Effect of Cast-in-Place Beams on Seismic Performance of Precast Shear Walls

Zhang W. Lee D. Lee W.-J. Kim M.-S. Park J.-Y.
January 2023 American Concrete Institute

ACI Structural Journal
2023 #120 Issue 1 89 - 102 pp.

There is a drastic change in design and construction trends of underground structures, where a precast concrete (PC) shear wall system is quickly replacing a cast-in-place (CIP) diaphragm wall (that is, 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 that in horizontal connection between PC walls and foundations to satisfy the seismic design criteria specified in codes. To this end, this study introduces cast-in-place (CIP) cap beam and waling beam at the top and midheight of PC walls to connect individual precast wall panels by means of a coupling action. Precast specimens were carefully designed to be code-compliant as intermediate precast shear wall systems, and 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. Copyright

cast-in-place (CIP) beam , precast , seismic performance , shear wall , underground

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The Department of Architectural Engineering, Chungbuk National University, Cheongju, South Korea
Nazarbayev University, Astana, Kazakhstan
The University of Illinois at Urbana-Champaign, Urbana, IL, United States
The Research and Development Institute, Lotte Construction Co., South Korea

The Department of Architectural Engineering
Nazarbayev University
The University of Illinois at Urbana-Champaign
The Research and Development Institute

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