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Full-scale experimental and numerical investigation on performance enhancement of slab bridge based on arched corrugated steel exoskeleton

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Structures 2025年 78卷

作者： Wang, Xiaoming Chen, Yu Liu, Liang Zhao, Jianling Wu, Qian Sun, Chenjing Qiu, Hongjie Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology Chang'an University Shaanxi Xi'an710064 China School of Highway Chang'an University Shaanxi Xi'an710064 China National Key Laboratory of Bridge Safety and Resilience Beijing University of Technology Beijing100124 China China Railway Design Corporation Tianjin300142 China

As a widely used structure for small-span bridges, concrete slab bridges face an increasingly prominent risk of deterioration and even collapse due to heavy vehicle load and environmental corrosion, posing a serious threat to bridge safety. To address these challenges and meet growing transportation demands without disrupting traffic, an innovative active reinforcement method for small-span slab bridges based on Arch Corrugated Steel Exoskeleton (ACSE) is proposed in this paper. The proposed reinforcement approach enhances the load-bearing capacity by applying precompression to ACSE, allowing it to actively share both the dead and live load of the slab bridge. The reinforcement procedure and connections of ACSE to slab bridges are carefully designed. To evaluate the performance of this method, three full-scale experiments were conducted on 5-meter-span slabs. The results show that the ACSE method increases the flexural ultimate bearing capacity of the slab by 22.78 % and shares up to 60.00 % of the slab's self-weight. Additionally, a numerical model for ACSE reinforcement is validated using experimental data and utilized to explore the feasibility of different ACS-slab connections as well as different arched corrugated steel (ACS) corrugations. Further parameter analysis reveals that the bearing capacity of the test slabs increases when the thickness and corrugation of the ACS increase. The dead load sharing effect of the ACSE is not significantly influenced by the connection type but is heavily affected by the applied precompression and the stiffness of the ACS. Moreover, the live load sharing effect becomes more pronounced with larger ACS plate thicknesses and cross-sectional sizes. © 2025 Institution of Structural Engineers

关键词： Concrete slabs

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Research on Bending Performance of RC Beams Reinforced by Prestressed TRM 14

Research on Bending Performance of RC Beams Reinforced by Pr...

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14th International Conference on Intelligent Computation technology and Automation, ICICTA 2021

作者： Ren, W. Zhang, H. Liu, H. Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Transport Chang'an University Shaanxi Xi'an710064 China Road and Bridge International CO. LTD. Beijing100000 China Jining Hongxiang Highway Survey and Design CO. LTD. Shandong Jining272000 China

To solve the problems of Low material strength utilization rate and unsatisfactory reinforcement effect in the concrete structure reinforced by bonding method, the self-developed tensioning and anchoring equipment was used to carry out the experimental study of prestressed TRM reinforcement for RC beams. The influence of prestressing TRM on bearing capacity, fracture characteristics and ductility were studied through 3 RC beam tests. It was concluded that the crack load, yield load and ultimate load can be significantly increased by prestressing TRM reinforcement, and the yield load can be increased by more than 30%. The prestressed TRM reinforcement beam had a good constraint effect on the cracks of the beam;After TRM reinforcement, the ductility of beams decreased to a certain extent. In this paper, the final failure of the test beam was caused by the tensile failure of the fiber textile, and the yield load of the beam increases obviously, which indicates that the prestressing force on the fiber textile can effectively improve the strength utilization ratio of the material. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Bearing capacity

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Research on the Progressive Failure-collapse Dynamic Behavior of Steel Truss-concrete Composite bridge

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Zhongguo Gonglu Xuebao/China Journal of Highway and Transport 2022年第11期35卷 147-159页

作者： Zheng, Xiao-Bo Zhang, Gang Huang, Lai-Xi Tang, Chen-Hao Xiong, Xin Ding, Yu-Hang School of Highway Chang'an University Shaanxi Xi'an710064 China Key Laboratory of Transportation Industry of Bridge Detection Reinforcement Technology Shaanxi Xi'an710064 China Dongguan Road-Bridge Investment & Construction Co. Ltd. Guangdong Dongguan523415 China

