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Research on the Bond Anchorage Properties of Alkali-Activated Slag Cementitious Material

IOP Conference Series: Materials Science and Engineering 2017年第1期281卷

作者： J Zhu W Z Zheng Y F Leng C Z Qin Z Z Xu College of Civil Engineering and Architecture Harbin University of Science and Technology Harbin 150080 Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090

By bond-anchorage property tests at 20°C ~500°C, the distribution of shear stress between carbon fiber sheets and concrete at all levels of loading and anchorage lengths were measured, which means the bond lengths during CFRP sheets are pulled off at the same time when the concrete is torn and stripped were gotten. The failure modes were obtained. In addition, the failure loads were measured, and the calculated formulas of anchorage lengths were identified by fitting at high temperature. It can be seen that the anchorage lengths of carbon fiber sheets increase with increasing temperature at 20°C ~100°C, the anchorage lengths of carbon fiber sheets decrease with increasing temperature at 100°C ~500°C. Tests prove that AASCM has favorable high-temperature resistant and bond anchorage properties.

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Creep of concrete with high amounts of supplementary cementitious materials and applications in concrete-filled tubes 4

Creep of concrete with high amounts of supplementary cementi...

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4th International Conference on Sustainable Construction Materials and Technologies, SCMT 2016

作者： Kuder, Katie Lehman, Dawn Chien, Jie Roeder, Charles Lowes, Laura Civil and Environmental Engineering Seattle University 901 12th Ave SeattleWA98122-1090 United States More Hall Civil and Environmental Engineering University of Washington SeattleWA98195-2700 United States Key Lab of Structures Dynamic Behavior Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Due to its design versatility, availability and cost efficiency, concrete continues to play a dominant role in the construction industry. However, the production of Portland cement, a primary component of typical concrete mixes, is known to have a serious impact on the environment. Increasing the use of supplementary cementitious materials (SCMs) in concrete is an obvious and necessary step to reduce the carbon emissions associated with cement production. However, most reinforced concrete (including cast-in-place and precast) structural components rely on the early stiffness and strength of the concrete to resist self-weight and construction loadings after the release of the formwork. In contrast to cement-only concretes, high SCM concretes require more time to reach the target strength and stiffness values. Therefore, a structural component that does not depend on these engineering properties during construction is preferred. Concrete-filled tubes (CFTs) offer a solution to this challenge, with the steel tube is able to support construction loads while the high SCM concrete fill develops its strength and stiffness. However, there are concerns about the long-term deformations (creep) of high SCM concrete and its impact on CFT performance. This research develops models to predict the long-term (creep) response of SCM concretes and uses those predictive models to assess the long-term response of CFTs with SCM concrete fill. The models were validated using a large SCM database and two full-scale CFTs with SCM concrete fill that were tested under sustained loading. © 2016 International Committee of the SCMT conferences. All rights reserved.

关键词： Creep

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Time-dependent reliability prediction analysis of bridge members considering dependence of failure modes and proof modes

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key Engineering Materials 2015年 648卷 25-34页

作者： Liu, Yuefei Lu, Dagang Key Laboratory of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

Structural health monitoring systems used in bridges contain sensors providing a large amount of monitored data, such as stress, deflection and ***. In this paper, firstly, based on monitored everyday extreme stress data, time-variant proof load effects of structural members were defined, and based on the time-dependent proof load effects, the time-dependent performance functions of structural member's proof modes were built;and then based on the monitored data, the Bayesian dynamic models(BDMs) of extreme stresses were built, and based on the predicted extreme stress with BDMs, the time-variant performance functions of structural member's failure modes were given;and then based on the time-dependent performance functions of failure modes and proof modes and correlation coefficients between them, with the conditional probability method, the time-dependent reliability indices of structural members were updated and predicted;finally an actual engineering was provided to illustrate the application of the proposed models and methods. © 2015 Trans Tech Publications, Switzerland.

关键词： dynamic models

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Comparjsion of seismic performance of rc precast fabricated shear wall with different infillled opening

Comparjsion of seismic performance of rc precast fabricated ...

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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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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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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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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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封闭式鞍形张拉膜模型风致气弹响应研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第8期16卷 656-668页

作者： Yue WU Zhao-qing CHEN Xiao-ying SUN Key Laboratory of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Electric Power Research Institute Henan Electric Power Company

目的:明确张拉膜结构风致气弹响应特征及气弹失稳机理。,创新点:1.采用无接触测量技术设计鞍形张拉膜结构气弹模型风洞试验;2.研究鞍形张拉膜结构的气弹响应特征;3.给出鞍形张拉膜结构的失稳机理。方法:1.在风洞中测量两个形状相同但预... 详细信息

目的:明确张拉膜结构风致气弹响应特征及气弹失稳机理。,创新点:1.采用无接触测量技术设计鞍形张拉膜结构气弹模型风洞试验;2.研究鞍形张拉膜结构的气弹响应特征;3.给出鞍形张拉膜结构的失稳机理。方法:1.在风洞中测量两个形状相同但预张力不同的封闭式鞍形张拉膜结构气弹模型在不同风速下的均匀流中的位移响应及膜面上方不同高度的风速时程;2.通过对位移响应及风速时程进行,分析,明确结构的响应随风速变化特征及气弹失稳原因。.结论:1.膜结构在风荷载作用下变形到平衡位置,并.围绕该平衡位置以特定振幅进行振动;2.大部分风向角下,多个模态被激发,结构振幅及各阶模态阻尼比随风速增大而逐渐增大;3.特定风向角下,只有单阶模态被激发;低风速下,结构振幅和模态阻尼比随风速增大而缓慢增大;超过一定风速后,结构发生涡激共振引起的气弹失稳,振幅随风速增大开始迅速增大,达到不发生涡激共振时的2–4倍,结构阻尼比随风速增大发生迅速衰减;随着风速的继续增大,结构振动中可能出现其他模态的气弹失稳;4.结构前两阶模态的无量纲气弹失稳临界风速约为0.8–1.0。

关键词：膜结构风致响应气弹失稳气弹模型涡激共振

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