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RISS 인기검색어
- 검색키워드
- 저자 : Jiexin Luo (검색결과 2 건)
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Haifeng Li,Jun Luo,Feng Han,Jiexin Luo 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
An investigation was conducted to evaluate the seismic behavior of a new type of steel box-section bridge piers with embedded energy dissipation shell plates. In this study, two sets of the new steel box-section bridge piers were designed and pseudo-static tests were carried out on ten steel box bridge piers under constant axial force, with a horizontal cyclic load on top of the piers. The change regularities of the failure mode, the patterns of local buckling, the load–displacement hysteresis curve and its curve skeletons, and the load-strain hysteresis curves of the specimens were analyzed. The rules of horizontal stiff ener spacing on embedded shell plates, the axial compression ratio, the embedded shell strength, and the layout of longitudinal ribs in the box-section wallboards were obtained to evaluate their infl uence on the seismic behavior of the new-type steel piers. The test results indicated that, after installing the embedded shells, the deformation ability of steel box-section bridge piers was enhanced and their ductility was improved. The eff ects of axial compression ratio and the space of transverse stiff eners in embedded shells on the seismic behavior of the new steel piers were signifi cant. When the space of the horizontal stiff eners on the embedded shells and the axial compression ratio become smaller, the bearing capacity and ultimate displacement capability of the specimens would be greater, the descent segment of the curve skeleton would be more gradual, and the deformability and ductility of the new-type steel piers would be better. The eff ects of setting longitudinal stiff ening ribs and enhanced embedded shell strength on the bearing capacity and ductility of the steel box bridge piers were relatively small. Based on the experimental results, calculation equations were established for stable bearing capacity and maximum deformation of the new-type steel piers, under the constant axial force and horizontal cyclic loading, in order to promote their seismic design.
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Tests of New Box Steel Replaceable Piers Under Axial Compression
Haifeng Li,Jun Luo,Feng Han,Jiexin Luo 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
A new recoverable box steel bridge column with bottom replaceable piers was proposed. The axial compressive tests were initially performed on fourteen specimens which have three diff erent types of steel replaceable piers. Results demonstrate that all three types of structural measures improve the specimens’ strength and deformation performance. Compared to the installing of the low yield point steel plates, the embedded shell plates and the longitudinal ribs on the box walls result in a greater increase of the specimens’ bearing capacity and ductile performance. When the specimen has the longitudinal ribs installed on the box walls and the smaller space of transverse stiff eners, its bearing capacity is increased. The specimens’ ductility is improved when the space of transverse stiff eners and the height of low yield point steel plates decrease. The specimens’ bearing capacity and ductility are only slightly aff ected by the variation of the embedded shell’s radian. Finally, a simplifi ed calculation formula for the axial compressive bearing capacity of the bottom replaceable piers is proposed.
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