The damages in bridge members and the collapses in entire structures usually happens, with the arises in the traffic, resulting heavy injures and economic losses. Compared to other bridge structural systems, the steel truss-concrete composite bridge is lack of redundancy, indicating that this type of bridge is venerable to the structural collapse caused by the initial failures in members under heavy traffic load. Thus, it is vitally important for the theory and engineering to determine the collapse mechanism and mode of steel truss bridge. This paper presents a study for member significance, damaged structure and dynamic collapse performances of a steel truss-concrete composite continuous beam bridge, using elastic energy and explicit dynamic numerical method. The results indicate that the minimum redundancy factor is 1.94 for the damaged bridge with failed lower chord in the area of the largest positive bending moment in side span, while the minimum factor is 1.61 for the damaged bridge with failed bar in the vicinity of the side support. The damaged bridge, with the failed lower chord in the area of positive bending moment, collapses following the mechanism of rotating hinge. This mechanism has long failure paths, with the maximum vertical displacement of 60.1 cm before the entire collapse. In contrast, the damaged bridge, with the failed bar in the vicinity of support, collapses following the mechanism of slip surface. Leading the critical brittle collapse, this mechanism has extremely short failure paths, with the merely maximum vertical displacement of 9.1 cm before the entire collapse. Thus, the mechanism of slip surface, caused by the failure in bars near supports, is the most critical for steel truss-concrete composite bridges, and is prevented by special design. This research, on the failure paths of steel truss-concrete composite bridge, investigates the member significance and collapse mechanism, providing the theoretical basis and design method for enhan

关键词： Ductile fracture

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Fluid-solid coupling effect of different forms of deep-water piers under earthquake

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Zhendong yu Chongji/Journal of Vibration and Shock 2022年第21期41卷 7-18页

作者： Zhou, Mi Jiang, Run Li, Jiulong Key Laboratory for Old Bridge Detection and Reinforcement Technology The Ministry of Transportation Chang'an University Xi'an710064 China Zhejiang Jiaogong Advanced-Grade Highway Maintenance Co. Ltd. Hangzhou310051 China China Design Group Co. Ltd. Nanjing210014 China

Under action of earthquake, water-structure interaction effect makes submerged part of structure produce hydrodynamic pressure. Here, to study effects of hydrodynamic effect on seismic responses of different forms of piers, and distribution laws of hydrodynamic pressure on piers, taking a large round pier, a rectangular pier and a pile group foundation with high pile cap as examples, fluid-solid coupling numerical calculation models for 3 examples were established by using the finite element method based on potential fluid, and their natural vibration characteristics analyses, seismic response analyses and hydrodynamic pressure analyses under different water depth conditions and different seismic wave inputs were performed. The results showed that increase in water depth can reduce natural vibration frequencies and increase internal force responses of 3 pier-forms;upstream surface of rectangular pier in direction of earthquake input is plane, interaction between rectangular pier and water is more obvious than that between circular pier and water, and this interaction can produce larger hydrodynamic pressure;when a certain water depth is reached, hydrodynamic pressure on circular and rectangular piers firstly increases and then decreases along pier height;hydrodynamic pressure at center position of upstream surface is the largest and gradually decreases to both sides;seismic response and hydrodynamic pressure of middle pile of pile group foundation with underwater high pile cap are smaller than those of side piles;after water depth submerges pile cap, pile cap bears most of hydrodynamic pressure, and action point of total hydrodynamic pressure on pile foundation is at position of 0.6 pile length. © 2022 Chinese Vibration Engineering Society. All rights reserved.

关键词： Seismic response

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Study on reasonable restraint system of double-deck frame bridge subjected to seismic action 14

Study on reasonable restraint system of double-deck frame br...

