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Investigation of metal damage by ultrasonic broadband spectroscopy

Journal of Physics: Conference Series 2019年第1期1172卷 012059-012059页

作者： Kravcov, A Arrigoni, M Pospichal, V Shibaev, IA Sizikov, M V Pavlov, IA Zarubin, V P AN Zharinov Department of Construction Technology Faculty of Civil Engineering in Prague Thákurova 7/2077 Prague 6 - Dejvice 166 29 Czech Republic Moscow Mining Institute the National University of Science and Technology MISiS Leninskii Prospect 4 Moscow 119991 Russia Moscow Mining Institute the National University of Science and Technology MISiS Leninskii Prospect 4 Moscow 119991 Russia Physical Faculty Lomonosov Moscow State University 1 Leninskie Gory Moscow 119991 Russia International Laser Center Lomonosov Moscow State University Moscow Russia

Broadband ultrasonic spectroscopy is used for locating microcracks about 50 μm wide and more. The method allows the depth of occurrence of defects and the length of cracks to be determined with an accuracy of no more than 200 μm and no less than 500 μm, respectively. Metal articles may be up to 20 cm thick with a cross-sectional area of 3 to 10 m2.

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Computer simulation on the uplift behavior of an arrayed under-reamed anchor group in dense sand 3

Computer simulation on the uplift behavior of an arrayed und...

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2016 3rd International Conference on Systems and Informatics, ICSAI 2016

作者： Hsu, Shih-Tsung Wang, Chien-Chih Wu, Shengming Tung, Huang-Chih Department of Construction Engineering Chaoyang University of Technology Taichung Taiwan Department of Civil Engineering and Geomatics Cheng Shiu University Kaohsiung Taiwan Department of Architecture Chaoyang University of Technology Taichung Taiwan

ISBN: (纸本)9781509055210

Numerical simulation technology is extensively employed to resolute many difficulties of infrastructures. On the other hand, anchors have been broadly served as earth structures, especially in deep excavations. Practically, anchors are customarily served in a group. An under-reamed anchor has the outstanding short length and high anchorage capacity. This study used both the numerical and tested results to elucidate the axial loading behaviors of arrayed under-reamed anchor groups with various overburden depth in dense sand. This study adopted a constitutive law that includes strain hardening/softening and volumetric dilation, entitled SHASOVOD model, together with the computer simulation software FLAC3D to carry out the evaluation on the arrayed anchor groups. Examination results reveal that the loading curves estimated numerically are closed to those surveyed experimentally. The end bearing-displacement curve of a shallow anchor differs from that of a deep anchor. The interfering prompted by the 22 arrayed anchors is less than that persuaded by the 33 arrayed anchors. Besides, the interferences resulted from shallow anchor groups were slightly significant than those of deep anchor groups. When the pitches between the anchors in the group are 4D (D denotes an anchor's diameter), the yielding soils around fixed length of each anchor were extremely overlap. The average ultimate load of 33 anchors was significantly less than that of a single anchor, the efficiencies of anchor groups are 75% and 80% for shallow and deep anchors, respectively. The overlaps of yielding soils decline when anchors' pitches increase. When the anchors' pitches were 10D, the behavior of individually anchor in the anchor group tends to that of a single anchor for both shallow and deep anchor groups. © 2016 IEEE.

关键词： Anchors

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A ction 1st

A ction

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1st International Conference on Energy Geotechnics, ICEGT 2016

作者： Zhou, Hang Kong, Gangqiang Liu, Hanlong Wu, Yuedong Li, Guowei College of Civil and Transportation Engineering Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing China College of Civil Engineering Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing China

ISBN: (纸本)9781138032996

Energy pile gradually adopted in many countries, which is compatible with the principles of sustainable development. Extensive field and laboratory experiments are being undertaken in order to evaluate its thermal-mechanical performance. However, there is no sound theoretical method to reveal the fundamental mechanism of energy pile, particularly in evaluating the pile capacity change due to the temperature change. This paper develops a potential useful analytical tool for analyzing the energy pile performance and in particular to quantify the stress changes at the pile-soil interface induced by the temperature change. The analytical tool is formulated by incorporating Laloui et al ’s Advanced Constitutive Model for Environment Geomechanics- Thermal effect (ACMEG-T) into the Cavity ExpansionTheory (CET), namelyThermal-Cavity ExpansionTheory (TCET). The TCET has potential application in energy pile foundation and may provide a theoretical basis for developing design methods of energy pile capacity in the future. © 2016 Taylor & Francis Group, London.

