Title: Effect of Cast-in-Place Beams on Seismic Performance of Precast Shear Walls
Author(s): Wei Zhang, Deuckhang Lee, Won-Jun Lee, Min-Su Kim, Je-Young Park
Publication: Structural Journal
Appears on pages(s):
Keywords: precast; shear wall; seismic performance; CIP beam; underground
There is a drastic change in design and construction trends of underground structures, where precast concrete (PC) shear wall system is quickly replacing cast-in-place (CIP) diaphragm wall (i.e., the so-called slurry wall) system in urban areas for better constructability and reliable performances. However, it is challenging to achieve the proper coupling action or composite performance through vertical connections between adjacent PC walls and in the horizontal connection between PC walls and foundation to satisfy the seismic design criteria specified in codes. To this end, this study introduced a cast-in-place (CIP) cap beam and waling beam at the top and mid-height of PC walls to connect individual precast wall panels by means of a coupling action. Precast specimens were carefully designed to be code-compliance as an intermediate precast shear wall system, and those were then fabricated and tested under the reversed cyclic loads to evaluate seismic performances. Detailed numerical models were also developed to identify how CIP beams can effectively improve the seismic performance of a precast shear wall system by restraining the free rotation and axial deformation of individual precast wall panels.