PRESSS Phase III: Five-story Precast Superassemblage Test

本项目涵盖了模拟地震荷载下大型五层预制超级组合的施工和测试。该项目的目的是提供一个现实的工具来验证结构概念、设计方法和分析程序在NSF研究倡议“预制和预应力地震结构系统”（PRESSS）第1阶段和第11阶段中开发的，并在减少损伤和残余变形方面评估预制设计与传统加固建筑相比的抗震性能。该项目是PRESSS第三期的关键要素，按照PRESSS最初的总体规划。该建筑将由五层楼组成，采用两湾乘两湾的规划。在一个方向上，侧支撑将由预制墙提供，在另一个方向上，由预制框架提供，使不同的结构系统能够在正交方向上进行测试。不同的楼层将采用不同的预制楼板系统，以研究隔膜作用和框架-楼板连接细节。设计将按照PRESSS早期阶段制定的直接位移地震设计程序进行。测试将主要在先前为五层砖石建筑开发的多自由度伪动力测试程序下进行。选择连续的时间历史来将建筑物锻炼到一系列极限状态，包括(1)首次开裂，(2)首次屈服，(3)使用极限，(4)损害控制，(5)早期倒塌，将应用于结构。实验结果将用于最终确定PRESSS项目的设计建议。五层超级组装试验具有极强的行业支持，60%以上的必要成本由预制行业提供。

This project covers the construction and testing of a large scale five-story precast superassemblage under simulated seismic loading. The purpose of the project is to provide a realistic vehicle for verifying structural concepts, design methodology and analytical procedures developed in NSF research initiative `precast and prestresses seismic structural systems` (PRESSS) Phases 1 and 11, and to evaluate the seismic performance of precast designs in terms of reduced damage and residual deformation compared with conventionally reinforced buildings. The project forms the key element of PRESSS Phase III, in accordance with the original PRESSS master plan. The structure will consist of five stories, with a two-bay by two-bay plan. In one direction the lateral bracing will be provided by precast walls, and in the other direction, by precast frames, enabling different structural systems to be tested in orthogonal directions. Different precast flooring systems will be adopted at different levels to investigate diaphragm action and frame-floor connection details. Design will be in accordance with direct-displacement seismic design procedures developed as part of the earlier PRESSS phases. Testing will primarily be under a multi-degree-of-freedom pseudo-dynamic testing procedure developed earlier for a five-story masonry building. Sequential time-histories chosen to exercise the building to a series of limit states including (1) first-cracking, (2) first yield, (3) serviceability limit, (4) damage control, and (5) incipient collapse, will be applied to the structure. Results from the experiment will be used to finalize design recommendations from the PRESSS project. The five-story superassemblage test has extremely strong industry support, with more than 60% of the necessary cost being provided by the precast industry.