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| 1 | Seismic response of bridge pier on rigid caisson foundation in soil stratum显示文摘An analytical method to study the seismic response of a bridge pier supported on a rigid caisson foundation embedded in a deep soil stratum underlain by a homogeneous half space is developed. The method reproduces the kinematic and inertial responses, using translational and rotational distributed Winkler springs and dashpots to simulate the soil-caisson interaction. Closed-form solutions are given in the frequency domain for vertical harmonic S-wave excitation. Comparison with results from fi nite element (FE) analysis and other available solutions demonstrates the reliability of the model. Results from parametric studies are given for the kinematic and inertial responses. The modif ication of the fundamental period and damping ratio of the bridge due to soil-structure interaction is graphically illustrated. | C. Tsigginos N. Gerolymos D. Assimaki G. Gazetas | 2008 | Earthquake Engineering and Engineering Vibration2008，7，1： | 5 |
| 2 | Numerical modeling of centrifuge cyclic lateral pile load experiments显示文摘To gain insight into the inelastic behavior of piles, the response of a vertical pile embedded in dry sand and subjected to cyclic lateral loading was studied experimentally in centrifuge tests conducted in Laboratoire Central des Ponts et Chaussées. Three types of cyclic loading were applied, two asymmetric and one symmetric with respect to the unloaded pile. An approximately square-root variation of soil stiffness with depth was obtained from indirect in-flight density measurements, laboratory tests on reconstituted samples, and well-established empirical correlations. The tests were simulated using a cyclic nonlinear Winkler spring model, which describes the full range of inelastic phenomena, including separation and re-attachment of the pile from and to the soil. The model consists of three mathematical expressions capable of reproducing a wide variety of monotonic and cyclic experimental p-y curves. The physical meaning of key model parameters is graphically explained and related to soil behavior. Comparisons with the centrifuge test results demonstrate the general validity of the model and its ability to capture several features of pile-soil interaction, including: soil plastifi cation at an early stage of loading, 'pinching' behavior due to the formation of a relaxation zone around the upper part of the pile, and stiffness and strength changes due to cyclic loading. A comparison of the p–y curves derived from the test results and the proposed model, as well as those from the classical curves of Reese et al. (1974) for sand, is also presented. | Nikos Gerolymos Sandra Escoffier George Gazetas Jacques Garnier | 2009 | Earthquake Engineering and Engineering Vibration2009，8，1： | 5 |
| 3 | Simplified approach for design of raft foundations against fault rupture.Part II:soil-structure interaction显示文摘This is the second paper of two, which describe the results of an integrated research effort to develop a four-step simplified approach for design of raft foundations against dip-slip (normal and thrust) fault rupture. The first two steps dealing with fault rupture propagation in the free-field were presented in the companion paper. This paper develops an approximate analytical method to analyze soil-foundation-structure interaction (SFSI), involving two additional phenomena: (i) fault rupture diversion (Step 3); and (ii) modification of the vertical displacement profile (Step 4). For the first phenomenon (Step 3), an approximate energy-based approach is developed to estimate the diversion of a fault rupture due to presence of a raft foundation. The normalized critical load for complete diversion is shown to be a function of soil strength, coefficient of earth pressure at rest, bedrock depth, and the horizontal position of the foundation relative to the outcropping fault rupture. For the second phenomenon (Step 4), a heuristic approach is proposed, which 'scans' through possible equilibrium positions to detect the one that best satisfies force and moment equilibrium. Thus, we account for the strong geometric nonlinearities that govern this interaction, such as uplifting and second order (P-Δ) effects. Comparisons with centrifuge-validated finite element analyses demonstrate the efficacy of the method. Its simplicity makes possible its utilization for preliminary design. | I. Anastasopoulos N. Gerolymos G. Gazetas M. F. Bransby | 2008 | Earthquake Engineering and Engineering Vibration2008，7，2： | 3 |
| 4 | Behaviour of deep immersed tunnel under combined normal fault rupture deformation and subsequent seismic shaking显示文摘 | Ioannis Anastasopoulos Nikos Gerolymos Vasileios Drosos Takis Georgarakos Rallis Kourkoulis George Gazetas | 2008 | Bulletin of Earthquake Engineering2008，，2： | 2 |
