Experimental and numerical study on CFRP strip strengthened clay brick masonry walls subjected to vented gas explosions

Zhan, Lihua; Chen, Li; Fang, Qin; Chen, Wensu; Hao, Hong; Zhu, Rong; Zheng, Kang

doi:10.1016/j.ijimpeng.2019.02.013

Cited by 56 publications

(13 citation statements)

References 30 publications

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“…Once subjected to the blast load, the effects are extremely serious. Most casualties in civil engineering structures during external explosions are caused by structural disintegration and debris resulting from the explosion [39,73,[108][109][110][111][112][113]. Polyurea is highly applicable in structural reinforcement due to its special mechanical properties.…”

Section: Protection Of Civil Engineering Structuresmentioning

confidence: 99%

Polyurea for Blast and Impact Protection: A Review

et al. 2022

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Polyurea has attracted extensive attention from researchers and engineers in the field of blast and impact protection due to its excellent quasi-static mechanical properties and dynamic mechanical properties. Its mechanical properties and energy absorption capacity have been tuned by means of formulation optimization, molecular dynamics (MD) simulation and the addition of reinforcing materials. Owing to the special molecular structure of polyurea, the mechanism of polyurea protection against blasts and impacts is the simultaneous effect of multiple properties. For different substrates and structures, polyurea needs to provide different performance characteristics, including adhesion, hardness, breaking elongation, etc., depending on the characteristics of the load to which it is subjected. The current article reviews relevant publications in the field of polyurea blast and impact protection, including material optimization, protection mechanisms and applications in blast and impact protection.

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Section: Protection Of Civil Engineering Structuresmentioning

confidence: 99%

Polyurea for Blast and Impact Protection: A Review

et al. 2022

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“…Solid basic theory and a variety of algorithms are the foundation of the powerful function of LS-DYNA. e following is a brief introduction to its basic theory [17][18][19].…”

Section: Mathematical Model and Boundary Conditionsmentioning

confidence: 99%

Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

Zhao

Wang

Gao

2021

Mathematical Problems in Engineering

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To reduce gas disasters in low permeability and high-gas coal seams and improve gas predrainage efficiency, conventional deep-hole presplitting blasting permeability increasing technology was refined and perfected. The numerical calculation model of presplitting blasting was established by using ANSYS/LS-DYNA numerical simulation software. The damage degree of coal and rock blasting was quantitatively evaluated by using the value range of the damage variable D. According to the actual field test parameters of coal seam #3 in the Sanyuan coal mine, Dlim = 0.81–1.0 was the coal rock crushing area, Dlim = 0.19–0.81 was the coal rock crack area, and Dlim = 0–0.19 was the coal rock disturbance area. By comparing and analysing the damage distribution nephogram of coal and rock mass under the influence of different millisecond blasting time interval and the blasting effect of simulation model, the optimal layout parameters of multilayer through cracks were obtained theoretically. And, the determined parameters were tested on the working face of the 1312 transportation roadway in coal seam #3 of the Sanyuan coal mine. The permeability effect was compared and analysed through the analysis of the gas concentration, gas purity, and mixing volume before and after the implementation of deep-hole presplitting blasting antireflection technology, as well as the change of gas pressure, attenuation coefficient, permeability coefficient, and other parameters between blasting coal seams. The positive role of millisecond blasting in reducing pressure and increasing permeability in low permeability and high-gas coal seam were determined.

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“…It was found that under vented gas explosions, the wall specimen strengthened with concentrated layout showed improved blast resistance and all three wall specimens experienced typical flexural damage. The authors Rasheed et al in 2015 had focused on the mechanical behavior of high‐performance fiber‐reinforced cellular concrete to provide a better alternative than aerated autoclaved concrete blocks for structural applications of masonry. In particular, the mechanical behavior of CLC cylinders under pure compression and CLC blocks under flexure with and without polyolefin structural fiber reinforcement as well as hybrid fiber reinforcement was investigated.…”

Section: Related Workmentioning

confidence: 99%

Deep neural network‐based mechanical behavior analysis for various masonry infill walls with hybrid fiber mortar

Pitchaipillai¹,

Kumar²

2019

Structural Concrete

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Reinforced Concrete buildings with masonry infills are among the most common structural systems in many countries with regions of high seismicity. Masonry infill walls increase robustness of damaged RC structures. Although their mechanical contribution is usually neglected in structural analysis and design, they significantly affect the seismic response of RC frames. In this paper, we concentrate on the development of infill walls by using various structure design and brick types. An experimental investigation is carried out on two types of mortar mixes like conventional mortar and mortar used with hybrid fibers (polypropylene, sisal, kenaf, and aramid). Here, two types of masonry brick infills such as clay bricks and fly ash bricks are used. After construction of the specimens, each was marked properly according to their respective test of total 60 specimens, which have conventional and fiber‐mixed mortars. After 28 days curing, the masonry specimens attain their full strength and they became ready for the test. The material ratio followed to construct test specimens was according to the Indian standard. The shear test is conducted for masonry triplets and the flexural test is conducted for masonry wall panel structures. After that, the mechanical properties of this structure are validated with the help of the Restricted Boltzmann Machine (RBM)‐based Deep Neural Network (DNN). The performance of the proposed modeling is evaluated by comparing with those of the existing techniques.

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Experimental and numerical study on CFRP strip strengthened clay brick masonry walls subjected to vented gas explosions

Cited by 56 publications

References 30 publications

Polyurea for Blast and Impact Protection: A Review

Polyurea for Blast and Impact Protection: A Review

Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

Deep neural network‐based mechanical behavior analysis for various masonry infill walls with hybrid fiber mortar

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