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Sliding response of gravity dams including vertical seismic accelerations

Earthquake Engineering and Engineering Vibration 2003年第2期2卷 189-200页

作者： constantin christopoulos PierreLéger André Filiatrault Department of Civil Engineering University of TorontoCanada Assistant Professor Department of Civil Engineering Ecole PolytechniqueMontrealCanada Professor Department of Civil Structural and Environmental EngineeringUniversity at BuffaloUSA Professor

Seismic safety assessment of gravity dams has become a major concern in many regions of the world while the effects of vertical seismic accelerations on the response of structures remain poorly *** paper first investigates the effect of including vertical accelerations in the sliding response analysis of gravity dams subjected to a range of historical ground motion records separated in two groups according to their source-to-site *** showed that the incidence of vertical accelerations on the sliding response of gravity dams is significantly higher for near-source records than for far- source *** pseudo-static 30% load combination rule,commonly used in practice to account for the non-simultaneous occurrence of the peak horizontal and vertical accelerations,yielded good approximations of the minimum safety factors against sliding computed from time-history analyses.A method for empirically estimating the vertical response spectra based on horizontal spectra,accounting for the difference in frequency content and amplitudes between the two components is *** from analyses using spectrum compatible horizontal and vertical synthetic records also approximated well the sliding response of a gravity dam subjected to series of simultaneous horizontal and vertical historical earthquake records.

关键词： vertical accelerations sliding gravity dams synthetic accelerograms pseudo-static combinations frequency

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Real-time hybrid simulation of structures equipped with viscoelastic-plastic dampers using a user-programmable computational platform

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Earthquake Engineering and Engineering Vibration 2017年第4期16卷 693-711页

作者： Jack Wen Wei Guo Ali Ashasi-Sorkhabi Oya Mercan constantin christopoulos Kinetica 1235 Bay St.Suite 1004ONM5R 3K4 Department of Civil Engineering University of Waterloo200 University Avenue WWaterlooONN2L 3G1Canada Department of Civil Engineering University of Toronto35 St.George StreetTorontoONM5S 1A4Canada

A user-programmable computational/control platform was developed at the University of Toronto that offers real-time hybrid simulation （RTHS） capabilities. The platform was verified previously using several linear physical substructures. The study presented in this paper is focused on further validating the RTHS platform using a nonlinear viscoelastic-plastic damper that has displacement, frequency and temperature-dependent properties. The validation study includes damper component characterization tests, as well as RTHS of a series of single-degree-of-freedom （SDOF） systems equipped with viscoelastic-plastic dampers that represent different structural designs. From the component characterization tests, it was found that for a wide range of excitation frequencies and friction slip loads, the tracking errors are comparable to the errors in RTHS of linear spring systems. The hybrid SDOF results are compared to an independently validated thermal- mechanical viscoelastic model to further validate the ability for the platform to test nonlinear systems. After the validation, as an application study, nonlinear SDOF hybrid tests were used to develop performance spectra to predict the response of structures equipped with damping systems that are more challenging to model analytically. The use of the experimental performance spectra is illustrated by comparing the predicted response to the hybrid test response of 2DOF systems equipped with viscoelastic-plastic dampers.

关键词： real-time hybrid simulation user-programmable computational/control platform supplemental dampers performance spectra

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维普期刊数据库

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Great Plain-Building in North China

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地质学报 1947年 299-319页

作者： constantin P. christopoulos University of Thessaloniki Greece

Baron F. RICHTHOFEN, the famous geographer and geologist, in his monumental five-volume "China" discusses in length the formation of the North China plain. Dealing mainly with the plain of Peiping-Tientsin he distingu... 详细信息

关键词： Great Plain-Building in North China

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