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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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Axial compression performances of concrete filled flax-basalt hybrid fibers reinforced FRP tubes 12

Axial compression performances of concrete filled flax-basal...

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Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures, APFIS 2015

作者： Xia, Yuanyuan Xian, Guijun Li, Hui Key Lab. of Structural Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

Flax fiber reinforced polymer (FFRP) composites could be used in civil engineering as structural materials. To improve the mechanical properties and durability of FFRP, flax-basalt hybrid fiber reinforced polymer (HFRP) composite was developed. In the present study, unidirectional HFRP tubes were prepared with a winding process, and the compression performances of the concrete filled HFRP tubes were investigated. HFRP coupon was prepared and tested in tensile properties. The tensile results of the HFRP plate coupons shows linear in stress-strain, and hybrid with basalt fiber enhances the elongation at break remarkably. The tensile strength and modulus of the HFRP follow the rule of mixture. The concrete filled HFRP tubes exhibited much improved ultimate strength and ductility compared to those with the flax fiber tubes. The axial compression stress-strain curves were analyzed with the existing models. The coefficients of confinement of HFRP were higher than those of glass or carbon fiber based FRPs. © APFIS 2015. All rights reserved.

关键词： Fiber reinforced plastics

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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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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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Effect of glass fiber fabrics isolation layer on the adhesion bond behaviours between CFRP plates and steel substrates 12

Effect of glass fiber fabrics isolation layer on the adhesio...

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作者： He, Jun Xian, Guijun Li, Hui Key Lab. of Structural Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

Strengthening of steel structures with adhesively bonded carbon fiber-reinforced polymer (CFRP) plates has received extensive attentions in recent years. Since galvanic corrosion occurs between CFRP and the steel, glass fiber fabrics (GFF) are generally applied as an isolation layer. The present paper studied the effects of GFF on the bonding performances (such as ultimate strength and bond-slip relationship) between the CFRP and steel substrates. A series of pull-off tests were performed with variables of the thickness of the GFF layer. The testing results shows that the failure mode is the CFRP plate delamination failure, rather than cohesive failure. Based on this failure mode, the bondslip relationship curves is also trapezoidal shape for ductile adhesive and the thickness of the GFF isolation layer has no influence on the bonding performances. © APFIS 2015. All rights reserved.

关键词： Plates (structural components)

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Seismic fragility analysis of steel-concrete composite bridges excited by near-fault ground motions

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2016年 49卷 56-60and77页

作者： Liu, Yang Lu, Dagang Yu, Xiaohui Key Lab of Structural 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 State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

The seismic fragility analysis was conducted for a steel-concrete composite bridge (SCCB) including the effects of the near-fault pulse-like ground motions. A total of 60 real ground motions were selected from the PEER strong earthquake database as the inputs. The global fragility curves and local fragility curves of the bridge were obtained through the fragility analysis. Compared to the fragility results of the far-field earthquake records, it is found that the demands due to the near-fault ground motions are significantly larger than that due to the far-field ground motions. Under the near-fault pulse-like ground motions, the pier is the most fragile component, while the concrete crossbeam and the studs are less fragile. © 2016, Editorial Office of China Civil Engineering Journal. All right reserved.

关键词： Concretes

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Experimental study on the lateral impact of fully clamped circular steel tubes

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Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology 2016年 49卷 28-33页

作者： Zhang, Rong Zhi, Xudong Fan, Feng Wu, Qijian Key Laboratory of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The performance of longitudinal welded steel tubes under drop hammer impact was experimentally *** order to simulate fixed conditions of specimen,loading mechanism platform and clamping device were *** influencing factors included:drop height of hammer,ratio of length to diameter of steel tube,and shape of *** results show that the failure mode of fully clamped tubes is shear failure,and with the increase of the impact energy,the deformation of circular steel tube goes through three stages:elastic small deformation stage,plastic large deformation stage,and shear failure stage. Drop height of hammer and ratio of length to diameter of steel tube have significant effects on strain growth rate,duration of impact and peak impact force. The shape of the plastic hinge is determined by the shape of the impact indenter. © 2016, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.

关键词： Hammers

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Pounding-induced stress wave analysis and mitigation of highway bridges under earthquakes 6

Pounding-induced stress wave analysis and mitigation of high...

