权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Achieving Sustainable Urban Buildings with Seismically Resilient Mass Timber Core Wall and Floor System

利用抗震大体积木芯墙和地板系统实现可持续城市建筑

基本信息

批准号：
1563612
负责人：
Peter Dusicka
金额：
$ 40万
依托单位：
Portland State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-04-01 至 2022-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1563612&HistoricalAwards=false
关键词：
Achieving Sustainable Urban Buildings Seismically

项目摘要

The urgency in increasing growth in densely populated urban areas, reducing the carbon footprint of new buildings, and targeting rapid return to occupancy following disastrous earthquakes has created a need to reexamine the structural systems of mid- to high-rise buildings. To address these sustainability and seismic resiliency needs, the objective of this research is to enable an all-timber material system in a way that will include architectural as well as structural considerations. Utilization of mass timber is societally important in providing buildings that store, instead of generate, carbon and increase the economic opportunity for depressed timber-producing regions of the country. This research will focus on buildings with core walls because those building types are some of the most common for contemporary urban mid- to high-rise construction. The open floor layout will allow for commercial and mixed-use occupancies, but also will contain significant technical knowledge gaps hindering their implementation with mass timber. The research plan has been formulated to fill these gaps by: (1) developing suitable mid- to high-rise archetypes with input from multiple stakeholders, (2) conducting parametric system-level seismic performance investigations, (3) developing new critical components, (4) validating the performance with large-scale experimentation, and (5) bridging the industry information gaps by incorporating teaching modules within an existing educational and outreach framework. Situated in the heart of a timber-producing region, the multi-disciplinary team will utilize the local design professional community with timber experience and Portland State University's recently implemented Green Building Scholars program to deliver technical outcomes that directly impact the surrounding environment.Research outcomes will advance knowledge at the system performance level as well as at the critical component level. The investigated building system will incorporate cross laminated timber cores, floors, and glulam structural members. Using mass timber will present challenges in effectively achieving the goal of desirable seismic performance, especially seismic resiliency. These challenges will be addressed at the system level by a unique combination of core rocking combined with beam and floor interaction to achieve non-linear elastic behavior. This system behavior will eliminate the need for post-tensioning to achieve re-centering, but will introduce new parameters that can directly influence the lateral behavior. This research will study the effects of these parameters on the overall building behavior and will develop a methodology in which designers could use these parameters to strategically control the building seismic response. These key parameters will be investigated using parametric numerical analyses as well as large-scale, sub-system experimentation. One of the critical components of the system will be the hold-down, a device that connects the timber core to the foundation and provides hysteretic energy dissipation. Strength requirements and deformation demands in mid- to high-rise buildings, along with integration with mass timber, will necessitate the advancement of knowledge in developing this low-damage component. The investigated hold-down will have large deformation capability with readily replaceable parts. Moreover, the hold-down will have the potential to reduce strength of the component in a controlled and repeatable way at large deformations, while maintaining original strength at low deformations. This component characteristic can reduce the overall system overstrength, which in turn will have beneficial economic implications. Reducing the carbon footprint of new construction, linking rural and urban economies, and increasing the longevity of buildings in seismic zones are all goals that this mass timber research will advance and will be critical to the sustainable development of cities moving forward.

在人口稠密的城市地区加快增长，减少新建筑的碳足迹，以及在灾难性地震后迅速恢复居住的紧迫性，导致有必要重新审查中高层建筑的结构系统。为了满足这些可持续性和地震恢复力的需求，这项研究的目标是以一种包括建筑和结构考虑的方式实现全木材材料系统。大量木材的利用在提供储存碳而不是产生碳的建筑物方面具有重要的社会意义，并增加了该国不景气的木材产区的经济机会。这项研究将集中在有核心墙的建筑上，因为这些建筑类型是当代城市中高层建筑中最常见的一些。开放式楼层布局将允许商业和混合用途的占用，但也将包含重大的技术知识差距，阻碍它们与大量木材的实施。为填补这些空白，制定了研究计划：(1)利用多个利益攸关方的投入开发合适的中高层建筑原型，(2)进行参数系统级抗震性能调查，(3)开发新的关键部件，(4)通过大规模试验验证性能，以及(5)通过将教学模块纳入现有的教育和推广框架，弥合行业信息差距。位于木材产区的中心，多学科团队将利用当地具有木材经验的专业设计社区和波特兰州立大学最近实施的绿色建筑学者计划，提供直接影响周围环境的技术成果。研究成果将促进系统性能水平和关键部件水平的知识。被调查的建筑系统将包括交叉叠层木芯、地板和胶合板结构构件。使用大量木材将给有效实现理想的抗震性能目标带来挑战，特别是地震恢复力。这些挑战将在系统层面上通过核心摇摆和梁与地板相互作用的独特组合来解决，以实现非线性弹性行为。这一系统性能将消除后张法实现重新定心的需要，但将引入可直接影响侧向性能的新参数。这项研究将研究这些参数对整体建筑行为的影响，并将开发一种方法，使设计人员可以使用这些参数来战略性地控制建筑地震反应。这些关键参数将通过参数数值分析和大规模分系统实验进行研究。该系统的关键部件之一将是压板，这是一种将木芯连接到基础并提供滞回能量耗散的装置。中高层建筑的强度要求和变形要求，以及与大量木材的集成，将需要在开发这种低损害部件方面提高知识。所研究的压下机将具有很大的变形能力，零件易于更换。此外，压紧有可能在大变形时以受控和可重复的方式降低部件的强度，同时在低变形时保持原始强度。这种组件特性可以减少整个系统的过度强度，这反过来又会产生有益的经济影响。减少新建筑的碳足迹，连接农村和城市经济，增加地震区建筑的寿命，这些都是这项大规模木材研究将推进的目标，对城市的可持续发展至关重要。