摘要
预制双钢板组合剪力墙抗侧力性能表征良好,但由于内部高热导率组件繁多造成不均匀传热,易形成局部低温区域引发结露霉变.基于预制双钢板组合剪力墙围护结构的热力学性能优化,提出一类围护结构构造设计原型,利用COMSOL Multiphysics建立有限元计算模型,结合参数化方法,探究双钢板剪力墙的保温设计参数、结构组件参数对其墙体内部的热流分布影响规律.研究结果表明:保温锚栓形成的点状热桥远大于对拉螺栓,双层钢板塞焊连接处则未出现明显温度波动,相邻构造层中不同连接件应保持一定间距,使热流尽可能通过完整保温层,避免形成连续热桥.相较于无热桥时的理想模型,含连接件时实际模型单位面积的壁面法向总热通量显著增益;改用低热导率保温材料能够明显减少主体法向热通量,但对点状热桥的抑制作用有限,热通量减小梯度随材料热导率减小而增大,保温材料宜将防火性能佳、经济成本低的岩棉或热导率低的EPS作为技术经济性优选;增大板厚能够有效抑制点状热桥处法向热通量,且该作用随板厚增大而减小;连接件在能够达到结构要求时建议优先增大布置间距、减小锚固深度以改善内部温度分布,其次考虑改用低热导率的玻璃钢制连接件改善局部热流,最后在锚固末端加覆保温砂浆或隔热垫块有效削弱热桥的影响.研究得到了法向热通量分布关于保温设计、结构组件中热工相关参数的变化规律,以指导双钢板剪力墙结构体系的围护结构热工设计.
Lateral force resistance of prefabricated double steel plate composite(DSPC)shear walls has been well characterized.However,local low-temperature areas can form easily,leading to condensation and mold due to numerous internal high thermal conductivity components and causing an uneven heat transfer.To address this issue,a class of enclosure prototypes was proposed based on the optimization of the thermal properties of a prefabricated DSPC shear wall enclosure.A finite element model was established using COMSOL Multiphysics combined with a parametric sweep to investigate the effects of thermal insulation and structural connectors on heat flux patterns in DSPC shear walls.The results demonstrated the following:the cold spots generated by insulation anchor bolts are considerably larger than those induced by tie bolts,and no significant temperature fluctuation exists at the plugwelded connection of the double steel plates;the connectors penetrating multiple structural layers must be spaced properly to prevent heat flux release without insulation.Compared with the ideal model neglecting thermal bridging,the total normal heat flux per unit area of the actual bridging is always greater.Employing insulation materials with low thermal conductivity reduces heat flux through the main section considerably;however,a limited inhibition effect is observed at cold spots.As the thermal conductivity of the insulation drops,the gradient of heat flux reduction rises,and utilizing fireproof rock wool or insulated EPS is recommended as an optimal choice in terms of technical economy.The normal heat flux can be effectively suppressed by thickening the insulation layer;however,this effect weakens as the insulation thickness increases.Based on the eligible structural properties,priority must be given to widening the spacing of the structural connectors while reducing the anchorage depth for a uniform internal temperature and then switching to well-insulated FRP connectors,and finally,adding an insulation mortar or bedding at the anchorage end to reduce the impact of thermal bridging.This study can guide the thermal design of prefabricated DSPC shear wall structural systems by providing the variation patterns of normal heat flux regarding thermaldependent parameters in the insulation layer and structural members.
作者
郭娟利
金勇运
李美玲
姜子信
周婷
Guo Juanli;Jin Yongyun;Li Meiling;Jiang Zixin;Zhou Ting(School of Architecture,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Architectural Physics and Environmental Technology,Tianjin University,Tianjin 300072,China;School of Future Technology,Tianjin University,Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2023年第6期641-648,共8页
Journal of Tianjin University：Science and Technology
基金
国家重点研发计划资助项目(2019YFD1101004).
关键词
剪力墙
热性能
有限元法
热绝缘
结构组件
shear wall
thermal property
finite element method
thermal insulation
structural member
