预应力FRP片材加固混凝土墩柱的研究进展

Research Progress on Concrete Columns Strengthened with Lateral Pre-Stressed FRP Sheets

预应力FRP片材加固混凝土墩柱施工工艺简便,既可用于震后应急加固,也适于永久性抗震加固。这种新型加固方法能够避免FRP片材的应变滞后,充分发挥FRP片材的高强特性;促使原有混凝土裂缝的弥合,限制裂缝的发生和开展,提高柱的耐久性能;重新调整混凝土墩柱的受力状态,显著提高被加固混凝土墩柱的延性、承载力和抗震性能。基于预应力FRP片材加固混凝土墩柱的国内外研究现状,围绕预应力FRP片材加固混凝土墩柱的起源、FRP片材预应力施加方法、预应力FRP片材锚夹具、预应力FRP片材加固混凝土柱的抗震性能等几个方面的最新研究进展进行了综述,对目前FRP片材加固混凝土墩柱研究中亟需解决的问题进行了分析与展望。

The concrete column strengthening technology with pre-stressed FRP sheet is very simple and convenient ,which can be used as emergency and permanent strengthening of damaged concrete column in earthquake. By using this new strengthening technology, strain hysteresis of FRP sheets can be avoided; strength of FRP can be fully used; crack generation and expansion of concrete can be confined; durability, ductility ,bearing capacity and seismic behavior of concrete columns can be improved significantly. Based on the state of the art in the world, the new progress of the technology of columns strengthened with pre-stressed FRP sheets was presented, including studies in terms of the origin of the new technology, pre-stress applying system, the anchors used for pre-stressing FRP sheets and the seismic behavior of concrete columns strengthened with pre-stressed FRP sheets. Then, the key problems in its practical application were analyzed.