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4th International Conference on Civil Engineering, Architecture and Building Materials, CEABM 2014

作者： Yang, Ying Zi Li, Mao Guang Deng, Hong Wei Liu, Qi Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9783038351665

The present study investigated experimentally effects of temperature on drying shrinkage of concrete in different water cement ratio and containing mineral admixture. Concrete was exposed to a controlled environment of 20±1°C, 35±1°C, 50±1°C, and 60% ± 5 RH, respectively. The drying shrinkage of concretes with water cement ratio of 0.3, 0.4 and 0.5 were evaluated. The resuluts showed that with the increase of temperature from 20 °C to 50 °C, the influence of water cement ratio on drying shrinkage of concrete was gradually weakened. The shrinkage strain of concretes with replacement of cement by 20% of ground granulated blast- furnace slag (GGBS), 10% of silica fume (SF), and 20% of fly ash (FA)were measured, respectively. Test results showed that GGBS had a little impact on drying shrinkage of concrete;Silica fume could increase the drying shrinkage of concrete significantly in the early and later ages, especially when concrete was subjected to high temperature;Fly ash reduced drying shrinkage in early ages and increased drying shrinkage of concrete in the later ages. © (2014) Trans Tech Publications, Switzerland.

关键词： Cements

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Research on influence of thermosiphon layout on cooling effect on transmission line pile foundation in permafrost region

Research on influence of thermosiphon layout on cooling effe...

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2014 International Conference on Sensors Instrument and Information Technology, ICSIIT 2014

作者： Yu, Hao Lin Xu, Xue Yan Wang, Wei Li, Ming Xuan Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9783038350392

Research work on the thermosiphon layout design of transmission line pile foundation in Geermu permafrost region was performed by finite element method and the influence of thermosiphon layout design on the temperature of soil around pile foundation was calculated and analyzed. The numerical calculation results indicated that the cooling effect of thermosiphon was obvious, but the coolling effect varied with the difference of thermosiphon layout design. The more thermosiphon bars were laid out aound pile foundation, the lower the temperature of soil around pile foundation. The cooling effect of thermosiphon on pile foundation and soil became weaker and weaker with the increment of the horizontal distance between soil and thermosiphon-pile. The layout design of 12 thermosiphon bars was the best for the transmission line pile foundation in permafrost region. © (2014) Trans Tech Publications, Switzerland.

关键词： Piles

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Node shift method for stiffness-based optimization of single-layer reticulated shells

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第2期15卷 97-107页

作者： Chang-yu CUI Bao-shi JIANG You-bao WANG School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Harbin 150090 China

This paper presents a node shift method to find the optimal distribution of nodes in single-layer reticulated shells. The optimization process searches for the minimum strain energy configuration and this leads to reduced sensitivity in initial imper- fections. Strain energy sensitivity numbers are derived for free shift and restricted shift where nodes can move freely in the 3D space or have to move within a predefmed surface respectively. Numerical examples demonstrate the efficiency of the proposed approach. It was found that optimized structures achieve higher ultimate load and are less sensitive to imperfections than the initial structure. The configuration of the final structure is closely related to factors like the initial structural configuration, spatial conditions, etc. Based on different initial conditions, architects can be provided with diverse reasonable structures. Furthermore, by amending the defined shapes and nodal distributions, it is possible to improve the mechanical behavior of the structures.

关键词： Node shifts Strain energy sensitivity Structural optimization Static stability Imperfection sensitivity

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Research on deterioration of anchoring performance between anchorages to steel bars for prestressed concrete under fire

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Jianzhu Jiegou Xuebao/Journal of Building structures 2014年第3期35卷 110-118页

作者： Hou, Xiaomeng Zheng, Wenzhong Sun, Hongyu Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin 150090 China

