Study on Influence of Grouting Construction Defects on Sleeve Connection Performance at Low Negative Temperature
The structural connection form of prefabricated concrete shear wall is mainly grouting sleeve connection,and the performance of the grouting sleeve connection has a great impact on the mechanical properties of shear wall.In the construction process,sleeve is prone to have the grouting defects,especially in the low temperature environment,its construction defects are more likely to occur.Pull-out tests were carried out on 15 semi-grouting sleeves constructed in low negative temperature environment.The failure mode,load-displacement curve,bearing capacity,deformation capacity and bond strength of each specimen were studied with different defects in the middle of grouting material as test variables.The influence of different defects on the mechanical properties of semi-grouting sleeves was analyzed,and the performance of semi-grouting sleeve joints was evaluated.A finite element model considering the grouting defects was established,and the simulation results conformed well with the test results.
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