Response of Reinforced Masonry Building Systems

在美国和世界范围内，砖石建筑占建筑建筑的很大一部分。由于配筋砌体结构具有明显的经济性、防火安全性、建筑灵活性和施工简便性等特点，在中高地震区的应用日益广泛。目前的砌体结构分析和设计，以及材料和施工技术，无法准确预测建筑物在水平荷载(如地震荷载)下的行为。在美国，砖石建筑的设计和建造方法、规范和标准依赖于工作应力方法、经验规则和确定许用应力值的可疑方法的混合。砌体也是一种复杂的建筑材料，其设计和施工变量众多，影响最终产品的构型及其在地震荷载作用下的反应。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。本研究项目将研究一个已知力-挠度滞回的配筋砖房体系的动力响应。它将集中于钢筋混凝土砌体结构软化与破坏性地震运动序列之间的相互依存关系。三个相同的试验结构将以四分之一的比例制造，并受到静力和动侧向力。将使用数值程序来帮助解释测量结果。本研究项目的结果将被用来评估缩尺模型在预测全尺寸配筋砌体结构性能方面的应用，并与以前的全尺寸研究结果进行比较。这将对设计实践产生影响。首席调查员非常有资格进行这项工作，而且该机构提供了极好的支持设施。建议为这项为期两年的完整研究项目的第一年颁发奖项。

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 influenoe 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 will investigate the dynamic response of a reinforced masonry building system with a known force-deflection hysteresis. It will focus on the interdependence of the softening of reinforced concrete masonry structures and the sequence of destructive earthquake motions. Three identical test structures will be fabricated at one-quarter scale, and subjected to static and dynamic lateral forces. Numerical procedures will be used to help interpret measurements. The results of this research project will be used to assess the use of scale models for predicting the behavior of full scale reinforced masonry structures by making comparisons with previous full scale research results. This will influence the design practice. The principal investigator is highly qualified to conduct the work and the institution provides excellent support facilities. An award is recommended for the first year of this two-year complete research project.