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Experimental and Analytical Investigations on Impact Responses of Scs Panel with Dual Energy Absorbers

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SSRN 2024年

作者： Lu, Jingyi Wang, Yonghui Zhou, Hongyuan Ma, Jialu Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Key Lab of Urban Security and Disaster Engineering The Ministry of Education Beijing University of Technology Beijing100124 China Institute of Engineering Mechanics China Earthquake Administration Harbin150080 China

A new steel-concrete-steel panel with front aluminum foam layer and rear energy absorbing connector (SCS-FL-EAC) was firstly developed. The dynamic behavior of SCS-FL-EAC was studied through conducting drop-weight impact tests. Three stages of impact process of SCS-FL-EAC were identified. The aluminum foam layer and energy absorbing connector were crushed under impact loading. The aluminum foam layer reached densification, and a local indention was observed beneath the projectile. Plastic hinges were also found at the corners of the pleated steel plate of the energy absorbing connector. The SCS panel exhibited the combination of bi-linear global flexural deformation and local deformation. Furthermore, the effects of aluminum foam layer on the impact resistant performances of SCS-FL-EAC were investigated. The results indicated that the inclusion of the aluminum foam layer effectively mitigated inertial effects and reduced the maximum impact force. Additionally, the SCS-FL-EAC demonstrated improved impact-resistant performances with an increased thickness of the aluminum foam layer. Furthermore, an analytical model was proposed to predict the force and displacement responses of SCS-FL-EAC subjected to impact load, and the predicted impact responses showed good agreement with experimental results. © 2024, The Authors. All rights reserved.

关键词： Energy absorption

Seismic behavior and design method of seawater sea-sand concrete reinforced with GFRP and five interlocking spirals

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engineering STRUCTURES 2023年第1期291卷

作者： Xiong, Zhe Zheng, Jinhu Chen, Zepeng Huang, Yubiao Wang, Zhimin Chen, Junyu Lin, Lianghao Li, Lijuan Qiao, Sihua Liu, Feng Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Peoples R China Foshan Univ Sch Transportat & Civil Engn & Architecture Foshan Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Guangdong Jialin Construct Co Ltd Maoming 525299 Peoples R China

Seawater sea-sand concrete (SWSSC) columns reinforced with GFRP brings great benefit to island construction but its seismic behavior remains unclear. This paper provides an experimental study on the seismic behavior and design method of SWSSC columns reinforced with GFRP and five interlocking spirals. Seven columns with different stirrup configurations, spirals spacings, outer diameter of conner spirals, axial compression ratios and shear-span ratios were designed and tested under simulated seismic loading. Their failure modes, hysteretic responses, skeleton curves, stiffness degradations, ductility factor and energy dissipations were all attained and discussed in detail. The results show that the SWSSC column confined with interlocking multi spirals has better seismic resistance than that with composite rectangular stirrup. Moreover, the increase of shear-span ratio and outer diameter of conner spirals both improve the ductility and therefore enhance the seismic resistance. In contrast, the increase of axial compression ratio and spiral spacing have inverse impact on seismic resistance enhancement. Based on the testing results, a novel approaching method was also proposed to evaluate the shear bearing capacity of oblique section and the average prediction error was within 1.30% through verification with the test results.

关键词： Seawater sea -sand concrete (SWSSC) columns Interlocking multi spirals Seismic behavior Shear capacity of oblique section

Finite strain elastoplastic J2-flow model for automatically, accurately simulating pseudo-elastic effects of SMAs 2nd

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Finite strain elastoplastic J2-flow model for automatically,...

