Seismic Response of a Secondary System Mounted on a Torsionally Coupled Non-Linear Primary System

Agrawal, Abhijit K.; Datta, T. K.

doi:10.1080/13632469809350326

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…Let K pi (i = 1, 4) represents the initial lateral stiffness of the i-th resisting element, then the total initial stiffness of the primary system in both X and Y directions is given by (1) and stiffness of the equipment system in any direction is given by K s . Let R i denotes the distance of the i-th resisting element from the center of mass (CM) of the primary system then the total initial torsional stiffness of the primary system, defined about the CM, is given by…”

Section: System Modelmentioning

confidence: 99%

“…Clearly, there is a lack of studies on the subject especially exploring the parametric behavior of equipment system mounted over torsionally coupled yielding primary system under bi-directional ground excitation. Recently, Agrawal and Datta [1] studied the behavior of a secondary system mounted on a torsionally coupled and linear primary system under uni-directional random ground excitation. They [2,3] also studied the behavior of a secondary system mounted on a torsionally coupled yielding primary system under uni-directional random ground excitation, using both frequency and time domain methods of analysis.…”

Section: Introductionmentioning

confidence: 99%

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Non‐Linear Response of Light Equipment System in a Torsional Building to Bi‐Directional Ground Excitation

Agrawal

1999

Shock and Vibration

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Dynamic response of a light equipment item attached to a non-linear and torsionally coupled main system is evaluated under bi-directional earthquake excitation. To account for the effect of translations and torsion, each story of the building is modelled as three degrees-of-freedom (DOFs), with two DOFs for translation in two orthogonal directions and third DOF for torsion. The responses (relative displacement between the equipment system and the floor of the primary system on which the equipment system is mounted and absolute acceleration of the equipment system itself), are determined under random ground motion in two orthogonal directions, which is idealized as a stationary random process represented by a white noise excitation. The responses are obtained by time domain simulation procedure. The response behavior of the light equipment is examined under a set of parametric variations. These parameters include the uncoupled lateral frequency of the primary and the equipment systems, the ratio of uncoupled lateral to rotational frequencies of the primary system, eccentricity ratios of the primary and the equipment systems in X and Y directions, damping ratio of the primary and the equipment systems and the mass ratio of the two systems. Results of the study indicate that under some parametric conditions the responses of the equipment system are significantly affected by torsional coupling and non-linearity of the primary system. It is also observed that the responses of the equipment system can be alleviated by increasing the damping ratio of the equipment system.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non‐Linear Response of Light Equipment System in a Torsional Building to Bi‐Directional Ground Excitation

Agrawal

1999

Shock and Vibration

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“…They studied the response of a secondary element mounted over inelastic one-storey primary system (Psystem) with torsional effect and subjected to base motion in one direction. Their model was 2-D model with the eccentricity of the P-system in one direction [8]. They also studied the dynamic response of a secondary element mounted on a torsionally inelastic P-system under base motions in two directions.…”

Section: Introductionmentioning

confidence: 99%

“…Analytical research studies were carried out by Agrawal and Datta [8][9][10]. They studied the response of a secondary element mounted over inelastic one-storey primary system (Psystem) with torsional effect and subjected to base motion in one direction.…”

Section: Introductionmentioning

confidence: 99%

“…They also studied the dynamic response of a secondary element mounted on a torsionally inelastic P-system under base motions in two directions. Sets of coupled inelastic differential equations were used to evaluate the hysteretic force deformation behaviour of the inelastic P-system [9,10]. Dynamic responses of acceleration-sensitive NSCs mounted on a multi-storey RC building with torsional effect were studied using a finite element (FE) approach by the present authors [11].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Torsion on the Behaviour of Non-Structural Components Mounted on Irregular Reinforced Concrete Multi-Storey Buildings

Aldeka¹,

Chan²,

Dirar³

2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper considers the seismic responses of acceleration-sensitive non-structural components (NSCs stories, i.e., 5, 7, 10, 13, and 15-storeys . The P-structures were designed by the authors according to the full seismic provisions of Eurocode 8 (EC8). Distributed inelastic fibre elements are adopted to model the beams and columns of the Pstructures. To simulate NSCs in P-structures, vertical cantilever beams fixed at their bases with masses on top are modelled with variety of lengths to adjust their natural frequencies to the natural frequencies of the P-structures. Full dynamic interaction is considered between the NSCs and P-structures during the analyses. A comparison is made between the numerical results and the EC8 formulation, and a general conclusion is drawn that the provisions of EC8 for design of NSCs are un-conservative in some cases. 3875A. Aldeka, AHC. Chan and S. Dirar

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Seismic response of the secondary piping system under bi-directional earthquake

2021

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Seismic Response of a Secondary System Mounted on a Torsionally Coupled Non-Linear Primary System

Cited by 8 publications

References 16 publications

Non‐Linear Response of Light Equipment System in a Torsional Building to Bi‐Directional Ground Excitation

Non‐Linear Response of Light Equipment System in a Torsional Building to Bi‐Directional Ground Excitation

Effects of Torsion on the Behaviour of Non-Structural Components Mounted on Irregular Reinforced Concrete Multi-Storey Buildings

Seismic response of the secondary piping system under bi-directional earthquake

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