Evaluation of soil-structure interaction effects on the damping ratios of buildings subjected to earthquakes

Cruz, Cristian; Miranda, Eduardo

doi:10.1016/j.soildyn.2017.05.034

Cited by 49 publications

(20 citation statements)

References 35 publications

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“…For flexible moment‐frame buildings, such as the one considered in Section 6, the effect of soil‐structure interaction on lateral vibration is generally not too important, although damping in higher modes may increase somewhat . However, the much higher vertical stiffness of a building means that soil‐structure interaction can significantly affect its response under vertical ground motion.…”

Section: Other Related Topicsmentioning

confidence: 99%

“…For flexible moment-frame buildings, such as the one considered in Section 6, the effect of soil-structure interaction on lateral vibration is generally not too important, although damping in higher modes may increase somewhat. 40 However, the much higher vertical stiffness of a building means that soil-structure interaction can significantly affect its response under vertical ground motion. To demonstrate this effect, the analysis of Section 9.1 using vertical ground motion is repeated with soil-structure interaction included, neglecting structural details of the foundation and the effect of embedment.…”

Section: Soil-structure Interactionmentioning

confidence: 99%

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Performance of viscous damping in inelastic seismic analysis of moment‐frame buildings

Hall

2018

Earthq Engng Struct Dyn

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Summary This paper investigates the performance of viscous damping in the inelastic seismic analysis of moment‐frame buildings using a detailed model of a 20‐story steel structure. Damping schemes included are Rayleigh, condensed Rayleigh, Wilson‐Penzien, tangent Rayleigh, elastic velocity Rayleigh, and capped damping. Caughey damping is found not to be computationally viable. Differences among the damping schemes, as quantified by plastic hinge rotations and story drifts, become noticeable once these quantities reach the 3% level. In order of least to greatest hinge rotations and story drifts that occur under lateral response to horizontal ground motion, the damping schemes rank as Rayleigh (most damping action), condensed Rayleigh, Wilson‐Penzien, tangent Rayleigh and capped damping, which are about the same, and elastic velocity Rayleigh (least damping action). Performance of Rayleigh damping under vertical ground motion is discussed, including the effect of soil‐structure interaction. The propensity of Rayleigh damping to generate excessive damping forces and moments during inelastic seismic analysis is explained, and a parameter is introduced that can predict the potential magnitude of the effect. A review of some literature on amplified Rayleigh damping moments is also presented.

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Section: Other Related Topicsmentioning

confidence: 99%

Section: Soil-structure Interactionmentioning

confidence: 99%

Performance of viscous damping in inelastic seismic analysis of moment‐frame buildings

Hall

2018

Earthq Engng Struct Dyn

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“…Damping is one of critical factors affecting a structure's responses under dynamic excitations. In practical engineering structures, damped systems are commonly characterized non-proportional damping, such as the soil-structure system [1][2][3], the steel-concrete structures [4][5][6], and structures with supplemental dampers [7,8]. Even though the dynamic response of a non-proportionally damped system can be solved by the direct integration method, the mode superposition method is frequently used.…”

Section: Introductionmentioning

confidence: 99%

A Modal Perturbation Method for Eigenvalue Problem of Non-Proportionally Damped System

Pan

Chen

et al. 2020

Applied Sciences

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The non-proportionally damped system is very common in practical engineering structures. The dynamic equations for these systems, in which the damping matrices are coupled, are very time consuming to solve. In this paper, a modal perturbation method is proposed, which only requires the first few lower real mode shapes of a corresponding undamped system to obtain the complex mode shapes of non-proportionally damped system. In this method, an equivalent proportionally damped system is constructed by taking the real mode shapes of a corresponding undamped system and then transforming the characteristic equation of state space into a set of nonlinear algebraic equations by using the vibration modes of an equivalent proportionally damped system. Two numerical examples are used to illustrate the validity and accuracy of the proposed modal perturbation method. The numerical results show that: (1) with the increase of vibration modes of the corresponding undamped system, the eigenvalues and eigenvectors monotonically converge to exact solutions; (2) the accuracy of the proposed method is significantly higher than the first-order perturbation method and proportional damping method. The calculation time of the proposed method is shorter than the state space method; (3) the method is particularly suitable for finding a few individual orders of frequency and mode of a system with highly non-proportional damping.

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“…Liang et al (2018) used a 3D model of a single-degree-of-freedom oscillator on embedded hemispherical foundation to evaluate the effects of dynamic characteristics of the site on dynamic SSI. The effect of SSI on change of damping ratio of a structure subjected to earthquake was studied by Cruz and Miranda (2017). Bolisetti et al (2018) evaluated the effect of linear and nonlinear SSI analysis on safety of nuclear structures.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of outrigger–belt truss system considering soil–structure interaction

Tavakoli

Kamgar

Rahgozar

2019

Int J Adv Struct Eng

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The focus of this study is to investigate the seismic behavior of outrigger-braced building considering the soil-structure interaction based on finding the best location of outrigger and belt truss system. For this purpose, a central outrigger-braced frame of a steel tall building is considered. A layered soil deposit underlied this frame and the resulting soil-structure system is subjected to seismic excitation. To analyze this system, direct method is employed in OpenSees. Also, elastic and in-elastic analyses are both considered and a comparison is made between current results and the results related to the system with fixed base. The best location of outrigger-belt truss system is determined by considering the maximum roof displacement, base moment and base shear with and without soil-structure interaction. It is shown that considering SSI affects the location of outrigger-belt truss system. Elastic analysis of both systems, namely with fixed base and with soil-structure interaction, showed that locating the belt truss at higher stories caused lower amounts of roof displacement.

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Evaluation of soil-structure interaction effects on the damping ratios of buildings subjected to earthquakes

Cited by 49 publications

References 35 publications

Performance of viscous damping in inelastic seismic analysis of moment‐frame buildings

Performance of viscous damping in inelastic seismic analysis of moment‐frame buildings

A Modal Perturbation Method for Eigenvalue Problem of Non-Proportionally Damped System

Seismic performance of outrigger–belt truss system considering soil–structure interaction

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