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Research on controlling long-term performance by tensioning post tendon of long-span continuous rigid-frame bridges 被引量:1
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作者 HE Mingxuan ZHENG Yifeng ZHAO Qun 《Global Geology》 2013年第4期213-216,共4页
The problems like cracking of the girder in the mid-span and the ever-increasing vertical deflection appear during the long term usage of the long-span continuous rigid-flame bridge. Post-tension tendon with re- serve... The problems like cracking of the girder in the mid-span and the ever-increasing vertical deflection appear during the long term usage of the long-span continuous rigid-flame bridge. Post-tension tendon with re- served duct can increase the pre-stress of the main beam effectively, and decrease the long term span deflection in order to improve the performance of the girder. At the same time, the proper tension position is very crucial to optimise the stress distribution of the bridge and control the deflection increase. Combining with practical en- gineering, the authors analyze the influence of different positions of post-tension tendon ( including top-, web- and bottom plate tendons) on the stress and deflection of the main beam, and find out the optimal position of post tendon. 展开更多
关键词 continuous rigid-frame bridge long term performance post tendon optimal tension position
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Effect of concrete creep on pre-camber of continuous rigid-frame bridge
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作者 贺国京 李媛媛 +1 位作者 邹中权 段靓靓 《Journal of Central South University》 SCIE EI CAS 2008年第S1期337-341,共5页
The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculat... The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculated with two Chinese codes was discussed.Based on the calculations,the pre-camber of a pre-stressed concrete continuous rigid-frame box bridge was computed for construction control purpose.The results show that the short-term creep coefficient and long-term creep coefficient calculated with the CC-1985 are larger than those calculated with the CC-2004,while the medium-term creep coefficient calculated with the CC-1985 is smaller than that calculated with the CC-2004.The difference of creep deformation calculated with these two codes is small,and the influences of concrete creep on the pre-camber for most of the segments are negligible.The deflections and stresses of the box girder measured during the construction stages agree very well with the predictions. 展开更多
关键词 CREEP pre-stressed concrete continuous rigid-frame bridge CANTILEVER CASTING method PRE-CAMBER
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Topographic effects on seismic response of long-span rigid-frame bridge under SV seismic wave
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作者 王蕾 赵成刚 屈铁军 《Acta Seismologica Sinica(English Edition)》 CSCD 2008年第3期311-318,333,共9页
Seismic ground motions of two neighboring mountains and the free surface between them are calculated under the SV seismic waves with three different incident angles. The results are then taken as the inputs of multi-p... Seismic ground motions of two neighboring mountains and the free surface between them are calculated under the SV seismic waves with three different incident angles. The results are then taken as the inputs of multi-point seismic excitations for the foundation of a long-span bridge built over the valley in the analysis considering the integrated influence of traveling wave and topography. On the basis of a dynamic analytical method, a finite element model is created for the seismic responses of a four-span rigid-frame bridge of 440 m. The pier-top displacement and the pier-bottom internal force of the bridge are calculated. Then the results are compared with those considering traveling-wave effect only. The conclusions can serve as a seismic design reference for the structures located on the complex mountain topography. 展开更多
关键词 traveling-wave effect topographic effect multi-point excitation rigid-frame bridge seismic response
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Seismic Analysis for Rigid-Framed Prestressed Reinforced Concrete Bridge in Tianjin Light Railway
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作者 丁阳 李楠 李忠献 《Transactions of Tianjin University》 EI CAS 2004年第4期265-269,共5页
The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the ... The seismic analysis of a rigid-framed prestressed concrete bridge in Tianjin Light Railway is performed. A 3-D dynamic finite element model of the bridge is established considering the weakening effect caused by the soft soil foundation. After the dynamic characteristics are calculated in terms of natural frequencies and modes, the seismic analysis is carried out using the modal response spectrum method and the time-history method, respectively. Based on the calculated results, the reasonable design values are finally suggested as the basis of the seismic design of the bridge, and meanwhile the problems encountered were also analyzed. Finally, some conclusions are drawn as: 1) Despite the superiority of rigid-framed prestressed concrete bridge, the upper and lower ends of the piers of the bridge are proved to be the crucial parts of the bridge, which are easily destroyed under designed earthquake excitations and should be carefully analyzed and designed; 2) The soft soil foundation can possibly result in rather weakening of the lateral rigidity of the rigid-framed bridge, and should be paid considerable attention; 3) The modal response spectrum method, combined with time-history method, is suggested for the seismic analysis in engineering design of the rigid-framed prestressed concrete bridge. 展开更多
关键词 light railway rigid-framed bridge prestressed reinforced concrete seismic analysis dynamic characteristics response spectrum TIME-HISTORY
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Static Load Test Detection of Continuous Rigid- Frame Railway Bridge
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作者 Jing Cao Lei An 《Journal of Architectural Research and Development》 2023年第5期1-7,共7页
The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for br... The quality of the continuous rigid-frame railway bridge is related to the safety of train operation,so it is necessary to test its stiffness,strength,and other indicators.Static load test is a common technique for bridge inspection.This article summarizes the purpose of the static load test for a continuous rigid-frame railway bridge,including the required equipment,operation methods,etc.,and lists examples to analyze the operation process and precautions of static load test,hoping to provide reference information for relevant personnel. 展开更多
关键词 Railway bridge rigid-frame Static load test
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A New Method on Resolving the Rotation in the Plane of Skew Bridges 被引量:1
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作者 KANG Jun-tao ZHENG Jun-jie WANG Guo-ding FANG Qin-han DING Rui 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第6期1081-1084,共4页
The rotation of skew bridges in the plane is a common phenomenon in engineering. Traditional measure is to setup pins or limiting displacement with lateral bearings, but the result is not satisfactory. In order to sol... The rotation of skew bridges in the plane is a common phenomenon in engineering. Traditional measure is to setup pins or limiting displacement with lateral bearings, but the result is not satisfactory. In order to solve this problem, the reason for the rotation in the plane is found by philosophy analysis and an idea regarding the application of slantleg frame skew bridges without abutment is brought forward in this paper. Theory and engineering practices indicate that slant-leg rigid frame bridges without abutment can restrain the rotation of skew bridges in the plane to the utmost extent because of its structural characteristics and can fundamentally solve the tough defect of skew bridges. 展开更多
关键词 slant-leg rigid frame bridges without abutment skew bridge rotation in the plane
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