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33rd International Symposium on Automation and Robotics in construction, ISARC 2016

作者： Cheng, M.-Y. Prayogo, D. Dept of Civil and Construction Engineering National Taiwan University of Science and Technology Taiwan Dept. of Civil Engineering Petra Christian University Indonesia

One of the main causes of pavement rutting is the repetitive action of traffic loads which results in the accumulation of permanent deformations. As a result, it is important to understand the characteristics of the permanent deformation behavior of asphalt mixes under repeated loading and to build the accurate mix model before they are placed in roadways. This study proposed a hybrid computational intelligence system named SOSLSSVM for modelling the permanent pavement deformation behavior of asphalt mixtures. The SOSLSSVM fuses Least Squares Support Vector Machine (LSSVM) and Symbiotic Organisms Search (SOS). LSSVM is employed for establishing the relationship model between the flow number, which is obtained from the laboratory test, and the parameters of the asphalt mix design. SOS is used to find the best LSSVM tuning parameters. A total 118 historical cases were used to establish the intelligence prediction model. Obtained results validate the ability of SOS-LSSVM to model the pavement rutting behavior of asphalt mixture with a relatively high accuracy measured by four error indicators. Therefore, the proposed computational intelligence systems can offer a high benefit for road designers and engineers in decision-making processes.

关键词： Deformation

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Assurance of environmental safety of conventional overhaul and reconstruction technologies for trunk pipelines

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IOP Conference Series: Materials Science and engineering 2018年第1期451卷

作者： S G Abramyan Department of Construction Technology Institute of Architecture and Civil Engineering of Volgograd State Technical University 1 Akademicheskaya Str. Volgograd 400074 Russia

In the paper, the author presents the analysis of certain overhaul methods for the linear part of oil and gas trunk pipelines involving the replacement of thermal insulation, which is aimed at assessing the environmental safety thereof. In particular, the following methods were reviewed: lifting and laying the pipeline on rollers on the trench shoulder or inside the trench, pipeline repair without changing its spatial layout, lifting and suspending the pipeline by pipe layers. Thereby, the paper specifically focuses on the overhaul technology providing for pipe wall restoration. In order to determine the adverse impact of operating machines and mechanisms on the atmosphere, the repair and construction works were structured to determine the number of machines and mechanisms required for each operating procedure based on the existing process flow diagrams. The amount of noxious atmospheric emissions was computed so as to factor in the motor power of machines and mechanisms. It was found that the time intervals, associated with the simultaneous performance of earthworks, lifting, cleaning, remedial welding, insulating and pipe laying works pose the greatest threats to the environment. The novelty of the paper consists in suggesting a methodology, offering new organizational solutions for overhaul and reconstruction of trunk pipelines in support of the environmental balance of the natural-industrial system.

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Seismic response of subway station with large span and Y shaped column

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Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics 2017年第1期49卷 55-64页

作者： Tao, Lianjin Liu, Chunxiao Bian, Jin Wu, Binglin Li, Jidong Xu, Youjun Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing100124 China Engineering College of Guangdong Ocean University ZhanjiangGuangdong524088 China Zhoushan Planning & Pattern Institute ZhoushanZhejiang316000 China China National Construction Corporation Technology Center Beijing101300 China School of Architecture & Civil Engineering Inner Mongolia University of Science and Technology BaotouInner Mongolia014010 China

Along with the development of subway construction, a new type of structure with long span and Y shaped column comes up. It is different from the existing subway station structure, the space is tall and spacious, which shows a comfortable environment. In order to study the seismic performance of subway station structure with this new type, taking Xinhua Street station of the Beijing Metro Line 6 as engineering background, FLAC3D was used to build the soilunderground structure dynamic model of three-dimensional finite difference to simulate the response process under the Xinhua Street artificial seismic wave excitation. Emphasis is put on the analysis of the law of acceleration, displacement and strain of both Y shaped column and side wall of the station. The numerical results are also compared with the shaking table test. The results show that the numerical results are basically identical with the shaking table test, which reflects the similar structure response. The maximum acceleration of Y shaped column occurred at the position just a little down from the top of the column, not at the top. Strain changes suddenly at the bifurcation position of Y shaped column, where this position also has the largest response displacement relative to the bottom of column and with abrupt change, so this is the part to be reinforced in aseismic design. The acceleration and change of displacement of Y shaped column are both larger than side wall. The results above may provide reasonable reference and guidance to improve the seismic performance and seismic design for similar subway station structure. © 2017, Editorial Office of Chinese Journal of Theoretical and Applied Mechanics. All right reserved.

