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- W624557625 abstract "To ensure serviceability of structures, an accurate survey of the loss of prestress can be required so that appropriate remedial solutions can be engineered. The exact state of stress can only be determined through direct measurements on the structure. The strain relief method has been proven to be the only method available to measure stresses in concrete. Its principle is simple: the strain field is relieved by slotting the material; the change of the strain in the relieved area is measured and the stress is calculated taking into account the elastic properties of the material and the geometry of the cut. However, in concrete, the modulus of elasticity varies with concrete mix, age, curing and environmental conditions. In order to eliminate the need to know the elastic properties of the concrete, a flat jack can be inserted into the slot and pressurized. As a result the initial strain field will be restored. The combination of the measured data on strain and pressure will give the value of the stress. Extensive research and testing have been conducted in order to achieve better performance and cost efficiency, resulting in several improvements of the original technique. The method can be used to estimate the stress profile in any reinforced concrete/prestressed concrete (PC) structure (bridge girder, pier, building column, slab, tunnel, arch, etc), the residual prestress in a PC structure, and the loss of prestress in PC structure. This paper presents the improved method and a case study involving a bridge in Japan. For the covering abstract see ITRD E122906." @default.
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- W624557625 date "2003-01-01" @default.
- W624557625 modified "2023-09-24" @default.
- W624557625 title "THE STRAIN RELIEF METHOD FOR MEASURING THE STRESS IN CONCRETE" @default.
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