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Corrigendum to “Unified determination of relative molecular diffusivity and fluid permeability for partially saturated cement-based materials” [Cem. Concr. Res. 67 (2015) 300–309]

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Cement and Concrete Research 2016年 87卷 107-107页

作者： Chunsheng Zhou Wei Chen Wei Wang Frédéric Skoczylas 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 Ecole Centrale de Lille Laboratoire de Mécanique de Lille BP 48 F-59650 Villeneuve d'Ascq France

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Seismic behavior of Steel Plate Shear Walls-Steel Frame

Seismic Behavior of Steel Plate Shear Walls-Steel Frame

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The 2nd International Conference on Materials Science and Engineering Technology (MSET 2015)

作者： SHAO Fengru SHAO Yongsong Transportation Dept China Academy of Civil Aviation Science and Technology Key Lab of Structures Dynamic Behaviour and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

A model with the ratio of 1:4 of a six layers' semi-rigid steel frame-steel plate shear wallssystem has been tested on the shaking *** strain variation of the steel plate shear wallsand the system's seismic behaviors to different kinds of seismic waves from four different siteclassification and with different peakaccelerationwere analyzed to provide theoretical and experimental evidence to the real projects.

关键词： semi-rigidjoints frame-shearwalls shaking table testing seismic behavior

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Analysis on dynamic response of reinforced reactive powder concrete two-way slabs under blast load

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Jianzhu Jiegou Xuebao/Journal of Building structures 2014年 35卷 91-98页

作者： Hou, Xiaomeng Li, Gang Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China

Reactive powder concrete (RPC) is a kind of new cementitious composite material with super high performance and high toughness, which has extensive application prospect in protective engineering. The dynamic response of RPC slabs is the basis of design of structures to resist blast. Based on compressive and tensile split Hopkinson pressure bar test results, empirical relations of dynamic increase factor (DIF)-strain rate for RPC were obtained. An approach for modeling reinforced RPC slabs under blast is presented using the software LS-DYNA. The validity of the model was established by comparing predictions from numerical analysis with relating test results. Results from parametric studies indicate that dynamic displacement of slabs is reduced significantly by considering the strain rate effect. The dynamic displacement of slabs is decreased by increasing scaled distance of blast load, depth of slabs, compressing strength of PRC and reinforcement ratio of slabs. Boundary conditions and depth of slabs have significant influence on dynamic response of RPC slabs, while load level and reinforcement ratio have minor influence on dynamic response of RPC slabs. It is an effective method to increase the depth of slabs and restraint effects to improve the blast-resistant of slabs. ©, 2014, Science Press. All right reserved.

关键词： dynamic response

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Effects of temperature on drying shrinkage of concrete

Effects of temperature on drying shrinkage of concrete

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

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

引用

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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Parametric modeling and stability analysis of temporary grandstand

Parametric modeling and stability analysis of temporary gran...

引用

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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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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Fragility-based probabilistic seismic safety assessment of RC frame structures with infilled masonry walls

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2014年 47卷 260-265页

作者： Yu, Xiaohui Li, Yanjun Lu, Dagang Jia, Mingming Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Jinan University Jinan250022 China

A suit of real ground motion records are selected as inputs. The empirical thresholds provided by the Chinese seismic design code are adopted as the definitions of the concerned limit states. Then the seismic fragility analysis is conducted for the three-story, five-story and ten-story RC frames with and without infilled masonry walls. The limit state failure probabilities and the damage state failure probabilities conditioned on the frequent earthquake, the design-based earthquake and the major earthquake are calculated. As compared to the results from the RC bare frames we can find that the infilled masonry walls can effectively reduce the failure probability of the RC frame structures under various earthquakes and can consequently promote the safety levels against earthquake.

关键词： Earthquakes

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Influence of FPB on seismic performance of single-layer reticulated domes under vertical earthquakes

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2014年 47卷 181-185页

作者： Kong, Dewen Fan, Feng Zhi, Xudong Sun, Menghan Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology Harbin150090 China

As an effective base isolation device, friction pendulum bearings (FPB) were finely modeled and applied in the K8 single-layer reticulated domes in this paper. First, influence of friction pendulum bearings was analyzed on the seismic performance of single-layer spherical reticulated shell from two aspects, the peak acceleration and earthquake energy. Moreover, the seismic performance of structure with FPB was studied under different ground motion intensities from three aspects, the dynamic stress, the nodal acceleration, and the vertical relative displacement of nodes. The result showed that the peak vertical acceleration was reduced and a part of earthquake energy was isolated by using FPBs. Under the different ground motion intensities, the seismic effect of a K8 single-layer spherical reticulated shell structure with FPB was similar.

关键词： Earthquakes

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