新型钢-混凝土夹芯模块墙体系围护结构关键节点热工分析

Thermal Analysis of Key Joints in Building Envelope of New Steel-Concrete Sandwich Module Wall System

近年来,在政府的推行与支持下,装配式建筑得到了长足的发展。并且随着绿色建筑以及“双碳”目标的提出,装配式建筑节能问题成为了研究的热点,尤其是围护结构的热桥问题。故针对新型钢-混凝土夹芯组合模块墙装配式建筑体系中的热工关键节点利用有限元分析的方法,对其性能进行了分析计算,并以达到“被动房”标准为目的进行设计。结果表明,当墙体使用250 mm石墨聚苯板作保温层时,H型钢梁、外墙与楼板连接节点以及拉结件等关键部位处均可满足“被动房”的无热桥要求;在此基础上,对T型连接节点以及L型连接节点进一步计算,发现分别使用80 mm厚的聚氨酯及50 mm厚的聚氨酯作保温即可满足“被动房”对结构性热桥传热系数的规定。这为此类新型装配式体系在建筑节能方向的发展提供了数据支持。

In recent years,with the implementation and support of the government,prefabricated buildings have been greatly developed.With the proposal of green buildings and double carbon targets,the energy saving problem has become a research hotspot,especially the thermal bridge problem of the building envelope.Thus,the finite element analysis method is used to analyze and calculate the thermal characteristic of the key nodes in the new steel-concrete sandwich composite modular wall assembly building system,and the design is carried out to meet the"passive house"standard.The results show that when the wall uses 250 mm graphite polystyrene board as insulation layer,the key parts such as H-shaped steel beam,exterior wall and floor connection node and tie member can meet the requirement of"passive house"without thermal bridge.On this basis,the T-type connection node and the L-type connection node are further calculated.It is found that the use of 80 mm thick polyurethane and 50 mm thick polyurethane as insulation can meet the requirements of the"passive house"for the structural thermal bridge heat transfer coefficient.This will provide data support for the development of this new type of assembly system in the direction of building energy saving.