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基于超声波技术的公路桥梁结构病害检测方法 被引量:3
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作者 陈卫 《自动化应用》 2023年第7期176-178,共3页
与传统公路桥梁结构破坏性检测相比,无损检测技术可以在不损坏桥梁结构的前提下,检测其内部病害,为公路桥梁的安全运行提供了保障。基于此,为进一步了解公路桥梁结构中存在的病害,提高公路桥梁的服务质量,本文以某公路桥梁为主要研究对... 与传统公路桥梁结构破坏性检测相比,无损检测技术可以在不损坏桥梁结构的前提下,检测其内部病害,为公路桥梁的安全运行提供了保障。基于此,为进一步了解公路桥梁结构中存在的病害,提高公路桥梁的服务质量,本文以某公路桥梁为主要研究对象,先分析了超声波检测技术原理,然后分别检测与分析了公路桥梁结构的伸缩缝病害、桥面病害和桥台结构病害等方面,并提出了相应的改善措施。经实践证明,超声波检测技术在公路桥梁结构病害检测方面的应用取得了良好的检测效率。 展开更多
关键词 超声波技术 无损检测技术 路桥梁结构 病害检测 养护措施
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Structure and behavior of floor system of two super high-speed railway Changjiang composite bridges 被引量:3
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作者 张晔芝 张敏 《Journal of Central South University》 SCIE EI CAS 2011年第2期542-549,共8页
Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large brid... Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large bridges in the world. These two types of railway floor systems of the two bridges have never been used in China before. The problem how to conform the deformations and stress levels of the railway floor system of WTC Bridge was studied. After finite element analysis and comparison,the plan of arranging one expansion stringer every two panels in railway floor system were proposed and good effect was obtained. Because of the application of three trusses,the allocation of the loads acted on the deck in three trusses is different and varies in different places of NDC Bridge. This problem was studied by model experiment and 3D finite element analysis. The results of 3D FEM analysis coincide with the model test results. The allocation rule of the loads acting on the deck in three trusses was presented. Because of the application of monolithic decks,the stiffness and structural integrity of NDC Bridge are high. 展开更多
关键词 high-speed railway composite mechanics characteristics floor system Wuhan Tianxingzhou Changjiang Bridge Nanjing Dashengguan Changjiang Bridge
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Longitudinal forces of continuously welded track on high-speed railway cable-stayed bridge considering impact of adjacent bridges 被引量:32
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作者 戴公连 闫斌 《Journal of Central South University》 SCIE EI CAS 2012年第8期2348-2353,共6页
A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile fini... A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile finite element model of the cable-stayed bridge was established. Taking a bridge group including 40-32m simply-supported beam and (32+80+112)m single-tower cable-stayed bridge and 17-32m simply-supported beam on the Kunming-Shanghai high-speed railway as an example, the characteristics of CWR longitudinal force on the cable-stayed bridge were studied. It is shown that adjacent bridges must be considered in the calculation of the track expansion force and bending force on cable-stayed bridge. When the span amount of adjacent bridges is too numerous, it can be simplified as six spans; the fixed bearing of adjacent simply-supported beams should be placed on the side near the cable-stayed bridge; the track expansion device should be set at the bridge tower to reduce the track force near the bridge abutment. 展开更多
关键词 high-speed railway continuously welded track cable-stayed bridge simply-supported beam
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An analysis of the structural design of highway bridges in Mountainous Areas
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作者 XIN Peng LI Yanbing 《International English Education Research》 2016年第4期76-78,共3页
Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal desi... Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal design scheme of bridge structure is discussed from the aspects of safety, economy and so on in this paper. 展开更多
关键词 Highway in mountain area BRIDGE Structure design Type of bridge
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Design of steel box girder for Taizhou Yangtze River Highway Bridge
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作者 Ding Lei Shan Hongwei Zhou Qing Zheng Benhui 《Engineering Sciences》 EI 2011年第2期57-63,共7页
Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technica... Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technically mature besides beautiful appearance. Straight web plates of the steel box girder in longitudinal direction are proposed in order to ensure the integrity of the steel box girder, and to keep the stress of the steel box girder continuous in the middle pylon, as well as to reduce the gradient of the middle pylon columns. The cross section of the box girder has one box with three cells. Solid-web diaphragm plate with good integrity and high torsional stiffness is adopted. The lifting lugs are utilized in the anchors of suspender cable. In this paper, selection of the cross section of the steel box girder, the general structure design, local structure design and main structure calculation results of Taizhou Yangtze River Bridge are introduced emphatically. 展开更多
关键词 Taizhou Yangtze River Highway Bridge three-pylon suspension bridge steel box girder DESIGN
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Concrete Placement for Bridge Decks on an Expressway Extension Project
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作者 Janusz Holowaty 《Journal of Civil Engineering and Architecture》 2015年第11期1354-1361,共8页
The paper presents examples of technological designs for concrete placement in road bridges constructed during the S5/S 10 expressway extension in Poland. The project included eight concrete or composite bridge struct... The paper presents examples of technological designs for concrete placement in road bridges constructed during the S5/S 10 expressway extension in Poland. The project included eight concrete or composite bridge structures with different numbers of decks. The concrete placement technology is presented for the following bridge decks: slabs cast-in-situ, composite with precast or VFT (prefabricated composite beam) beams and mixed with cast in situ slabs and VFT-WIB (filler beam) beams. Continuous concrete placement was adopted for almost all the bridge superstructures except the mixed-type decks where construction joints were necessary. To control shrinkage, formwork deformations and existing restraints, the concrete was poured in layers and in stages. The design pace of concrete placement was moderate to be regulated at site without compromising safety and quality. The placement methods enabled both efficient and safe concrete pours. 展开更多
关键词 Concrete bridge CURING flesh concrete placement and consolidation shrinkage.
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Elastic-plastic seismic response of CRTS II slab ballastless track system on high-speed railway bridges 被引量:11
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作者 YAN Bin LIU Shi +2 位作者 PU Hao DAI GongLian CAI XiaoPei 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第6期865-871,共7页
China railways track structure II (CRTS II) slab ballastless track on bridge is one kind of track structures unique to China. Its main bearing component of longitudinal force is the continuous base plate rather than ... China railways track structure II (CRTS II) slab ballastless track on bridge is one kind of track structures unique to China. Its main bearing component of longitudinal force is the continuous base plate rather than rail. And the track-bridge interaction is weakened by the sliding layer installed between base plate and bridge deck. In order to study the dynamic response of CRTS II slab ballastless track on bridge under seismic action, a 3D nonlinear dynamic model for simply-supported bridges and CRTS II track was established, which considered structures such as steel rail, fasteners, track plate, mortar layer, base plate, sliding layer, bridge, consolidation, anchors, stoppers, etc. Then its force and deformation features under different intensities of seismic excitation were studied. As revealed, the seismic response of the system increases with the increase of seismic intensity. The peak stresses of rail, track plate and base plate all occur at the abutment or anchors. Both track plate and base plate are about to crack. Besides, the rapid relative displacement between base plate and bridge deck due to the small friction coefficient of sliding layer is beneficial to improve the seismic performance of the system. During the earthquake, a large vertical displacement appears in base plate which leads to frequent collisions between stoppers and base plate, as a result, stoppers may be damaged. 展开更多
关键词 railway engineering simply supported beam ballastless track seismic response elastic-plastic collision finite element analysis
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