Seismic Response Analysis and Protection of Highway Overcrossings Including Soil-structure Interaction
Author: Jian Zhang
Publisher:
Published: 2002
Total Pages: 662
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: Jian Zhang
Publisher:
Published: 2002
Total Pages: 662
ISBN-13:
DOWNLOAD EBOOKAuthor: Nicos Makris
Publisher:
Published: 2001
Total Pages: 158
ISBN-13:
DOWNLOAD EBOOKAuthor: Jian Zhang
Publisher:
Published: 2001
Total Pages: 128
ISBN-13:
DOWNLOAD EBOOKAuthor: Jian Zhang
Publisher:
Published: 2001
Total Pages: 128
ISBN-13:
DOWNLOAD EBOOKAuthor: Alexander Tyapin
Publisher: ASV Construction
Published: 2019-06-11
Total Pages: 200
ISBN-13: 919822235X
DOWNLOAD EBOOKSoil-structure interaction (SSI) is an important phenomenon in the seismic response analysis. As seismologists describe seismic excitation in terms of the seismic motion of certain control point at the free surface of the initial site, the question is whether the same point of the structure (after structure appears) will have the same seismic response motion in case of the same seismic event. If yes, then seismic motion from seismologists is directly applied to the base of the structure (it is called “fixed-base analysis”), and they say that “no SSI occurs”’ (though literally speaking soil is forcing structure to move, so interaction is always present). This is a conventional approach in the field of civil engineering. However, if heavy and rigid structure (sometimes embedded) is erected on medium or soft soil site, this structure changes the seismic response motion of the soil as compared to the initial free-field picture. Such a situation is typical for Nuclear Power Plants (NPPs), deeply embedded structures, etc. The book describes different approaches to SSI analysis and different SSI effects. Special attention is paid to the Combined Asymptotic Method (CAM) developed by the author and used for the design of NPPs in seismic regions. Nowadays, some civil structures have parameters comparable to those of NPPs (e.g., masses and embedment), so these approaches become useful for the civil structural engineers as well.
Author: Thomas Albert Mar
Publisher:
Published: 2013
Total Pages: 80
ISBN-13:
DOWNLOAD EBOOKThe purpose of this project is to investigate the validity of seismic soil-foundation-structure interaction analysis of a typical California highway bridge structure subjected to near-fault ground motions. A three-dimensional nonlinear finite element model of Meloland Road Overcrossing was developed. The model included a combination of elements including shell elements for the bridge deck. The column and piles were modeled using frame elements. Abutment-backfill and ground soil were simulated using nonlinear springs. The complete bridge system was subjected to three-component recorded free-field earthquake motions. The resulting dynamic response of the bridge model was found to be in close agreement with motions recorded at various locations on the bridge. This validates the practical application and methodology of this project and may be used for evaluating the seismic response of other typical bridges.
Author: Francesco Silvestri
Publisher: CRC Press
Published: 2019-10-22
Total Pages: 5946
ISBN-13: 0429633505
DOWNLOAD EBOOKEarthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.
Author: Azer Kasimzade
Publisher: Springer Nature
Published:
Total Pages: 435
ISBN-13: 3031654072
DOWNLOAD EBOOKAuthor: Xin Zong
Publisher:
Published: 2015
Total Pages: 274
ISBN-13:
DOWNLOAD EBOOKAuthor: Yazhou Xie
Publisher:
Published: 2017
Total Pages: 232
ISBN-13:
DOWNLOAD EBOOKThis dissertation systematically addresses the modeling, quantifying, and protection of highway bridges against earthquake hazards. Firstly, the research substantially improves the p-y spring based simulation method to predict the seismic responses of highway bridges that accounts for various soil-structure interaction effects. Closed-form formulae are provided for the p-y spring input parameters to capture the bridge-embankment interaction effects, based on which an integrated step-by-step modeling procedure is developed. The procedure is applied to simulate the seismic responses of a well instrumented highway overcrossing and validated against the recorded responses during the 1992 Petrolia earthquake. Secondly, the study derives a response modification factor to quantify the relative impact of liquefaction induced lateral spreading with respect to seismic shaking on column drifts for highway bridges. The column drift response under lateral spreading is correlated to the crust layer energy imposed on the pile foundation at bridge piers. Under seismic shaking, the column drift ratio is directly related to the peak ground acceleration. By normalizing the column drift under the lateral spreading to that of under the seismic shaking, the proposed modification factor captures key features of how columns respond under both lateral spreading and seismic shaking, and offers reliable column drift demand predictions. Thirdly, this study investigates the effectiveness and optimal design of seismic protective devices for highway bridges. Component-level fragility functions are developed by using the probabilistic seismic demand analysis. To transparently quantify the bridge performance at the system level, seismic repair cost ratios are derived to combine damage probabilities, damage ratios and replacement costs of critical bridge components. Thereafter, a multi-objective genetic optimization method with the Pareto optimal concept is employed to identify the optimal design parameters of protective devices. Subsequently, the research derives a consistent performance index to facilitate the performance-based design and optimization of seismic protective devices. By converting the system-level repair cost ratio to be a function of median-level engineering demand parameters, a uniform design surface is generated for various protection designs. The derived surface can be easily implemented in the performance-based seismic protection design and optimization without iteratively updating the design goal when a new group of design parameters are considered. The robustness of the proposed method is examined in a case study to identify the optimal protection designs by using a genetic optimization scheme. Lastly, the study derives the seismic demand models for bridge rocking columns with foundation on rigid supports when subject to horizontal near-fault strong motions. The system equations of motion are derived and solved to incorporate the column flexibility and the rocking impact mechanism. By representing the near-fault ground motions with corresponding pulses, dimensional analyses are carried out to regress the closed-form expressions of system's drift and uplift demands. A rigorous validation process is implemented to demonstrate that the proposed models can be used with confidence to predict the seismic demands of the rocking system directly from structural and ground motion characteristics.