预制夹芯保温墙体FRP连接件抗拔性能试验研究

预制夹芯保温墙体是集承载与保温一体化的新型预制保温墙体。该墙体由内外叶钢筋混凝土板、中间保温层及纤维增强塑料(FRP)连接件组成,其中FRP连接件是连接内外叶钢筋混凝土板的关键部件,其受力性能直接影响墙体的安全性。本文以上海市某安居工程为背景,基于拔出试验对FRP连接件的抗拔承载力、破坏形态、荷载-滑移关系及荷载-应变关系等进行了较为系统的研究。研究表明,试件均发生了混凝土劈裂破坏;试件的抗拔承载力为23.5kN,为抗拔荷载设计值的14.3倍,满足工程设计要求,并具有较大的安全储备。最后,提出了预制保温墙体FRP连接件的抗拔承载力计算方法。

PULL-OUT TESTS FOR EVALUATIONS OF ANTI-PULLING BEHAVIOR OF FRP CONNECTORS IN PRECAST SANDWICH INSULATION WALL PANELS

Precast sandwich insulation wall panel is a new type of insulation wall which performs well both in structural bearing and thermal insulation.This kind of wall is consisted of internal and external concrete wythes,insulating layers and the key component-FRP connectors,which ties two concrete wythes together to provide a distributed fastening system.Taking the model from a practical project in Shanghai as a reference,a series of tests including three pull-out specimens,with emphasis on FRP connectors’ pull-out capacity,failure pattern and load-slip curve etc.,were presented.All the tests were terminated by the concrete fracture,and the average pull-out capacity of the connectors was 23.5kN,about 14.3 times of the design pull-out load.This means the connector could meet the requirements of the design in the practical project,and has a great safety margin as well.In addition,the calculation method to compute the pull-out capacity of FRP connectors in precast concrete sandwich wall is proposed.