Design Requirements For The Performance Of Prestressed Anchors
Release time:
2021-06-08
Pre-stress is to improve the structural performance. The compressive stress applied to the structure in advance during the construction period.
Pre-stress is to improve the structural performance. The compressive stress applied to the structure in advance during the construction period. The pre-compression stress during the structural operation can fully or partially offset the tensile stress caused by the load to avoid damage to the structure. It is often applied to concrete structures. This is the pre-applied pressure on the concrete structure before it is subjected to load, so that the internal force of the concrete in the tension zone will produce compressive stress when the external load acts, which is used to reduce the tensile stress generated by the external load. It is relatively late for the prestressed anchorage structure to not crack or split under normal use. The independently anchored clip-type prestressed anchor is designed according to the actual calculated bearing capacity of the ultimate strength of the steel strand. At present, the ultimate yield strength of the steel strand is close to the standard value, and the elongation of the steel strand is difficult to determine , Causing the steel strand to be easily cut at the cut of the clip.
Under normal circumstances, the strength of the steel strand, the surface hardness, and the design hardness of the clip are tested with corresponding scales according to the hardness. The actual combination and matching are the best. If the hardness of the clip does not meet the design requirements, there is a difference in hardness between the two. The diameter of the inner hole of the clip of the prestressed anchor, the taper angle of the clip and the taper angle of the inner hole in the anchor ring are all designed according to the nominal diameter of the steel strand. If it can meet the design requirements, after the pre-stressed anchorage parts are assembled, the internal magic angle between the assembled parts will reach a balanced state during the pre-stressing process, thereby producing a good self-anchoring ability. If the diameter of the steel strand exceeds the allowable deviation too much, the balance will be disrupted. At present, most of the steel strands are exceeding the standard, which obviously affects the anchoring performance of the clip-type prestressed anchors.
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