Compression and Cyclic Shear Behavior of Lime Mortar Brick Masonry

2017 ◽  
Vol 11 (05) ◽  
pp. 1750015 ◽  
Author(s):  
Anshu Tomar ◽  
Dilip Kumar Paul ◽  
Pankaj Agarwal
Keyword(s):  
Material Properties ◽  
Poisson Ratio ◽  
Brick Masonry ◽  
Cyclic Behavior ◽  
Compression Tests ◽  
Lime Mortar ◽  
Cyclic Shear ◽  
Northern India ◽  
Inelastic Material ◽  
Design Yield

Most of the British regime engineered heritage brick masonry in northern India is either purely in lime mortar or in lime-surkhi (crushed brick aggregate) mortar. Lime mortar constituting majorly of historical brick masonry stock and influences substantially the dynamic characteristics was investigated. The heritage buildings are highly vulnerable against seismic actions especially in the highly active tectonic regions of Himalayan foothills. Material properties of Historic Unreinforced Brick Masonry (HUBM) in lime mortar are critical to be evaluated for assessment but it is difficult to test the in-situ constituents due to intervention constraints governed by civic bodies on such heritage structures and hence exhaustive testing has been carried out on contemporary lime masonry. Compression tests have revealed the design, yield, ultimate strength and feasible inelastic material properties suitable enough to characterize the cyclic behavior of historical brick masonry in India. Elastic modulus, shear modulus and Poisson ratio have been evaluated to be on the lower side as compared to contemporary mortars constituted masonry. Parameters such as damping, hysteresis behavior, energy dissipation and stiffness degradation characterizing the seismic behavior in elastic and inelastic range suggested the improved performance of brick masonry with increase in compressive strength of lime mortar.

scholarly journals Mechanical Behavior of Brick Masonry in an Acidic Atmospheric Environment

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2694 ◽  
Author(s):  
Shansuo Zheng ◽  
Lihua Niu ◽  
Pei Pei ◽  
Jinqi Dong
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Acid Rain ◽  
Cement Mortar ◽  
Brick Masonry ◽  
Atmospheric Environment ◽  
Peak Strain ◽  
Lime Mortar ◽  
Attenuation Model

In order to evaluate the deterioration regularity for the mechanical properties of brick masonry due to acid rain corrosion, a series of mechanical property tests for mortars, bricks, shear prisms, and compressive prisms after acid rain corrosion were conducted. The apparent morphology and the compressive strength of the masonry materials (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), the shear behavior of the masonry, and the compression behavior of the masonry were analyzed. The resistance of acid rain corrosion for the cement-lime mortar prisms was the worst, and the incorporation of fly ash into the cement mortar did not improve the acid rain corrosion resistance. The effect of the acid rain corrosion damage on the mechanical properties for the brick was significant. With an increasing number of acid rain corrosion cycles, the compressive strength of the mortar prisms, and the shear and compressive strengths of the brick masonry first increased and then decreased. The peak stress first increased and then decreased whereas the peak strain gradually increased. The slope of the stress-strain curve for the compression prisms gradually decreased. Furthermore, a mathematical degradation model for the compressive strength of the masonry material (cement mortar, cement-lime mortar, cement-fly ash mortar, and brick), as well as the shear strength attenuation model and the compressive strength attenuation model of brick masonry after acid rain corrosion were proposed.

scholarly journals Cyclic behavior of the R/C frames with reinforced masonry infills

2020 ◽  
Vol 156 ◽  
pp. 05014
Author(s):  
Jafril Tanjung ◽  
Maidiawati
Keyword(s):  
Lateral Displacement ◽  
Brick Masonry ◽  
Frame Structure ◽  
Cyclic Behavior ◽  
Cyclic Loads ◽  
Seismic Capacity ◽  
Masonry Infill ◽  
Masonry Infills ◽  
Experimental Works ◽  
Reversed Cyclic

This study focuses on the experimental works to define the behavior of the reinforced concrete (R/C) frame model with the strengthening of the brick masonry infill by using the embedded reinforcement bars subjected to lateral reversed cyclic loads. A previous study by applying the lateral monotonic static loads showed that the embedded reinforcement bars increased the lateral capacity of the R/C frame and also delayed the failure of the brick masonry infill and R/C frame structure as well. However, in order to define its seismic capacity, a lateral reversed cyclic loading is required. The experimental works in this study were conducted by preparing and testing the 1/4 scaled-down R/C frame specimens represented the first story of the middle multi-story commonly constructed in the earthquake-prone area such as West Sumatera, Indonesia. The R/C frame specimens were two R/C frames with brick masonry infills where one of them strengthened by the embedded reinforced bars. All specimens were tested for applying the lateral reversed cyclic loads. The applied lateral load, the lateral displacement, the progressive cracks, and the failure mode of the specimens were observed and recorded during experimental works. As it was expected, the presence of the embedded reinforced bars in the brick masonry infills increases the seismic capacity and stiffness of the R/C specimens and also delayed the failure of the specimens. The experimental results in this study imply the simple strengthening method for the brick masonry infills.

