Experimental Investigation of Pounding Responses in Longer Structures at Expansion Gap.

Autor: Hubballi, Siddalingappa S., Jangid, R. S.
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Zdroj: Journal of Vibration Engineering & Technologies; Feb2024, Vol. 12 Issue 2, p1707-1723, 17p
Abstrakt: Purpose: Extensive expansion joint damage has been seen after earthquakes, prompting many researchers to study the structural pounding phenomena experimentally and analytically for longer buildings. Since the expansion gap has limitations, the adjacent structures have to be designed so that no pounding or sustainably less impact of pounding should occur during an earthquake. Method: Four sets of experiments were conducted for surface-to-surface interaction between structural elements made of steel and mitigation (by introducing rubber pads in the gap) materials when subjected to El-Centro earthquake excitations: (i) the first sets of experiments focus on the direct pounding (DP) and mitigated pounding (MP) of two flexible models with minor differences in natural frequency; (ii) second sets of experiments concentrate on two stiffer adjacent models; (iii) the third sets of experiments focuses on two adjacent models with different frequencies and (iv) the fourth set focuses on the responses of two adjacent models with equal floor mass but different natural frequencies. Results: The experimental responses of DP and MP in longer structures at the expansion gap for different combinations of adjacent frames are compared for justification of better combinations. The higher magnitude and regular pounding responses are observed in different natural frequency combinations of adjacent frame experiments. The adverse effect due to the mitigation material in the gap is also observed in responses of different frequency combinations. Conclusion: This experimental study illustrates that the nearer frequency combinations are far safer compared to different frequency combinations concerning the DP and MP effect. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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