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

本研究项目研究了预制SRC柱和组合钢梁的特殊弯矩框架（SMF）系统的抗震性能。建议的框架系统由预制的SRC柱树组成，与钢梁桩紧密连接。然后将组合钢梁的中心部分进行现场拼接。拼接位置是指定的耗能区域，其形式可以是常规的梁塑性铰接，也可以是一些机械耗能装置。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主要基于两个原因。首先，SRC柱与组合钢梁结构已被设计工程师接受用于低至中震区的高层建筑-柱钢形状既用于结构用途，也用于安装目的。其次，基于1994年Northridge地震期间钢制smf连接性能不佳，将塑性铰移离柱面是非常可取的。然而，在制定抗震设计指南之前，仍有几个问题有待解决和验证。这些包括具有强连接的SRC柱的抗震性能以及在柱的强轴或弱轴上的梁拼接弯曲。预测框架地震反应的能力也有待建立。该项目的工作包括根据1994年UBC或NEHRP地震规定设计一座12层的原型建筑，其周长为复合smf。两个全尺寸的组件，分别包括外部和内部的梁柱连接，将以准静态的方式进行循环测试。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“复合和混合结构”下的第二个奖项。

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.`