Deconstructable Systems for Sustainable Design of Steel and Composite Structures

这个项目探索了一种新的设计方法，即为解构而设计，这种方法已经出现，以促进未来材料的重复使用。拟议研究的目标是开发新的结构体系概念，并为可拆解的钢结构和钢/混凝土组合结构建立全面的生命周期评估。解构设计，再加上回收材料的使用，将促进可持续建筑。钢/混凝土组合楼板体系是迄今为止商业和机构建筑中最普遍的结构钢框架类型，是这项工作的重点。这些地板系统目前需要整体式结构，以确保足够的性能。虽然这些地板系统材料可以回收利用，但目前它们不能在建筑物中重新软化和重复使用。拟议的系统保持了钢和混凝土建筑复合行动带来的效率好处，包括减少钢梁尺寸和灵活的楼板框架模式，同时直接满足建筑业减少浪费的需要。研究包括通过进行夹紧连接的全尺寸构件试验来量化可解构连接的行为，以及对拟议的可解构组合楼盖体系进行全尺寸试验和验证性分析，以验证系统的完整性。该项目包括推进对可拆解系统进行环境生命周期评估的方法，以及制定可拆解钢框架系统的设计战略。通过将预制策略与解构设计相结合，以实现组合楼板系统的直接可重复使用，本研究有望为预测可持续钢结构的行为和设计建立基本策略。再加上可拆卸钢框架系统生命周期评估战略的进步，这项研究有望为鼓励和编纂减少钢结构行业的材料使用和相关的环境影响提供基础知识。由于建筑施工在与建筑相关的所有环境影响中占很大一部分，重复使用复合地板将具有显著的环境效益。

This project explores a new design approach, Design for Deconstruction that has emerged to facilitate future reuse of materials. The objectives of the proposed research are to develop new structural system concepts and establish comprehensive life-cycle assessment for deconstructable steel and composite steel/concrete construction. Design for Deconstruction coupled with the use of recycled materials will facilitate sustainable construction. Composite steel/concrete floor systems, by far the most ubiquitous type of structural steel framing for commercial and institutional buildings, is a key focus of this work. These floor systems currently require monolithic construction to ensure adequate performance. While these floor system materials may be recycled, currently they cannot be refabricated and reused in buildings. The proposed system maintains the efficiency benefits offered by composite action of steel and concrete construction, including reduced steel beam sizes and flexible floor framing patterns, while directly addressing the need to reduce waste in the construction industry. The research includes quantification of deconstructable connection behavior through conducting full-scale component tests of clamping connections, and conducting full-scale tests and corroborating analyses of the proposed deconstructable composite floor system to validate the integrity of the system. The project includes advancement of the methodologies for conducting environmental life-cycle assessment of deconstructable systems, and developing design strategies for deconstructable steel framing systems. The proposed research is expected to establish fundamental strategies for predicting the behavior and design of sustainable steel structures through combining prefabrication strategies with Design for Deconstruction to achieve direct reusability of composite floor systems. Coupled with advancement in life-cycle assessment strategies for deconstructable steel framing systems, this research is expected to provide fundamental knowledge towards encouraging and codifying a reduction in material use and associated environmental impacts in the steel construction industry. Since building construction accounts for a significant portion of all environmental impacts associated with buildings, reusing composite floors will have significant environmental benefits.