不同连接件预制带肋复合墙板热工性能分析

Thermal performance analysis of prefabricated ribbed composite wall panels with different connectors

由于混凝土肋以及混凝土封边区域的存在,预制带肋复合墙板不可避免地产生热桥效应,因此降低其影响、提升复合墙板热工性能成为了一个亟待解决的问题。文章采用有限元软件,建立了预制带肋复合墙板的稳态三维传热模型,以不同抗剪连接件材料及连接件形式、混凝土肋间距、材料热物性、保温层厚度、混凝土板厚度和封边面积为参数,分析了预制带肋复合墙板的热工性能。结果表明:肋间距为200 mm、墙板厚度为150 mm的斜腹板玻璃纤维增强塑料连接件复合墙板的传热系数比钢丝桁架复合墙板降低了25.11%,比传统平板三明治复合墙板降低了51.72%,热工性能明显提升且热工稳定性更好;混凝土封边使得封边热桥区域向墙板中心方向大幅延伸,更换导热系数更低的封边材料可以降低甚至消除封边热桥产生的不利影响。

Due to the existence of concrete ribs and concrete sealing edge area,the thermal bridge effect of prefabricated ribbed composite wall panels is inevitable.Therefore,reducing the impact of thermal bridge to improve the thermal performance of composite wall panels has become an urgent issue to be solved.In this paper,the steady-state three-dimensional heat transfer model of prefabricated ribbed composite wall panels is established by using finite element software.The thermal performance of prefabricated ribbed composite wall panels is analyzed with different shear connector materials and connector forms,concrete rib spacing,material thermophysical properties,insulation layer thickness,concrete slab thickness and sealing edge area as parameters.The results show that the heat transfer coefficient of the glass fiber reinforced plastics connector composite wall panels with the rib spacing 200 mm and the wall panels thickness of 150 mm is 25.11%lower than that of the steel wire truss composite wall panels,and 51.72%lower than the traditional flat sandwich composite wall panels.The thermal performance is significantly improved and the thermal stability is better.The concrete sealing edge makes the sealing-edge thermal bridge area extend greatly to the center of the wall panel.Changing the sealing-edge material with lower thermal conductivity can reduce or even eliminate the adverse effects of the sealing-edge thermal bridge.