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14th International Conference on Intelligent Computation technology and Automation, ICICTA 2021

作者： Zong, X.M. Liu, Y. Yang, F. Wu, J. Wang, X.D. Zhou, M. China United Northwest Institute for Engineering Design and Research Co. Ltd Shanxi 710077 China Key Laboratory for Bridge Detection and Reinforcement Technology of the Ministry of Transportation Chang'an University Shanxi Xi'an710064 China Guangdong Communication Planning &Design Institute Co. Ltd. Guang Dong Guangzhou510507 China

In this paper, in order to improve the seismic performance of frame type double deck overpass bridge under seismic action, the most reasonable restraint system of frame double-deck overpass is studied. Based on the typical frame-type double-deck continuous overpass-hushen bridge, the finite element analysis model of the solid bridge is established. Then, from six different directions, eight different constraint combinations are established. Finally, through the analysis of the bridge direction control point of the internal force, displacement and other parameters, research and contrast the frame double-deck overpass under different constraints of the seismic response. The results show that the combination of rubber bearing, steel wire rope and concrete block can effectively limit the relative displacement between piers and beams, and reduce the internal force response of Piers and residual deformation of supports. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Piers

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Experimental study on the sensitive parameters of non-destructive test method for the cable based on the leakage magnetic principle 2

Experimental study on the sensitive parameters of non-destru...

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2nd International Conference on Environmental Prevention and Pollution Control Technologies, EPPCT 2020

作者： Dong, Zhenhua Fan, Ping Li, Pengfei Mao, Yan Bridge and Tunnel Research Center Research Institute of Highway Science of Transport Ministry Beijing100088 China Key Laboratory of Old Bridge Inspection and Reinforcement Technology Industry Beijing100088 China

The nondestructive testing (NDT) technique of steel rope based on the leakage magnetic principle has been extensively applied to the cable. In view of the difference of geometric characteristics, structures, loading between steel rope and cable, the applicability of the leakage magnetic NDT and the sensitive parameters on detection accuracy should be studied. So a cable specimen with local defects was designed and fabricated, and then the leakage magnetic testing technique was applied. The experimental electrical signal output of the cable were compared and analyzed. The results show that the accuracy of the test results is strictly related to the geometric characteristics of the test instrument, the depth of internal defects, the height of sensor removal, the sensitivity coefficient of the magnetically sensitive element, the defect spacing, etc., and the qualitative evaluation and individual quantitative index of the cable defects are proposed. The above conclusions can provide data support for the test quantitative index and the application of nondestructive testing technique. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Magnetic leakage

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Study on seismic behavior of single tower cable-stayed bridge with overload yield bearing in high-intensity regions

Study on seismic behavior of single tower cable-stayed bridg...

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2020 International Conference on Intelligent Transportation, Big Data and Smart City, ICITBS 2020

作者： Zong, Xuemei Liu, Pingjun Yang, Fang Liu, Gang Zhou, Mi China United Northwest Institute for Engineering Design Research Co. Ltd Xi'an710077 China State Key Lab. for Old Bridge Detection and Reinforcement Technology Ministry of Transportation Chang'An University Xi'an710064 China

ISBN: (纸本)9781728166971

In order to study the seismic isolation bearing problem of the single tower cable-stayed bridge under earthquake action, the seismic performance of the bridge is improved at the conceptual design stage. For the overload yield bearing, a single tower cable-stayed bridge in the high intensity area is taken as the research object. The full-bridge three-dimensional finite element model was established by SAP2000 spatial structure analysis and design program. The pile-soil interaction was considered, the vertical joint of the pylon was simulated, and the structural natural vibration characteristics, response spectrum and nonlinear seismic response time history analysis were carried out. meanwhile, the influence of the shear of bearing on the natural vibration period and seismic response of single-tower cable-stayed bridge is also studied in this paper. The results show that under the nonlinear time history analysis, the bearing will be sheared under the E1 probability. After the shear, the structural period is prolonged, the seismic response of the auxiliary pier and the side pier is greatly improved and the plastic hinge can be avoided. Under the E1 probability and the E2 probability, considering the shear of the bearing, the seismic response of each main component of the structure is smaller than the ultimate bending moment of the section, and the damping effect is good. The research results show that the overload yield bearing has a high promotion value and can provide reference for the seismic design of the same type of bridge. © 2020 IEEE.

