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根据古砖塔竖向开裂的震害特征,提出了预应力碳纤维板围箍加固工艺,研制了相应的张拉锚固装置。通过六边形古砖塔缩尺模型的围箍加固试验,研究了碳纤维板、砌体在围箍力作用下的应变随时间的变化规律。研究结果表明:张拉碳纤维板可对塔身产生有效的环向约束,碳纤维板的张拉应变和砌体的压应变与预应力度基本成正比;采用超张拉工艺可以降低碳纤维板与砌体之间摩擦阻力的影响,改善应变分布的不均匀状况;在长期保持预应力的状态下,碳纤维板和砌体的应变在14 d后趋于稳定,变化趋势符合对数分布规律。
According to the seismic damage characteristics of vertical cracking of ancient brick tower, the reinforcement technology of prestressed carbon fiber reinforced plastic enclosure hoop is proposed and the corresponding tension and anchorage device is developed. Through the hoop reinforcement test of the hexagonal ancient brick tower scale model, the variation of strain of carbon fiber reinforced polymer (CFRP) and masonry under the action of the hoop force with time was studied. The results show that: Tension carbon fiber plate can produce effective annular restraint on the tower, the tensile strain of carbon fiber reinforced plastic and the masonry compressive strain and prestressing force is basically proportional; using super-tensioning process can reduce the carbon fiber board and puzzle And the frictional resistance between the body and the body to improve the uneven distribution of strain. Under long-term prestressing, the strain of CFRP and masonry tended to be stable after 14 d, and the trend of change accorded with the law of logarithmic distribution.