Tests and numerical simulation for anti-progressive collapse of RC frame reinforced with steel braces

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (5) : 173-181.

WENG Yunhao1, LI Zhi2, DENG Xiaofang1, QIAN Kai1,2

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Abstract

To study the strengthening effects of steel bracing on progressive collapse resistance of RC frames, two planar RC beam-column sub-frames were tested in laboratory. One of the specimens is strengthened by steel braces. Pushdown loading method is used to study the effects on failure mode and load resisting capacity. Experimental results indicated that steel brace can upgrade the first peak load by 122 %. The decrement of load resisting capacity is due to fracture of the tensile braces. The out-of-plane buckling of the compressive brace become very severe in the beginning stage. Therefore, it only affects the initial stiffness of the specimen and little effects on load resisting capacity of the specimen. Then, Commercial finite element (FE) software LS-DYNA is utilized to further quantify the strengthening contribution from the tensile and compressive braces. The FE model confirmed the experimental results that the compressive brace made by angle steel will become severe buckling in the beginning stage and thus, it has little effect on the structural resistance and the load resistance mainly attributed into the tensile braces; Buckling-restrained brace could significantly increase the contribution of the compressive brace for load resistance; If concrete infilled square section replaces the L-shaped section, the load resisting capacity could increase by 42 %.

Key words

Steel braces / RC frame / Progressive collapse / Strengthen effect / Buckling-restrained brace

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WENG Yunhao1, LI Zhi2, DENG Xiaofang1, QIAN Kai1,2. Tests and numerical simulation for anti-progressive collapse of RC frame reinforced with steel braces[J]. Journal of Vibration and Shock, 2022, 41(5): 173-181

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