In order to research the deterioration of anchoring performance between anchorages to steel bars for prestressed concrete under fire, 65 prestressed anchorage systems were tested under elevated temperatures. The typical tested prestressed anchorage system was specifically designed, which composed by JXM-clip anchorage, 7 steel bar for prestressed concrete (with a characteristic strength fptk=970 MPa) with surrounding concrete and a loading frame. A total of 29 unsealed prestressed anchorage systems and 18 prestressed anchorage systems with insulation were conducted as transient-state tests, while 18 prestressed anchorage systems were conducted as steady-state tests. The test variables included stress level (0.2~0.7), temperature (20~800°C), insulation (sealing anchorages by grouting, fire resistive coating and sealing anchorages by grouting and coating) and heating rate (10.0, 26.7°C/min). Transient-state test results from unsealed prestressed anchorage systems show that the failure mode of prestressed anchorage system is through slippage of anchorages. Lower the stress level, temperature and heating rate are, the higher will be the failure time in prestressed anchorage systems. In steady-state tests, failure mode of prestressed anchorage system is rupture of steel bar for prestressed concrete in temperature range of 20~400°C, while failure mode is through slippage of anchorages in temperature range of 400~800°C. Anchorages after elevated temperatures can not be applied in new structures. Test results from prestressed anchorage systems with insulation show that failure mode of anchorage systems is through slippage of anchorages, and insulations do not change the failure mode at elevated temperatures. As compared with unsealed prestressed anchorage systems, the failure time of prestressed anchorage systems with insulations is increased above 100%. It is not safe to apply the recommendation of fire resistive coating thickness for steel structures in GB 14907-2002 'Fir

关键词： Failure modes

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Analyzing Risks in Public-Private-Partnership Projects: An Integrated Model of Sensitive Analysis and Monte Carlo Simulation

Analyzing Risks in Public-Private-Partnership Projects: An I...

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2018 International Conference on Construction and Real Estate Management: Construction Enterprises and Project Management, ICCREM 2018

作者： Feng, Chong Wang, Yaowu Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology China

ISBN: (数字)9780784481752

ISBN: (纸本)9780784481752

Compared with traditional financing mode of construction, public-private-partnership (PPP) mode has the great opportunity that private enterprises develop rapidly and solved the shortcomings that the amount of infrastructure investment is large and governments lack funds. Thus PPP mode is being adapted extensively. The keys to successfully implement PPP mode are effectively identifying and analyzing risks in PPP projects, in order to achieve the risk management of PPP projects. The research is aimed to establish a risk analysis model of PPP projects combining the sensitive analysis and Monte Carlo simulation. Then it uses a real case "Shijiazhuang International Exhibition Center" to verify this model and proposes strategies to deal with the main risks. The result of this case study proved effectiveness of the proposed model, which can be used in further risk analysis of PPP projects. © 2018 American Society of Civil Engineers.

关键词： Risk analysis

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Literature review of reactive powder concrete

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Jianzhu Jiegou Xuebao/Journal of Building structures 2015年第10期36卷 44-58页

作者： Zheng, Wenzhong Lv, Xueyuan Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China

This paper introduces the proportioning principles and technology of reactive powder concrete (RPC), and then summarizes RPC durability and high temperature resistance. It is found that in the calculation of bond-anchorage length, the appearance coefficient of steel bar is higher in RPC than in ordinary concrete. The flexural cracking strain of RPC beam is 705×10-6-864×10-6, higher than that of ordinary concrete beam, which is 80×10-6-120×10-6. The normal section limit compressive strain of RPC beam is 4 100×10-6-5500×10-6, higher than that of ordinary concrete beam, which is 3300×10-6. The plastic influence coefficient for sectional resisting moment of RPC beam increases with the longitudinal reinforcement ratio;the test value of inclined section shearing load-bearing capacity is lower than the calculated value due to lack of coarse aggregate interlock effect on both sides of inclined cracks in RPC beam. Compared with ordinary concrete, RPC possesses excellent performance of chloride ion permeability resistance, carbonation resistance, frost thawing resistance and sulfate resistance;RPC mixed with fiber appropriately can prevent thermal spalling effectively. Finally, this paper briefly introduces the pilot projects of RPC and manifested its broad application prospects. ©, 2015, Science Press. All right reserved.

关键词： Durability

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Parametric modeling and stability analysis of temporary grandstand

Parametric modeling and stability analysis of temporary gran...

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4th International Conference on Civil Engineering, Architecture and Building Materials, CEABM 2014

作者： He, Lin Liu, Cong Wu, Zhen Yu Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin 150090 China

ISBN: (纸本)9783038351641

Temporary grandstands bear crowd load, which is created when spectators jumping on the structure. The simplified loads applied to temporary grandstand have been obtained based on experiment data of human body jumping forces. By the ABAQUS software, the parametric and automatic modeling of three-dimensional (3D) temporary grandstand structures has been realized with Python scripting. The linear buckling analysis and nonlinear buckling analysis of the structure have been carried out. The ultimate bearing capacity and the structural deformation under crowd load have been acquired. Results show that the nonlinear effect of the structure under crowd load is very obvious;the linear buckling analysis cannot get the ultimate bearing capacity of the structure and the first order buckling mode cannot simulate the final deformation of the structure either. The research of this paper greatly improve the efficiency of the construction and automation design of temporary structures and reveal the mechanical behavior of such structure to a certain degree. © (2014) Trans Tech Publications, Switzerland.

