Abstract
This paper investigates the effect of considering soil‐structure interaction (SSI) in seismic responses of reinforced concrete (RC) chimneys installed by distributed tuned vibration absorbers vertically (d‐MTVAs). A multimode control approach is used to design the d‐MTVAs. Two‐dimensional (2D) RC chimney is the assembly of beam elements. Frequency‐independent constants for the springs and dashpots are used for modeling the raft and the surrounding soil. The equations of motion for nonclassically damped systems are derived and solved using Newmark’s method. The effectiveness of the d‐MTVAs is weighed against the case of single tuned vibration absorber (STVA), d‐MTVAs suppressing the first modal responses (d‐MTVAs‐1), and randomly distributed MTVAs (ad‐MTVAs). Additionally, parametric studies are conducted for varying mass and damping ratios in the STVA, d‐MTVAs‐1, ad‐MTVAs, and d‐MTVAs. In order to show the efficiency in the STVA, d‐MTVAs‐1, ad‐MTVAs, and d‐MTVAs cases, responses (displacement and acceleration) at top of the RC chimney while subjected to different real earthquake excitations are computed. It is concluded that the STVA, d‐MTVAs‐1, ad‐MTVAs, and d‐MTVAs are effective in response mitigation of the RC chimney; however, d‐MTVAs are more efficient while considering equal total mass of the TVA(s). Moreover, the soil type significantly influenced the design parameters of the STVA/d‐MTVAs‐1/ad‐MTVAs/d‐MTVAs and seismic response of the RC chimney.
Highlights
Industries generally used reinforced concrete (RC) chimneys with varied geometries
The structure will be supported on very deep foundation if the rock is too deep or it will be supported on a combination of mat foundation and deep foundation or it will be supported on rock-socketed piles or drilled shafts. e researchers believe that if the chimney is modeled with these foundations, the behavior of such foundations will be mobilized because of dynamic loads; i.e., there will not be much soil-structure interaction (SSI) under dynamic loads
No study is conducted on earthquake response control of the chimney wherein placement and tuning of the d-multiple TVAs (MTVAs) are made in accordance with the chimney including SSI. e objective of the present study is to study the efficient positioning and tuning of the Distributed multiple tuned vibration absorbers (d-MTVAs) based on the modal properties of the fixed-base uncontrolled chimney
Summary
Industries generally used reinforced concrete (RC) chimneys with varied geometries. Earthquake forces caused damages or collapses to several chimneys. No study is conducted on earthquake response control of the chimney wherein placement and tuning of the d-MTVAs are made in accordance with the chimney including SSI. E first three modal responses of the chimney are controlled by installation of STVA, d-MTVAs, ad-MTVAs, and d-MTVAs. e mass participation factors for the first mode, for the second mode, and for the third mode are 0.615, 0.190, and 0.100, respectively. E eigen vectors of the natural frequencies of the fixed-base uncontrolled chimney are estimated to do the placement of the d-MTVAs. chimney and tuned to the fundamental frequency of the chimney. E eigen vectors of the natural frequencies of the fixed-base uncontrolled chimney are estimated to do the placement of the d-MTVAs In this procedure, the d-MTVAs controlling only fundamental modal responses are attached. It should be mentioned that there is only one TVA placed at a node. e subsequent TVAs are placed as per the criteria of the amplitude of larger to large in a particular mode
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