关键词： Piles

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Performance of Reinforced Concrete Beams Retrofitted by a Direct-Shear Anchorage Retrofitting System

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Procedia engineering 2017年 210卷 132-140页

作者： Hu Ying Pang Huawei Quan Xueyou Pang Jun Luo Xiancun Pang Qiyun Liu Bao Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University) Ministry of Education Chongqing 400045 China School of Civil Engineering Chongqing University Chongqing 400045 China Chongqing Metropolitan Fire Brigade of Public Security Chongqing 401121 China

Reinforced concrete beams can be effectively strengthened by FRP plates or attaching steel plates on the soffit. The performance of this type of composite beam is controlled by the interaction at the steel-concrete interface. In this study, a total of three full-scale reinforced concrete beams, strengthened with steel plates in use of different types of strengthening methods, were tested, including one reinforced concrete beam without strengthening. In this program, a new simplified anchoring system (direct shear bolting-plate system) has been proposed for strengthening a reinforced concrete beam. Its behavior was compared to the available test results from the commonly used strengthening methods. The experimental results shows that this modified anchoring system is capable of effectively reducing the debonding failure between concrete and steel plates and controlling crack development after steel yielding. It was also found that the direct shear anchoring system is more effective in increasing the flexural strength of a reinforced concrete beam and reducing the longitudinal slipping between structural components, which was eventually for increasing the capability between concrete beams and steel plates to work together.

关键词： Direct-shear Anchorage Strengthened Debonding Reinforced concrete beam

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Development of lightweight, remediation plasters and study of their moisture behavior 17th

Development of lightweight, remediation plasters and study o...

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17th Conference on the Rehabilitation and Reconstruction of Buildings, CRRB 2015

作者： Hroudová, Jitka Zach, Jiří Sedlmajer, Martin Korjenic, Azra Brno University of Technology Faculty of Civil Engineering Institute of Technology of Building Materials and Components Veveří 331/95 Brno602 00 Czech Republic Vienna University of Technology Faculty of Civil Engineering Institute of Building Construction and Technology Karlsplatz 13 Vienna1040 Austria

ISBN: (纸本)9783038357193

One of the strategic goals of Europe 2020 is the reduction of greenhouse gas emissions by 20 % by 2020 compared to year 1990 and increasing energy efficiency by 20 %. Closely related to the revitalization of structures necessary for reasons reduction of their unsatisfactory energy consumption and then also the construction of new building structures with minimal energy requirements by using less energy demanding materials, if is it possible from easily renewable resources. Currently, the structures involved a high degree of total energy consumption in the European Union, about 40 %. Thermal insulating plasters with using lightweight aggregate based on recycled glass are the appropriate remediation materials for the rehabilitation of existing buildings, or even for thermal insulation of new structures. In view of the fact that historic buildings are often exposed to dampness and moisture, it is necessary for these redevelopment plasters also tackle studios moisture transport. The paper describes the results of the development of new insulating plasters that would have been reflected particularly in the rehabilitation of historic buildings and problematic details of building structures. © 2016 Trans Tech Publications, Switzerland.

关键词： Aggregates

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Influence of high dosage of specific C&DW micro-fillers on the fluidity of concrete

Influence of high dosage of specific C&DW micro-fillers on t...

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International Conference on Particulate Solids in Science, Industry and Environment, 2015

作者： Sicakova, Alena Urban, Karol Draganovska, Martina Technical University of Kosice Faculty of Civil Engineering Institute of Environmental Engineering Vysokoskolska 4 Kosice042 00 Slovakia Technical University of Kosice Faculty of Civil Engineering Institute of Construction Technology and Management Vysokoskolska 4 Kosice042 00 Slovakia

ISBN: (纸本)9783038356325

Waste valorisation in production of building materials can be improved by their modification using some treatment technologies. Subsequently, products prepared using these optimized raw materials can show better or even new properties. Utilisation of construction and demolition waste (C&DW) for production of building materials is discussed for a longer time world-wide, whether in the form of coarse aggregates or in the fine-grain form as a micro-filler or as a binder. Both of these forms show specific problems have to be solved for increasing the quantities consumed. Fine-grain form can be obtained by techniques like crushing, grinding and sorting as well as by their combinations. This article is aimed on the utilization of specific portion of fine-grain C&DW (ceramics, glass and concrete) for production of concrete mixes of higher fluidity. C&DW were modified by specific process (defined method of crushing followed by sorting of particles under 250 μm). This material was expected as a micro-filler-substitution of natural aggregate (NA) in 0/4 fraction to the extent possible, that the rules allow. Using relevant calculations, 40% dosage was found as complying with standard limit for the maximum content (600 kg) of particles of less than 250 μm in whole mixture including the relative share of cement and NA. In accordance with these limiting factors, standard recipes were designed. Amount of water, as well as dosage of plasticizer was adjusted during mixing in order to keep the water/cement ratio (max. 0.6) and flow class F5-F6. Resulting water consumption and dosage of plasticizer are discussed in the terms of influence of tested C&DW on the consistency and bleeding of concrete. Generally positive effect of fine-grain form of brick, glass and concrete was found compared to the reference concrete not containing those additive fine particles. © (2016) Trans Tech Publications, Switzerland.

关键词： Glass

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Research on the Bidding Evaluation Mechanism of the Method of Lowest Bidding Price Evaluated

Research on the Bidding Evaluation Mechanism of the Method o...