| 5 | Simplified approach for design of raft foundations against fault rupture.Part I:free-field显示文摘Over the past few decades, earthquake engineering research mainly focused on the effects of strong seismic shaking. After the 1999 earthquakes in Turkey and Taiwan, and thanks to numerous cases where fault rupture caused substantial damage to structures, the importance of faulting-induced deformation has re-emerged. This paper, along with its companion (Part II), exploits parametric results of finite element analyses and centrifuge model testing in developing a four-step semi-analytical approach for analysis of dip-slip (normal and thrust) fault rupture propagation through sand, its emergence on the ground surface, and its interaction with raft foundations. The present paper (Part I) focuses on the effects of faulting in the absence of a structure (i.e., in the free-field). The semi-analytical approach comprises two-steps: the first deals with the rupture path and the estimation of the location of fault outcropping, and the second with the tectonically-induced displacement profile at the ground surface. In both cases, simple mechanical analogues are used to derive simplified semi-analytical expressions. Centrifuge model test data, in combination with parametric results from nonlinear finite element analyses, are utilized for model calibration. The derived semi-analytical expressions are shown to compare reasonably well with more rigorous experimental and theoretical data, thus providing a useful tool for a first estimation of near-fault seismic hazard. | I. Anastasopoulos N. Gerolymos G. Gazetas M. F. Bransb | 2008 | Earthquake Engineering and Engineering Vibration2008，7，2： | 2 |
| 6 | Behaviour of deep immersed tunnel under combined normal fault rupture deformation and subsequent seismic shaking显示文摘 | Ioannis Anastasopoulos Nikos Gerolymos Vasileios Drosos Takis Georgarakos Rallis Kourkoulis George Gazetas | 2008 | Bulletin of Earthquake Engineering2008，，2： | 2 |
| 7 | Response of three Athens metro underground structures in the 1999 Parnitha earthquake 显示文摘 | Gazetas G Gerolymos N Anastasopoulos I | 2005 | Soil Dynamics and Earthquake Engineering2005，25，78910： | 1 |
| 8 | Nonlinear response of deep immersed tunnel to strong seismic shaking 显示文摘 | Anastasopoulos I Gerolymos N Drosos V | 2007 | Journal of Geotechnical and Geoenvironmental Engineering2007，133，9： | 1 |
| 9 | Neural network analysis of overturning response under near-fault type excitation显示文摘在强壮的地震刺激下面,僵硬的块将从它的支持高举并且经历摇可以导致的摆动(完全) 翻。这个高度非线性的颤动问题的数字、分析的答案首先在纸被加亮然后利用了表明翻的行为怎么敏感不仅到紧张和基础运动的频率内容,而且到强壮的脉搏的存在,到他们的详细顺序,并且弄平到他们的不对称现象。能够代表影响的鈥渞u pture 择向性鈥 ? 和鈥渇l ing 鈥 ? 的五理想化的脉搏在差错附近扎根了运动,被利用到这个目的:一个周期湾穴,一个周期 cosinus, Ricker 小浪,截断的(T)-Ricker 小浪,和矩形的脉搏鈥淥v erturning 加速扩大鈥 ? 和鈥淩o tation 鈥 ? 系列被介绍并且介绍。人工的神经网络建模然后作为一个其他的数字答案被开发。神经网络分析为预言僵硬的块的翻的失败或幸存导致靠近形式的表达式,作为它的几何性质的一个函数和刺激时间历史的特征。当模特儿的发达神经网络的能力与数字答案通过比较被验证。导出的分析表情能也为估计近差错的地面运动的破坏用作一个工具,因为对与基础摇敏感的结构高举。关键词翻 - 高举 - 脉搏 - 近差错的运动 - 神经网络 - 摇光谱 - Kocaeli | Nikos Gerolymos Marios Apostolou George Gazetas | 2005 | Earthquake Engineering and Engineering Vibration2005，4，2： | 1 |
| 10 | Non- linear response of deep immersed tunnel to strong seismic shaking显示文摘 | Anastasopoulos I Gerolymos N Drosos V | 2007 | Journal of Geotechnical & Geo-en- vironmental Engineering2007，133，9： | 1 |
| 11 | Advances in the numerical integration of the three-dimensional Euler equations in vibrating cascades 显示文摘 | Gerolymos G A | 1993 | Journal of Turbomachinery1993，115，4： | 1 |
| 12 | Tip-clearance and secondary flows in a transonic compressor rotor显示文摘 | Gerolymos G A Vallet Ⅰ | 1999 | Turhomaeh1999，121，4： | 1 |
| 13 | Winlder model for lateral response ofrigid foundations in linear soil显示文摘 | Gerolymos N Gazetas G | 2006 | Soil Dynamicsand Earthquake Engineering2006，26，05： | 1 |
| 14 | Phenomenological model ap- plied to inelastic response of soil-pile interaction systems 显示文摘 | Nikos Gerolymos George Gazetas | 2005 | Soils and foundations2005，45，4： | 1 |
| 15 | Phase II study of irinotecan plus leucovorin and bolus 5-fluorouracil as first- or sec- ond-line chemotherapy in patients with advanced gastric or esophageal-gastric junction adenocarcinoma显示文摘 | Koutras AK Gerolymos MK Kontogeorgou E | 2007 | J Chemother2007，19，6： | 1 |
| 16 | Nonlinear response of deep immersed tunnel to strong seismic shaking 显示文摘 | loannis Anastasopoulos Nikos Gerolymos Vasileios Drosos | 2007 | Journal of Geotechnical and Geoenvironmental Engineering2007，133，9： | 1 |
| 17 | Development of Winkler model for static and dynamic response of caisson foundations with soil and interface nonlinearities显示文摘 | GEROLYMOS N GAZETAS G | 2006 | Soil Dynamics and Earthquake Engineering2006，26，： | 1 |
| 18 | Tip-clearance and secondary flows in a transonic compressor rotor显示文摘 | Gerolymos G A Vallet I | 1999 | Turbomach1999，121，4： | 1 |
| 19 | Winkler model for lateral response of rigid foundations in linear soil显示文摘 | Gerolymos N Gazetas G | 2006 | Soil Dynamics and Earthquake Engineering2006，26，： | 1 |
| 20 | Static and dynamic response of massive caisson foundations with soil and interface nonlinearities--validation and restdts显示文摘 | GEROLYMOS N GAZETAS G | 2006 | Soil Dynamics and Earthquake Engineering2006，26，： | 1 |
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