含外挂墙板装配式混凝土框架抗震及热工性能

Seismic and thermal performance of precast concrete frame with precast facade panel

摘要:

为研究预制外挂墙板与主体结构点支承连接的结构和热工性能,本文开展了含点支承外挂墙板的框架结构受力性能试验和三维传热计算分析。结果表明:试验模型实现了“强柱弱梁、强节点弱构件”的破坏模式,极限层间位移角约为1/30,连接节点未发生破坏,构件连接构造可保证装配式框架结构的整体抗震性能；外挂墙板连接螺栓是否拧紧对主体框架弹性阶段的抗侧刚度影响差别不大,螺栓干挂连接和U形连接筋湿挂连接对主体框架达到弹塑性位移角限值前的抗震性能影响差别不大；引入U形钢板阻尼器后外挂墙板在大侧移下的刚体转动减少16%~30%,且对主体框架的破坏模式、承载能力和变形能力影响不显著,可采用U形钢板阻尼器控制大尺寸外挂墙板的地震位移响应,实现墙板间接缝宽度与密封胶施工便利性、位移能力的合理匹配；外挂墙板内、外叶间的混凝土是连接节点区域形成热桥的根本原因,导致外挂墙板热工性能削弱62.1%,设置隔热垫后热桥影响降低86.6%,可实现连接节点区域附近的热桥消解。

Abstract:

To investigate the structural and thermal performance of the connection between point-supporting facade panels and the main structure, quasi-static tests and heat transfer calculation were conducted. The results indicate that test models achieve the failure mode characterized by “strong column-weak beam” and “strong joint-weak component” behavior, with ultimate drift ratios of approximately 1/30. The connection joints remain undamaged. The connection details of precast components could ensure the overall seismic performance of the precast frame structure. Whether the connection bolts of the precast facade panel are tightened or not had little impact on the elastic lateral stiffness of the main frame. Similarly, the differences between bolted connections and wet connections with U-shaped rebars are minimal in terms of their influence on the seismic performance of the main frame before the elastic-plastic drift ratio limit. Under large lateral drift, the U-shaped steel plate damper can reduce the rigid-body rotation of the precast facade panel by 16% to 30%, while having no significant impact on the failure mode, load-bearing capacity, and deformation capacity of the main frame. Therefore, U-shaped steel plate dampers can be employed to control the seismic displacement response of large-scale external wall panels, achieving a reasonable balance between joint width, sealant application convenience, and displacement capacity. The concrete between the inner and outer wythes is the root cause of thermal bridge in the connection area, resulting in a 62.1% reduction in the thermal performance of the facade panels. The heat insulated pads could markedly reduce the thermal bridge effect in the connection by 86.6%, thereby achieving thermal bridge mitigation near the connection.