Performance of Loop Connection in Precast Concrete Walls Subjected to Lateral Loads
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Industrialized building system (IBS) was presented to complete construction projects at the lowest cost and time. The connection of precast components in IBS structures plays a significant role to provide stability of buildings subjected to various loads. Hence, structural engineers have quite a lack knowledge on the proper connection and detailed joints of IBS structure, especially when subjected to dynamic/static loads such as earthquake, wind, vehicle, machinery and so forth. The loop connection considered as a conventional connection is the most interesting precast wall-to-wall connection in construction. However, this study presents a unique method for connecting two adjacent precast wall panels by using two steel U-shaped channels which are attached in the side of walls and tied together as male and female joints by using bolts and nuts make proper integrity of connection. A U-shaped rubber is implemented between the two channels in order to dissipate vibration effect in structure. The results of this study consist of the loading from the actuator, the displacement at the connection of the different LVDTs at different levels, and the crack pattern at the ultimate failure of the specimen. Upon collecting and analyzing the load test data from the data logger, the load versus displacement curves are plotted to study the actual behavior of the connection under axial, shear and flexural loads. Furthermore, the results of experimental tests showed that precast wall-to-wall equipped with U-shaped steel channel is capable of exceeding the capacity of precast walls subjected to lateral load, thereby improving its flexibility behavior in all directions. The average deformation of the proposed connection in all the LVDs was nearly 3 and 1.5 times greater than the loop connection. Additionally, the maximum average relative rotation deformation of the proposed connection in all LVDs is nearly 36% greater than the loop connection, which means that the U-shaped steel channel connection is more flexible.
KeywordsCapacity Industrial building system (IBS) Lateral load Precast concrete structure Precast wall connection.
This work received financial support from Housing Research Center of UPM and NAEIM Company and the supports are gratefully acknowledged.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest regarding this paper.
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