular automata (CA) method. The ST method provided an innovative way of structural analysis on the basis of structural stress state.

scholarly journals Essential Stressing State Features of Laterally Loaded Masonry Wall Panels Revealed from Experimental Displacements

2021 ◽  
Author(s):  
Bai Liu ◽  
Rui Li ◽  
Yu Zhang ◽  
Guangchun Zhou
Keyword(s):  
Failure Load ◽  
Failure Process ◽  
Qualitative Change ◽  
Characteristic Parameter ◽  
Masonry Wall ◽  
State Theory ◽  
Structural Failure ◽  
Starting Point ◽  
Wall Panels ◽  
Laterally Loaded

Abstract This study reveals the essential and general working features of laterally loaded masonry (LLM) wall panels from their experimental displacements by applying structural stressing state theory. Firstly, the generalized work of force is proposed to express the stressing state mode and its characteristic parameter. Then, the Mann-Kendall criterion is applied to detect the mutation point in the curve of the characteristic parameter with the load increase. Correspondingly, it is verified that the evolution of the stressing state mode also embodies the mutation feature. The stressing state mutation feature is inherent and common as the embodiment of the natural law from quantitative change to qualitative change of a system. The stressing state mutation feature reveals the starting point of structural failure process, which could update the existing definition of structural failure load. Further, the elastoplastic branch (EPB) point is revealed referring to the updated failure load, which might be directly taken as the design load with the rational margin of safety. In a sense, this paper presents a new way to address the classic issue of structural load-bearing capacity uncertainty and to update the existing design codes of LLM wall panels.

scholarly journals Strengthening of Un-Reinforced Brick Masonry Walls Using Epoxy Mortar

2021 ◽  
Vol 11 (2) ◽  
pp. 101-106
Author(s):  
Rashid Hameed ◽  
Saba Mahmood ◽  
M. Rizwan Riaz ◽  
S. Asad Ali Gillani ◽  
Muhammad Tahir
Keyword(s):  
Axial Compression ◽  
Carrying Capacity ◽  
Lateral Displacement ◽  
Masonry Wall ◽  
Load Test ◽  
Load Carrying Capacity ◽  
Lateral Loads ◽  
Wall Panel ◽  
Load Carrying ◽  
Wall Panels

Abstract This study is carried out to investigate the effectiveness of using externally applied epoxy mortar on joints of masonry wall panels to enhance their load carrying capacity under axial compressive and lateral loads. A total of six 113 mm thick masonry wall panels of size 1200 x 1200 mm were constructed for this study. Four out of six walls were strengthened using locally available CHEMDUR-31 epoxy mortar on joints. The remaining two walls were tested as control specimens. The control and strengthened wall panels were tested under axial compression and lateral loads. In axial compression test, out of plane central deflection and vertical strain at the center of wall panel were recorded while in lateral load test, in-plane lateral displacement of wall and horizontal strain at the center were recorded at each load increment. Failure pattern of each wall panel is also studied to notice its structural behavior. The results of this experimental study showed an increase of 45% and 60% in load carrying capacity under axial compression and lateral bending, respectively by the use of strengthening technique employed in this study.

The Damage Behaviour of Composite Tube with Pin Joint Holes

2012 ◽  
Vol 622-623 ◽  
pp. 739-742
Author(s):  
Jiang Sun ◽  
Qi Xiao
Keyword(s):  
Stress State ◽  
Failure Mode ◽  
Failure Load ◽  
Filament Winding ◽  
Experimental Results ◽  
Damage Behavior ◽  
Composite Tube ◽  
Numerical Predictions ◽  
Good Agreement

The present investigation deals with the damage behavior of composite tube with pinned-joint holes made by filament winding technique. The pin-loaded holes are tailored to fail mainly with bearing mode. The main objective of the paper is to investigate the stress state and damage behavior of pin-loaded holes made by filament winding. The failure load and the failure mode are analyzed numerically and experimentally. A good agreement between experimental results and numerical predictions is obtained.

Finite element analyses and experimental considerations of the deflection and failure behaviour of an asymmetric laminate composite bicycle handlebar

2002 ◽  
Vol 216 (4) ◽  
pp. 207-218 ◽  
Author(s):  
R R Chang
Keyword(s):  
Failure Modes ◽  
Laminate Composite ◽  
Failure Load ◽  
Laminated Composite ◽  
Experimental Results ◽  
Optimal Angle ◽  
Maximum Stiffness ◽  
Theoretical Predictions ◽  
Failure Loads ◽  
Experimental Approaches

The deformation and first-ply failure load of an asymmetric laminate composite bicycle handlebar have been studied via both theoretical and experimental approaches. The composite bicycle handlebar tube is fabricated with outer main fibre layers and inner reinforcing fibre layers and is designed to predicted first-ply failure loads. Optimal angle-ply orientations of antisymmetric [θ-θ…]-s laminated tubes designed for maximum stiffness were investigated. A number of laminated composite bicycle handlebars were fabricated and subjected to static transverse bend testing. The first-ply failure loads of laminated composite bicycle handlebars tubes were determined using acoustic emission (AE). The failure modes of the bicycle handlebars were studied, and experimental results were used to verify the theoretical predictions. The experimental results have been proved to be efficient and effective in the theoretical prediction of first-ply failure loads of laminated composite bicycle handlebars.

