Composite Interaction of Steel Frame Members and Reinforced Concrete Walls Under Seismic Loading

9810005 HAJJAR这个项目是一项计算/试验相结合的工作，重点是复合墙结构建筑体系中混凝土墙和钢框架构件之间的界面的抗震性能。这项工作的目标是开发全面的、非线性的、静态和动态的分析程序来模拟复合墙建筑结构，包括钢/混凝土界面的行为；并通过了解RC墙和钢框架之间的复合循环作用来实现更多的了解。组合结构墙系统提供了出色的强度和刚度，可以承受服务水平漂移和地震事件的极限力。研究的目的包括：建立钢筋混凝土组合墙体的有限元分析公式，通过试验对埋入混凝土板内的头螺栓和变形钢筋锚的组合抗剪强度和抗拉强度进行量化，以及验证和校准实际中使用的连接件在单调和循环荷载作用下的抗剪和轴力共同作用关系。建立三维非线性有限元模型，模拟钢/混凝土墙体界面的循环相互作用。将设计一系列试验来记录沿RC墙和周围钢框架之间的界面的循环作用。分析将以几何和材料上的非线性有限元公式为特色，为剪力连接件使用新的基于纤维的有限元，并为界面区域的混凝土使用适当的连续单元，与混凝土和钢的应力空间塑性公式保持一致。最终目标是为以下方面制定明确的准则：1)将钢-混凝土界面行为纳入组合墙体系的线性和非线性分析；以及2)详细说明钢框架-混凝土板连接，以实现理想的性能目标。该项目得到了NSF 94-154第四届竞赛的支持。***

9810005 Hajjar This project presents a combined computational/experimental effort focusing on the seismic behavior of the interface between concrete walls and steel frame members in composite wall structural building systems. The work targets the development of comprehensive, nonlinear, static and dynamic analysis procedures for modeling composite wall building structures, including the behavior of the steel/concrete interface; and achieving a more through understanding of the composite cyclic interaction between RC walls and steel framing. Composite structural wall systems provide excellent strength and stiffness to withstand both service level drift and ultimate forces from seismic events. The objectives of the research include the development of a finite element formulation for the seismic analysis of composite reinforced concrete walls with surrounding steel framing, the quantification through experimental testing of the combined cyclic shear and tensil strength of headed hear studs and deformed bar anchors embedded in concrete panels, and the verification and calibration of the shear and axil strength interaction relations under monotonic and cyclic loading for connectors used in practice used in practice. A three-dimensional, nonlinear finite element to model to simulate the cyclic interaction at the steel/concrete wall interface will be formulates. A series of experiments will be designed to document the cyclic interaction along the interface between RC walls and surrounding steel framing. The analyses will feature a geometrically and materially nonlinear finite element formulation, using a new fiber-based finite element for the shear connectors and appropriate continuum elements for the concrete in the interface region, align with stress-space plasticity formulations for both the concrete and steel. The ultimate goals is the development of clear guidelines for: 1) incorporating the steel-concrete interface behavior in both linear and nonlinea r analyses of composite wall systems; and 2) detailing the steel frame-concrete panel connection to achieve desirable performance goals. This project is supported under the fourth year competition of NSF 94-154. ***