Seismic Performance of Tuned Liquid Column Dampers for Structural Control Using Real-Time Hybrid Simulation

2016 ◽  
Vol 20 (8) ◽  
pp. 1370-1390 ◽  
Author(s):  
Fei Zhu ◽  
Jin-Ting Wang ◽  
Feng Jin ◽  
Li-Qiao Lu
Keyword(s):  
Real Time ◽  
Seismic Performance ◽  
Structural Control ◽  
Hybrid Simulation ◽  
Liquid Column ◽  
Liquid Column Dampers

Real-time hybrid simulation of full-scale tuned liquid column dampers to control multi-order modal responses of structures

2017 ◽  
Vol 138 ◽  
pp. 74-90 ◽  
Author(s):  
Fei Zhu ◽  
Jin-Ting Wang ◽  
Feng Jin ◽  
Li-Qiao Lu
Keyword(s):  
Real Time ◽  
Hybrid Simulation ◽  
Full Scale ◽  
Liquid Column ◽  
Liquid Column Dampers

scholarly journals Mathematical modeling and optimization scheme for omnidirectional tuned liquid column dampers

2021 ◽  
Author(s):  
Behnam Mehrkian ◽  
Okyay Altay
Keyword(s):  
Mathematical Modeling ◽  
Structural Control ◽  
Equation Of Motion ◽  
Liquid Column ◽  
Shaking Table ◽  
Optimization Approach ◽  
Optimization Scheme ◽  
Structure System ◽  
Modeling And Optimization ◽  
Liquid Column Dampers

As a well-known and reliable control device, tuned liquid column dampers (TLCDs) have been investigated numerically and experimentally and implemented in a number of structures over the last three decades. However, TLCDs basically suffer from the lack of multidirectionality, which is the critical need for real structures, in particular under random vibrations such as wind and earthquake excitations. This aspect has garnered the attention of the structural control community to modify this promising damper to achieve more efficiency and to extend its application range to multidirectional vibrations. This paper proposes a mathematical modeling and optimization approach for omnidirectional tuned liquid column dampers (O-TLCDs). As an improved and reformed TLCD, O-TLCDs are formed by circularly distributed of n ≥ 3 L-arms about a common joint point at the center, through which all L-arms are connected to each other. Thanks to this layout, O-TLCDs can control structures with full counteracting force capacity in all transversal directions regardless of the excitation angle of incidence. This paper, in the first step, proposes the governing equation of motion of O-TLCDs, for which Lagrange’s principle is employed, and the equation of motion of the coupled O-TLCD-structure system. In doing so, a formal solution to determine the degree of freedom (DoF) of the O-TLCD is introduced, which proves independence of the O-TLCD response from the number of L-arms as well as from the angle of excitations. Second, for designing O-TLCDs, a set of design criteria and a general optimization scheme, which accommodate the online simulation of coupled O-TLCD-structure system under arbitrary excitations, are proposed. Consequently, without adding extra complication coming from extra DoFs to the motion equation of the damper, the O-TLCD functions as an enhanced liquid damper for multidirectional vibration attenuation. Next, using the O-TLCDs designed with different mass ratios, numerical simulations of O-TLCD-structure systems are conducted under seismic loads, free vibration, harmonic excitation and white noise and the controlled and uncontrolled responses of the systems are assessed in the time and the frequency domain. Here, the role of important parameters such as the mass ratio, the head loss coefficient, the liquid deflection and the excitation amplitude are evaluated and the influence of varying conditions on the efficiency of the O-TLCD are discussed. Results demonstrate that the proposed O-TLCD can be well tuned to the structure and markedly control the peak and the RMS of responses of the structure. In the end, an experimental study on a prototype O-TLCD is performed using a shaking table, which verifies the proposed mathematical modeling approach.

Seismic Performance of Storage Tank Isolated by Different Isolators Through Real-Time Hybrid Simulation

2021 ◽  
pp. 2150190
Author(s):  
Zhenyun Tang ◽  
Yue Hong ◽  
Liusheng He ◽  
Zhenbao Li
Keyword(s):  
Real Time ◽  
Seismic Performance ◽  
Storage Tank ◽  
Shear Force ◽  
Experimental Testing ◽  
Reduction Rate ◽  
Hybrid Simulation ◽  
Seismic Energy ◽  
Overturning Moment ◽  
Friction Pendulum

There are three kinds of isolators commonly used in storage tank, friction pendulum bearing (FPB), laminated rubber bearing (LRB), and variable curvature friction pendulum bearing (VCFPB), respectively. Real-time hybrid simulation is conducted in this paper to compare the seismic performance of the storage tank isolated by the above three types of bearings. The storage tank is used as the physical substructure for experimental testing, and the isolators are adopted as the numerical substructure for numerical simulation. The isolation performance is estimated by the following perspectives: deformation of the isolator, shear force, overturning moment, and input energy. Test results show that the deformation of LRB is the largest, which can be twice that of FPB, and that larger deformation will enlarge the seismic energy input into the storage tank. Moreover, the low-frequency components of shear force and overturning moment are amplified by LRB. In contrast, the FPB and VCFPB have a good performance on all frequency bands. Particularly, the softening mechanism enables VCFPB to have better seismic performance and have a reduction rate of about twice that of LRB.

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