The effects of repeated earthquake ground motions on the non-linear response of SDOF systems

2002 ◽  
Vol 32 (2) ◽  
pp. 291-308 ◽  
Author(s):  
C. Amadio ◽  
M. Fragiacomo ◽  
S. Rajgelj
Keyword(s):  
Linear Response ◽  
Ground Motions ◽  
Earthquake Ground Motions ◽  
Non Linear ◽  
Repeated Earthquake

scholarly journals Non-Linear Response of Cable-Mass-Spring System in High-Rise Buildings under Stochastic Seismic Excitation

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6858
Author(s):  
Hanna Weber ◽  
Stefan Kaczmarczyk ◽  
Radosław Iwankiewicz
Keyword(s):  
Linear System ◽  
Ground Motions ◽  
Vertical Direction ◽  
Equivalent Linearization ◽  
Mass System ◽  
High Rise ◽  
Earthquake Ground Motions ◽  
Cantilever Structure ◽  
Non Linear ◽  
Non Linear System

In high-rise buildings earthquake ground motions induce bending deformation of the host structure. Large dynamic displacements at the top of the building can be observed which in turn lead to the excitation of the cables/ropes within lift installations. In this paper, the stochastic dynamics of a cable with a spring-damper and a mass system deployed in a tall cantilever structure under earthquake excitation is considered. The non-linear system is developed to describe lateral displacements of a vertical cable with a concentrated mass attached at its lower end. The system is moving slowly in the vertical direction. The horizontal displacements of the main mass are constrained by a spring-viscous damping element. The earthquake ground motions are modelled as a filtered Gaussian white noise stochastic process. The equivalent linearization technique is then used to replace the original non-linear system with a linear one with the coefficients determined by utilising the minimization of the mean-square error between both systems. Mean values, variances and covariances of particular random state variables have been obtained by using the numerical calculation. The received results were compared with the deterministic response of the system to the harmonic process and were verified against results obtained by Monte Carlo simulation.

C1 in Displacement Coefficient Method for Taiwan to Estimate Maximum Inelastic Displacement Demands of Existing Structures

2008 ◽  
Vol 24 (2) ◽  
pp. N1-N13 ◽  
Author(s):  
Y.-Y. Lin
Keyword(s):  
Linear Response ◽  
Ground Motions ◽  
Site Conditions ◽  
Existing Structures ◽  
Inelastic Displacement ◽  
Earthquake Ground Motions ◽  
Lateral Strength ◽  
Modification Factor ◽  
Coefficient Method

ABSTRACTThe coefficient C1 in the displacement coefficient method of FEMA-273/356 is the modification factor to relate the expected maximum displacements of elasto-plastic inelastic SDOF systems to displacements calculated for linear response. It permits the estimation of maximum inelastic displacements from maximum elastic displacements for structures with known lateral strength (usually, the existing structures). Recently, an improved C1 has been presented in FEMA-440 because it was shown that the C1 in FEMA-273/356 underestimates the maximum inelastic displacement demands of structures significantly. However, the improved C1 in FEMA-440 was derived from the earthquake ground motions recorded in California. In addition, it was mentioned in FEMA-440 that “caution should be used when extrapolating the results presented in the report for ground motions and site conditions that differ”. Because the characteristics of earthquakes occurred in Taiwan are different from those occurred in California, the coefficient for used in Taiwan needs to be modified. The objective of this paper is to propose appropriate C1 for use in Taiwan.

Flow velocity and light level drive non-linear response of seagrass Zostera noltei to ammonium enrichment

2016 ◽  
Vol 545 ◽  
pp. 109-121 ◽  
Author(s):  
B Villazán ◽  
FG Brun ◽  
V González‑Ortiz ◽  
F Moreno‑Marín ◽  
TJ Bouma ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Linear Response ◽  
Light Level ◽  
Zostera Noltei ◽  
Non Linear

Non-linear response of stomata in Pinus koraiensis to tree age and elevation

Trees ◽  
2012 ◽  
Vol 26 (4) ◽  
pp. 1389-1396 ◽  
Author(s):  
Yumei Zhou ◽  
Marcus Schaub ◽  
Lianxuan Shi ◽  
Zhongling Guo ◽  
Anan Fan ◽  
...  
Keyword(s):  
Linear Response ◽  
Tree Age ◽  
Pinus Koraiensis ◽  
Non Linear
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