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2015 fib Symposium: Concrete - Innovation and Design

作者： Zhai, Ximei Hu, Wenbo Key Lab. of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin Heilongjiang150090 China

A new method to infill the opening in the RC precast fabricated concrete shear wall was applied in China. In this paper, three geometrically identical RC precast fabricated shear wall specimens were experimented under constant axial load and quasi-statie cyclic lateral loading. The methods to infill the opening of the wall were respectively integration infill, masonry infill and without infill. Hysteretic curves, skeleton curves, failure process, variation of rebar strain, stiffness, ductility and energy-dissipating capacity were obtained. The results showed that the integration shear wall owns good seismic performance. Its bearing capacity, stiffness, energy-dissipating capacity are excellent while ductility is relatively poor. Masonry infilled wall and wall without infill also own good seismic performance. Meanwhile, numerical simulation of three specimens was conducted by using finite element (FE) software OpenSees. Based on the reasonable modeling and the application of multi-layer shell element, the FE results were verified with the experimental results.

关键词： Shear walls

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Seismic performance of fabricated structural system of steel frame-buckling-restrained steel plate shear wall with inclined-slots

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2016年 49卷 32-38页

作者： Peng, Han Jin, Shuangshuang Ou, Jinping Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Buckling-restrained steel plate shear wall with inclined slots (simply referred as "slotted SPSW") is a new proposed lateral resistant member. Compared with traditional steel plate shear wall, it has the advantages of more adjustable parameters, stable energy dissipation capacity and good ductility. It can also work as fabricated unit and form fabricated shear wall structure and different fabricated lateral load resisting systems by assembling units. This paper introduces the fabricated structural system of steel frame-slotted SPSW, including the design method of slotted SPSW, fabricated shear wall structure and the design procedure of the structural system. A case of 20-story office building was designed using the structural system and its seismic performance was analyzed under frequent and rare earthquake. The results show that the slotted SPSW can provide high lateral stiffness and dissipate energy thus protecting the main structure, conforming to principle of dual system and showing the structural system exhibits excellent seismic performance. © 2016, Editorial Office of China Civil Engineering Journal. All right reserved.

关键词： Energy dissipation

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Post-build concrete wing wall reinforce frame corner column seismic performance experimental

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Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology 2015年第12期47卷 21-25页

作者： Yang, Fan Zheng, Wenzhong Wang, Ying Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

6 specimens of post-build concrete wing wall located two neighboring faces of corner columns were designed and conducted to study the seismic performance of the post-build concrete wing wall reinforce frame corner column. Three test axial compression ratio including 0.31, 0.36, 0.40 was designated for exiting frame corner columns. HRB400 was used as longitudinal steel bar. The ratio of longitudinal reinforcement was 1.23%, 1.05%, 0.82% and stirrup with HPB300 ratio 0.6%. The results of six specimens under cyclic reversing load show that damage degree of the parallel wing wall away from the corner column was significant, while the corner column and the perpendicular wing wall were damaged lighter. Existing column could resist vertical loads and horizontal seismic actions. The wing walls could bear horizontal seismic action and as an effective dissipation energy component. © 2015, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

关键词： Energy utilization

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Moment modulation design method of reinforced concrete continuous beam with high-strength hot-rolled bar

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Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology 2015年第12期47卷 16-20页

作者： Li, Ling Wang, Ying Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

392 two-span continuous beams which are used HRB335, HRB400, HRB500 and HRB600 reinforcements are analyzed to investigate the bending moment amplitude modulation rule of concrete continuous beam with high-strength hot-rolled bar. The moment redistribution is investigated in two phases: One is the modulation amplitude βb caused from loading to steel yielding in control section of support. The other is βa caused from formation of a plastic hinge to the crushing of compressive extreme concrete fiber in control section of support. The results indicate that the plastic hinge appears delay and the rotation capacity of plastic hinge decreases, at the same time, the interval from the tensile extreme concrete fiber into the plastic to longitudinal reinforcement yielding ranges longer. The moment amplitude modulation coefficient equation using θp/h0 as the key parameters with a certain intercept βb has been obtained. Practical expression with ξ as independent variable has been proposed to facilitate the engineering applications. © 2015, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

关键词： Amplitude modulation

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Characterization of frozen soil-cement mixture for berm construction in cold regions

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Research in Cold and Arid Regions 2015年第4期7卷 300-306页

作者： HaoLin Yu XinLei Na ZhaoHui Joey Yang Key Lab of Structures and Dynamic Behavior and Control of Ministry of Education School of Civil EngineeringHarbin Institute of Technology Visiting Scholar University of Alaska Anchorage University of Alaska Anchorage

Lagoon berms in western Alaska are difficult to design and build due to limited resources, high cost of construction and materials, and warm permafrost conditions. This paper explores methods to treat locally available frozen materials and use them for berm construction. The goal is to find an optimized mix ratio for cement and additives that can be effective in increasing the strength and decreasing the thaw settlement of an ice-rich frozen silty soil. Soil of similar type and ice content to the permafrost found at a project site in Eek, Alaska is prepared in a cold room. The frozen soil is pulverized and cement, additives and fibers are added to the samples for enhancing shear strength and controlling thaw settlement. Thaw settlement and direct shear tests are performed to assess strength and settlement characteristics. This paper presents a sample preparation method, data from thaw settlement and direct shear tests, and analyses of the test results and preliminary conclusions.