2nd International Conference on Material engineering Research, ICMER 2019

作者： Wang, Si-Yu Zhan, Lin Xi, Hui-Feng Xiao, Heng School of Mechanics & Construction Engineering and MOE Lab for Disaster Forecast & Control in Engineering Jinan University West Huangpu Avenue 601 Guangzhou510632 China

ISBN: (纸本)9783035713602

Finite strain elastoplastic J2-flow equations are established toward the purpose of automatically, accurately simulating pseudo-elastic effects of SMAs. The uniaxial responses derived from these equations in each loading-unloading cycle exactly produce a closed stress-strain curve of any given shape. Then, any given test data for pseudo-elastic hysteresis loops of SMAs may be accurately fitted by means of a new technique for combining linear spline functions into a unified, smooth interpolating function, in a sense with no need to identify any unknown parameters. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Stress-strain curves

Performance Enhancement of Recycled Coarse Aggregate Concrete by Incorporating with Macro Fibers Processed from Waste Gfrp

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SSRN 2023年

作者： Fu, Bing Xu, Guang-Ti Peng, Wei-Sen Huang, Jizhi Zou, Qiqi Kuang, You-Di School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China College of Water Conservancy and Civil Engineering South China Agricultural University Guangzhou510642 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518000 China School of Civil Engineering and Architecture Wuyi University Jiangmen529020 China

Reprocessing into coarse aggregates of concrete is a sustainable solution for the disposal of construction and demolition (C&D) waste. Use of recycled coarse aggregates however leads to a degradation in the mechanical properties of the resulting concrete, which then limits the use of recycled aggregates concrete (RAC) in structural elements. The incorporation of discrete fibers shows to be effective in eliminating the mechanical degradation problem of RAC, and this paper has therefore proposed to use macro fibers recycled from waste glass fiber reinforced polymer (GFRP) to reinforce RAC, thus improving the robustness of RAC in structural elements. The effect of macro fibers on the mechanical properties of RAC has been first examined through a series of compression and bending tests. Then, the tensile constitutive law of concrete was derived based on the load-deflection response of the beam specimens using an inverse analysis. The results revealed that the mechanical properties (e.g., compressive toughness, flexural strength, flexural toughness) of RAC can be significantly enhanced by the fiber addition. For concrete with 50% recycled aggregate (RA), the increase of macro fibers (from 0% to 0.5%, 1%, and 1.5%) leads to the enhancement of flexural strength from 3.13 MPa to 3.54, 4.69, and 5.97 MPa, and the toughness (T150) from 1.4 J to 35.5, 59.2 and 77.6 J, respectively. Such enhancements in the mechanical properties of RAC demonstrate the feasibility of the proposed method. © 2023, The Authors. All rights reserved.

关键词： Bending strength

A-stable two-step time integration methods with controllable numerical dissipation for structural dynamics

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN engineering 2020年第1期121卷 54-92页

作者： Zhang, Jie Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Sun Yat Sen Univ Sino French Inst Nucl Engn & Technol Zhuhai 519082 Peoples R China

A comprehensive study of A-stable linear two-step time integration methods for structural dynamics analysis is presented in this paper. An optimal A-stable linear two-step (OALTS) time integration method is revealed with desirable performance on low-frequency accuracy and high-frequency numerical dissipation properties. The OALTS time integration method is implemented in a direct integration manner for the second-order equations of structural dynamics;is implicit, A-stable, and second-order accurate in displacement, velocity, and acceleration, simultaneously;is easily started;and is numerical dissipation controllable. The OALTS time integration method shows desirable performance on spectral radius distribution, dissipation and dispersion errors, and overshooting behavior, where the results of some typical algorithms in the literature are also compared. Benchmark examples with/without physical damping are performed to validate the accuracy, stability, and efficiency of the OALTS time integration method.

关键词： accuracy analysis numerical dissipation stability structural dynamics time integration

Experimental Study on Permeability of Spun High Strength Concrete Material During Mechanical Loading

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SSRN 2023年

作者： He, Jingran Hong, Junjie Gao, Ruofan Liu, Feng Li, Lijuan School of Civil and Transportation Engineering Guangdong University of Technology University Mega Center 100 Waihuan West Road Guangzhou510006 China School of Mechanics and Construction Engineering Jinan University 601 West Huangpu Avenue Guangzhou510632 China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou510632 China

