|
Title |
Seismic Performance of High-rise Apartment with Wall Pier-Spandrel System
|
|
Authors |
노지은(Ji-Eun Roh) ; 안강우(Kang-Woo Ahn) ; 엄태성(Tae-Sung Eom) ; 조성우(Seong-Woo Jo) ; 박홍근(Hong-Gun Park) |
|
DOI |
https://doi.org/10.4334/JKCI.2023.35.3.305 |
|
Keywords |
벽보; 벽기둥; 연결보; 내력벽시스템; 고층아파트 wall spandrel; wall pier; coupling beam; bearing-wall system; high-rise apartment |
|
Abstract |
Wall spandrels, which are coupling beams used along the perimeter of each floor’s slab to connect adjacent walls in bearing-wall apartments, exhibit various aspect ratios and reinforcement details depending on their location, such as living rooms and kitchens. Wall spandrels are generally considered nonstructural elements and are designed through structural analysis with reduced stiffness. In this study, the seismic performance of a high-rise apartment with such wall spandrels was evaluated through nonlinear static/dynamic analysis. Fiber modeling was used for walls, and beam elements with moment hinges were used to model wall spandrels and coupling beams. The nonlinear modeling of wall spandrels followed the guidelines of ASCE 41-17. When the aspect ratio (i.e., length-to-depth ratio) was around 2.0, shear-controlled modeling parameters were used; otherwise, flexure-controlled parameters were used. Seismic evaluation results showed that wall spandrels experienced flexural yielding at a small interstory drift ratio of 0.01% and exceeded the deformation limit for collapse prevention at an interstory drift ratio of 0.4%. After that, the overall load-deformation behavior exhibited minor strength loss and regain in a stagnant manner. Vertical walls connected by large spandrels displayed a cantilever wall behavior, ultimately failing due to reinforcement fracture or concrete crushing caused by increased tensile or compressive axial loads. Based on these findings, design recommendations were proposed for high-rise bearing-wall apartments with large spandrels.
|