Winkler model for dynamic response of composite caisson–piles foundations: Seismic response

2014 ◽  
Vol 66 ◽  
pp. 241-251 ◽  
Author(s):  
Rui Zhong ◽  
Maosong Huang
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Winkler Model

scholarly journals On Predicting the Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings

2018 ◽  
Author(s):  
Carmine Lima ◽  
Enzo Martinelli
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Parametric Analysis ◽  
Short Review ◽  
Structural Components ◽  
Main Structure ◽  
Current State ◽  
Critical Issues ◽  
Key Features ◽  
Two Degree Of Freedom

This paper is intended at highlighting the main mechanical parameters controlling the behavior of the so-called "acceleration-sensitive" Non-Structural Components (NSCs). In the first part a short review of the current state of knowledge and the critical issues related to the prediction of the seismic response of NSCs is reported. Then, the paper presents the results of a numerical parametric analysis intended to capture the key features of the dynamic response of a two-degree-of-freedom (2DOF) system which is supposed to be representative of both the main structure and the "non-structural" component (NSC). Particularly, it allows to simulate the coupled behaviour of both main structure and NSC and evaluating their response. The main parameters controlling the dynamic response of NSCs emerge from this study, which could pave the way towards formulating more mechanically consistent relationships for evaluating the maximum accelerations induced by seismic shakings on NSCs.

Seismic Response for a Reinforce Concrete Specimen Considering Corrosive Hazards

2015 ◽  
Vol 764-765 ◽  
pp. 1124-1128 ◽  
Author(s):  
Wei Ting Lin ◽  
Yuan Chieh Wu ◽  
An Cheng ◽  
Tzu Ying Lee
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Seismic Response ◽  
Corrosion Test ◽  
Natural Frequencies ◽  
Response Spectrum ◽  
Open Circuit ◽  
Reinforced Concrete Frame ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

This study is aim to evaluate the dynamic response variation of the scale-down reinforced concrete frame specimen under accelerated corrosion conditions. The specimens achieved the accelerated corrosion test by immersing in the accelerated corrosion test. Open circuit potential, corrosion rate, natural frequencies, displacements, accelerations and response spectral curves were tested and discussed. Test results presented that the corroded reinforced concrete specimens presented the changes in the dynamic response especially natural frequencies and response spectrum. This study provided further insight on the variation of seismic response behaviors in the deteriorated reinforced concrete structures and hoped to useful for structural assessments and appraisals applied to full-scale structures.

Seismic Response Analysis of Twin-Tower Building with Enlarged Base

2014 ◽  
Vol 912-914 ◽  
pp. 1534-1537
Author(s):  
Shao Bo Zhang ◽  
Ke Lun Wei ◽  
Bi Jian Xiao
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Boundary Conditions ◽  
Seismic Response ◽  
Time History ◽  
Response Analysis ◽  
Rigid Boundary ◽  
Finite Element Software ◽  
Elastic Boundary ◽  
Elastic Boundary Conditions

This paper adopts large finite element software ANSYS to establish finite element model of twin-tower building with enlarged base, uses dynamic time history analysis method for seismic response calculation, compare and analyze the calculation results of twin-tower building with enlarged base under elastic boundary conditions and rigid boundary conditions. The results showe that dynamic response for model under elastic boundary conditions is larger than dynamic response for model under rigid boundary conditions, and elastic boundary conditions is more close to the actual situation.

scholarly journals Shaking Table Tests for Seismic Response of Orthogonal Overlapped Tunnel under Horizontal Seismic Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Honggang Wu ◽  
Hao Lei ◽  
Tianwen Lai
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Seismic Wave ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Acceleration Response ◽  
Test Device ◽  
Deformation Stages ◽  
Superposition Effect

This paper presents the seismic dynamic response and spectrum characteristics of an orthogonal overlapped tunnel by shaking table tests. First, a prototype of the engineering and shaking table test device, which was used to design details of the experiment, was developed. Then, the sensors used in the test were selected, and the measurement points were arranged. Subsequently, the Wenchuan seismic wave with horizontal direction in different peak ground accelerations was inputted into the model, followed by a short analysis of the seismic response of the overlapped tunnel in the shaking table test as well as the distribution of the peak acceleration. Throughout the studies, the model exhibited obvious deformation stages during the seismic wave loading process, which can be divided into elastic, plastic, plastic enhancement, and failure stage. In particular, the time- and frequency-domain characteristics of the key parts of the tunnel were discussed in detail by using the continuous wavelet transform (CWT) based on the Morlet wavelet as the basis function. We found that the acceleration response was more intense within 25–60 s after the seismic wave was inputted. Furthermore, owing to “the superposition effect,” the seismic response at the crown of the under-crossing tunnel was stronger than that at the invert of the upper-span tunnel. The low and medium frequencies in the transformation of small scales (5–20) significantly affected the overlapped tunnel. These results elucidate the seismic dynamic response of the overlapped tunnel and provide guidance for the design of stabilizing structures for reinforcing tunnels against earthquakes.

