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7th International Conference on FRP Composites in Civil Engineering, CICE 2014

作者： Zhang, Huawen Smith, Scott T. Wang, Zhenyu Southern Cross University Australia Department of Engineering Southern Cross University Australia Key Lab of Structures Dynamic Behavior and Control Ministry of Education China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (纸本)9781771363082

A common problem associated with the strengthening of reinforced concrete (RC) structures with externally bonded fibre-reinforced polymer (FRP) composites is the ability of the FRP to prematurely debond. The installation of anchorage devices is an intuitive and logical means with which to enhance the debonding resistance of such strengthening systems, however, there are limited comprehensive experimental studies to date. Anchors may also enhance the ductility of the strengthened member although experimental studies are particularly limited that investigate this phenomenon. This paper reports the results of seven reinforced concrete (RC) slab.tests of which six slab. were strengthened in flexure with FRP plates. Five of the strengthened slab. were anchored with FRP anchors of different positioning and geometry. Depending on their position of installation, anchors are shown to enhance either the strength alone or both the strength and ductility of the FRP-strengthened slab..

关键词： Anchors

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Hysteretic phase transition sequence in 0.67Pb(Mg1/3Nb2/3)O3−0.33PbTiO3 single crystal driven by electric field and temperature

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Physical Review B 2015年第18期91卷 184105-184105页

作者： Limei Zheng Xiaoyan Lu Hengshan Shang Zengzhe Xi Ruixue Wang Junjun Wang Peng Zheng Wenwu Cao Condensed Matter Science and Technology Institute Harbin Institute of Technology Harbin 150080 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150001 China Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices School of Materials and Chemical Engineering Xi'an Technological University Xi'an 710032 China College of Electronics and Information Hangzhou Dianzi University Hangzhou 310018 China Department of Mathematics and Materials Research Institute Pennsylvania State University University Park Pennsylvania 16802 USA

Domain pattern variations with temperature were studied by polarizing light microscopy for the morphotropic phase boundary composition 0.67Pb(Mg1/3Nb2/3)O3−0.33PbTiO3 (PMN-0.33PT) single crystal. At room temperature, the monoclinic MA phase is the dominant phase in the unpoled crystal, which coexists with a small fraction of the tetragonal (T) phase. The orientation of spontaneous polarization was calculated to be ∼4.8∘ away from the pseudocubic 〈111〉C in the {001}C plane family. Under an electric field of 6 kV/cm along [011]C, a single domain orthorhombic (O) phase was induced but partially switched back to MA a few hours after the removal of the E field. It was found that the temperature induced phase transition sequence of the [011]C poled PMN-0.33PT single crystal is strongly hysteretic. On heating, the phase transition sequence is as follows: coexistence of O phase and MA→rhombohedral→monoclinicMC→cubic(C). On cooling, the phase transition sequence is given by C→T→MA. The complete set of dielectric, piezoelectric, and elastic constants for the [011]C poled PMN-0.33PT single crystal was measured, which showed the strong feature of the single domain O phase with high shear (d15=2321pC/N,d24=1941pC/N) and low longitudinal piezoelectric coefficients (d33=165pC/N).

关键词： SINGLE crystals ELECTRIC fields TEMPERATURE POLARIZATION (Electricity) PIEZOELECTRIC devices

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FEA on mechanical behavior of axially restrained concrete-filled steel tubular columns subjected to fire

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Jianzhu Jiegou Xuebao/Journal of Building structures 2015年 36卷 310-317页

作者： Liu, Faqi Pan, Yanchong Yang, Hua Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Tianjin Fire Research Institute of the Ministry of Public Security Tianjin300381 China

