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发布时间:2020-01-06 00:00:00
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水泥混凝土制品

双向预应力装配式地铁车站通道结构及其力学性能分析
双向预应力装配式地铁车站通道结构及其力学性能分析
  • 许满吉1,2,赵海川1,3,肖志强1,3,王小彪1,王 俊4,方 涛4,朱张峰4,*,管东芝5
2023年第8期
摘要
引用本文
摘   要:基于实际工程,设计了一种新型双向预应力装配式地铁车站通道(装配式通道)结构,其预制节段端部采用企口形式,纵、横向均通过预应力筋后张法进行连接。通过有限元软件对比分析了装配式通道与现浇结构的应力及变形性能,并在此基础上深化设计了企口纵向长度、纵向预应力筋张拉应力和截面积、预制节段串接数量,确定了装配式通道的结构优化方案,并通过有限元分析验证了其力学性能。结果表明,优化后具有更高强度和刚度。 Abstract: Based on the actual project, a new structure of two-way prestressed prefabricated metro station passageway (prefabricated passageway)was designed, the end section of the prefabricated segment was tongue-and-groove, and the longitudinal and transverse directions were connected by the post-tensioning of the prestressed tendons. Through the finite element analysis, the concrete stress and structural deformation were compared with the cast-in-place structure. Further deepen design was carried out on the longitudinal length of the nozzle, the tensile stress and cross-sectional area of the longitudinal prestressing tendons, and the number of prefabricated passageway segments in series. The optimization scheme of the prefabricated passageway was determined, and its mechanical properties were verified. The results show that the optimized structure has higher strength and stiffness.
许满吉,赵海川,肖志强,等.双向预应力装配式地铁车站通道结构及其力学性能分析[J].混凝土与水泥制品,2023(8):37-41,59. XU M J,ZHAO H C,XIAO Z Q,et al.Structure and its mechanical performance analysis of two-way prestressed prefabricated metro station passageway[J].China Concrete and Cement Products,2023(8):37-41,59.
BFRP布加固损伤钢筋混凝土短梁的抗弯性能研究
BFRP布加固损伤钢筋混凝土短梁的抗弯性能研究
  • 张军伟1,王廷彦2,3,吴玉祥3
2023年第8期
摘要
引用本文
摘   要:通过对3根试件进行抗弯性能试验,研究了普通RC短梁、BFRP布加固未损伤及损伤钢筋混凝土短梁的破坏形态、材料应变、受弯承载力等变化规律。结果表明:BFRP布加固未损伤及损伤RC短梁的极限破坏模式一致,均为BFRP布先被拉断,受压区混凝土未被压碎;与普通RC短梁一致,加固后的试件跨中截面混凝土应变均近似符合平截面假定;BFRP布加固损伤RC短梁的荷载-挠度曲线不存在开裂阶段,且加固后,损伤RC短梁的极限承载力比未损伤RC短梁和普通RC短梁的极限承载力稍高;BFRP布加固未损伤RC短梁可提高试件刚度,降低试件延性;BFRP布加固损伤RC短梁也可提高试件刚度,但不会降低试件延性。 Abstract: Based on the bending performance tests of three RC short beams, the failure morphology, material strain, flexural bearing capacity, etc. of ordinary RC short beams and BFRP cloth reinforced undamaged and damaged RC short beams were studied. The results show that the ultimate failure modes of undamaged and damaged RC short beams strengthened with BFRP cloth are consistent, with BFRP cloth being pulled first and the concrete in the compression zone not being crushed. The strain of the mid span concrete of both undamaged and damaged reinforced concrete short beams strengthened with BFRP cloth is approximately consistent with the assumption of a flat section as the ordinary RC short beams. The load-deflection curve of BFRP cloth reinforced damaged RC short beams lackes cracking stage. The ultimate bearing capacity of damaged RC short beams is slightly higher than that of reinforced undamaged RC short beams and the ordinary reinforced concrete short beams. After the undamaged short beam is reinforced with BFRP cloth, the stiffness of the specimen can  be increased and the ductility of the specimen can  be reduced. After the damaged short beam is reinforced with BFRP cloth, its stiffness can also be increased, but the ductility of can not be reduced.
张军伟,王廷彦,吴玉祥.BFRP布加固损伤钢筋混凝土短梁的抗弯性能研究[J].混凝土与水泥制品,2023(8):42-47. ZHANG J W,WANG T Y,WU Y X.Experimental study on flexural behavior of damaged reinforced concrete short beams strengthened with BFRP cloth[J].China Concrete and Cement Products,2023(8):42-47.
CFRP布加固再生混凝土柱复合受扭性能试验研究
CFRP布加固再生混凝土柱复合受扭性能试验研究
  • 朱开济,邵永健*,谢 强
2023年第8期
摘要
引用本文
摘   要:为研究CFRP加固再生混凝土柱的复合受扭性能,以再生混凝土强度、CFRP粘贴方式和箍筋间距为研究参数,设计并制作了4根CFRP加固再生混凝土柱,通过压弯剪扭复合受力状态下的单调加载试验,研究其破坏形态、扭矩-扭率曲线特征、延性系数,并进行了损伤演变分析。结果表明:在达到极限承载力后,CFRP布被拉断、混凝土压溃,试件破坏;采用纵贴+横贴粘贴方式加固可以更显著提升试件的复合受扭性能;提高再生混凝土强度等级可较大幅度提升试件的极限扭矩;减小箍筋间距可提高开裂扭矩和极限扭矩;粘贴方式为纵贴+横贴试件的扭转延性系数相比仅纵贴试件大幅提高;提高再生混凝土强度等级和减小箍筋间距可有效减小损伤程度,CFRP粘贴方式为纵贴+横贴的试件比仅纵贴试件的损伤程度更小。 Abstract: In order to study the composite torsional performance of recycled concrete columns strengthened by CFRP, four columns were designed and manufactured using the strength of recycled concrete, the bonding mode of CFRP and the space between stirrups as parameters. The monotone loading tests under the combined stress state of flexural, shear and torsion were carried out to study the failure modes, torque-torsion curve characteristics and ductility coefficient. The damage evolution was analyzed. The results show that when the ultimate bearing capacity is reached, the CFRP is broken, the concrete is crushed and the specimen is destroyed. The composite torsional properties of the specimens can be improved significantly by using vertical and transverse pasting. The ultimate torque of specimens can be greatly improved by increasing the strength grade of recycled concrete. Cracking torque and ultimate torque can be increased by decreasing stirrup spacing. The torsional ductility coefficient of the longitudinal pasted and transverse pasted specimens is significantly higher than that of the longitudinal pasted specimens only. Increasing the strength grade of recycled concrete and reducing the space between stirrup can effectively reduce the damage degree. The damage degree of the specimens pasted longitudinal and transverse is smaller than that of the specimens pasted longitudinal.
朱开济,邵永健,谢强.CFRP布加固再生混凝土柱复合受扭性能试验研究[J].混凝土与水泥制品,2023(8):48-53. ZHU K J,SHAO Y J,XIE Q.Experimental study on composite torsional performance of CFRP reinforced recycled concrete columns[J].China Concrete and Cement Products,2023(8):48-53.
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