Behavior of SRC Column-Composite Steel Beam Connections Subjected to Seismic Loading

9520295 Wright本研究项目将研究组合（钢-混凝土）结构中外部框架连接的地震响应。 连接将包括一个钢筋混凝土（SRC）柱和一个组合梁（钢梁和混凝土板）。 横向钢梁、钢桥面板和楼板都将是测试的一部分，以更接近地模拟复合连接，因为它们将在现场建造。 主要的实验变量将是SRC柱和组合梁之间的弯矩强度比，以及连接子组件的接头区域中SRC柱中使用的约束钢筋的类型。 在接缝周边内，箍筋需要由多达四块组成，当它们穿过钢梁腹板时，搭接拼接。 对于某些试件，将在连接区域使用纤维增强混凝土（FRC），以增强沿着拼接长度的粘结。 FRC将为连接处的混凝土增加一些内部约束，并应减缓连接处混凝土剪切机制的恶化。 测试后分析研究将用于模拟测量的连接行为，并帮助开发可用于进一步参数研究的分析模型。 分析建模将与先前和当前的美国研究项目相协调，这些研究项目涉及对复合材料框架结构的动态响应进行建模。 这是一个在民用基础设施系统（CIS）的第一年计划下支持的项目，招标NSF 94-154。 ***

9520295 Wright This research project will investigate the seismic response of exterior frame connections in composite (steel-concrete) structures. The connections will consist of a steel-reinforced concrete (SRC) column and a composite beam (steel beam and concrete slab). Transverse steel beams, steel decking and a floor slab will all be part of the test subassemblies to more closely simulate composite connections as they would be constructed in the field. The primary experimental variables will be the moment strength ratio between the SRC column and the composite beam, and the type of confinement reinforcement used in the SRC column in the joint region of the connection subassembly. Within the joint perimeter hoop reinforcement will need to be composed of as many as four pieces that are lap spliced as they pass through the steel beam webs. For some of the specimens a fiber reinforced concrete (FRC) will be used in the connection region to enhance the bond along the splice lengths. The FRC will add some internal confinement to the concrete in the connection and should slow the deterioration of the concrete shear mechanisms in the connection. Post test analytical studies will be used to simulate the measured connection behavior and to help develop an analytical model that could be used for further parametric studies. The analytical modeling will be coordinated with prior and current U.S. research projects concerned with modeling the dynamic response of composite frame structures. This is a project supported under the year 1 program of the Civil Infrastructure Systems (CIS), solicitation NSF 94-154. ***