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Joint 6th International Conference on Advances in Experimental structural Engineering, AESE 2015 and 11th International Workshop on Advanced Smart Materials and Smart Structures Technology, ANCRiSST 2015

作者： Li, Suchao Guo, Anxin Cui, Lili Mao, Chenxi Li, Hui Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Institute of Engineering Mechanics China Earthquake Administration Harbin150090 China

Seismic colliding between adjacent structures without enough distance may lead to considerable structural damage or even collapse during large earthquakes. Additionally, during the contact-separation process, pounding-induced waves not only increase internal damage of the structure but also have significant effect on the acceleration measurement. To investigate the propagation behavior of the colliding-induced stress wave and the pounding mitigation effects of shape memory alloy pseudo-rubber shock absorber devices (SMAPR-SADs) on adjacent superstructures, a series of shaking table tests on a 1:30 scaled steel highway bridge model are performed. Then, the effect of stress waves on the acceleration signals of bridge structures is firstly investigated. The characteristics of pounding stress waves are analyzed based on wave theory, the cross wavelet transform and wavelet coherence analysis. The amplitude and absolute energy of the stress waves are compared between the original structure and after the installation of SMAPR-SADs. Furthermore, the mitigation mechanism of SMAPR-SADs on pounding-induced stress waves is interpreted. Results show that SMAPR-SAD has stable energy absorption ability and could obviously reduce the amplitude and energy of the pounding stress waves, and also lower the corresponding effect on the accuracy of the measurement system. © International Conference on Advances in Experimental structural Engineering. All rights reserved.

关键词： Shock absorbers

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Temperature and electric-field induced phase transitions, and full tensor properties of C-poled domain-engineered tetragonal 0.63Pb(Mg1/3Nb2/3)−0.37PbTiO3 single crystals

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Physical Review B 2016年第9期93卷 094104-094104页

作者： Limei Zheng Yujia Jing Xiaoyan Lu Ruixue Wang Gang Liu Weiming Lü Rui Zhang Wenwu Cao Condensed Matter Science and Technology Institute Harbin Institute of Technology Harbin 150080 China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150001 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China Department of Mathematics Materials Research Institute The Pennsylvania State University University Park Pennsylvania 16802 USA

The phase-transition sequence of 0.67Pb(Mg1/3Nb2/3)−0.37PbTiO3 (PMN-0.37PT) single crystals driven by the electric (E) field and temperature is comprehensively studied. Based on the strain-E field loop, polarization-E field loop, and the evolution of domain configurations, the E field along the [011]C induced phase transitions have been confirmed to be as follows: tetragonal (T) → monoclinic (MC)→ single domain orthorhombic (O) phase. As the E field decreases, the induced O phase cannot be maintained and transformed to the MC phase, then to the coexistence state of MC and T phases. In addition, the complete sets of dielectric, piezoelectric, and elastic constants for the [011]C-poled domain-engineered PMN-0.37PT single crystal were measured at room temperature, which show high longitudinal dielectric, piezoelectric, and electromechanical properties (ɛ33T=10661,d33=1052pC/N, and k33=0.766). Our results revealed that the MC phase plays an important role in the high electromechanical properties of this domain-engineered single crystal. The temperature dependence of the domain configuration revealed that the volume fraction of the MC phase decreases with temperature accompanied by the reduction of ɛ33T,d31, and k31 due to the substantially smaller intrinsic properties of the T phase.

关键词： Electric polarization Ferroelectricity Phase transitions Piezoelectricity Ferroelectrics Piezoelectrics Relaxor ferroelectrics Polarization

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Ultrasonic guided waves sensing using optical fiber sensor 7

Ultrasonic guided waves sensing using optical fiber sensor

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7th International Conference on structural Health Monitoring of Intelligent Infrastructure, SHMII 2015

作者： Zhou, W. Li, H. Dong, Y. Wang, A. 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 National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology Harbin150001 China

Optical fiber sensors have been proven that they have potential as ultrasonic guided waves sensor for structural health monitoring and damage detection. They can be used to receive acoustic emission signals from dynamic structural damages or guided waves propagating in waveguide and excited by ultrasonic actuators. Optical fiber sensors based on Mach-Zehnder interferometer were investigated in this work. Their sensing properties were explored experimentally using Lamb waves excited by a piezoelectric wafer in an aluminum plate. Spiral shape with different size was selected to increase their sensitivity. Experiments were also conducted to examine the voltage responses received by this type of sensor, and investigate results of tuning frequency. © 2015, International Society for structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved.

关键词： structural health monitoring

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