Hybrid Sliding-Rocking Bridges for Resilient Accelerated Bridge Construction

位于美国地震带的大量桥梁需要立即翻新或更换。已经研究了加速桥梁施工（ABC）技术，以便更快地完成这些改造/更换，即在几天内，而不是在几周或几个月内，以尽量减少由于桥梁运营中断而造成的社会经济影响。ABC技术的其他优点包括通过减少建筑排放来减少对环境的影响，提高安全性并减少旅行公众的交通延误，以及提高产品质量/耐用性。尽管有这些优点，但由于ABC技术的抗震性能存在不确定性，因此主要应用于低地震活动性地区。本研究将研究一种新系统的性能，称为混合滑动-摇摆（HSR）桥梁，它已经显示出结合施工速度和弹性（低损伤）抗震性能的潜力。本研究将提高对高铁桥梁系统动态响应特性的理解，并解决高铁桥梁缺乏设计程序以及缺乏方法和数据来量化这种系统在其寿命周期内的成本和收益的问题。高铁桥梁结合了摇晃系统的特点和滑动隔震的特性，为ABC提供了一个多功能的弹性地震系统。该研究将制定一个整体框架，将滑动/摇摆系统的基于力学的建模、主要设计变量的计算敏感性研究、实验验证和性能评估研究、基于性能的地震设计（PBSD）方法的开发以及生命周期效益-成本评估集成在一起。该框架将应用于高铁桥梁概念，以研究高铁桥梁的基本动力响应特性，量化各种设计变量对高铁桥梁抗震性能的影响，开发高铁桥梁的PBSD和生命周期评估方法，并量化高铁桥梁在其整个使用寿命内相对于传统桥梁的性能优势。本研究将通过综合实验和计算方法促进对滑动-摇摆系统的基本力学/动力学和地震反应的理解。该研究还将通过制定适用于建筑和桥梁建设新系统的PBSD和生命周期评估的新整体框架，推进新地震系统的设计和评估科学。

A large number of bridges located in seismic regions in the United States are in need of immediate retrofit or replacement. Accelerated Bridge Construction (ABC) techniques have been investigated to accomplish these retrofits/replacements more rapidly, that is, in days, rather than weeks or months, in order to minimize socio-economic impacts due to disruptions in bridge operation. Further advantages of ABC techniques include reduced environmental impact through reduction in construction emissions, improved safety and reduced traffic delays for the traveling public, and improved product quality/durability. Despite these advantages, ABC techniques have been mostly implemented in low seismicity areas because of uncertainties in their seismic performance. This research will study the performance of a new system, termed the hybrid sliding-rocking (HSR) bridge, which has shown the potential to combine construction rapidity with resilient (low damage) seismic performance. This research will improve understanding of the dynamic response properties of HSR bridge systems, and address the lack of design procedures for HSR bridges and the lack of methods and data to quantity the costs and benefits of such a system over its life span. HSR bridges combine the features of rocking systems with the attributes of sliding seismic isolation, providing a versatile resilient seismic system for ABC. This research will formulate a holistic framework that integrates mechanics-based modeling of sliding/rocking systems, computational sensitivity studies for major design variables, experimental validation and performance assessment studies, development of performance-based seismic design (PBSD) methodologies, and life-cycle benefit-cost evaluations. This framework will be applied to the HSR bridge concept to investigate the fundamental dynamic response properties of HSR bridges, quantify the effects of various design variables on the seismic performance of HSR bridges, develop a PBSD and life-cycle assessment methodology for HSR bridges, and quantify the performance benefits of HSR bridges over conventional bridges over their entire service life. This research will advance understanding of the fundamental mechanics/dynamics and seismic response of sliding-rocking systems through an integrated experimental and computational approach. This research will also advance the science of the design and evaluation of new seismic systems by formulating a new holistic framework for PBSD and life-cycle assessment that will be applicable to new systems in both building and bridge construction.