Experimental and Numerical Simulation Study on Compressive Performance of Autoclaved Fly Ash Perforated Brick Masonry Long Columns

2011 ◽  
Vol 243-249 ◽  
pp. 704-709
Author(s):  
Chun Yi Xu ◽  
Ming Liu ◽  
Bo Xu
Keyword(s):  
Numerical Simulation ◽  
Fly Ash ◽  
Bearing Capacity ◽  
Simulation Study ◽  
Brick Masonry ◽  
Experimental Results ◽  
Compression Tests ◽  
Compression Performance ◽  
Code Compression ◽  
Compressive Performance

To study the influence of slenderness on the compressive bearing capacity of autoclaved fly ash perforated brick masonry long columns and provide experimental evidences for making corresponding technical code, compression tests were conducted on 9 autoclaved fly ash perforated brick masonrys long columns of different slenderness. The damage patterns and compression performance are analyzed. The experimental results indicate that compressive capacity decreases proportionally as slenderness increases and the proposed formula of axial compressive bearing capacity for autoclaved fly ash perforated brick masonry columns is given. The nonlinear FEA program ANSYS is also adopted to simulate the behaviors of masonry columns. By comparing results find that the simulated results agree well with the test ones, the rationality and applicability of the model are verified.

Monotonic and cyclic behavior of the nitrogen ion-implanted commercially pure-titanium

2021 ◽  
Vol 15 (1) ◽  
pp. 7662-7670
Author(s):  
N. Ali ◽  
M.S. Mustapa ◽  
T. Sujitno ◽  
T.E. Putra ◽  
Husaini .
Keyword(s):  
Material Properties ◽  
Room Temperature ◽  
Pure Titanium ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Cyclic Behavior ◽  
Strain Hardening Exponent ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Nitrogen Ion

This research aims to study the behavior of monotonic and cyclic plastic deformation on commercially pure titanium which has undergone surface treatment using the nitrogen ion implantation method. The doses of 2.0×1017 ions/cm2 and the energy of 100 keV were used to implant the nitrogen ions into the CpTi. Monotonic properties tests were performed in a laboratory air and at room temperature using ASTM E8 standard specimens. Fatigue and corrosion fatigue tests were conducted in a laboratory  air and in artificial saline solutions, at room temperature using ASTM 1801-97 specimens. Tensile tests were carried out with constant displacement rate and fatigue tests were carried under fully-reversed with stress-controlled conditions with stress amplitudes 230, 240, 250, 260, 270 and 280 MPa. The results showed the material properties of monotonic behavior for CpTi and Nii-Ti; tensile strength (σu) of 497 and 539 MPa and for 0.2% offset yield strength (σy) of 385 and 440 MPa, respectively and of cyclic behavior; cyclic strength coefficient (k’) of 568.41 and 818.64 and cyclic strain hardening exponent (n’) of 0.176 and 0.215, respectively. This study has succeeded in producing useful new material properties that will contribute to the field of material science and engineering.

scholarly journals Assessment of Native Human Articular Cartilage: A Biomechanical Protocol

Cartilage ◽  
2020 ◽  
pp. 194760352097324
Author(s):  
Wassif Kabir ◽  
Claudia Di Bella ◽  
Peter F.M. Choong ◽  
Cathal D. O’Connell
Keyword(s):  
Articular Cartilage ◽  
Poisson Ratio ◽  
Cartilage Tissue Engineering ◽  
Biomechanical Properties ◽  
Cartilage Tissue ◽  
Loading Frequency ◽  
Human Articular Cartilage ◽  
Compression Tests ◽  
Human Knee ◽  
Viscoelastic Parameters

