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| Analysis of seismic and vibration characteristics of tall and large concrete tower structures |
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Received:November 11, 2024
Revised:February 14, 2025
Accepted:February 21, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.01.018 |
| KeyWord:high large concrete well tower;hoisting hall floor;vibration characteristics;excitation force;Midas/Gen |
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| BGRIMM Technology Group, Beijing 100160, China |
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| Abstract: |
| Well tower structure is an important ground tower industrial building in the mine industrial site, and it is an important channel to realize material transportation, personnel lifting and mineral lifting.Relatively few studies have been conducted on the seismic performance, dynamic characteristics, and the effects of equipment excitation forces of high-rise concrete shaft towers with a height exceeding 60 meters above ground.This paper employs YJK software to carry out 3D modeling by the existing main well tower of a copper mine project, computes the seismic response of the structure under the earthquake actions of 6 degree, 7 degree and 8 degree under the current seismic standard, and analyzes the seismic weakness of the tall well tower structure. By using the finite element software MIDAS/GEN, the vibration characteristics of the elevator hall are analyzed, and the vibration law of the single excitation structure of the motor beam is further investigated. The results indicate that the seismic weakness of tall and large concrete tower structures is prominent due to the high aspect ratio, high floor opening rate and uneven load distribution. Special attention should be paid to controlling the interstory shear and interstory displacement angle in the design process. In the design, considering the conditions such as equipment installation, maintenance, floor loading, etc., the floor and main beam stiffness of the lifting floor hall is large, and the natural vibration frequency of the lifting equipment is low, merely 5.33 Hz, which is far less than the natural vibration frequency of the functional floor. The natural vibration frequency of the motor is 9.78 Hz, which passes through the second and third modes of the lifting hall floor. Due to the small excitation force, the maximum vibration stress caused is 0.143 N·mm?2, the maximum deformation value is 0.011 6 mm, and the maximum deformation speed is 1.015 mm·s?1, which are not sufficient to cause the vibration of the support beam and thus are not enough to cause the vibration of the functional layer of the lifting hall. Therefore, ensuring that the floor slab and main beam of the lifting hall have sufficient rigidity will not cause vibration in the functional layer of the lifting hall under this lifting system. |
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