Simplified Method for Considering Dynamic Second-Order Effects of Elastic SDOF System under Earthquakes

The structures subjected to large displacement under ground motion may be severely influenced by the structural second-order effects. This paper studied the dynamic second-order effects of the single-degree-of-freedom (SDOF) system under earthquake ground motions. The following achievements have been made: (1) the stiffness reduction coefficients considering and effects under static and dynamic analysis were deduced; (2) through numerical analysis, the accuracy of the formulas was verified.

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Study on Dynamic Second-Order Effects of SDOF System under Vertical Earthquake Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.743.128 ◽

2013 ◽

Vol 743 ◽

pp. 128-131

Author(s):

Feng Xia Han ◽

Jiang Yu

Keyword(s):

Ground Motions ◽

Second Order ◽

Order Effects ◽

Earthquake Loading ◽

Structural Dynamic ◽

Single Degree Of Freedom ◽

Motion Equations ◽

Sdof System ◽

Second Order Effects ◽

Regular Patterns

The paper studied the dynamic second order effects response of the single-degree-of-freedom (SDOF) system under vertical earthquake ground motions. The following achievements have been made: (1) the motion equations under vertical earthquake loading with second-order effects were established; (2) through numerical analysis, the regular patterns of structural dynamic second-order effects subjected to vertical earthquake loading are uncertain.

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Material Nonlinearity Effects on Dynamic Second-Order Effects of Slender RC Columns under Seismic Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.2145 ◽

2013 ◽

Vol 353-356 ◽

pp. 2145-2148

Author(s):

Feng Xia Han ◽

Liu Qing ◽

Han Xia

Keyword(s):

Second Order ◽

Order Effects ◽

Seismic Load ◽

Rc Columns ◽

Stiffness Reduction ◽

Dynamic Analyses ◽

Reduction Coefficient ◽

Second Order Effects ◽

Nonlinear Dynamic Analyses ◽

Material Nonlinear

This study investigates the influence of material nonlinear in slender reinforced concrete (RC) columns dynamic second-order effects under seismic load. The stiffness reduction coefficient is adopted in this paper. To identify the significance of various effects in terms of the dynamic second-order effects of the slender RC columns, nonlinear dynamic analyses are conducted for different periods and stability coefficients of simulated models with rare occurrence earthquake. On the basis of the obtained numerical results, the influence of material nonlinear for dynamic second-order effects are reviewed.

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Effect of Vertical Ground Motions on Horizontal Response of Structures

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455403000902 ◽

2003 ◽

Vol 03 (02) ◽

pp. 227-265 ◽

Cited By ~ 4

Author(s):

N. N. Ambraseys ◽

J. Douglas

Keyword(s):

Ground Motions ◽

Near Field ◽

Strong Motion ◽

Single Degree Of Freedom ◽

Vertical Excitation ◽

Single Degree ◽

Earthquake Ground Motions ◽

The Standard Model ◽

Vertical Ground Motions ◽

Vertical Ground

Single-degree-of-freedom (SDOF) elastic models are commonly used for gaining an understanding of the response of structures to earthquake ground motions. The standard SDOF model used does not account for the effect of gravity or the combined effect of horizontal and vertical excitations on horizontal response. The purpose of this paper is to review previous work on this topic and to investigate a series of SDOF models that do incorporate these effects and to compare their response to the response of the standard model using 186 strong-motion records of near-field earthquake ground motions. It is found that for most realistic SDOF models and most earthquake ground motions the effect of vertical excitation on horizontal response is small.

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