Wave 2002: Wave Propagation - Moving Load - Vibration Reduction

Proceedings of the WAVE 2002 Workshop, Yokohama, Japan, 2002

Nawawi Chouw, Günther Schmid

• Publisher: CRC Press
• Year: 2021
• ISBN:
  9781000446791
• Edition: 1
• Topic: Technology & Engineering
• Subtopic: Civil Engineering
• Index: Technology & Engineering

Detailing the proceedings of the Wave 2002 workshop at Okayama University in Japan, this collection of eighteen peer-reviewed papers concerns the issue of the ground vibration and noise caused by construction activities, explosions in the ground, or high-speed trains.
Providing key information for engineers, researchers, scientists, practitioners, teachers and students working in the field of structural dynamics or soil dynamics, this text also includes a useful address list in the appendix to enable readers to gather further information if required.

Vibration reduction

Reduction of response and first excursion probability for random excitation using nonlinear characteristics

S. Aoki

Tokyo Metropolitan College of Technology, Tokyo, Japan

ABSTRACT: Structures subjected to dynamic load have nonlinear characteristics in nature. Dynamic loads are sometimes random. In such a case, reliability of important structures is evaluated in probabilistic manner. First excursion failure is one of the most important failure modes of the structure. In this paper, methods for obtaining the response and the first excursion probability of the structure with nonlinear characteristic subjected to random dynamic load are presented. For simplicity, single-degree-of-freedom system is used as analytical model. Two-degree-of-freedom system is also used in order to examine coupling effect of two systems. Hysteresis loop characteristic caused by plastic deformation is considered. The mean square value of the response and the first excursion probability are obtained. It is concluded that the response and the first excursion probability are reduced by considering the hysteresis loop characteristic caused by plastic deformation.

1 INTRODUCTION

Structures subjected to dynamic load have nonlinear characteristics in nature. For example, joints and supports have friction and impact characteristics (Dupont and Bapana 1994) (Lau and Zhang 1992). When structures are subjected to excess load, stress is beyond yield point (Clough and Penzien 1993). Furthermore, in order to prevent from failure of the structures subjected to dynamic load, many types of dampers for reduction of response are used. Nonlinear characteristics are applied to some dampers in order to absorb vibration energy. For example, elasto-plastic damper, friction damper and impact damper are practically used (Soong and Dargush. 1997).

Dynamic loads are sometimes random (Soong and Grigoriu 1992). For example, earthquake, wind and wave loads are random vibration. Road and rail have random surface and cars and trains are subjected to random excitations. In such a case, reliability of important structures is evaluated in probabilistic manner (Lin 1967). Some failure modes are observed in failure of actual structures. First excursion failure is one of the most important failure modes of the structure (Solnes 1997).

In this paper, metho...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Foreword
• Foreword of the Dean of the Faculty of Environmental Science and Technology, Okayama University
• Foreword of the President of the Okayama University
• Foreword of the Dean of the Faculty of Civil Engineering, Ruhr University Bochum
• Foreword of the Rector of the Ruhr University Bochum
• Organization
• Ground vibrations and blast induced vibrations
• Moving load
• Vibration reduction
• Track-soil analysis
• Numerical and experimental investigation
• Noise pollution
• Final discussion
• Miscellaneous
• Author index