Study on mechanical properties and influencing factors of confined concrete arch in underground engineering with complex conditions

The existence of pores is a very common feature of nature and of human life, but the existence of pores will alter the mechanical properties of the material. Therefore, it is very important to study the impact of different influencing factors on the mechanical properties of porous materials and to use the law of change in mechanical properties of porous materials for our daily lives. The SBFEM (scaled boundary finite element method) method is used in this paper to calculate a large number of random models of porous materials derived from Matlab code. Multiple influencing factors can be present in these random models. Based on the Monte Carlo simulation, after a large number of model calculations were carried out, the results of the calculations were analyzed statistically in order to determine the variation law of the mechanical properties of porous materials. Moreover, this paper gives fitting formulas for the mechanical properties of different materials. This is very useful for researchers estimating the mechanical properties of porous materials in advance.

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Gum Tragacanth Fibers from Astragalus gummifer Species: Effects of Influencing Factors on Mechanical Properties of Fibers

Journal of Applied Sciences ◽

10.3923/jas.2007.2861.2865 ◽

2007 ◽

Vol 7 (19) ◽

pp. 2861-2865 ◽

Cited By ~ 9

Author(s):

Ramin Khajavi ◽

Seyed Hossein Mossav Pourgharbi ◽

Amir Kiumarsi ◽

Abosayeed Rashidi

Keyword(s):

Mechanical Properties ◽

Influencing Factors ◽

Gum Tragacanth ◽

Species Effects

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Mechanical Properties of Large Scale Confined Concrete

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.1983 ◽

2011 ◽

Vol 94-96 ◽

pp. 1983-1988

Author(s):

Jia Song ◽

Zhen Bao Li ◽

Yong Ping Xie ◽

Xiu Li Du ◽

Yue Gao

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Axial Compression ◽

Large Scale ◽

Plain Concrete ◽

Concrete Columns ◽

Confined Concrete ◽

Transverse Reinforcement ◽

Test Results ◽

Reinforcement Configuration

An experimental study was made of the mechanical properties of large scale confined concrete subjected to the axial compression test. Eleven tied concrete columns and six plain concrete prisms were tested. In the test, each specimen had the same transverse reinforcement configuration, and similar volumetric ratio of lateral steel, while different size. The test results in this paper indicate that the size of the specimen has no obvious relationship with the ultimate strength, however, it does affect the post-peak ductility to some extent. As a supplement to the experimental study, a finite element method was adopted to imitate the mechanical behavior of the confined concrete under axial compression. The results of the imitation in this paper indicate the confinement mechanism of large scale specimens.

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Experimental study on laminated bamboo lumber column

E3S Web of Conferences ◽

10.1051/e3sconf/20183802001 ◽

2018 ◽

Vol 38 ◽

pp. 02001 ◽

Cited By ~ 1

Author(s):

Chenwei Wang ◽

Huizhong Zhang ◽

Chenjie Zhao ◽

Chenge Zhang ◽

Tongwei Cao ◽

...

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Tensile Stress ◽

Bearing Capacity ◽

Influencing Factors ◽

Ultimate Load ◽

Eccentric Compression ◽

Laminated Bamboo ◽

Standard Normal ◽

Laminated Bamboo Lumber

This paper presents and discusses the experimental study on the mechanical properties of LBL column both under axial and eccentric compression. The results shows that the ultimate load for the eccentric compression specimens with the eccentricity values of 30 mm and 110 mm are 95.2 kN and 31.8 kN respectively. Eccentricity is one of the main influencing factors for the ultimate bearing capacity of the LBL columns. Because of the vulnerability of the mechanical connections or natural nodes to tensile stress and secondly, laminated bamboo is vulnerable to defects that has more detrimental influence on the tensile resistance of the material. The variation in strain for the laminated bamboo lumber column sections is linear throughout the loading process, following standard normal section bending theory which is similar as that for the beam.

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Combustion Synthesis of Alumina-Based Multiphase Foam Ceramic

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.1526 ◽

2008 ◽

Vol 368-372 ◽

pp. 1526-1528 ◽

Cited By ~ 2

Author(s):

Jun Shou Li ◽

Liang Li ◽

Jian Jiang Wang ◽

Bing She Xu ◽

Yu Jun Yin

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Combustion Synthesis ◽

Influencing Factors ◽

Direct Observation ◽

Compression Strength ◽

Pore Diameter ◽

Foaming Agent ◽

Temperature Resistance ◽

Foam Ceramic

Al2O3-TiO-TiO2 multiphase foam ceramic was prepared with Al powders and TiO2 powders by combustion synthesis, Direct observation and metallographic microscope indicated that the pore diameter is 100~6000μm, and Archimedean method showed that the porosity is 35~50%. The influencing factors of the pore diameter and porosity and, the effects of adding SiO2 on compression strength of the Al2O3- TiO-TiO2 multiphase foam ceramic were discussed. It was shown that the addition of proper high temperature foaming agent can increase porosity and adding SiO2 can decrease porosity. The Al2O3-TiO-TiO2 multiphase foam ceramic has good mechanical properties and high-temperature resistance.

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Microstructural Characteristics of Polyurea and Polyurethanexerogels for Concrete Confinement with FRP System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.742.237 ◽

2013 ◽

Vol 742 ◽

pp. 237-242 ◽

Cited By ~ 5

Author(s):

Mostafa Fakharifar ◽

Zhi Bin Lin ◽

Cheng Lin Wu ◽

Shruti Mahadik-Khanolkar ◽

Nicholas Leventis ◽

...

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Pilot Study ◽

Mechanical Behavior ◽

Confined Concrete ◽

Stress Strain ◽

Microstructural Characteristics ◽

Concrete Confinement ◽

Energy Absorbing

Due to their exceptional mechanical properties,xerogels attract increasing attention forstructural applications. In this study, the mechanical behavior of two types of polymeric xerogelsis investigated. The excellent energy-absorbing capability of those xerogelsis demonstrated by their stress-strain relations with respect to their microstructure determined withscanning electron microscopy (SEM). A pilot study on the effects of xerogellayers in an FRP system for concrete confinementis conducted.Test results clearly indicatedthat the proposed multi-layer systemcan significantly increase the ductility of confined concrete.

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Research on Applied of CBF Composite Material in Engineering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.137 ◽

2013 ◽

Vol 838-841 ◽

pp. 137-141

Author(s):

Sheng Ji Jin ◽

Zi Xin Liu ◽

Zhong Liang Li ◽

Yan Ling Wang

Keyword(s):

Mechanical Properties ◽

Composite Material ◽

Low Cost ◽

Engineering Application ◽

Building Structure ◽

Fire Retardancy ◽

Reinforcement Effect ◽

Cold Region ◽

Underground Engineering ◽

Application Characteristics

Based on the consequences of abundant relevant literatures, this essay expounded the latest mechanical properties research results of the concrete reinforced with CBF and its application on building structure reinforcement studied by the domestic and foreign scholars. Research suggests that the new composite material of concrete reinforced with CBF has many excellent engineering application characteristics such as good crack resistance, durability, permeability resistance, high temperature resistance and fire retardancy. CBF is a kind of good reinforcement materials with so many advantages including simple construction, favorable reinforcement effect and low cost. We can infer that CBF can be widely used in underground engineering port, deep-water wharf, cross-sea bridges and tunnels, cold region and other fields based on the good mechanical properties and durability of the concrete reinforced with CBF in the future.

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