Design Requirements for Shear Connectors in Encased Steel (SRC) and Concrete Filled Tube (CFT) Construction

9520233罗德组合钢和混凝土基础设施和建筑是抗震设计的理想之选，因为它们经济地提供了所需的强度和刚度，以确保在恶劣载荷条件下具有良好的性能。然而，组合作用需要钢筋和混凝土之间的剪力传递。转移要求根据部件在结构中的位置而变化很大。这种通过滑移传递的损失可能会导致强度和刚度的急剧损失，而能量消耗非常小。剪切连接件可以用来在构件之间传递剪力，但它们的成本很高，工程师们积极地将它们的使用降到最低。目前，在美国的实践中，没有指南或规范条款来帮助他们确定最佳的剪力连接件位置。这项研究将为在外包钢(SRC)和钢管混凝土(CFT)结构中建立最经济的剪力连接件要求提供设计指南，同时确保良好的抗震性能。该项目将包括对现有试验数据的全面审查，以确定可用于各种CFT和SRC应用的抗剪能力。将进行一系列实验，以填补现有知识和数据的空白。对蠕变、收缩和泊松效应的研究表明，在使用粘结或粘结作为剪切传递机制时存在潜在问题，并将进行实验。试验将为钢管混凝土和型钢混凝土的粘结应力和剪切传递能力建立一个更完整的图景。将分析一系列基于本研究项目主题结构的型钢混凝土和钢管混凝土原型结构，以确定确保满意的抗震性能所需的剪力传递需求。剪切传递能力将与制定设计指南和建议的需求相关。这是一个由民用基础设施系统(CIS)第1年计划支持的项目，征集NSF 94-154。***

9520233 Roeder Composite steel and concrete infrastructures and buildings are desirable for seismic design, because they economically provide both the strength and stiffness needed to assure good performance under adverse loading conditions. However, composite action requires a shear transfer between the steel and the concrete. The transfer requirements are highly variable depending upon the location of the component in the structure. Los of this transfer through slip may result in a dramatic loss of strength and stiffness with very little energy dissipation. Shear connectors may be used to transfer shear force between elements but they are costly, and engineers are motivated to minimize their use. At present, there are no guidelines or specification provisions to help them determine the best shear connector placement in US practice. This research will provide design guidelines for establishing the most economical shear connector requirements in both encased steel (SRC) and concrete filled tube (CFT) construction, while assuring good seismic performance. This project will consist of a thorough review of existing test data to determine the shear capacity that can be developed with various CFT and SRC applications. A series of experiments will be performed to fill gaps in existing knowledge and data. Studies on creep, shrinkage and the Poisson effect represent potential problems in using bond or adhesion for the shear transfer mechanism, and experiments will be performed. The experiments will establish a more complete picture of bond stress and shear transfer capacity for both CFT and SRC applications. A range of SRC and CFT prototype structures based on the Theme Structures established for this research project will be analyzed to determine the shear transfer demand necessary to assure satisfactory seismic performance. The shear transfer capabilities will be correlated to the demand to develop design guidelines and recommendati ons. This is a project supported under the year 1 program of the Civil Infrastructure Systems (CIS), solicitation NSF 94-154. ***