再生骨料混凝土结构抗震设计关键问题

随着砂石骨料日益短缺、价格上涨，以及国家对生态环保事业的日益重视，在结构工程中使用再生骨料混凝土(简称为“再生混凝土”)的时机已经基本成熟。然而，在实际工程应用中，结构设计人员对再生混凝土结构设计关键参数的选取方法不明确，大多沿用普通混凝土结构的设计参数，这给再生混凝土结构的应用埋下了安全隐患。文章基于将再生混凝土应用于上海12层框架 剪力墙结构设计中遇到的诸多问题及解决方法，结合近年来对再生混凝土结构抗震性能的试验研究和现场监测结果进行深入分析和讨论，旨在提出安全、可靠的再生混凝土结构设计及非线性分析过程中的关键参数，包括力学参数、本构模型、阻尼比参数等输入参数，以及轴压比限值和层间位移角限值等控制指标，并讨论了设计软件的选取，为推广再生混凝土结构抗震设计技术提供理论和实践依据。

Key problems for seismic design of recycled aggregate concrete structures

Due to the lack of natural resources and more efforts on environment protection, the application of recycled aggregate concrete in practical engineering is becoming possible and practical nowadays. However, due to the limited knowledge of the key parameters for seismic design of the recycled aggregate concrete structures, the structural engineers generally apply the parameters of natural aggregate concrete structures in the design of recycled aggregate concrete structures, resulting in safety problems in the real engineering projects. Based on the design experience of a 12-story recycled aggregate concrete frame shear wall structure in Shanghai, and the latest lab and field research achievements on the seismic performance of the recycled aggregate concrete structures, the key parameters in the seismic design are proposed, such as the material properties, constitutive model and damping ratio, the control indexes, the axial compression ratio and the interstory drift limitation. Finally, some design softwares for the seismic design of recycled aggregate concrete structures are introduced and compared. The research results can lay good foundation for the design theory and practice of recycled aggregate concrete structures.