Comparison of seismic performance tests and optimization of the brace layout of a nuclear island steel platform braced frame

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 60-70.

DING Zhenkun1，HU Baolin2，TIAN Hua1，HU Wubiao2，MIN Yujun2，XU Shian2

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Abstract

Considering the “strong beam and weak column” architectural structure of nuclear island steel platform frame structure, in order to study the influence of different brace structures on its seismic performance improvement, mechanical properties tests of pseudo static loading were carried out respectively for Braced Moment Resisting Frames (BMRF) and Buckling-Restrained Braced Frames (BRBF) specimen, and the seismic performance of different steel frame specimens was studied and compared, including hysteresis curves, skeleton curves and equivalent damping ratio, strength and stiffness degradation, etc. The test results showed that BRBF is superior in mechanical performance, and its ultimate deformation capacity and energy dissipation capacity are 88.67% and 654.9% higher than those of BMRF. On this basis, numerical analysis was adopted to further study the effects of Buckling-Restrained Brace layout on the overall mechanical properties of nuclear island steel platform minor structure. The results of numerical analysis showed that among the three different bracing layouts, single inclined Buckling-Restrained Brace layout (SBRBF) can not only improve the seismic performance of the whole structure, but also improve the mechanical performance of the original frame structure.

Key words

nuclear island steel platform / seismic performance / pseudo static test / brace layout / contrastive analysis

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DING Zhenkun1，HU Baolin2，TIAN Hua1，HU Wubiao2，MIN Yujun2，XU Shian2. Comparison of seismic performance tests and optimization of the brace layout of a nuclear island steel platform braced frame[J]. Journal of Vibration and Shock, 2023, 42(22): 60-70

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