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

钢和混凝土组合基础设施和建筑是抗震设计的理想选择，因为它们经济地提供了在不利荷载条件下确保良好性能所需的强度和刚度。然而，复合作用需要钢和混凝土之间的剪切传递。根据构件在结构中的位置，传递要求变化很大。这种通过滑移传递的损失可能会导致强度和刚度的巨大损失，而能量耗散很小。剪切连接件可用于在元件之间传递剪切力，但它们价格昂贵，工程师们的动机是尽量减少它们的使用。目前，在美国的实践中，没有指导方针或规范规定来帮助他们确定最佳剪切连接器的放置位置。这项研究将为在保证良好的抗震性能的同时，建立最经济的钢筋混凝土（SRC）和钢管混凝土（CFT）结构的剪切连接件要求提供设计指南。该项目将包括对现有测试数据的全面审查，以确定各种CFT和SRC应用程序可以开发的剪切能力。将进行一系列的实验来填补现有知识和数据的空白。蠕变、收缩和泊松效应的研究表明，使用粘结或粘附作为剪切传递机制存在潜在问题，并将进行实验。实验将建立一个更完整的CFT和SRC应用的粘结应力和剪切传递能力的图片。基于为本研究项目建立的主题结构，将分析一系列SRC和CFT原型结构，以确定确保令人满意的抗震性能所需的剪切传递需求。剪切传递能力将与开发设计指南和建议的需求相关。这是一个由土木基础设施系统（CIS）的第一年项目支持的项目，招标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. ***