Experimental performance of optimized trusses

2021 ◽  
Author(s):  
Joshua A. Schultz ◽  
Phillip Geist ◽  
Brooke Whitsell ◽  
Rachel Dorr
Keyword(s):  
Point Load ◽  
Experimental Results ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Experimental Performance ◽  
High Rise ◽  
Truss Topology ◽  
Failure Loads ◽  
3D Printed

<p>A series of six 3D printed discretely optimized truss specimens and two warren truss specimens were experimentally loaded until failure. The results were compared to the theoretical failure loads and stresses determined using Maxwell’s Method. Each set of truss specimens were loaded in a simple span condition, with a point load applied at the center of the span. Each truss specimen was configured into pairs in order to prevent lateral torsional buckling (LTB) while testing. Strain, load, and displacement data was gathered for each truss specimen tested. These results were compared to the predicted results calculated by Maxwell’s theorem. Of the 6 specimens tested, all of the trusses failed within 1% - 20% of the analytical vales. The trends in the experimental results support efficacy of previously developed theories of optimized truss topology in order to increase strength and efficiency of lateral systems in high rise structures.</p>

scholarly journals Application of ANN to evaluate effective parameters affecting failure load and displacement of RC buildings

2009 ◽  
Vol 9 (3) ◽  
pp. 967-977 ◽  
Author(s):  
M. Hakan Arslan
Keyword(s):  
Failure Load ◽  
Back Propagation ◽  
Load Level ◽  
Effective Parameters ◽  
Rc Buildings ◽  
Building Stock ◽  
Capacity Curves ◽  
Rc Building ◽  
Failure Loads ◽  
Turkish Earthquake Code

Abstract. This study investigated the efficiency of an artificial neural network (ANN) in predicting and determining failure load and failure displacement of multi story reinforced concrete (RC) buildings. The study modeled a RC building with four stories and three bays, with a load bearing system composed of columns and beams. Non-linear static pushover analysis of the key parameters in change defined in Turkish Earthquake Code (TEC-2007) for columns and beams was carried out and the capacity curves, failure loads and displacements were obtained. Totally 720 RC buildings were analyzed according to the change intervals of the parameters chosen. The input parameters were selected as longitudinal bar ratio (ρl) of columns, transverse reinforcement ratio (Asw/sc), axial load level (N/No), column and beam cross section, strength of concrete (fc) and the compression bar ratio (ρ'/ρ) on the beam supports. Data from the nonlinear analysis were assessed with ANN in terms of failure load and failure displacement. For all outputs, ANN was trained and tested using of 11 back-propagation methods. All of the ANN models were found to perform well for both failure loads and displacements. The analyses also indicated that a considerable portion of existing RC building stock in Turkey may not meet the safety standards of the Turkish Earthquake Code (TEC-2007).

scholarly journals Failure assessment of steel/CFRP double strap joints

2017 ◽  
Author(s):  
Hamid Reza Majidi ◽  
Seyed Mohammad Javad Razavi ◽  
Filippo Berto
Keyword(s):  
Failure Load ◽  
Steel Structures ◽  
Predictive Modelling ◽  
Failure Behavior ◽  
Static Tensile Loading ◽  
Failure Assessment ◽  
Theoretical Predictions ◽  
Static Tensile ◽  
Failure Loads ◽  
Good Agreement

In the current study, the failure behavior of retrofitted steel structures was studied experimentally and theoretically with steel/CFRP double strap joints (DSJs) under quasi-static tensile loading. A series of DSJs with different bonding lengths are also considered and examined to experimentally assess the effective bond length. To predict the failure load values of the tested specimens, a new stress-based criterion, namely the point stress (PS) criterion is proposed. Although some theoretical predictive modelling for the strength between steel/CFRP joints under various loading conditions has been presented, in this work by using the new proposed approach, one can calculate rapidly and conveniently the failure loads of the steel/CFRP specimens. Furthermore, to assess the validity of the new proposed criterion, further experimental data on steel/CFRP DSJs available in the open literature are predicted using the PS criterion. Finally, it was found that a good agreement exists between the experimental results and the theoretical predictions based on the PS criterion.

Axial Compression Behaviour Analysis of Insulated Concrete Form (ICF) Wall Panel with Fibre Cement Board

2022 ◽  
Vol 1048 ◽  
pp. 387-395
Author(s):  
Joel Joseph Shelton ◽  
Mohammad Izazs ◽  
C. Daniel ◽  
A. Arun Solomon
Keyword(s):  
Axial Compression ◽  
Testing Machine ◽  
Peak Load ◽  
Compressive Loading ◽  
Wall Panel ◽  
Maximum Displacement ◽  
Concrete Form ◽  
Wall Panels ◽  
Fibre Cement ◽  
Cement Board

Nowadays, one of the fastest growing technique is an Insulated Concrete Form (ICF). It has advantages like cost-effective, less maintenance, soundproof, energy-efficient, waterproof and disaster-resistant. ICF wall panels are made by interlocking Fibre Cement Board (FCB) sheet which poured in placed concrete. In this study, the behaviour of the ICF wall panel under axial compression is examined with experimental and analytical methods. ICF wall panels cast with various thickness and dense FCB are tested under axial compression. ICF panels with 1.2gm3/cm dense FCB with changing width of 6mm and 10mm were casted for experimental analysis. The experiments were carried out in an universal testing machine with the capacity of 600 kN. The maximum peak load of 540 kN is observed in FCB of 10mm thick and the maximum displacement of 13mm is observed in FCB80 at the peak load. An analytical investigation is carried with Euler’s crippling load equation and an average variation of 12% is observed between analytical and experimental results. It is concluded that the ICF system of construction provides desirable plastic behaviour against axial compressive loading. Hence ICF is recommended for construction to get the maximum benefits of the wall while it reaches ultimate strain.

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