关键词： Python

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Vibration characteristics of frozen soil under moving track loads

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Research in Cold and Arid Regions 2015年第4期7卷 414-420页

作者： AiPing Tang AnPing Zhao AiHua Wen Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Heilongjiang University China Academy of Architecture and Building School of Science Harbin Institute of Technology

Vibration due to moving traffic loads is an important factor which induces frozen soil damage; this paper analyzed these vibration characteristics of frozen soil foundation under track loads. Firstly, seismic observation array （SOA） technology was applied to monitor the three dimensional dynamic characteristics of frozen soil under movable track load in a per- mafrost region and seasonal frozen soil area. Secondly, a numerical simulation for the response of frozen soil under movable track load was performed based on finite element analysis （FEA）, The results show that dynamic characteristics of frozen soil in perpendicular and parallel direction of the track are obviously different. In the direction perpendicular to the track, the vertical acceleration amplitude had an abrupt increase in the 9-10 m from the track line. In the direction parallel to the track, the acceleration in vertical and horizontal direction had a quick attenuation compared to the other direction. Lastly, various parameters were analyzed for the purpose of controlling the dynamic response of frozen soil and the vibration attenuation in frozen soil layer.

关键词： moving track load dynamic response seismic observation array （SOA） permafrost seasonal frozen soil

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CFD investigations into snow loads on tandem-arranged gabled-roofed buildings under mutual interferences

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Cold Regions Science and Technology 2025年 238卷

作者： Guolong Zhang Qingwen Zhang Huamei Mo Dong Guo Xudong Zhi Jinzhi Wu Feng Fan Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China China Construction Engineering (Macau) Company Limited Macau 999078 China Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing 100124 China Key Laboratory of Urban Security and Disaster Engineering Ministry of Education Beijing University of Technology Beijing 100124 China

Gable-roofed buildings arranged in tandem layouts are prevalent in various industrial factories and warehouses. However, during extreme blizzards, these snow-sensitive roof structures frequently sustain significant damages due to mutual interferences between adjacent buildings. Regrettably, the snow load calculation methods provided by various national load codes primarily depend on the studies of snowdrifts on multiple flat roofs in built-up environments, overlooking the impact of other roof shapes on the interference effects. Therefore, this study delves into the snow loads on tandem-arranged gable-roofed buildings with diverse layouts under mutual interferences. Initially, a wind tunnel test of snowdrifts on a gable roof was carried out to validate the numerical method adopted in this study. Subsequently, a series of pre-simulations were performed to identify the key parameters essential for analyzing the interference effects. On the basis, an extensive study was carried out to investigate the interference mechanisms and snowdrift characteristics on two tandem-arranged gable roofs with different layouts. Overall, the interference effect manifests solely as the redistribution of snow on downstream gable roofs, categorizable into the sheltering effect in the downwind direction and the disturbance effect in the crosswind direction. The disturbed snow load on the downstream gable roof exhibits an overall uniform distribution pattern controlled by the sheltering effect, but locally shows erosion due to the disturbance effect. Across various building layouts, the snow loads on disturbed gable roofs display a strong linear trend with the spacing. Consequently, a calculation method for snow loads on disturbed gable roofs was finally proposed, comprehensively considering the interference effects of height differences and spacings.

关键词： Tall buildings

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Post-fire assessment of mechanical properties of polypropylene-fibered reactive powder concrete using non-destructive testing methods 12th

Post-fire assessment of mechanical properties of polypropyle...

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12th fib International PhD Symposium in Civil Engineering

作者： Abid, Muhammad Hou, Xiaomeng Zheng, Wenzhong Shi, Shuomang Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9788001064016

Reactive powder concrete (RPC) is an advanced generation of concrete having superior qualities than traditional types of concretes. However, fire may severely affect its quality and strength. In this paper mechanical properties of RPC containing polypropylene (PP) fibers were studied experimentally after exposure to high temperature. The quality of concrete was also assessed by non-destructive testing (NDTs) such as ultrasonic pulse velocity (UPV) method and resonance frequency (RF) method. dynamic elastic modulus has been determined by available equation from NDTs measurements. The results show that an initial increase in strength was observed up to 300℃. However, a gradual decrease in strength occurred for temperature higher than 300℃. Constitutive relationships have been proposed for structural strength assessment through NDTs. © 2018 Czech Technical University in Prague. All rights reserved.

关键词： Nondestructive examination

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