关键词： frozen soil stabilization thaw settlement shear strength Portland cement

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Study on effects of the near fault large pulse-type ground motion on the seismic dynamic performance of space truss and its simplified model

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2016年 49卷 37-42页

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

This article focuses on the research of seismic response character of common space truss under the impact of the pulse-type ground motion, and some meaningful results listed below have been obtained: (1) In order to apply the method in the construction designing, a simplified spring-mass-damping system is put forward through the theoretical derivation and numerical simulation, which could consider the effects of bending and shearing. This system can replace the supporting structures and participate in the coupling reaction with space truss. (2) The character of near fault large pulse-type ground motion is simply explained. The differences of the seismic response are compared between the pulse-type ground motions and the non-pulse-type ground motion of the peak (0.10 g) acting on the same space truss. The correlation of the big pulse velocity spectrum and structure natural period of structure response is discussed. (3) The responses of the simplified model and the actual model under the impact of the ground motions are analyzed and compared. The result shows the reasonableness and accuracy of the simplified model. The research could provide a scientific and simplified model for the designers. © 2016, Editorial Office of China Civil Engineering Journal. All right reserved.

关键词： Seismic response

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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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Flexural behaviour of precast, prestressed ribbed RPC bottom panels

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Open Civil Engineering Journal 2015年第1期9卷 535-543页

作者： Wenzhong, Zheng Xueyuan, Lu Ying, Wang Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin150090 China

This study introduces a new type of precast, prestressed reactive powder concrete (RPC) bottom panel for a large-span composite slab. The bottom panels, which have one or two inverted ribs with openings, act as formwork during the construction stage. The paper experimentally investigated the crack characteristics, deflection, and normal section bearing capacity of four precast, prestressed ribbed RPC bottom panels under flexural load. The results indicated that the RPC ultimate strain under non-uniform compression is 5500×10-6and the plastic influence coefficient of the section modulus is linear with the longitudinal reinforcement ratio. The tensile stress of RPC at the cracked section should be considered while calculating the flexural stiffness;the equation used to determine the nominal tensile stress of RPC as a major variable for calculating the crack width at the bottom of panels was proposed. The bottom panels generally exhibit an over-reinforced failure mode behaviour without the composite layer;the calculation method of the normal section bearing capacity of this mode was established. © Wenzhong et al.

关键词： Bearing capacity

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Lattice Modelling of Chloride Diffusivity of Hardened Cement Paste

Lattice Modelling of Chloride Diffusivity of Hardened Cement...

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The 14th International Congress on the Chemistry of Cement（ICCC 2015）

作者： Hongzhi Zhang Xinchun Guan Jinping Ou Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

Based on numerical micro-structure model of cement paste,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore *** results indicate that,compared with regular model,random model has longer diffusion distance,consequently,in order to get same simulation diffusion results,the former's diffusion coefficient should be adjusted a lttlte *** Lattice models have been used in fracture mechanics of cement-based materials for a long ***,the use of lattice models has been extended on simulating chloride transport processes in this *** of the transport models focus on simulation method and process,but the difference of simulated results caused by randomness is generally *** this paper,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore element,the reason that different simulation method has different results is also found.

关键词： durability micro-scale lattice model chloride diffusion

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Numerical simulation of separated and reattached flows around a backward-facing step

Numerical simulation of separated and reattached flows aroun...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Yinsong Li Chaorong Zheng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9781467371445

Separated and reattached flows around a backward-facing step (BFS) controlled by continuous suction was numerically investigated using the turbulence model of large eddy simulation (LES) based on the dynamic kinetic energy subgrid-scale model. The effect of suction control on the flow fields was described by the suction flow coefficient, and the results indicate that suction is not only very effective in shortening the reattachment length, but also very influential in reducing the turbulence fluctuations of the reattached flows. With increasing increments of the absolute suction flow coefficient, the effect of suction control is more significant. Furthermore, comparisons of the time-averaged statistics between the numerical simulation and corresponding experiment are conducted, and it shows that the LES can acquire exact results. Therefore, feasibility of the numerical methods to simulate suction-controlled models is validated.

关键词： Backward-facing step suction large eddy simulation flow control reattachment length

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