Constructability of Post-Tensioning Anchors in Shear Walls

摘要

Muchos edificios de post-tensado y garajes de estacionamiento están construidos con tendones de un solo hilo no unidos. Cuando las hebras terminan cerca o pasan a través de un muro estructural (muro cortante), la capacidad de construcción se ve afectada. Refuerzo congestionado en muros estructurales, especialmente en edificios construidos en regiones sísmicas, impiden la colocación de anclajes y refuerzos asociados. Además, la colocación del anclaje dentro de los muros puede hacer que sea imposible utilizar formas de escalada para construir muros antes de los pisos.%Many post-tensioned buildings and parking garages are constructed with unbonded single-strand tendons. These tendons typically comprise seven-wire, 0.5 in. (12.7 mm) diameter, Grade 270 [1860]) strands that are greased and sheathed in polymer extrusions and are fitted with encapsulated anchorages. Tendon layout typically consists of concentrated tendons in one direction (banded tendons) and distributed tendons in the other direction (distributed tendons). Tendons are usually anchored at the centroid of the slab thickness using dead-end and stressing-end (live-end) anchors. While the locations of the anchors within the floor area may not be critical to constructability. setting and stressing anchors will affect constructability when the strands terminate near or pass through a structural wall (shear wall). The congested reinforcement in structural walls, especially in buildings constructed in seismic regions, makes the determination of anchor location especially important to constructability.