共查询到16条相似文献,搜索用时 463 毫秒
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玻璃纤维增强塑料(GFRP)筋在混凝土梁中的抗弯性能研究 总被引:1,自引:0,他引:1
论文从以玻璃纤维增强塑料筋替代钢筋应用在海港工程等恶劣环境混凝土结构中,以解决钢筋锈蚀所引起的混凝土结构耐久性问题的思路着手。在对玻璃纤维筋材料基本物理力学性能研究的基础上,以钢筋为对比,进行了10mm的玻璃纤维筋混凝土构件的三点抗弯试验。结果表明:GFRP筋在抗拉性能方面远高于钢筋,但抗剪及抗压性能比钢筋差;GFRP筋混凝土梁的抗弯曲破坏能力高于钢筋混凝土梁,但同样荷载下,GFRP筋梁的挠度大于钢筋混凝土梁的挠度;最终破坏时钢筋混凝土梁只有纵向裂缝,而GFRP筋除了有纵向裂缝外,还有横向裂缝。 相似文献
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高桩梁板码头的横梁高度较大,受桩基间距控制,跨径相对较小,也即跨高比较小,严格来说属于规范限定的深受弯构件。但在实际工作中,比较普遍的情况是深受弯构件按照普通的受弯构件来进行近似配筋。以现行规范为基础,通过工程实例分析这两种配筋方式后认为:同等情况下,深受弯构件比普通受弯构件计算配筋量增加30%~35%,对于高桩梁板码头的横梁或其他类似的深受弯构件,如按普通受弯构件来进行配筋,结果偏不安全。分析结论对今后类似的深受弯构件的设计工作具有一定的借鉴作用。 相似文献
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《船舶与海洋工程学报》2020,(3)
Ice crossings have been used for several reasons. First, due to the active development of the Arctic shelf, supplies and minerals are provided and transferred on special transports on the surface of ice covers. Second, ice crossings across rivers are used to reduce the length of transport routes. Traditional methods of increasing the load bearing capacity of ice are ice freezing from above, ice freezing from below, and ice strengthening through a wooden copepod flooring. Practical experience shows that the physical and mechanical properties of ice covers are unreliable and changeable in time and strongly depend on various external factors.Therefore, ice covers should be strengthened through alternative methods. Thus, predicting the bearing capacity of ice crossings and exploring methods for their strengthening are important. In this study, we consider the results of experimental and numerical studies on the bearing and deformation capacity of ice beams upon destruction from pure bending. Under pure bending, ice breaks down in the ice crossing when transports move along it. Tests were carried out with a specified reinforcement scheme. The results of the model experiments were compared with numerical calculations in the ANSYS software package. Experiments on ice beams reinforced with various composite materials were also performed. Destruction of samples in all cases occurred as a result of the formation of extensive cracks in the ice caused by the bending moment in the middle of the beam span. Based on the experimental and numerical research results, the use of a surface reinforcement in ice with various materials can increase the bearing capacity from 65% to 99% for this reinforcement scheme. 相似文献
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Stress concentration factors (SCFs) in steel tubular T/Y-connections strengthened with fiber reinforced polymer (FRP) are investigated. In the first step, a finite element (FE) model was developed and verified using data of several available experimental tests and empirical formulas. After that, 134 FE models of T/Y-joints with and without FRP were created and analyzed under in-plane bending (IPB) load. In the FE models, the contact between the FRP layers and the members (chord, brace, and weld) was defined. Results showed that the increase of the FRP layer number leads to the notable decrease of the SCFs. Also, the SCFs of a T/Y-joint reinforced with FRP can be down to 40% of the SCF of the corresponding unreinforced joint. Finally, FE results were used to propose two parametric formulas for determining the SCFs in the T/Y-joints strengthened with FRP subjected to IPB load. The proposed formulas were checked according to the UK Department of Energy acceptance criteria. 相似文献