Shaking Table Test of Underground Pipeline under Three Dimension Seismic Excitation – Numerical Simulation

2014 ◽  
Vol 919-921 ◽  
pp. 960-964 ◽  
Author(s):  
Xiao Fu ◽  
Jun Wei Bi ◽  
Zhi Jia Wang ◽  
Chang Wei Yang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Seismic Response ◽  
Shaking Table Test ◽  
Time History ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Underground Pipeline ◽  
Three Dimension ◽  
Seismic Structure

Based on the design of the large-scale shaking table test of an underground pipeline under three dimension seismic excitation, the dynamic response of the soil-structure is analyzed by using ANSYS. In the numerical simulation, Drucker-Prager constitutive model is adopted to simulate the soil, the interface between soil and pipeline are simulated with zero thickness contact elements, size effects of test box are diminished by defining viscoelastic boundary around soil, the acceleration time history curve of the original earthquake wave is compressed and processed according to using the model scale similarity and energy duration which is presented by Trifunac-Brady [1] , and then the characteristic of seismic response of the pipeline can be found. The results show that the top of pipeline is the seismic response intense regional, deformation displacements of the central areas at the bottom and top of pipeline are always larger than others, the entrance and exit are the weak positions of anti-seismic structure; moreover, the dynamic response and interactions of soil-pipeline in the model experiment can be more accurately simulated by the methods presented in the paper. Thus, it can be served as reference for the design and construction of subsurface structures.

Seismic Response of Underground Structure under Vertical Seismic Excitation

2014 ◽  
Vol 1020 ◽  
pp. 463-471
Author(s):  
Cheng Zhi Qi ◽  
Xu Liu ◽  
Guo Hua Li ◽  
Deng Pan ◽  
Jian Luo
Keyword(s):  
Dynamic Response ◽  
Rigid Body ◽  
Seismic Response ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Underground Structure ◽  
Bending Moment ◽  
Seismic Excitation ◽  
Mode Shapes ◽  
Interaction Dynamic

Seismic response of shallowly buried underground under vertical seismic excitation is studied. In order to simplify the analysis two steps are adopted in the analysis. In the first step structure is looked at as rigid body, and the dynamic response of the structure under vertical seismic excitation is obtained on the basis of soil-structure dynamic interaction analysis. In the second step at first the natural frequencies and mode shapes of the structure are obtained with consideration of the bending restraint of the side walls to roof slab, and then the dynamic response is determined by taking the dynamic response of rigid body in the first step as input, and furthermore the bending moment of roof slab is obtained. Key words: vertical seismic excitation, roof slab, soil-structure interaction, dynamic response

Dynamic Analyses of a Skewed Short-Span, Box-Girder Overpass

1994 ◽  
Vol 10 (4) ◽  
pp. 729-755 ◽  
Author(s):  
David B. McCallen ◽  
Karl M. Romstad
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Nonlinear Material ◽  
Earthquake Response ◽  
Detailed Model ◽  
Response Data ◽  
Modeling Approaches ◽  
Bridge Superstructure ◽  
Short Span ◽  
Stick Model

A number of recent research studies have provided insight into the seismic response characteristics of short-span overpass bridge systems. Application of system identification techniques to measured earthquake response data for this class of bridges has indicated that the bridge superstructure, abutments and approach embankment soil constitute a strongly coupled system. The dynamical behavior of the foundation and embankment soil have a first order influence on the dynamic response of the bridge superstructure. Analysis of measured strong motion response data has also indicated that localized nonlinear behavior of the embankment soil can result in significant nonlinear global behavior of the entire system, even when the bridge superstructure remains linear. The current paper presents the results of detailed numerical simulation studies of the dynamic response of a short-span overpass bridge system. Two distinctly different modeling approaches are investigated. The first approach utilizes simple reduced order “stick” model idealizations of the bridge, and the second approach utilizes a detailed, large scale, three dimensional finite element model. The detailed model includes a discretization of the soil embankments and a simple nonlinear material model is used to represent the hysteretic soil behavior. The sensitivity of bridge response to various parameters, such as deck skew, embankment soil stiffness and soil mass, stick model modal damping values, and soil nonlinearity has been investigated. Earthquake response predictions are performed with both model types and the response computations are compared to earthquake response data measurements. The ability of the models to accurately represent the bridge seismic response is discussed, and the two modeling approaches are compared and contrasted.

scholarly journals Seismic response of low-rise buildings

1986 ◽  
Vol 19 (3) ◽  
pp. 180-199 ◽  
Author(s):  
P. J. Moss ◽  
A. J. Carr ◽  
A. H. Buchanan
Keyword(s):  
Dynamic Response ◽  
Hysteresis Loop ◽  
Seismic Response ◽  
Earthquake Accelerograms

The results of an investigation into the dynamic response of several low-rise structures are reported. The main parameters studied were the effect of variations in the form of the hysteresis loop exhibited by the inelastic members and of differing types of earthquake accelerograms.

scholarly journals Soil Densification Effect on The Seismic Response of Structures Taking into Consideration Soil-Structure Interaction

2021 ◽  
Vol 2 (4) ◽  
pp. 13-17
Author(s):  
Radhwane Boulkhiout
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Soil Structure ◽  
Lateral Displacement ◽  
Motion Vector ◽  
Stability Index ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Seismic Force ◽  
Soil Densification

Soil compaction is a considerable construction activity to ensure safety and durability, notably in the transportation industry. This technique of compaction increases soil bulk density and soil strength, while decreases porosity, aggregate stability index, soil hydraulic conductivity, and nutrient availability, thus reduces soil health. Consequently, it lowers crop performance via stunted aboveground growth coupled with reduced root growth. Therefore, if the characteristics of the soil are changed, it will affect the response of the structures. In this work, the effect of improving soil characteristics by compaction techniques on the dynamic response of foundations and structures, taking into consideration the effect of soil-structure interaction was determined. The dynamic response of foundations is presented by the impedances functions, which are determined numerically by the CONAN program, based on the cone method. In addition, the response of the structure will be presented according to the lateral displacement in each level of it. This motion vector is a function of the forces in each level; for this, the equivalent static method was applied, which allows to calculate the seismic force at the base and its distribution on the height of the structure. The results obtained show the efficiency of soil densification on the seismic response of MDOF frames.

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