Abstract
The research objective of this study was the seismic performance of double-row reinforced ceramsite concrete sandwich wall panels. The feasibility of upgrading a new wall panel from a non-load-bearing partition wall to a load-bearing seismic wall was examined by conducting cyclic load tests on five wall panel specimens. The test piece was a sandwich thermal insulation structure that could achieve a good protection distance between the thermal insulation material and the fire source so that the fire prevention problem could be solved. At the same time, the problem of easy fall-off of the insulation system was also solved. The specimens were divided into three groups, including three double-row reinforced ceramsite concrete sandwich wall panels with different dosages of alkali-resistant glass fiber, a double-row reinforced ordinary concrete sandwich wall panel, and a solid concrete ceramic wallboard. The effects of different dosages of alkali-resistant glass fiber, construction forms, and bearing side plate materials on the seismic performance of the sandwich wall panels were investigated separately for the specimens. From the analysis of the specimen results (damage characteristics, hysteresis curves, energy dissipation capacity, bearing capacity, ductility, longitudinal reinforcement strain, and stiffness degradation), it could be seen that among the five types of wallboard, the double-row reinforced ceramsite concrete sandwich wall panel with 0.3% fiber content had the best ductility and energy dissipation capacity. Adding fiber could solve or improve the problem of the low ultimate bearing capacity of ceramsite concrete as the wallboard’s bearing material. Compared with the same size solid ordinary concrete wallboard, the bearing capacity of the double-row reinforced ceramic concrete sandwich panel was slightly reduced. However, the additional seismic performance indexes were relatively superior. Through the analysis of the test results, it was shown that, when considering the thermal performance and seismic capacity, the new wall panel had good prospects for engineering applications.
Highlights
The material type or structural form of conventional wallboard is the fundamental factor used to determine its thermal insulation, heat insulation, and seismic performance.depending on the survey data, the heat transfer of the exterior wallboard accounts for about 30–45% of the total heat consumption of a building [1,2]
The results showed that increasing the strength of ceramsite concrete could give full play to the material properties of the tensile steel wire, and it could markedly increase the load-bearing limit load of the wall panel
In the research on ceramsite concrete sandwich wall panels, most of the panels are used as infill partition walls, and the use of ceramsite concrete as a load-bearing structural layer for load-bearing wallboards in seismic structures has not been discussed in depth [19,20,21,22,23,24]
Summary
The material type or structural form of conventional wallboard is the fundamental factor used to determine its thermal insulation, heat insulation, and seismic performance. In the research on ceramsite concrete sandwich wall panels, most of the panels are used as infill partition walls, and the use of ceramsite concrete as a load-bearing structural layer for load-bearing wallboards in seismic structures has not been discussed in depth [19,20,21,22,23,24]. In this case, this study had the aim of proposing double-row reinforced ceramsite concrete with a core composite wall panel. 6C14 indicates six HRB400 rebars with a diameter of 14 mm; 8C12 indicates eight HRB400 rebars with a diameter of 12 mm; 4C20 indicates four HRB400 rebars with a diameter of 20 mm
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