Rehabilitation of existing structures with fiber reinforced plastic(FRP)has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high specific stiffness.The strain...Rehabilitation of existing structures with fiber reinforced plastic(FRP)has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high specific stiffness.The strain coordination results of 34 reinforced concrete beams(four groups)strengthened with different methods were presented including external-bonded or near-surface mounted glass or carbon FRP or helical rib bar in order to study the strain coordination of the strengthening materials and steel rebar of RC beam.Because there is relative slipping between concrete and strengthening materials(SM),the strain of SM and steel rebar of RC beam satisfies the double linear strain distribution assumption,that is,the strain of longitudinal fiber parallel to the neutral axis of plated beam within the scope of effective height(h0)of the cross section is in direct proportion to the distance from the fiber to the neutral axis.The strain of SM and steel rebar satisfies the equation εGCH=βεsteel,where the value of β is equal to 1.1-1.3 according to the test results.展开更多
This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding...This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.展开更多
In order to reveal the flexural behavior of hybrid fiber reinforced high-performance concrete deep beam, 16 high-performance concrete deep beams of different fiber volume content have been tested according to the stat...In order to reveal the flexural behavior of hybrid fiber reinforced high-performance concrete deep beam, 16 high-performance concrete deep beams of different fiber volume content have been tested according to the state standards and testing methods. The effects of hybrid fiber on the yield moment and bending bearing capacity of the cross-section have been analyzed, the calculation method for the bending capacity＇ is discussed and the propositional formula are provided as well. Results shoxv that the flexural properties increased obviously when add ≤1.0% of volume content steel fibers and ≤0.11% of volume content polypropylene fibers in to deep beam. The results are useful to the further amendments of fiber reinforced concrete structure technical regulation （CECS 38：2004）.展开更多
基金Project(11B033)supported by the Foundation for Excellent Young Scholars of Hunan Scientific Committee,ChinaProject(116001)supported by the Consultative Program of the Chinese Academy of Engineering+1 种基金Project(11JJ6040)supported by the National Natural Science Foundation of Hunan Province,ChinaProject(2010GK3198)supported by the Science and Research Program of Hunan Province,China
文摘Rehabilitation of existing structures with fiber reinforced plastic(FRP)has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high specific stiffness.The strain coordination results of 34 reinforced concrete beams(four groups)strengthened with different methods were presented including external-bonded or near-surface mounted glass or carbon FRP or helical rib bar in order to study the strain coordination of the strengthening materials and steel rebar of RC beam.Because there is relative slipping between concrete and strengthening materials(SM),the strain of SM and steel rebar of RC beam satisfies the double linear strain distribution assumption,that is,the strain of longitudinal fiber parallel to the neutral axis of plated beam within the scope of effective height(h0)of the cross section is in direct proportion to the distance from the fiber to the neutral axis.The strain of SM and steel rebar satisfies the equation εGCH=βεsteel,where the value of β is equal to 1.1-1.3 according to the test results.
文摘This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.
基金This study was supported by Science Foundation for Young Scientists of Hubei Province Educational Committee of China.
文摘In order to reveal the flexural behavior of hybrid fiber reinforced high-performance concrete deep beam, 16 high-performance concrete deep beams of different fiber volume content have been tested according to the state standards and testing methods. The effects of hybrid fiber on the yield moment and bending bearing capacity of the cross-section have been analyzed, the calculation method for the bending capacity＇ is discussed and the propositional formula are provided as well. Results shoxv that the flexural properties increased obviously when add ≤1.0% of volume content steel fibers and ≤0.11% of volume content polypropylene fibers in to deep beam. The results are useful to the further amendments of fiber reinforced concrete structure technical regulation （CECS 38：2004）.