The pretensioned spun high strength concrete pipe pile (PHC pipe pile) is widely applied in important infrastructures of off-shore zones due to its low permeability and high capacity. During the construction process and the whole service period of PHC pipe piles, the damage is inevitably caused by many reasons, which may eventually cause the early durability failure of piles. Many researches have been conducted to study the change of permeability of normal concrete due to mechanical damage. However, the relation of permeability and damage of spun high strength concrete (SHSC) is still not been studied. To quantitively investigate the change of permeability of SHSC, a series of specimens of PHC pipe piles were tested for the change of permeability during mechanical loading process in this study. As a result, the relation of stress and permeability of spun high strength concrete as well as the crack roughness of the SHSC is obtained for efficient application in engineering. © 2023, The Authors. All rights reserved.

关键词： Piles

An explicit, accurate approach toward modeling irrecoverable deformation effects of shape memory alloys 2nd

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An explicit, accurate approach toward modeling irrecoverable...

2nd International Conference on Material engineering Research, ICMER 2019

作者： Zhan, Lin Wang, Si-Yu Xi, Hui-Feng Xiao, Heng School of Mechanics & Construction Engineering and MOE Lab for Disaster Forecast & Control in Engineering Jinan University West Huangpu Avenue 601 GuangzhouPC510632 China

ISBN: (纸本)9783035713602

Finite strain plastic deformation effects of SMAs are simulated based on finite strain elastoplastic J2-flow equations, in a direct sense with no reference to any additional variables for phase transition mechanisms. Uniaxial loading-unloading curves of any given shape may be exactly reproduced as uniaxial stress-strain responses of these equations in each loading-unloading cycle. A new technique for combining linear spline functions into a unified, smooth interpolating function is proposed toward the purpose of explicitly, accurately fitting any given test data for both loading and unloading cases. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Interpolation

Method of Analyzing Coating Structure Under Conical Concave Contact

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SSRN 2022年

作者： Huang, Shi-Qing Tang, Pan-Jun Hou, Peng-Fei Zhang, Wen-Hua MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Engineering Mechanics Hunan University Changsha410082 China

The evaluation of mechanical performance for a coating structure is important in the fields of mechanics and materials. The general theories of the contact mechanics for transversely isotropic elasticity coating structures under conical concave contact are presented in this paper. Based on the Green's function of semi-infinite bodies, the Green's function of coating structures are obtained with mirror image method. The general solution obtained indicates the displacement and stress at any position of the coating, substrate, and interface, which provide the code basis for the analysis of interface failure and determination of material parameters in numerical analysis software. This paper presents accurate solutions in the elastic stage, and there are stress singularities in the contact center and contact boundary, which provide a reference for future research on the relationships between stress singularities and plastic mechanical behavior. © 2022, The Authors. All rights reserved.

关键词： Finite element method

Mechanism of Principal Component Analysis in Structural Dynamics under Ambient Excitation

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2020年第12期20卷

作者： Lin, Yi-Zhou Nie, Zhen-Hua Ma, Hong-Wei Jinan Univ Coll Mech & Construct Engn Guangzhou Guangdong Peoples R China Minist Educ China Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China Dongguan Univ Technol Dongguan 523000 Peoples R China

Principal component analysis (PCA) is a classical dimensionally reduction method having been widely applied in structural health monitoring (SIIM) systems. However, it usually works as a "black-box" in most applications, i.e. the outputs of PCA only make sense statistically without physical meaning. This problem causes the difficulty to estimate the stability of the current PCA-based SHM methods, due to the unclear physical essence in engineering. This paper aims to propose a physical interpretation of PCA when it is applied to the response data from a multi-freedom system under ambient excitation. Both non-damping and damping cases are analyzed theoretically and verified by both numerical and laboratory experiments. The results indicate there is a close connection between the outputs of PCA and dynamical parameters: PCA can reveal information about the mode shape and modal participation of the structure. This work gives a theoretical foundation of the current PCA-based SHM method under ambient excitation, leading to the possibility of further advancement.

关键词： Modal participation ratio principal component analysis physical interpretation structural mode