Three-Dimensional Slab Effects in Partially-Restrained Composite Connections

9710238 Leon该项目旨在开发实验数据和分析工具，以更好地表征典型组合楼板系统中的三维效应和钢-混凝土相互作用。 如钢框架与组合楼板，很少知道这些系统的极限承载力，延性和韧性。 从基本观点来看，需要研究来回答以下问题： o外部连接在循环荷载反复作用下的性能。 o柱弱轴连接框架的性能 当受到循环载荷时。 o横向和重力作用之间的相互作用， 系统的强度和刚度。 o楼板对端部扭转约束的影响 复合材料梁。 o剪力连接程度对强度的影响 和系统在横向载荷下的刚度。 o板钢筋详图对力的影响 转移 o剪力钉在反向循环荷载下的性能。 结合先进分析技术的实验将用于解决上述几个主题。 实验将包括一些独特的双向加载测试的新型部分约束复合材料（PR-CC）连接，利用T型短柱和加劲座椅。 其中，柱弱轴连接、楼板边缘连接和剪力钉在反复荷载作用下的性能是研究的重点。 分析部分将开发新的元素，能够有效地模拟复合作用下的循环负荷逆转。 实验数据和简化模型的基础上的组件方法将开发T型短柱。 这些连接模型，沿着考虑复合作用而开发的单元，将用于参数研究，以定义具有各种PR-CC连接的结构的规范类型设计规则。 ***

9710238 Leon This project intends to develop experimental data and analytical tools to better characterize the three-dimensional effects and steel-concrete interaction in typical composite floor systems. Such as steel moment frames with composite floors for which very little is known about the ultimate strength capacity, ductility and toughness of these systems. From a fundamental standpoint research is needed to answer the following questions: o Behavior of exterior connections under cyclic load reversals. o Behavior of connections framing into the weak axis of columns when subjected to cyclic loads. o Interaction between lateral and gravity actions insofar as system strength and stiffness are concerned. o Effect of the floor slab on the torsional restraint at the end of composite beams. o Influence of the degree of shear connection on the strength and stiffness of the system under lateral loads. o Influence of the slab reinforcement detailing on the force transfer. o Behavior of shear studs under reversed cyclic loading. Experiments coupled with advanced analysis techniques will be used to address several of the topics described above. The experiments will include some unique bi-directional loading tests on a new type of partially-restrained composite (PR-CC) connections utilizing T-stubs and stiffened seats. Among the key items to be studies are the connections to the weak axis of the columns, connections at the edge of the floor slabs, and behavior of shear studs under reversed cyclic loads. The analytical component will develop new elements capable of efficiently modeling composite action under cyclic load reversals. Experimental data and simplified models based on the component method will be developed for T-stubs. These connection models, along with the elements developed to take into account composite action, will be used in parametric studies to define code-type design rules for structures with a wid e variety of PR-CC connections. ***