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Steel and Composite Structures   Volume 22, Number 2, October10 2016, pages 449-472
Seismic behavior of composite walls with encased steel truss
Yun-tian Wu, Dao-yang Kang, Yi-ting Su and Yeong-bin Yang

Abstract     [Buy Article]
    This paper studies the seismic behavior of reinforced concrete (RC) walls with encased cold-formed and thin-walled (CFTW) steel truss, which can be used as an alternative to the conventional RC walls or steel reinforced concrete (SRC) composite walls for high-rise buildings in high seismic regions. Seven one-fourth scaled RC wall specimens with encased CFTW steel truss were designed, manufactured and tested to failure under reversed cyclic lateral load and constant axial load. The test parameters were the axial load ratio, configuration and volumetric steel ratio of encased web brace. The behaviors of the test specimens, including damage formation, failure mode, hysteretic curves, stiffness degradation, ductility and energy dissipation, were examined. Test results indicate that the encased web braces can effectively improve the ductility and energy dissipation capacity of RC walls. The steel angles are more suitable to be used as the web brace than the latticed batten plates in enhancing the ductility and energy dissipation. Higher axial load ratio is beneficial to lateral load capacity, but can result in reduced ductility and energy dissipation capacity. A volumetric ratio about 0.25% of encased web brace is believed cost-effective in ensuring satisfactory seismic performance of RC walls. The axial load ratio should not exceed the maximum level, about 0.20 for the nominal value or about 0.50 for the design value. Numerical analyses were performed to predict the backbone curves of the specimens and calculation formula from the Chinese Code for Design of Composite Structures was used to predict the maximum lateral load capacity. The comparison shows good agreement between the test and predicted results.
Key Words
    wall; seismic performance; axial load ratio; brace; high-rise building
(1) Yun-tian Wu:
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, China;
(2) Yun-tian Wu, Dao-yang Kang, Yi-ting Su, Yeong-bin Yang:
School of Civil Engineering, Chongqing University, Chongqing 400045, China.

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