Next, the pre-stressing process is initiated, which involves two main methods: pre-tensioning and post-tensioning. In pre-tensioning, the rebars are initially tensioned by being fixed to an anchorage point or a sturdy frame. The opposite end of the rebars is then pulled using hydraulic jacks ...
The pre- stressing system used is of two methods called pre- tensioning & post-tensioning. The pre- stressing by pre & post tensioning device mechanism, developed by Anchoring system in concrete structural element is adopted for structures.In modern method of Pre stressing electricity with Low ...
Should post-tensioning be desired, the tendons 27 are initially suspended loosely and covered with a hydrophobic bond breaker to prevent bonding. The tendons 27 in the post-tensioning process must not bond with the cement, as they do in pre-tensioning. In the preferred method a concrete slurry...
7.Batch Prestress Loss of Concrete Pipe Pile by Post-Tensioning Method后张预应力混凝土管桩分批张拉预应力损失 8.A Study on Prestressing Loss of Anchorage Circle Caused by Anchorage Retraction锚具夹片回缩引起预应力损失的研究 9.Force Analysis of Web Plate and Research on Prestressing Loss of the Prestre...
External post-tensioning is defined as a system in which the pre-stressing tendons or bars are located outside the concrete section. The pre-stressing forc... AF Naser,Z Wang - 《Journal of Engineering & Applied Sciences》 被引量: 10发表: 2010年 STUDY ON THE DEGRADATION OF HARD ROCK WIT...
The prestressing can be developed by either post-tensioning a series of strands(or tendons) that are placed inside the core, or by using expansive core materials which do expand upon curing and will therefore impose an active pressure on the confining tube. The bond can be developed by either...
Jacks for professional tensioning steel hinge lines of prestressed reinforcement forHydraulic Stressing Jack, tensioning operation in all kinds of steel strand anchorage. It generally needs to be matched with the tension of the high-pressure oil pump, tension and power back to the top by...
12h. The applied clamping pressure was calculated according to [37], where the pre-tensioning force on each bolt was determined from the formula Fp=Mt/(kφ). Here, Mt (200 Nm) is the initial torque applied to each nut, k is the friction coefficient between nut and frame, and φ is ...
Determination of optimum post-tensioning cable forces of cable-stayed bridges Modern cable-stayed bridges can be economically designed by applying optimum post-tensioning cable forces to achieve a minimum deflection and a uniform ben... MM Hassan,AO Nassef,AAE Damatty - 《Engineering Structures》 被...
The self-prestressing properties of the iron-based shape memory alloy (Fe-SMA) enable it to strengthen the concrete structure without on-site mechanical tensioning, which is convenient and fast, and have attracted numerous studies [19–33]. Hong et al [34–37] evaluated the application of Fe...