Study on seismic performance of prefabricated shear walls using non-contact lapping with steel fiber reinforced sulphoaluminate concrete connection

The study designed a prefabricated shear wall using non-contact lapping with steel fiber reinforced sulphoaluminate concrete connection, which had many advantages, such as early highstrength, convenient assembly, short construction period, low precision requirement and compact concrete. To investigate the seismic performance of prefabricated reinforced concrete shear wall (PRCSW), pseudo-static tests were conducted on the three PRCSWs with three lapping length of non-contact lapping steel bars (i.e. 100, 200, 300 mm) and one cast-in-place reinforced concrete shear wall (CRCSW). The results showed that the three PRCSWs did not occur the severe crushing of concrete. The crack distribution height of PRCSW could reach the similar height to the CRCSW as the lapping length increased to 300 mm. The shape of hysteresis loops presented antiSshape, which illustrated the PRCSWs occurred obvious slip deformation. In comparison with the CRCSW, the peak loads of the PRCSWs with lapping lengths of 100, 200, and 300 mm decreased 22.9%, 13.0% and 11.0%, while the corresponding displacements decreased 30.5%, 19.5%, and 12.4%. As the lapping length ranged in 100 mm-300 mm, the ductility factors of PRCSWs were larger than 3.2, which met the requirement of Chinese code GB50011-2010. The ductility factors of PRCSWs with lapping lengths of 100 and 200 mm decreased by 3.4% and 10.8% compared with CRCSW, but it increased by 10.6% for PRCSW with lapping length of 300 mm. The cumulative energy dissipation of PRCSW with lapping length of 300 mm was 50.9% higher than that of CRCSW. But it decreased by 22.6% and 12.2% for PRCSWs with lapping length of 100 mm and 200 mm. Thus, it could be summarized the bearing capacity, deformation capacity and energy dissipation of PRCSW could be improved by increasing the lapping length. Meanwhile, the PRCSWs could obtain acceptable seismic performance as the lapping length increased to 300 mm. The calculation method on the load bearing capacity was proposed, which had high accuracy by comparison the calculated and tested results of peak loads of PRCSWs.