Dynamic Response of Diaphragms

在美国和世界上，砖石结构占建筑结构的很大一部分。加筋砌体以其经济、防火、建筑灵活、施工方便等明显的特点，在中、高震区的应用越来越多。砌体结构分析和设计、材料和施工技术的现状不能准确预测建筑在侧向荷载（如地震荷载）下的性能。在美国，砌体建筑的设计和建造方法、规范和标准依赖于工作应力方法、经验规则和确定允许应力值的可疑方法的混合。砌体也是一种复杂的建筑材料，因为大量的设计和施工变量会影响最终产品的结构及其在地震荷载下的反应。为了描述砌体建筑的地震反应，有必要建立基本的知识库，以确定符合安全和经济要求的基本设计方法。本课题主要研究用于建筑物动力分析的集总质量参数楼板弹簧系统模型。这包括水平楼板系统的滞回模型，该系统由组合钢-甲板加固板和混凝土空心核心预制板组成。本研究发展了水平楼板系统荷载位移历史的解析非线性模型，为综合动力弹簧模型提供相关的位移和刚度。它提供了一个计算机模型，使用从其他砌体研究人员收集的实验数据。该项目是美日砌体建筑研究协调计划和砌体研究技术协调委员会计划的一部分。

Masonry construction comprises a large portion of building construction in the U. S. and the world. Reinforced masonry construction use is increasing in moderate to higher seismic zones because of its apparent features of economy, fire safety, architectural flexibility and ease of construction. The present state of masonry structural analysis and design, and materials and construction technologies does not enable an accurate prediction of building behavior under lateral loads such as seismic loads. In the U.S., masonry buildings are designed and built with methods, codes and standards that rely upon a mixture of working stress methods, empirical rules, and questionable methods for determining allowable stress values. Masonry is also a complex building material because of the large number of design and construction variables which influence the final product configuration and its response under seismic loads. In order to describe the seismic response of masonry buildings it is necessary to develop the fundamental knowledge base to determine basic design methodologies consistent with safety and economic requirements. This research project concentrates on a lumped mass parameter floor slab spring system model to be used for dynamic analysis of buildings. This includes hysteretic modeling for horizontal floor systems consisting of composite steel-deck-reinforced slabs and concrete hollow-core precast plank slabs. This research develops an analytical non-linear model of load- displacement history of horizontal floor systems to provide associated displacements and stiffnesses for an integrated dynamic spring model. It provides a computer model using experimental data collected from other masonry researchers. This project is part of the U.S.-Japan Coordinated Program for Masonry Building Research and the Technical Coordinating Committee for Masonry Research (TCCMAR) Program.