The internal force and the deformation of the column exposed to fire in structure change due to the restraint provided by adjacent members, which may affect the fire resistance. However, most of previous studies focused on the fire performance of individual concrete-filled steel tubular (CFST) column, without considering the structural interactions between the column and its adjacent members. A finite element model of axially restrained circular CFST column was developed with ABAQUS to analyze the influence of axial restraint on the axial force, axial displacement and fire resistance. It is found that axial restraint has significant influence on the axial force, which intensifies the axial force during the expansion period and relieves the axial force during the contraction period. The axial displacement decreases correspondingly, which enhances the fire resistance. The influences of parameters on the fire resistance of axially restrained columns were studied, including cross-sectional dimension, load ratio, slenderness ratio and load eccentricity ratio. The results show that the fire resistance can be increased by 10% to 40% for columns with the axial restraint stiffness ratio of 0.02 and slenderness ratio less than 30, and the beneficial effect on the fire resistance can be considered. The higher fire resistance can be attained with larger cross-sectional dimension, smaller load ratio and smaller slenderness ratio for both axially restrained and unrestrained columns. Different from members without axial restraint, the load eccentricity ratio has noticeable influence on the fire resistance of restrained columns. ©, 2015, Science Press. All right reserved.

关键词： Finite element method

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Analysis on dynamic response of quadrangular pyramid grid structure with supporting columns

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2014年第12期47卷 9-15页

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

In recent years, destructive earthquakes, such as the Wenchuan earthquake and the Lushan earthquake, have caused buckling of supporting members in large space grid structures and certain damages of bracing members, which attracted intense attentions of scholars to its failure mechanism. As a result, the conventional analyzing method, which only considers the characteristics of upper structure, and ignores the coupling effect between the supporting members and the upper structure, is reviewed. In this study, the grid structures with supporting columns are analyzed. With the regularly and obliquely placed quadrangular pyramid grid structures taken as the example, the seismic performances of grid structures with supporting columns of different stiffness are compared. In addition, the influence of site type on this kind of grid structure is evaluated. Consequently, the specific influence ranges from the varied stiffness on the grid structure under the impact of horizontal and vertical response spectrum are provided. Furthermore, the preliminary aseismic design methods are proposed for the two common types of grid structures.

关键词： Stiffness

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Probabilistic Seismic Safety Assessment of Chinese RC Frame structures Using Fragility Curves 2

Probabilistic Seismic Safety Assessment of Chinese RC Frame ...

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2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014

作者： Yu, Xiaohui Lu, Dagang Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education P.O. Box 2546 Harbin150090 China School of Civil Engineering Harbin Institute of Technology P.O. Box 2546 Harbin150090 China

ISBN: (纸本)9780784413609

A simulation-based procedure was adopted to generate fragility curves for five Chinese code-conforming reinforced concrete (RC) frame structures with increasing design-based earthquake (DBE) intensities. Two important elements, namely probabilistic seismic demand analysis (PSDA) and probabilistic seismic capacity analysis (PSCA), were involved in the procedure. In PSDA, 100 real ground motion records were selected to perform nonlinear time history analyses for representing the influence of earthquake uncertainties on structural demands. In PSCA, a group of ten structural parameters were considered as random, and then the conventional (deterministic) pushover analysis was extended by introducing 100 building samples according to the principle of the Latin hypercube sampling technique. From the derived pushover curves, the thresholds corresponding to the limit states -namely, "slight damage", "moderate damage", "extensive damage" and "complete damage" -were obtained for statistics. Finally, fragility curves were generated through combining the results of PSDA and PSCA, and the exceeding probabilities of the example frames conditioned on the three mostly concerned earthquake levels, i.e. frequent earthquake (FE), DBE and maximum considered earthquake (MCE), were consequently calculated. The results show that the increase of fortification earthquake intensity cannot correspondingly promote the probabilistic safety level. © 2014 American Society of Civil Engineers.

关键词： Uncertainty analysis

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Effect of U shape wire meshed UHPCC permanent form on the flexural behaviours of RC beam

Effect of U shape wire meshed UHPCC permanent form on the fl...