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2016 International Conference on construction and Real Estate Management, ICCREM 2016

作者： Liu, Huali Fang, Jun Liu, Yali Postgraduate Civil Engineering Construction and Management Wuhan Univ. of Technology Wuhan430070 China Construction Project Management Information Wuhan Univ. of Technology Wuhan430070 China Postgraduate Communication and Information Engineering Chongqing Univ Chongqing400044 China

ISBN: (纸本)9780784480274

With the accelerated pace of the new urbanization, it is particularly important to save the construction cost and maximize the utilization of funds;therefore, the application results of the lowest bidding price evaluated in some typical areas are analyzed through the field research, the bid evaluation model of the method of the lowest bidding price evaluated is analyzed by the comparative study, at the same time, it's proposed that the bidding evaluation mechanism and guarantee mechanism should be established adhering to the principles of compliance, systematization, and applicability. © 2017 American Society of civil Engineers.

关键词： Office buildings

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Nonlocal and Gradient Theories of Piezoelectric Nanoplates

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Procedia engineering 2017年 190卷 178-185页

作者： Jan Sladek Vladimir Sladek Jozef Kasala Ernian Pan Institute of Construction and Architecture Slovak Academy of Sciences 84503 Bratislava Slovakia Faculty of Special Technology Alexander Dubcek University of Trencin 91150 Trencin Slovakia Computer Modeling and Simulation Group Department of Civil Engineering University of Akron Akron OH 44325-3905 USA

Classical continuum models are unable to describe the size effect in nano/micro structures, even though this effect is observed experimentally. Therefore, modified continuum models are frequently applied for the investigation of nanomechanics due to their computational efficiency and capability of providing accurate results which are comparable to the atomistic models. In this paper, the Mindlin plate is extended to the piezoelectric nanoplate with nonlocal and gradient theories for size effect. The governing equations for bending moments, normal and shear stresses are derived via the Hamilton‘s principle. Differences between the two theories are described.

关键词： Nonlocal gradient elasticity Mindlin plate Hamilton‘s principle size effect

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Constraints to 3R construction waste reduction among contractors in Penang

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IOP Conference Series: Earth and Environmental Science 2018年第1期140卷

作者： L S Ng L W Tan T W Seow Department of Water and Environmental Engineering Faculty of Civil and Environmental Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia Department of Construction Management Faculty of Technology Management and Business Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia

Rapid development of construction industry increases construction waste on landfill leading to shorter life span of the landfill. Waste reduction through Reduce, Reuse and Recycle (3R) practice has been encouraged in construction industry towards sustainable waste management since couple of decades ago. However, waste reduction through 3R is still at its infancy in construction industry in Penang, Malaysia. The aim of this paper is to determinate the constraints to construction waste reduction through 3R among contractors in Penang. The findings reported herein is based on feedbacks from 143 construction contractors of grade CIDB G7, G6 and G5 based in Penang, experts from Penang Local Authority, CIDB in Penang and its headquarters, National Solid Waste Management Department, and headquarters of Solid Waste and Public Cleansing Management Corporation (SWCorp). Based on interviews and questionnaire surveys, constraints identified are Time and cost, Contractor's attitude and low participation, Lack of enforcement law and regulation, Lack of awareness and knowledge, Lack of coordination, and Lack of space. Awareness and knowledge, and enforcement law and regulation are the major barriers which influence others constraints as well. Therefore, these constraints should be emphasized by the authorities in order to improve the implementation of 3R construction waste reduction.

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Cyclic loading test and single plastic hinge analytical analyses of precast segmental bridge columns with a circular section 4th

Cyclic loading test and single plastic hinge analytical anal...

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4th International Conference on civil, Architectural and Hydraulic engineering, ICCAHE 2015

作者： Guo, Jian Bu, Zhan-Yu Wu, Wei-Ye School of Architecture and Civil Engineering Zhejiang University Technology Hangzhou China Ningbo Institute of Technology Zhejiang University Ningbo China Zhoushan Bridge Construction and Administrative Bureau ZhoushanZhejiang China Civil Engineering and Environment Ningbo University Ningbo China

ISBN: (纸本)9781138029163

Cyclic loading tests of two precast segmental columns and one monolithic bridge column with a circular section were conducted. Then, a single plastic hinge analytical pushover method for precast segmental bridge columns was presented based on the moment-curvature analyses of critical joints. Energy Dissipation (ED) bar unbonded length and elongation of unbonded prestressing tendon were considered in the method. The P-delta effect was included through iteration after the moment-curvature analyses. The analytical pushover method was validated through comparison with static cyclic loading test results. Parametric analyses were conducted afterwards. The influence of the variation of aspect ratio, axial load of gravity and prestressing, and ED bar ratio on the responses of lateral force-drift, joint opening and tendon stress was investigated. © 2016 Taylor & Francis Group, London.

关键词： Energy dissipation

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