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Investigation of a Novel Pressurized Sand Damper for Sustainable Seismic and Wind Protection of Buildings

研究用于建筑物可持续抗震和防风的新型加压沙阻尼器

基本信息

批准号：
2036131
负责人：
Nicos Makris
金额：
$ 58.48万
依托单位：
Southern Methodist University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-10-01 至 2024-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2036131&HistoricalAwards=false
关键词：
Investigation Novel Pressurized Sand Damper

项目摘要

Over the last 40 years, a variety of well-engineered structures, designed according to building codes that were valid at the time of their construction, experienced severe damage during earthquakes. Most of this damage was the result of excessive seismic displacements, and subsequent research has sought to enhance the seismic performance of civil structures through the development of various strategies to dampen structural displacements. Many existing technologies, however, are disruptive and costly. This research will perform laboratory testing and computer simulations for a newly developed damper, where the material enclosed within the damper is pressurized sand. This research will advance the state-of-the-art in high-performance structures by using a pressurized sand damper (PSD) device, which can perform well under a wide range of temperatures and is low-cost. Scientific understanding and advancement of the PSD will contribute to the welfare of society by mitigating human and economic losses caused by severe earthquake and prolonged wind loading, while meeting current requirements of longevity and sustainability of built infrastructure. Another advantage of the PSD is that it consists only of traditional materials (sand and steel) along with the established technology of post-tensioning, with which civil engineers are most familiar. Educational, outreach, and research activities will be created for middle and high school, undergraduate, and graduate students, including the university's Summer Camps for Girls. Experimental and simulation data generated by this project will be made available publicly in the NSF-supported Natural Hazards Engineering Engineering Research Infrastructure (NHERI) Data Depot (https://www.DesignSafe-CI.org). This award contributes to NSF's roles in the National Earthquake Hazards Reduction Program (NEHRP) and the National Windstorm Impact Reduction Program (NWIRP). The original contribution of this research is the development and the experimental and numerical validation of an innovative, low-cost, long-stroke, environmentally friendly, stable PSD that meets the criteria for sustainable engineering without suffering from the challenge of viscous heating. Energy dissipation in the PSD originates from the shearing action of the pressurized sand that exploits the pressure-dependent shear strength of the sand and its effect on increasing the dissipated energy during cyclic motion. The specific goals of this research are to (a) perform comprehensive testing on various configurations of the prototype damper to identify the physical similarities and scaling laws that govern the prototype design; (b) provide continuous, real-time monitoring and adjustment of the internal pressure of the sand damper; (c) conduct numerical modeling of the sand flow/behavior of the PSD using the discrete element method while utilizing crushable models of sand grains, which upon validation with the experimental data will allow for the design of sand dampers at various scales and configurations; and (d) refine a recently developed macroscopic, phenomenological model of the PSD that can be incorporated in open source codes such as OpenSees.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在过去的40年里，根据建筑时有效的建筑规范设计的各种精心设计的结构在地震中遭受了严重的破坏。这种破坏大多是由于地震位移过大造成的，随后的研究试图通过开发各种策略来抑制结构位移，从而提高土木结构的抗震性能。然而，许多现有技术具有破坏性且成本高昂。这项研究将进行实验室测试和计算机模拟的一个新开发的阻尼器，其中的阻尼器内的材料是加压砂。这项研究将通过使用加压砂阻尼器（PSD）设备来推进高性能结构的最新技术，该设备可以在很宽的温度范围内表现良好，并且成本低。对PSD的科学理解和进步将有助于社会福利，减轻严重地震和长期风荷载造成的人员和经济损失，同时满足现有基础设施寿命和可持续性的要求。PSD的另一个优点是它仅由传统材料（砂和钢）沿着土木工程师最熟悉的后张技术组成。教育，推广和研究活动将创建初中和高中，本科和研究生，包括大学的夏令营的女孩。该项目产生的实验和模拟数据将在NSF支持的自然灾害工程研究基础设施（NHERI）数据库（https：//www.example.com）中公开提供。www.DesignSafe-CI.org该奖项有助于NSF在国家地震灾害减少计划（NEHRP）和国家风暴影响减少计划（NWIRP）中的作用。这项研究的最初贡献是开发和实验和数值验证一种创新的，低成本的，长冲程的，环保的，稳定的PSD，符合可持续工程的标准，而不会受到粘性加热的挑战。PSD中的能量耗散源于加压砂的剪切作用，该剪切作用利用砂的压力相关的剪切强度及其在循环运动期间对增加耗散能量的作用。本研究的具体目标是（a）对原型阻尼器的各种配置进行全面测试，以确定控制原型设计的物理相似性和比例律;（B）提供对砂阻尼器的内部压力的连续、实时监测和调节;（c）使用离散元件方法对PSD的砂流/行为进行数值建模，同时利用砂粒的可压碎模型，该方法经实验数据验证后，可用于各种规模和结构的砂阻尼器设计;和（d）改进最近开发的宏观，该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来提供支持。