配断热桥连接件悬挑阳台板力学性能研究

Research on mechanical properties of cantilever balcony plates with thermal bridge connectors

阳台作为围护体系当中的重要组成部分,提高阳台的保温隔热水平是降低建筑能耗、实现节能减排目标的重要措施之一。本文在已有试验数据基础上,利用Abaqus有限元软件建模的方式,建立了14个新型的配断热桥连接件悬挑阳台板有限元模型,研究不同参数下新型悬挑阳台板在静力加载作用下的破坏形态、极限承载力以及变形能力等性能,并在已有试验结果的基础上验证模型的适用性。研究结果表明,通过减小保温材料宽度、增加连接件半径、增大灌浆混凝土块受压面积均可以提高新型悬挑阳台板的极限承载力。其中改变连接件半径对新型悬挑阳台板极限承载力的影响最大,改变灌浆混凝土块受压面积对新型阳台板极限承载力的影响最小。最后,对配两种不同类型断热桥连接件的新型悬挑阳台板进行正常使用极限状态验算以及设计极限承载力计算,并将结果与有限元模拟值进行对比。结果表明,新型配断热桥连接件悬挑阳台板不仅满足悬挑构件达到限值挠度时的承载力要求且极限承载力高于设计极限承载力,其安全性能较高。

The balcony is an important part of the building envelope.Improving the thermal insulation level of the balcony is one of the important measures to reduce building energy consumption and achieve energy saving and emission reduction.In this paper,using Abaqus finite element software modeling method,14 new finite element models of concrete balcony slabs with thermal bridge connectors are established,and the failure form,ultimate bearing capacity and deformation capacity and other properties of the new balcony slabs under static loading under different parameters are studied,and the applicability of the model is verified on the basis of the existing test results.The research results show that the ultimate bearing capacity of the new balcony slab can be improved by reducing the thickness of the thermal insulation layer,increasing the radius of the connecting piece,and increasing the compression area of the concrete block.Among them,changing the radius of the connector has the greatest impact on the ultimate bearing capacity of the new balcony slab,and changing the compression area of grouting concrete block has the least impact on the ultimate bearing capacity of the new balcony slab.Finally,the limit state of normal use and the calculation of the design ultimate bearing capacity of the new cantilevered balcony slab with two different types of thermal bridge connectors are compared,and the results are compared with the finite element simulation values.The results show that the cantilevered balcony slab of the new type of thermal bridge connector not only meets the bearing capacity requirements when the cantilevered member reaches the limit deflection,but also the ultimate bearing capacity is higher than the design ultimate bearing capacity,and its safety performance is high.