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High Performance FRC Energy Absorbing Joints for Precast Concrete Frames (PRESSS)

用于预制混凝土框架的高性能 FRC 吸能接头 (PRESSS)

基本信息

批准号：
9307843
负责人：
Antoine Naaman
金额：
$ 25.42万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1993
资助国家：
美国
起止时间：
1993-09-01 至 1997-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307843&HistoricalAwards=false
关键词：
Performance FRC Energy Absorbing Joints

项目摘要

9307843 Naaman This proposal aims at pursuing the development of a high energy absorbing joint for precast concrete structures in seismic zones. The joint is made from high performance fiber reinforced cement based composites (HPFRC) such as high fiber content fiber reinforced concrete and SIFCON (Slurry Infiltrated Fiber Concrete). The joint is designed to act as an energy dissipating connector between the beam and the column elements. The use of high fiber content in the matrix of the joint is meant to insure high ductility, increased energy absorption, reduced spalling, and superior shear resistance during load reversals. The immediate objective of the research is to understand the fundamental mechanisms that control the properties of the joint and its response under monotonic and cyclic loads. An experimental and an analytical programs are planned. In the experimental program, two types of tests are proposed. The first is designed to identify the bond shear stress versus slip characteristics of reinforcing bars embedded in HPFRC; the other is to clarify the response of these composites, under monotonic and cyclic shear loading, with and without dowel reinforcement. The analytical program aims at developing a model to predict the hysteretic moment rotation response of the joint using the constitutive properties of the two main component materials and their interface. This study should eventually lead to designing joints with optimized ductility and energy absorbing properties. ***

9307843 Naaman 该提案旨在开发用于地震区预制混凝土结构的高能量吸收接头。该接头由高性能纤维增强水泥基复合材料（HPFRC）制成，例如高纤维含量纤维增强混凝土和SIFCON（浆液渗透纤维混凝土）。该接头设计用作梁和柱元件之间的能量耗散连接器。在接头基体中使用高纤维含量是为了确保高延展性、增加能量吸收、减少剥落以及在负载反转期间具有优异的抗剪性能。研究的直接目标是了解控制接头特性及其在单调和循环载荷下响应的基本机制。计划进行实验和分析程序。在实验方案中，提出了两种类型的测试。第一个旨在确定嵌入 HPFRC 中的钢筋的粘结剪切应力与滑移特性；另一个目的是阐明这些复合材料在单调和循环剪切载荷下、有或没有销钉加固的情况下的响应。该分析程序旨在开发一个模型，利用两种主要成分材料及其界面的本构特性来预测接头的迟滞力矩旋转响应。这项研究最终应该导致设计出具有优化延展性和能量吸收特性的接头。 ***