报告题目：Nonlinear simulation of full-scale testing of transmission towers（输电塔全尺寸试验的非线性仿真模拟）

报告人：Professor S. Kitipornchai，Professor F. Albermani (昆士兰大学土木工程学院)

报告时间：2019年1月9日下午16:00-17:00

报告地点：校本部东区土木楼312

报告简介

Among civil structures the design of transmission towers is rather unique in the sense that full-scale testing is mandated to verify the design. Full-scale testing requires specialised testing stations and is expensive and time consuming to conduct. Furthermore, findings from the full-scale test can not be quickly implemented and verified.

A nonlinear analytical technique for predicting and simulating the ultimate structural behaviour of self-supporting and guyed transmission towers under static load conditions has been developed. The method considered both the geometric and material nonlinear effects and treated the angle members in the tower as general asymmetrical thin-walled beam-column elements. Modelling of material nonlinearity for angle members was based on the assumption of lumped plasticity coupled with the concept of a yield surface in force space.

Using this approach, upgrading of existing towers can be investigated. A possible upgrading strategy is the introduction of a series of diaphragm bracing systems at mid-height of the slender diagonal members. Analytical studies showed that considerable strength improvements predictions and allowed recommendations on the most efficient diaphragm bracing types. An upgrade scheme that used the most efficient diaphragm bracing type was successfully implemented on existing towers. This scheme used less steel than the replacement of the existing diagonal bracings, was easier to implement in practice, and led to improved tower performance. The effectiveness of this upgrading scheme was further confirmed through experimental studies using a tower sub-structure assembly that was strengthened with a variety of diaphragm bracings under two types of loading.

主讲人简介

Professor S. Kitipornchai

Regional Editor, Engineering Structures

School of Civil Engineering, University of Queensland, Australia

Professor S Kitipornchai is from the School of Civil Engineering at the University of Queensland, Australia. He is a Fellow of the Australian Academy of Technological Sciences and Engineering (ATSE) and a Fellow of the European Academy of Sciences and Arts (EASA). He has been awarded Honorary Professor at Tsinghua University; Beijing Jiaotong University; and Tongji University. He is the Regional Editor of Engineering Structures journal since 1993. His research interests are in the areas of structural stability, steel structures, transmission towers, computational mechanics, advanced composite and smart materials. He has published over 338 journal papers, and 8 books, with a web of science h-index of 53 and over 10,000 citations.

He has been with the University of Queensland since 1976. From 2001 to 2012, he worked at the City University of Hong Kong and was Head of Department for 6 years, during which time he established the discipline of Civil Engineering and the Department of Architecture and Civil Engineering for City University of Hong Kong.

He has won many awards that include the Tileman Prize, the James Hardies Award, the Munro Prize, the University of Queensland Teaching Excellence Award, and the Monash Civil Engineering Alumnus of the Year Award. Recently he was awarded the Nishino Medal from the EASEC Conference.

Professor F. Albermani

Central Queensland University, Australia

Faris Albermani is a Professor of Structural Engineering at Central Queensland University (CQU), Australia. Prior to joining CQU in 2017, he was with the University of Queensland (UQ) for nearly 30 years where he worked with Prof S. Kitipornchai on various aspects of structural engineering including transmission towers. His research focus has been on transmission structures, purlin-sheeting systems, energy dissipation devices, deep subsea pipelines and biomechanics. He has 21 PhD candidates successfully completed their research with him at UQ and was awarded teaching excellence award at UQ (2007) and CQU (2017 and 2018).