Papers by Keyword: Specially Shaped Column

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Authors: Pu Yang, Jing Tang
Abstract: Using flexibility-based finite element method based on fiber model, several experiments of reinforced concrete specially shaped columns under cyclic loading which cross section is ‘L’, ‘T’ and ‘+’ shape with different longitudinal reinforcement and hoop reinforcement have been simulated, and the seismic behavior of columns such as strength, ductility and energy dissipation are analyzed. Results from the analytical study indicate that: 1) ductility of the column increases as quantity of hoop reinforcement increases. 2) strength capacity of the column increase linearly as ratio of longitudinal reinforcement increase, but is not seriously affected by hoop reinforcement; 3) energy dissipation capacity of the column is not significantly affected by hoop and longitudinal reinforcement, particularly in slightly nonlinear range.
1300
Authors: Yan Jun Li, Ping Liu
Abstract: Four specially shaped columns with HRB500 reinforcement were tested under low cyclic loading. The hysteretic curve, yield load, ultimate load, displacement ductility and rigidity degradation were compared in order to research the effect of axial compression ratio on ductility and bearing capacity of specially shaped column with HRB500 reinforcement. It is shown that the axial compression ratio has greater influence on ductility and bearing capacity. With the increase of axial compression ratio, the bearing capacity of HRB500 reinforcement concrete specially shaped column can be enhanced while the deformation capacity becomes worse. The hysteretic characteristic of specially shaped columns with HRB500 reinforcement is improved and the stiffness degeneration becomes slow with the decrease of axial compression ratio.
1066
Authors: Xian Rong, Jian Xin Zhang, Yan Yan Li
Abstract: Based on the low cyclic loading experiments on three interior joints with specially shaped columns, in which one of them was reinforced by polypropylene fiber in the core zone of joint, another steel fiber, the other was not reinforced, the authors compare the results in terms of damage characteristic, bearing capacity, displacement and ductility, hysteretic curve of the moment-rotation, rigidity degradation and energy dissipation. It is shown that seismic behavior of specially shaped column interior joints reinforced by fiber is improved significantly. The interior joint of specially shaped column reinforced by polypropylene fiber has a better damage characteristic and energy dissipation while that by steel fiber shows a higher yield load and bearing capacity.
551
Authors: Fu Lai Qu, Shun Bo Zhao, Shi Min Zhang
Abstract: In order to study the seismic behavior of specially shaped reinforced concrete (RC) columns, thirteen specimens were tested under low amplitude cyclic load. The variables studied in this program included limb length, axial load ratio, angle of horzontal load and stirrup ratio. Through the test, the load-displacement relationships of the specially shaped RC columns were obtained. By considering the length of plastic hinge, a numerical analysis method based on fiber model was adopted for estimating the nonlinear behavior of specially shaped RC columns, and a computer program was developed to simulate the load-displacement skeleton curves of these columns. Finally, the calculated results were compared with experimental data, and they agreed well with each other. The method was convenient for predicting the nonlinear behavior of specially shaped RC columns in earthquake.
1167
Authors: Jian Tang, Lang Wu
Abstract: According to the code and technical regulation, a irregular RC frame with specially shaped columns have been designed, which situated at the area of fortification intensity 7. Subsequently, the nonlinear dynamic analysis has been carried out for the structure by inputting ground motions in two directions. After summing up the calculation results, this paper have examined seismic performance of the structure under the rare seismic actions and given a primary evaluation on the structure to see if it achieves the predetermined seismic aims. It indicates that the structure designed the codes can achieve the predetermined seismic aims under the rare earthquake.
1712
Authors: Jian Tang, Ping Wen Mao
Abstract: According to the code and technical regulation, a regular RC frame with specially shaped columns have been designed, which situated at the area of fortification intensity 7(0.15g). Subsequently, the nonlinear dynamic analysis has been carried out for the structure by inputting ground motions in one direction. After summing up the calculation results, this paper have examined seismic performance of the structure under the rare seismic actions and given a primary evaluation on the structure to see if it achieves the predetermined seismic aims. It indicates that the structure designed the codes can achieve the predetermined seismic aims under the rare earthquake.
5152
Authors: Li Li, Ke Jian Ma, Hua Gang Zhang, Ya Qin Lu
Abstract: The feature of the concrete grid-frame structure with specially shaped columns is the frame beams and specially shaped columns in the walls were divided by rib beams and rib columns, then the rib beams, the rib columns, the frame beams and the specially shaped columns together constitute the grid-frame structures with specially shaped columns. The rib beams and the rib columns can share parts of the vertical and horizontal loads which the structure should bear and work together with the frame beams and the specially shaped columns, so make the lateral stiffness of the structure is increased and the ultimate strength, ductility and seismic performance of the structure are improved. Moreover, Phosphorus gypsum will be poured to enclose concrete beams and columns and become the filler wall among them. At the same time, phosphorus gypsum wallboards are used as the middle filler walls to separated rooms flexibly. By doing so, the building is more energy saving. In addition, the phosphorus gypsum which is a type of industrial waste can be consumed and become useful material in construction.
987
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