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The 10th International Symposium on High Performance Concrete - Innovation & Utilization

作者： Wu Xianqquo Lin Yang Han Sangmook Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology School of Civil Engineering Kumoh National Institute of Technology

In order to reduce the semi prefabricated RC frame component weight,improving the ductility and durability of RC components,the U shape ultra high performance cementitious composites shell with combines toughening by steel wire mesh and steel fibre is used in the permanent formwork design and a new type of reinforced concrete composite beam is *** order to investigate the influence of U shape UHPCC permanent formwork on bending behaviour of reinforced concrete beams,this paper carried out large scale bending test of the reinforced concrete with U type UHPCC permanent formwork and the bending test of contrast reinforced concrete beam is carried out *** to the test results,the effects of the U shape UHPCC permanent formwork on the flexural behaviours and failure mode of the reinforced concrete beams are studied.

关键词： Semi prefabricated beam UHPCC permanent form flexural behavior structural test

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Analysis on dynamic response of reinforced reactive powder concrete two-way slab. 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 slab. 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 slab. 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 slab. is reduced significantly by considering the strain rate effect. The dynamic displacement of slab. is decreased by increasing scaled distance of blast load, depth of slab., compressing strength of PRC and reinforcement ratio of slab.. Boundary conditions and depth of slab. have significant influence on dynamic response of RPC slab., while load level and reinforcement ratio have minor influence on dynamic response of RPC slab.. It is an effective method to increase the depth of slab. and restraint effects to improve the blast-resistant of slab.. ©, 2014, Science Press. All right reserved.

关键词： dynamic response

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Load-carrying capacity of a built-up stud fabricated with small-diameter round timber

Load-carrying capacity of a built-up stud fabricated with sm...

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World Conference on Timber Engineering: Renaissance of Timber Construction, WCTE 2014

作者： Wu, Guofang Zhu, Enchun Zhou, Hejian Pan, Jinglong Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology P.O. Box 2453 73 Huanghe Road Nangang District Harbin150090 China School of Civil Engineering Harbin Institute of Technology 73 Huanghe Road Nangang District Harbin150090 China Heilongjiang Construction Group Harbin150046 China

Small-diameter round timber is a forestry by-product mainly from thinning of the artificial forest. It is not suitable for direct use as structural members due to the low quality. To make use of the by-product, a built-up stud fabricated with small-diameter round timber was proposed in this paper and was intended to be employed in a shear wall for light wood frame construction. The load-carrying capacity of the built-up stud was investigated experimentally by testing of the specimens under axial compression and testing of the specimens under eccentric compression, respectively. To predict the load-carrying capacity considering buckling, the equation for the modified slenderness ratio of the stud was derived. The predicted load-carrying capacity using the modified slenderness ratio correlated with the test very well. Some suggestions were then given to enhance the load-carrying capacity of the built-up stud. The study provides reference for incorporating the small-diameter round timber into a shear wall of light wood frame construction and thus promotes the application of small-diameter round timber as structural members.

关键词： Timber

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Numerical simulation on dynamic response of blast-resistance door with built-in aluminum matrix syntactic foam

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Binggong Xuebao/Acta Armamentarii 2014年 35卷 263-267页

作者： Zhang, Bo-Yi Zhai, Dong-Xian Sun, Jian Wang, Wei Key Lab. of Structures Dynamic Behavior and Control Harbin Institute of Technology HarbinHeilongjiang150090 China School of Civil Engineering Harbin Institute of Technology HarbinHeilongjiang150090 China

A novel anti-blast door protective structure with built-in aluminum matrix syntactic foam is designed, which takes advantage of the good energy absorption property of the porous metal material. In order to investigate the dynamic response properties of two type of steel anti-blast door and anti-blast door with built-in aluminum matrix syntactic foam, they are compared under the explosion load of the same TNT equivalent in terms of the effective stress at the central point of the front face, the displacement-time history of the center point of the back face and the energy distribution of the structure using the FE software LS-DYNA. Simulation shows that the anti-blast door with built-in aluminum matrix syntactic foam absorbs the energy generated by the compression effect of the shock wave through the core layer of composite aluminum foam. For the anti-blast door with aluminum matrix syntactic foam, the stress field distributes more uniformly, the peak stress of the front face is reduced by 35%, the maximum displacement of the back face is decreased by 50%, which effectively improves the load bearing capacity and the deformability of the structure subjected to the explosion shock waves. ©, 2014, China Ordnance Society. All right reserved.

关键词： dynamic response

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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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