Seismic Performance of Composite SMFs with Precast SRC Columns, Strong Connections, and Steel Beams

本研究旨在探讨预制型钢混凝土柱与组合钢梁组成的特殊弯矩框架（SMF）体系的抗震性能。 建议的框架系统是由预制SRC柱树与钢梁短柱的强连接。 然后现场拼接组合钢梁的中心部分。 拼接位置是指定的耗能区域，其可以是常规梁塑性铰的形式或一些机械耗能装置的形式。 选择这种类型的复合框架系统及其在美国系统中广泛使用的潜力基于两个主要原因。 首先，SRC柱与组合钢梁结构已被设计工程师接受，用于低到中等地震区的高层建筑-柱型钢用于结构使用以及用于安装目的。 其次，基于1994年北岭地震中钢结构SMF中连接的不良性能，非常希望将塑性铰从柱面移开。 然而，在制定抗震设计准则之前，仍有几个问题有待解决和验证。 其中包括强连接型钢混凝土柱的抗震性能和梁拼接弯曲的强或弱轴的柱。 预测框架地震响应的能力也有待建立。 本项目下的工作包括根据1994 UBC或NEHRP抗震规定设计一座12层原型建筑，周边为复合材料SMF。 两个全尺寸的节点，包括外部和内部梁柱节点，将分别以准静态方式进行循环试验。 还将对试验模型的地震反应进行分析研究。 这是第94-154号倡议“复合材料和混合结构”下的第二年奖项。

This research project addresses seismic performance of a special moment frame (SMF) system with precast SRC columns and composite steel beams. The proposed framing system is composed of precast SRC column trees with strong connection to steel beam stubs. The center portion of the composite steel beam is then field spliced. The spliced location is the designated energy dissipative region, which can be in the form of either conventional beam plastic hinging or some mechanical energy dissipation devices. The selection of this type of composite framing system and their potential for popular use in the United States system are based on two main reasons. First, SRC columns with composite steel beam construction has been accepted by design engineers for tall buildings in low to moderate seismic regions-column steel shape is for structural use as well as for erection purposes. Second, based on the poor performance of connections in steel SMFs during the 1994 Northridge earthquake, it is highly desirable to move the plastic hinge away from the column face. Several issues remain to be resolved and verified, however, before seismic design guidelines can be developed. These include the seismic performance of SRC columns with strong connections and beam spliced bending in the strong or weak axis of the column. The ability to predict the frame's seismic response also remains to be established. The work under this project includes the design, per 1994 UBC or NEHRP Seismic Provisions of a 12-story prototype building with perimeter composite SMFs. Two full-scale subassemblies, including exterior and interior beam-to-column joints, respectively, will be tested cyclically in a quasistatic manner. Analytical studies of the seismic response of test models will also be conducted. This is a 2nd-year award under the No. 94-154 initiative `Composite and Hybrid Structures.`