RC/Composite Wall - Steel Frame Hybrid Buildings:Connectionsand System

由钢筋混凝土墙/核心筒和混凝土重力式框架组成的结构体系是在地震高危地区进行中等高耸建筑时非常常见的结构体系。钢筋混凝土或组合核心墙和钢重力框架或弯矩框架的使用为钢筋混凝土墙/核心层和混凝土框架体系提供了一种经济的替代方案。对于钢和混凝土之间的受力传递机理，已进行了有限的研究。然而，与组合墙/核心层(有钢边界柱的)和框架-核心层连接的循环性能有关的基本问题尚未得到解决。将进行一个综合的试验和分析程序，以研究带有墙/芯(常规加固或钢边界元件)和钢重力或弯矩框架的体系的性能。该项目的主要目标是：(1)进行钢梁/楼板体系-核心层连接的试验研究，(2)开发此类连接的分析建模技术，(3)将这些模型纳入广泛使用的非弹性结构分析计算机程序，(4)提供工具来研究分析完整的建筑系统，以评估使用混合/组合体系的经济性，以及(5)制定设计准则。这项研究将围绕一个原型结构进行，该原型结构将被用来得出测试样本，并将实验数据与整体结构响应联系起来。建议的研究包括7个1/3比例的墙-钢边界柱(可以是小的架设柱或更大的)的试验测试，(2)连接区域周围的横向配筋量，(3)组合金属桥面板对连接节点，特别是‘纯剪切’节点的刚度和强度的贡献，以及(4)梁轴向荷载(由于组合金属桥面横隔板的作用而产生的拉或压)对剪力和弯矩连接性能的影响。将对试件的性能进行一般分析研究，以评估简化的代码方程预测组件强度的能力。还将使用根据平衡和兼容性要求构建的简化力学模型和有限元模型进行详细的分析研究。这些研究将有助于理解观察到的样品行为，以及研究在研究的实验阶段没有考虑的其他样品配置。将制定连接设计的具体建议。

Structural systems consisting of reinforced concrete walls/cores and concrete gravity frames are a very common structural system for moderate rise construction in regions of high seismic risk. Use of reinforced concrete or composite core walls and a steel gravity or moment frame offers an economical alternative to RC wall/core and concrete frame systems. Limited studies have been conducted to examine bearing force transfer mechanism between steel and concrete. However, fundamental issues related to cyclic performance of composite walls/cores (those with steel boundary columns) and frame-core connections are yet to be addressed. An integrated experimental and analytical program will be carried out to investigate the performance of systems with walls/cores (conventionally reinforced or with steel boundary elements) and steel gravity or moment frames. The primary objectives of this project are to: (1) conduct experimental studies of steel beam/floor system-to-core connections, (2) develop analytical modeling techniques for such connections, (3) incorporate these models into widely used inelastic structural analysis computer programs, (4) provide tools to investigate analytically complete building systems to assess the economics of using hybrid/composite systems, and (5) develop design guidelines. The research will revolve around a prototype structure which will be used to derive the test specimens, and to relate experimental data to overall structural response. The proposed research involves experimental testing of seven 1/3 -scale wall-to steel boundary columns (which may be a small erection column or a larger one), (2) amount of transverse reinforcement around the connection region, (3) contribution of composite metal decks to the stiffness and strength of the connections, particularly `shear-only` connections, and (4) the influence of beam axial load (tension or compression due to composite metal deck diaphragm action) on the performance of shear and moment connections. General analytical studies of specimen behavior will be conducted to evaluate the ability of simplified code equations to predict the strength of the subassemblages. Detailed analytical studies will also be conducted by using simplified mechanical models constructed based on equilibrium and compatibility requirements, and finite element models. These studies will assist in understanding observed specimen behavior, as well as to study additional specimen configurations not considered in the experimental phase of the research. Specific recommendations for connection design will be developed.