Deconstructable and Recyclable Steel-Concrete and Steel-Timber Composite Buildings
报告题目：Deconstructable and Recyclable Steel-Concrete and Steel-Timber Composite Buildings
An important aspect of designing sustainable building structures is that they should be deconstructable at the end of their service life, to enable the reuse of materials and to eliminate the energy associated with their demolition and disposal. In steel-framed buildings with concrete flooring systems attached with headed stud steel shear connectors, deconstruction is problematic because of the embedment of the headed studs into the cast in situ concrete slab.
The main presentation describes an alternate system of construction, in which semi-rigid steel frames are constructed using bolted joints, either to I-section columns or to concrete-filled steel tubes using flush end plate connections. The concrete floor is made from slabs of precast geopolymer concrete, connected to the steel beams by friction-grip high-strength steel bolts in pre-drilled clearance holes. The tensioning of the friction-grip bolts is shown to provide substantial interface friction, thereby providing the beams with full shear interaction in the service load range of response. The experimental study, which confirms the deconstructability of the system, is used to calibrate finite element analysis and to formulate design proposals.
A shorter subsequent presentation introduces work nearing completion on steel-timber composite buildings, which have even greater attributes in terms of the carbon footprint of a building, as plantation timber sequestrates carbon dioxide during its growth. This study also demonstrates that such a structural system is robust and ductile.
Professor Mark Bradford is currently a Scientia Professor at UNSW Sydney, Federation Fellow and Professor of Civil Engineering, and is the Director of Research and Founding Director of the Centre for Infrastructure Engineering and Safety within UNSW Sydney’s School of Civil and Environmental Engineering. The work reported in the presentation was undertaken when Prof Bradford held a prestigious Australian Laureate Fellowship, which was preceded by an Australian Federation Fellowship in which he undertook research on steel and composite structures subjected to fire loading. His work on deconstructable composite buildings earned him the prize for “Excellence in Engineering & Information and Communications Technology” in the New South Wales Premier’s Prizes for Science and Engineering in 2015. In recent years, Prof. Bradford has been awarded the Shortridge Hardesty Award of the ASCE, the John Connell Medal of Engineers Australia and bestowed Distinguished Membership of the ASCE; the first Australian structural engineer so honoured in the 165-year history of the ASCE. He currently chairs the National Committee on Mechanical and Engineering Sciences of the Australian Academy of Science.
Mark Bradford教授是澳大利亚新南威尔士大学的科学讲座教授，是澳大利亚联邦科学院院士，是新南威尔士大学悉尼校区土木与环境工程学院基础设施工程与安全中心的主任及创始人。他是国际公认的结构工程领域专家，出版了各种语言版本的15本书，撰写了超过600多篇的科学论文，担任14个国际期刊的编委和澳大利亚四个结构工程委员会的委员。本次报告是Bradford教授在担任澳大利亚卓越研究员期间进行的一项工作，该研究是在澳大利亚联邦基金资助下进行的一项火灾下钢和组合结构的研究。他在可拆卸组合建筑结构中的研究使他荣获了2015年新南威尔士的科学和工程优秀奖。近年来，Bradford教授荣获了美国土木工程师协会（ASCE）颁发的Shortridge Hardesty奖，澳大利亚工程师协会的最高奖John Connell Medal，并获得由美国土木工程师协会颁发的“杰出资深成员奖”，他是澳大利亚结构工程领域被美国土木工程师协会在其165年的历史里授予杰出资深会员的第一人。他目前是澳大利亚科学院机械与工程科学委员会的主席。