Recently, Academician Xiao Xuwen and the Engineering Research Institute of the Eighth Bureau of China Construction jointly proposed a new fabricated structural system, the vertically distributed steel bar unconnected fabricated concrete shear wall system, which was applied in the B-11 block of the pilot project of rental housing in Wenzhuang District, Jinan.
Lead & nbsp;
Recently, Academician Xiao Xuwen and the Engineering Research Institute of the Eighth Bureau of China Construction jointly proposed a new fabricated structural system, the vertically distributed steel bar unconnected fabricated concrete shear wall system, which was applied in the B-11 plot of the pilot project of rental housing in Wenzhuang District, Jinan. The system cancels the complex process of sleeve grouting connection of traditional fabricated shear wall structure, and improves the quality of the project. In Block B-11
of Wenzhuang District Rental Housing Pilot Project, the vertical distribution reinforcement of
the system prefabricated wall is configured according to the structural requirements and disconnected at the floor. At the same time, the length and reinforcement of the cast-in-place edge components at both ends are properly increased to ensure the realization of the bearing capacity; The upper and lower precast wallboards are connected by extrusion grouting at the floor to ensure the overall performance of the shear wall structure system; for the wall with low shear-span ratio and high shear requirements, oblique reinforcement can be added to improve the ductility, shear resistance and energy dissipation capacity of the wall. After systematic theoretical research, current code research and finite element analysis, the research team of Academician
Xiao Xuwen put forward the design method of the system. The reliability of the structure is verified by the test: the seismic performance of the precast specimens under the same axial compression ratio is the same as that of the cast-in-place comparison specimens, and some indexes such as ductility and energy dissipation are slightly better than those of the cast-in-place comparison specimens.
The construction technology is simple and convenient
. There are 6 construction units in the south area of the second bid section of the project, all of which are fabricated shear wall structures. Among them, the prefabricated shear walls on the 1st to 18th floors of the 3 # building and the prefabricated shear walls on the 1st to 16th floors of the 4 # and 6 # buildings all adopt this technology. At present, the 3 # building has been constructed to the 7th floor and the 4 # building has been constructed to the 4th floor. In the application practice, the components of the technical system have no sleeve, the preparation work only needs to check the elevation and the base mortar, the traditional positioning dowel is not needed to be considered, the process is simple, and the grouting is not needed on site, so the construction efficiency is higher while the quality is ensured. After the technical system is applied to
improve the construction efficiency
, only the elevation and the horizontal positioning need to be controlled for hoisting and positioning, the hoisting speed is shortened by more than one time compared with the traditional grouting sleeve connection system, the utilization rate of the formwork is reduced by 50-60%, and the number of the grouting sleeves on each layer is reduced by more than 200. Because the shear wall does not need to be grouted, the construction time of each layer can be saved by one day; and there are no large number of grout holes at the bottom of the precast wall, which can reduce the acceptance time of 50%.
The successful application of the shear wall with vertically distributed steel bars without connection has laid a solid foundation for the subsequent popularization and application.
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