Abstract
To help designers develop solutions to overcome the cracking problem in steel-plate-reinforced concrete composite shear walls due to the concrete shrinkage, the influence of steel plates and studs on the shrinkage behavior of high-performance concrete (HPC), including restrained shrinkage strain, shrinkage strain gradient, and cracking potential, were theoretically and experimentally investigated in this study. A model for theoretical analysis was used to research the shrinkage performance of concrete that was restrained by steel plates and studs. The major parameters involved in the experiments include the thickness and material elastic modulus of the steel plate, in addition to the diameter, height, and number of studs. It was found that the shrinkage of HPC decreases and its potential cracking increases with the increase of thickness and elastic modulus of the steel plate, and the diameter, height, and number of studs. The restraining effect of the steel plate and stud on the HPC shrinkage decreases with the distance of their respective locations. It demonstrates that the HPC near a steel plate and stud is prone to crack compared with that far away from the steel plate and stud. This potential could be reduced by uniformly restraining the HPC.
Highlights
The volume of concrete can decrease, even in the absence of external load, with the reduction in the internal humidity of concrete caused by hydration and drying effects
The concrete used in the SPRW is restrained by reinforcement and a combination of steel plate and studs, rather than only reinforcement as in traditional reinforced concrete shear walls
The results indicate that the restraining effect of the steel plate on the high-performance concrete (HPC)
Summary
The volume of concrete can decrease, even in the absence of external load, with the reduction in the internal humidity of concrete caused by hydration and drying effects. Such reduction in the concrete volume is called shrinkage. Steel-plate-reinforced concrete composite shear walls (SPRW) have been widely used for super high-rise buildings, such as PINGAN International Finance Centre (592.5 m) and Shanghai Tower (632 m) in China, because of their good structural performance [2]. Compared to the conventional reinforced concrete shear wall, SPRW consist of high-performance concrete (HPC), embedded steel plates, and densely distributed studs. The concrete used in the SPRW is restrained by reinforcement and a combination of steel plate and studs, rather than only reinforcement as in traditional reinforced concrete shear walls
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