PRESSS Phase III: Five-story Precast Superassemblage Test

该项目包括在模拟地震荷载下建造和测试大型五层预制超级装配体。 该项目的目的是提供一个现实的工具，验证结构概念，设计方法和分析程序开发的NSF研究计划“预制和预应力抗震结构系统”（PRESSS）第1和第11阶段，并评估抗震性能的预制设计减少损坏和残余变形相比，传统的加固建筑。 根据PRESSS最初的总体规划，该项目构成PRESSS第三阶段的关键要素。 该结构将包括五层，两个海湾由两个海湾计划。 在一个方向上，横向支撑将由预制墙提供，在另一个方向上，由预制框架提供，从而能够在正交方向上测试不同的结构系统。 在不同的楼层采用不同的预制楼板系统，以研究横隔板作用和框架与楼板连接的细节。 设计应符合作为PRESSS早期阶段一部分而制定的直接位移抗震设计程序。 测试将主要是根据一个多自由度的伪动态测试程序开发的五层砌体建筑。 选择顺序时程，以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）正常使用极限，（4）损伤控制，和（5）初期倒塌，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。 五层超级装配测试有着极其强大的行业支持，超过60%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.