报告题目：Seismic Analysis and Safety Assessment of Cracked Concrete Dams

Microsoft Teams： https://teams.live.com/meet/95964523666467

报 告 人： Martin Wieland 博士 （国际大坝委员会大坝抗震专委会主席）

时   间 ：2021年11月9日（周二）15:00-17:00

地   点：河海大学江宁校区乐学楼1116室

主办单位:  河海大学力学与材料学院动力学与控制研究所   

报告内容简介：  

The objective of any dam analysis is to predict its behaviour as accurately as possible. For the seismic design of large dams two levels of earthquakes are specified in ICOLD Bulletin 148 (Selecting seismic parameters for large dams): (i) For the operating basis earthquake (OBE) the seismic performance criteria are given in terms of stresses and deformations and (ii) for the safety evaluation earthquake (SEE) they are mainly specified in terms of displacements. The simplest dynamic stability analyses carried out for the SEE are rigid body analyses such as the Newmark sliding block method. A thorough understanding of the inelastic and nonlinear seismic phenomena, which are expected during strong ground shaking, is the prerequisite for any nonlinear seismic analysis of dams. The appropriate methods of dynamic analyses are discussed. In arch dams, strong ground shaking could lead to opening of block joints and the contact between concrete and foundation rock, and the formation of cracks along horizontal lift joints. The methods for nonlinear dynamic analysis of dams are, however, still under development. Nonlinear seismic analyses need substantial engineering judgment. The main subjects discussed in the presentation are as follows: observed seismic cracking of concrete dams, damping of large concrete dams, modelling of the earthquake ground motion for the design and safety assessment of large concrete dams, and an example of the post-cracking stability analysis of a dam is given.

报告人简介：

Dr. Martin Wieland is the Chairman of the ICOLD Committee on Seismic Aspects of Dam Design and is a senior dam and earthquake expert at AFRY Switzerland, where he has been involved in the seismic safety evaluation of several dams and the design of major infrastructure projects. He obtained his MSc. and PhD in civil engineering from the Swiss Federal Institute of Technology in Zurich, Switzerland. He has received an Honorary Professorship from Hohai University in Nanjing, China in 2002 and he has authored over 300 technical papers in the fields of dam and earthquake engineering.