关键词： Seismic response

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Improvement of Structural and Technologies Solutions for Erection of Flat Slab Buildings

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IOP Conference Series: Materials Science and engineering 2018年第2期463卷

作者： S G Abramyan O V Burlachenko V G Polyakov Department of Construction Technology Institute of Architecture and Civil Engineering of Volgograd State Technical University 1 Akademicheskaya str. Volgograd Russia Department Ecologica Construction and Urban Management Institute of Architecture and Civil Engineering of Volgograd State Technical University 1 Akademicheskaya str. Volgograd Russia

The object of this research is frame systems with concealed girders and flat floor slabs. The research helped identify the main advantages and disadvantages of precast/cast-in-situ frame systems for the construction of flat slab buildings using modular elements. The key methods used in the research were the analysis of the existing domestic and foreign technologies and the development of a new structural system differing from the systems discussed in the paper in terms of its technological intensity, versatility of application and rational *** authors suggest a precast/cast-in-situ frame building system with concealed girders and flat floor slabs where the volume of modular precast elements drastically exceeds that of the cast-in-situ part of the frame. This allows for considerable saving in assembly and erection time due to a reduced number of process operations and modular assembly units. In order to identify the key benefits, the suggested frame system was compared with a KUB 3-V multi-purpose beamless frame system, which has been popular in Russia in recent years. Apart from a smaller number of process operations, the new system allows reducing the scope of welding and removing embedded parts connecting shells of drop panels with the bare part of column reinforcement. It also eliminates the needs for additional installation fixtures for columns and floor slabs, such as: support brackets and conductors for each column. The envelope of a building using the suggested frame system may consist of semi-integral thermopanels offered by domestic and foreign producers.

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Behaviours of sustainable self-consolidating concrete exposed to elevated temperatures

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IOP Conference Series: Materials Science and engineering 2018年第1期433卷

作者： M Aldikheeli S Salih F Al-Zwainy Department of Structures and Water Resources College of Engineering Kufa University Najaf Iraq. Department of Building and Construction Engineering University of Technology Baghdad Iraq. Department of Civil Engineering College of Engineering Al-Nahrain University Baghdad Iraq.

The collapse of the structures may be initiated by fire, which is considered one of the most severe risks. However, there are several conditions in which structures may be exposed to elevated temperatures such as nuclear applications; factory procedures; and fires in tunnels or buildings due to accidents or terrorist attacks. Recently, Self-Consolidating Concrete (SCC) has become more broadly used, and there is thus a need to recognise its behaviours when subjected to elevated temperatures, particularly in terms of sustainable SCC. Seven sustainable SCC mixes were thus investigated in this study, each incorporating certain green materials (Portland limestone cement, high volume Class F fly ash, and locally available cement kiln dust (CKD)). All mixes were subjected to temperature levels of 200 °C, 400 °C, 600 °C, and 800 °C for two hours and cooled to room temperature either slowly (air cooling) or rapidly (water cooling). The residual (compressive, splitting, and flexural) strengths and modulus of elasticity were calculated. The results indicated that SCCs with high volumes of Class F fly ash showed the best performance when subjected to elevated temperature.

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Aerodynamic admittance research on wide-body flat steel box girder

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Open civil engineering Journal 2016年 10卷 891-904页

作者： Liu, Lian Jie Zhang, Liang Liang Wu, Bo Yang, Yang Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing400040 China School of Civil Engineering Chongqing University Chongqing400040 China Department of Highway Engineering Chongqing Construction Science Research Institute Chongqing400017 China

Aerodynamic admittance is a key parameter affecting the analysis accuracy of the bridge buffeting response. However, few articles have covered the issue of the wide-body flat box girder with much smaller depth-width ratio (such as 1/12 studied in this paper). Therefore, to explore the real buffeting force of the wide-body flat box girder, experiments of the static force coefficients and aerodynamic admittance are carried out in wind tunnel. Wooden segmental model has a scale ratio of 1/60 to an actual 42 m wide suspension bridge girder. Using the high-frequency-force-balance (HFFB) equipment fixed with the segmental model under the conditions of different wind speeds and different wind attack angles, wind power spectrums of the buffeting force are measured and the variation of aerodynamic admittance parameters is analyzed. The results show that the aerodynamic admittance of the box girder measured in the experiment with this so much smaller depth-width ratio differs from the corresponding classical Sears expression. Some inspiration can be presented for the future study of the buffeting response for this kind of much wider bridge with the similar ratio in this paper. © Liu et al.

关键词： Wind tunnels

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Modeling and Characterization of a Curved Piezoelectric Energy Harvester for Smart Paver Tiles

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Procedia Computer Science 2017年 109卷 1060-1066页

作者： Bharat Kathpalia David Tan Ilan Stern Francisco Valdes Seonghoon Kim Alper Erturk G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332 Aerospace Transportation and Advanced Systems Laboratory Georgia Tech Research Institute Atlanta GA 30318 Department of Civil Engineering and Construction Management College of Engineering and IT Georgia Southern University Statesboro GA 30460

The transformation of vibrations into low-power electricity has received growing attention over the past couple of decades. The goal in this research field is to power wireless sensors and other small electronic components by harvesting ambient mechanical energy. Piezoelectricity is arguably the most popular transduction mechanism for converting mechanical vibrations into electrical energy. As a promising concept of piezoelectric energy conversion, smart paver tiles are proposed to harness human steps for energy harvesting and a wide range of critical sensing applications ranging from security to healthcare. In this work, we explore the use of a curved piezoelectric transducer (specifically a THUNDER® configuration) for smart paver tiles both analytically and experimentally. Following the description of the smart paver tiles developed, an analytical model is developed and closed-form electromechanical frequency response functions are obtained. Experiments are performed for a range of excitation frequencies (1-10 Hz ), electrical load resistance values, and low force levels. It is shown that the first-order electromechanical model successfully represents the governing dynamics.

