Mechanical properties and seismic behavior of confined masonry walls in freeze-thaw environment

Zhou, Yan; Zheng, Shansuo; Chen, Liuzhuo; Li, Long; Li, Dong

doi:10.1016/j.istruc.2020.12.051

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Furthermore, stiffness, energy-dissipation capability and bearing capacity of the structure decreases and the lateral displacement of masonry wall gradually increases. This can be explained by the weakening of bond strength between mortar and bricks [60]. The residual tensile resistance of masonry can be estimated by pull-out tests [61] or other direct or indirect low-disruption techniques.…”

Section: Discussionmentioning

confidence: 99%

Damage and restoration of historical urban walls: literature review and case of studies

Sassu,

Puppio,

Safabakhsh

2023

Frattura Ed Integrità Strutturale

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Within this work, the causes of collapses and damages occurred in masonry artefacts have been evaluated to properly identify suitable monitoring and restoration methods. In this regard, a comprehensive literature review has been performed. Based on the results, the moisture has found to be a critical parameter, which affects the structural health of masonry artefacts. Diverse non-destructive methods were employed to measure the moisture and monitor the materials involved: the Infrared Thermography, the Electrical Resistivity Tomography and the Ground Penetrating Radar, the Laser Scanning and Digital Terrestrial Photogrammetry, the Global Navigation Satellite Systems, the Unilateral Nuclear Magnetic Resonance, the Laser-Induced Fluorescence technique, the Acoustic Imaging and the Acoustic Tomography, the Geographic Information System and on-site survey process as well as computer modeling of the structure with specific FEM software. Finally, the implementation of tie-beams, Fiber Reinforced Polymers layers, ventilation, draining systems, and high-quality materials are proposed as solutions for controlling the moisture effect and retrofitting.

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Section: Discussionmentioning

confidence: 99%

Damage and restoration of historical urban walls: literature review and case of studies

Sassu,

Puppio,

Safabakhsh

2023

Frattura Ed Integrità Strutturale

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“…The mechanical properties were numerically analyzed using the finite element method, with the results aligning with the test outcomes. Niu L. et al [5,6] examined the effects of freeze-thaw cycles and salt corrosion cycles on the mechanical and seismic properties of restrained masonry walls. Experimental results indicated a tendency for the compressive strength, bearing capacity, and energy dissipation capacity of mortar and brick masonry to decrease with an increasing number of freeze-thaw and corrosion cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Mechanism Impairment and Reinforcement of Empty Bucket Wall

Diao,

Cao,

et al. 2024

Buildings

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In this study, the raw material for the empty bucket wall consists of Dalun bricks unique to South Zhejiang. The investigation focuses on the changes in compressive properties of the empty bucket wall with masonry mortar strength grades of M 2.5, M 5.0, M 7.5, and M 10.0 after a designated period of maintenance in both dry and wet environments. Following this, the empty bucket wall undergoes reinforcement, and the compressive properties are studied. The ensuing comparisons yield pertinent conclusions. Unreinforced walls maintained with varying mortar strengths in a wet environment exhibit reduced cracking loads by 5.8 to 30% and damage loads by 5.6 to 10.8% compared to their counterparts in a dry environment. Reinforced walls, maintained with different mortar strengths in wet environments, show reduced cracking loads by 6.2% to 36% and damage loads by 2.5% to 5.7% compared to those in dry environments. The stress–strain curves of unreinforced and reinforced barrel walls of various strength classes are obtained by fitting the test stress–strain data to the stress–strain data derived from corresponding model equations. These stress–strain curves for unreinforced and reinforced walls align well with the model curves, affirming the precision of the tests.

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“…In areas with moderate to high seismic activity, confined masonry has been used as a common building technique for low-to mid-rise structures [24,25]. Confined masonry is a structural technique that improves the load-bearing capacity of masonry walls against both vertical and lateral loads by using tie-beams and tie-columns [26,27].…”

Section: Introductionmentioning

confidence: 99%

Structural Performance of Energy Efficient Geopolymer Concrete Confined Masonry: An Approach towards Decarbonization

et al. 2023

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Geopolymer concrete is preferred over OPC due to its use of energy waste such as fly ash, making it more sustainable and energy-efficient. However, limited research has been done on its seismic characterization in confined masonry, highlighting a gap in sustainable earthquake-resistant structures. Our study compares the performance of alkali-activated fly-ash-based geopolymer concrete bare frame and confined masonry wall panels with conventional concrete. Experimental results showed that geopolymer concrete bare frame has 3.5% higher initial stiffness and 1.0% higher lateral load-bearing capacity compared to conventional concrete. Geopolymer concrete confined masonry exhibited 45.2% higher initial stiffness and 4.1% higher ultimate seismic capacity than traditional concrete. The experimental results were verified using a numerical simulation technique with ANSYS-APDL, showing good correlation. Comparison with previously tested masonry walls revealed that GPC confined masonry has similar structural behavior to cement concrete masonry. This study demonstrates that geopolymer concrete made from waste energy such as fly ash is a sustainable and low-energy substitute for OPC concrete, particularly in highly seismic-prone areas, for a cleaner environment.

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Mechanical properties and seismic behavior of confined masonry walls in freeze-thaw environment

Cited by 8 publications

References 21 publications

Damage and restoration of historical urban walls: literature review and case of studies

Damage and restoration of historical urban walls: literature review and case of studies

Experimental Research on Mechanism Impairment and Reinforcement of Empty Bucket Wall

Structural Performance of Energy Efficient Geopolymer Concrete Confined Masonry: An Approach towards Decarbonization

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