Abstract
The different types of defects of half grouting sleeves will remarkably increase the risks of precast concrete structures. In order to better understand the defects of rebar connections between half grouting sleeves, six different test groups on insufficient grout height, insufficient compactness, rebar offset, insufficient rebar anchor length, overtime grouting, and control group had been researched. The uniaxial tension experiments were conducted for the 24 different specimens, and load‐slip curves were also analyzed. The results of the experiments showed that the outside of the rebar was snapped off as for the destruction mode, while the destruction mode changed as the increment of the degree of defect surpasses the critical value. The bearing capacity and deformability were dropped with the increase in the degree of defects, and a critical value of rebar anchoring length of sleeve was discovered. In the end, different finite‐element models were built based on different deficient situations, and load‐slip constitutive model was obtained, which would be helpful to evaluate the structural performance of precast concrete structures in construction.
Highlights
Precast concrete (PC) structure is widely adopted because of its notable advantages such as high quality, high industrialization level, high construction speed, low labor intensity, and green construction [1]
Qin et al [3] had compared the seismic resistance of monolithic precast concrete structure (MPCS) with cast-in-place structure (CIPS). e results show that, except for typical features, MPCS and CIPS generally have similar seismic responses and prove that they have better seismic performance without collapse under high-intensity seismic waves
Zhang et al [4] studied and predicted the service life of precast concrete structures in chloride environment. e analysis shows that the initial state of corrosion and use limit state are sensible of the chloride diffusion coefficient within connecting area, and a higher pitting factor has obvious influence on the bearing capacities of PC structures
Summary
Precast concrete (PC) structure is widely adopted because of its notable advantages such as high quality, high industrialization level, high construction speed, low labor intensity, and green construction [1]. [5] presented the calculation method of the bending resisted bearing capacity of precast grouted shear wall influenced by node displacements. The most important factor affecting the prefabricated structure is the connection of the half-grouted sleeve. E experiment results show that the ultimate bearing capacity of sleeve connection is related to the square root of the grouting strength. E following researches were mainly processed based on grouting sleeve connection; during the assembled building construction, conditions such as insufficient anchoring length, rebar position offset, and grouting defects caused by grout blocked, leaking, and temperature usually occurred. Erefore, 24 half-grouted sleeve connection joints were made in this experiment in order to stimulate the five defects including vertical insufficient grouting height, insufficient compactness, rebar offset, insufficient rebar anchor length, and overtime grouting that were produced in the practical construction process. Uniaxial tension experiment was made to analyze the influences on the defects above the connection performance of halfgrouted sleeve joints
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