关键词： Piezoelectricity energy harvesting THUNDER® sensing vibration

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Development and calibration of HEC-RAS model for the juqueriquere river basin in Sao Paulo, Brazil 37

Development and calibration of HEC-RAS model for the juqueri...

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37th Hydrology and Water Resources Symposium 2016: Water, Infrastructure and the Environment, HWRS 2016

作者： Boulomytis, Vassiliki Terezinha Galvao Zuffo, Antonio Carlos Imteaz, Monzur Alam Filho, José Gilberto Dalfré Swinburne University of Technology Department of Civil and Construction Engineering MelbourneVIC Australia UNICAMP - State University of Campinas School of Civil Engineering Architecture and Urban Design Campinas São Paulo Brazil Swinburne University of Technology Department of Civil and Construction Engineering MelbourneVIC Australia

ISBN: (纸本)9781922107954

In order to understand the hydrodynamics of a river basin, it is essential to evaluate its discharge capacity. It is a challenge though, particularly for an ungauged basin, as the discharge frequently changes due to geometric and climate features. Hydraulic models, calibrated with reliable measured data, are efficient tools to assess river basin flow characteristics. In the study, HEC-RAS was used to model water levels in three cross-sections of the Juqueriquere river basin, located in the northern coastline of Sao Paulo State, Brazil. The Manning’s roughness coefficients for these locations were adjusted to fit with the measured data and corresponded to the bed, left & right banks of Camburu, Claro and Areeiro gauging stations. These coefficients were compared with the earlier estimated n-values, which were based on a theoretical approach and field campaigns. The absolute deviation and Mean Absolute Deviation (MAD) values between the estimated and calibrated Manning's n-values were calculated for each cross-section. It was found that, for some cases, calibrated n-values did not match with the theoretical estimations. The reasons for these discrepancies are discussed in this paper. © 2017 Engineers Australia. All Rights Reserved.

关键词： Hydraulic models

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Experimental studies of blast pressure due to vented explosion of methane-air system

Lecture Notes in Mechanical Engineering

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Lecture Notes in Mechanical engineering 2017年 PartF11卷 129-138页

作者： Kravtsov, Alexander N. Zdebski, Jacob Pospichal, Vaclav Šelešovský, Petr Faculty of Civil Engineering Department of Construction Technology Czech Technical University in Prague Prague Czech Republic Scientific-Research Coal Institute VVUU a. S Ostrava Czech Republic

A series of tests was conducted to investigate the blast resistances of the building to premixed methane-air interior burning and explosion. Explosion process of the gas methane medium (in the inner space) extremely depend on the object site configuration. An interior deflagration of premixed methane-air burning and explosion in a specific vented chamber can happens due the all hazards: natural, criminal, terrorist, and accidental. The full scale object was tested as control specimen. LVDTs and pressure transducers were used to record deflection histories, and pressure sensors measured airblast pressure histories. In the first stage of a study two experiments of methane-air system in differ proportion were carried out. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Explosions

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Fractional Order Derivative Viscous-elastic Damage Creep Model of Asphalt Mortar at Low Temperatures

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Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and engineering 2017年第4期25卷 770-779页

作者： Li, Ruiduo Yue, Jinchao Li, Liqin Li, Wei School of Civil and Transportation Engineering Henan University of Urban Construction Pingdingshan467036 China School of Water Conservancy and Environment Zhengzhou University Zhengzhou450002 China Testing Center of Quality and Technology Supervision of Pingdingshan Pingdingshan467000 China

The relationship between empirical power function creep model and the fractional order derivative Abel sticky pot were established, and the physical meaning of parameters of the power function was determined based on the fractional order derivative theory. A new fractional order derivative viscous-elastic damage creep model in power function equation was built by using Weibull distribution function. The bending beam rheological tests of asphalt mortar with different filler-bitumen ratios of 0.82, 1.02, 1.22 and 1.42 at -6℃, -12℃ and -18℃ were carried out to measure asphalt mortar low temperature rheological properties. Then the new damage creep model parameters were determined and analyzed based on the test results. It shows that the new fractional order derivative viscous-elastic damage creep model can accurately describe bending creep stiffness curve at different temperatures. © 2017, The Editorial Board of Journal of Basic Science and engineering. All right reserved.

关键词： Mortar

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