Objectives Recapitulating the mechanical properties of articular cartilage (AC) is vital to facilitate the clinical translation of cartilage tissue engineering. Prior to evaluation of tissue-engineered constructs, it is fundamental to investigate the biomechanical properties of native AC under sudden, prolonged, and cyclic loads in a practical manner. However, previous studies have typically reported only the response of native AC to one or other of these loading regimes. We therefore developed a streamlined testing protocol to characterize the elastic and viscoelastic properties of human knee AC, generating values for several important parameters from the same sample. Design Human AC was harvested from macroscopically normal regions of distal femoral condyles of patients ( n = 3) undergoing total knee arthroplasty. Indentation and unconfined compression tests were conducted under physiological conditions (temperature 37 °C and pH 7.4) and testing parameters (strain rates and loading frequency) to assess elastic and viscoelastic parameters. Results The biomechanical properties obtained were as follows: Poisson ratio (0.4 ± 0.1), instantaneous modulus (52.14 ± 9.47 MPa) at a loading rate of 1 mm/s, Young’s modulus (1.03 ± 0.48 MPa), equilibrium modulus (7.48 ± 4.42 MPa), compressive modulus (10.60 ± 3.62 MPa), dynamic modulus (7.71 ± 4.62 MPa) at 1 Hz and loss factor (0.11 ± 0.02). Conclusions The measurements fell within the range of reported values for human knee AC biomechanics. To the authors’ knowledge this study is the first to report such a range of biomechanical properties for human distal femoral AC. This protocol may facilitate the assessment of tissue-engineered composites for their functionality and biomechanical similarity to native AC prior to clinical trials.

Piping Supports Design by Analysis and Computer Program Development for NPPs

2008 ◽  
Author(s):  
Bingbing Liang ◽  
Xuewei Sun ◽  
Gang Li ◽  
Haifeng Yin
Keyword(s):  
Computer Program ◽  
Material Properties ◽  
Nonlinear Boundary ◽  
Limit Load ◽  
Mathematic Model ◽  
Nonlinear Boundary Conditions ◽  
Analysis And Evaluation ◽  
Inelastic Material ◽  
Plastic Limit Load ◽  
Standard Support

There are over ten thousand piping supports in a NPP. Piping supports are generally divided into two groups, one is standard and the other is non-standard. No matter to which group the support belongs, should it be proved to withstand the loads acting on it with sufficient design margin following the requirements of ASME or AISC code. With the development of the computer soft ware and hardware, we use 3D mathematic model to do stress analysis for the support. The model is a combination of linear element and nonlinear element, elastic material properties and inelastic material properties. For this composite model, we use plastic limit load analysis to determine assessment section, and use linearizing method to evaluate the section, and use simplified method to model nonlinear boundary conditions. At the end, a computer program is accomplished to perform analysis and evaluation for the supports efficiently and rapidly. The program not only can be used to establish standard support manual, but also can be used to perform analysis and evaluation for the non-standard support in the field.

Cyclic shear-compression tests on masonry walls strengthened with alternative configurations of CFRP strips

2016 ◽  
Vol 14 (6) ◽  
pp. 1695-1720 ◽  
Author(s):  
Enzo Martinelli ◽  
Francesco Perri ◽  
Carmen Sguazzo ◽  
Ciro Faella
Keyword(s):  
Masonry Walls ◽  
Compression Tests ◽  
Cyclic Shear

Mechanical Response of Porous and Dense NiTi-TiC Composites

2004 ◽  
Vol 844 ◽  
Author(s):  
Douglas E. Burkes ◽  
Guglielmo Gottoli ◽  
John J. Moore ◽  
Reed A. Ayers
Keyword(s):  
Material Properties ◽  
Mechanical Response ◽  
Bulk Material ◽  
Processing Parameters ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Matrix Composites ◽  
Compression Tests ◽  
Commercial Applications ◽  
Micro Indentation

ABSTRACTThe Center for Commercial Applications of Combustion in Space (CCACS) at the Colorado School of Mines is currently using combustion synthesis to produce several advanced materials. These materials include ceramic, intermetallic, and metal-matrix composites in both porous and dense form. Currently, NiTi – TiC intermetallic ceramic composites are under investigation for use as a bone replacement material. The NiTi intermetallic has the potential to provide a surface that is capable of readily producing an oxide layer for corrosion resistance. The TiC ceramic has the potential to increase the hardness and wear resistance of the bulk material that can improve the performance lifetime of the implant. Processing parameters are critical to the production of the NiTi – TiC composite and will be discussed. These parameters can lead to the formation of substoichiometric TiC and nickel rich NiTi that changes the overall mechanical and material properties. In addition, the size of the TiC particles present within the bulk product varies with porosity. Both porous and dense samples have been mechanically analyzed employing micro-indentation techniques as well as compression tests in an attempt to characterize the mechanical response of these composites. The effects of the TiC particles, the formation of Ni3Ti intermetallic and the effects of porosity on the overall mechanical and material properties will be discussed.

Sign in / Sign up

Export Citation Format

Share Document