Lateral loads carrying capacity and minimum thickness of circular and pointed masonry arches

2016 ◽  
Vol 115-116 ◽  
pp. 645-656 ◽  
Author(s):  
N. Cavalagli ◽  
V. Gusella ◽  
L. Severini
Keyword(s):  
Carrying Capacity ◽  
Lateral Loads ◽  
Minimum Thickness ◽  
Masonry Arches

Load-Carrying Behaviour of Dowel-Type Timber Connections with Multiple Slotted-in Steel Plates

2011 ◽  
Vol 94-96 ◽  
pp. 43-47
Author(s):  
Xin Hai Fan ◽  
Sheng Dong Zhang ◽  
Wen Jun Qu
Keyword(s):  
Carrying Capacity ◽  
Steel Plates ◽  
Load Carrying Capacity ◽  
Timber Structures ◽  
Lateral Loads ◽  
Large Cross Section ◽  
Load Carrying ◽  
Timber Connections ◽  
Dowel Connection ◽  
Good Agreement

The multiple-shear dowel connection with slotted-in steel plates is one of the most efficient joints for large cross section timber structures. Experiments were performed on dowel-type timber connections with one, two and three slotted in steel plates under lateral loads parallel to the grain. Test variables include the number of steel plates, the spacing of the steel plates, and the dowel diameter. Results show that the load-carrying capacity of the dowel-type connection increased as the number and spacing of steel plates in the same thickness of timber specimens. Finally, a model of the load-carrying capacity of multiple shear steel-to-timber connections is presented, which showed good agreement with the results obtained in the experiment.

On the Analysis of Minimum Thickness in Circular Masonry Arches

2011 ◽  
Vol 64 (5) ◽  
Author(s):  
Giuseppe Cocchetti ◽  
Giada Colasante ◽  
Egidio Rizzi
Keyword(s):  
Opening Angle ◽  
True Self ◽  
Minimum Thickness ◽  
Equilibrium Conditions ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Tangency Condition ◽  
Basic Equilibrium ◽  
Internal Forces ◽  
Horizontal Thrust

In this paper, the so-called Couplet–Heyman problem of finding the minimum thickness necessary for equilibrium of a circular masonry arch, with general opening angle, subjected only to its own weight is reexamined. Classical analytical solutions provided by J. Heyman are first rederived and explored in details. Such derivations make obviously use of equilibrium relations. These are complemented by a tangency condition of the resultant thrust force at the haunches' intrados. Later, given the same basic equilibrium conditions, the tangency condition is more correctly restated explicitly in terms of the true line of thrust, i.e., the locus of the centers of pressure of the resultant internal forces at each theoretical joint of the arch. Explicit solutions are obtained for the unknown position of the intrados hinge at the haunches, the minimum thickness to radius ratio and the nondimensional horizontal thrust. As expected from quoted Coulomb's observations, only the first of these three characteristics is perceptibly influenced, in engineering terms, by the analysis. This occurs more evidently at increasing opening angle of the arch, especially for over-complete arches. On the other hand, the systematic treatment presented here reveals the implications of an important conceptual difference, which appears to be relevant in the statics of masonry arches. Finally, similar trends are confirmed as well for a Milankovitch-type solution that accounts for the true self-weight distribution along the arch.

Analytical and Numerical Analysis on the Collapse Mode of Circular Masonry Arches

2010 ◽  
Vol 133-134 ◽  
pp. 467-472 ◽  
Author(s):  
Egidio Rizzi ◽  
Giuseppe Cocchetti ◽  
Giada Colasante ◽  
Fabio Rusconi
Keyword(s):  
Numerical Analysis ◽  
Angular Position ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Opening Angle ◽  
Specific Reference ◽  
Minimum Thickness ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Collapse Mode

In this paper, an analytical and numerical analysis on the collapse mode of circular masonry arches is presented. Specific reference is made to the so-called Couplet-Heyman problem of finding the minimum thickness necessary for equilibrium of a masonry arch subjected to its own weight (Heyman 1977). The note reports the results of an on-going research project at the University of Bergamo. First, analytical solutions are derived in the spirit of limit analysis, according to the classical three Heyman hypotheses and explicitly obtained in terms of the unknown angular position of the intrados hinge at the haunch, the minimum thickness to radius ratio and the non-dimensional horizontal thrust (Colasante 2007, Cocchetti et al. 2010). Results are then compared to Heyman solution. Though only the first of these three characteristics is perceptibly influenced in engineering terms, especially at increasing opening angle of the arch, the treatment settles an important conceptual difference on the use of the true line of thrust, along the line of Milankovitch work. Second, numerical simulations by the Discrete Element Method (DEM) in a Discontinuous Deformation Analysis (DDA) computational environment are provided, to further support the validity of the obtained solutions, with good overall matching of the obtained results (Rusconi 2008, Rizzi et al. 2010).

Minimum thickness of elliptical masonry arches

2013 ◽  
Vol 224 (12) ◽  
pp. 2977-2991 ◽  
Author(s):  
Haris Alexakis ◽  
Nicos Makris
Keyword(s):  
Minimum Thickness ◽  
Masonry Arches

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.

Plastic Analysis of Masonry Arches Reinforced with FRCM under Vertical and Horizontal Forces

2019 ◽  
Vol 817 ◽  
pp. 236-243
Author(s):  
Mario Como ◽  
Simona Coccia ◽  
Fabio di Carlo
Keyword(s):  
Carrying Capacity ◽  
Limit Analysis ◽  
Analytical Procedure ◽  
Horizontal Distribution ◽  
Load Carrying Capacity ◽  
Correct Position ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Load Carrying ◽  
Kinematic Mechanism

Aim of this paper is the evaluation of the increasing of the load-carrying capacity of masonry arches strengthened at intrados extrados with poliparafenilenbenzobisoxazole (PBO) fabric reinforced cementitious mortar composite. An analytical procedure is proposed, in the Limit Analysis context, considering two schemes of load: a vertical load applied at the crown of the arch and a horizontal distribution proportional to the weight. The presence of the composite material is introduced by considering a plastic behaviour of the hinges defining the virtual kinematic mechanism compatible with the Limit Analysis hypotheses. Two assumptions on these mechanisms are made: a correct position of the hinges inside the cross-section of the masonry arch or a simplified location at the intrados or at the extrados of the structure. Finally, a parametric survey is carried out in order to understand the influence of the involved parameters on the load-carrying capacity of the strengthened masonry arches.

Strengthening of Masonry Arches with FRCM Composites: A Review

2019 ◽  
Vol 817 ◽  
pp. 251-258
Author(s):  
Paolo Zampieri ◽  
Jaime Gonzalez-Libreros ◽  
Nicolò Simoncello ◽  
Carlo Pellegrino
Keyword(s):  
Construction Industry ◽  
Carrying Capacity ◽  
Steel Fiber ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
New Materials ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Clay Bricks ◽  
Load Carrying

Research on the preservation and restoration of masonry arches is of interest for the scientific and civil engineering communities, and the construction industry. Among the open investigation topics in the field, the study of new materials for strengthening masonry arches has gained attention from researchers. In this context, this paper presents the experimental results from destructive tests carried out on a masonry arch strengthened with steel fiber reinforced mortar (SFRM). The tested masonry arch was made of solid clay bricks disposed in a single layer and was strengthened with a single layer of steel FRM bonded at the arch intrados. In order to replicate the possible condition of an existing arch in which acting loads exceeded the member strength, the arch was preloaded before strengthening. The performance of the strengthened arch is discussed in terms of witnessed failure mode, ductility and increase in the load carrying capacity with respect to unstrengthened condition.

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