关键词： Cable stayed bridges

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Research on protection monitoring of existing subway tunnel based on high precision automatic monitoring system 2

Research on protection monitoring of existing subway tunnel ...

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2020 2nd International Conference on Civil, Architecture and Urban Engineering, ICCAUE 2020

作者： Juan, H.U. Zhifan, W.E.I. School of urban construction Zhejiang Shuren University HangzhouZhejiang310015 China Key Laboratory of traffic industry for old bridge detection and reinforcement technology of Chang'an University Xi’anShaanxi710064 China Zhejiang Engineering Survey Institute Ningbo Zhejiang315012 China

In order to ensure the safety of the subway in the process of excavation, combining with the geographical location and geological situation of the project, with the high-precision automatic monitoring system, it sets up the corresponding monitoring points to protect and monitor the subway near the project, so as to ensure the normal construction of the foundation pit Iron impact is minimized. The monitoring results were in line with the requirements of the specification, providing guarantee for the subsequent construction. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Monitoring

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Seismic response of rocking double-column bridge bents with external hysteretic dissipaters

Seismic response of rocking double-column bridge bents with ...

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2020 International Conference on Intelligent Transportation, Big Data and Smart City, ICITBS 2020

作者： Zhou, Yulong Zhang, Jinquan Cheng, Shoushan He, Haifang Dong, Zhenhua Qiang, Han Key Laboratory of Old Bridge Inspection and Reinforcement Technology Industry Research Institute of Highway Science of Transport Ministry Beijing100088 China Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing100124 China

ISBN: (纸本)9781728166971

Rocking bent is a potential alternative for seismic resistant and post-earthquake resilience of bridges. In order to study the seismic response of rocking double-column bridge bents with external hysteretic dissipaters, this paper developed an analytical model considering the impact and dissipater fracture. The benefits of dissipaters for rocking bridge bents were validated compared with the free-rocking bent. The influence of the hysteretic dissipater parameters on the seismic response of rocking bridge bent were also analyzed. The analysis considers far-field and near-field earthquake records. The study results show that the external hysteretic dissipaters have attractive benefit on the seismic response and stability of rocking double-column bridge bents. The dissipater fracture and overturning are sensitive to the distinctive pulses of near-field records, which is crucial from the design point of view. © 2020 IEEE.

关键词： Seismic response

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Experiment of Shear Performance of Epoxy Resin Joints with Single keys in Precast Concrete Segmental bridges 5

Experiment of Shear Performance of Epoxy Resin Joints with S...

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2020 5th International Conference on Minerals Source, Geotechnology and Civil Engineering, MSGCE 2020

作者： Xiaorong, Yao Hao, Chen Gao, Cheng Jilin Communications Polytechnic Changchun Jilin Province China School of Highway Chang'an University Xi'an Shaanxi Province China Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Xi'an Shaanxi Province China

In order to research the effect of epoxy resin thickness on the shear capacity of the epoxy resin joints of precast concrete segmental bridges, segmental bridges, one group of 6 full-depth single shear key specimens were cast and tested. Based on the experimental results, ultimate shear loads were recorded, cracking patterns and failure modes were observed. The normalized shear stress-vertical relative slip curves were investigated, and some design formulas for assessing the shear capacity of epoxy resin joints were compared and analysed. It is found that the thicker the epoxy resin thickness with the single keys is, the higher the shear capacity of epoxy resin joints is, the larger the normalized shear stress is, and the better plastic deformation capacity of epoxy resin joints is. BUYUKOZTURK O formula overestimates the shear capacity of epoxy resin joints with single keys, and several other design formulas underestimate shear capacity of epoxy resin joints with single keys;it is not appropriate to ignore the effect of epoxy resin thickness on the shear capacity of the epoxy resin joints. © Published under licence by IOP Publishing Ltd.

关键词： Epoxy resins

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