Establishment of Analytical Methodology for Mechanical,Characteristics of Steel-Concrete Hybrid Structures

(1)编制了钢梁与钢筋混凝土桥墩刚性连接的混合结构受力分析程序。在程序中，混凝土被假定为均匀材料，并采用莫尔-库仑破坏准则考虑应变软化。为了严格处理混凝土与钢筋或钢板之间的粘结现象，粘结单元被开发的基础上提出的模型，并纳入程序。特别是混凝土与钢板之间的粘结单元可以表达滑移和剥离现象。所开发的程序可应用于一般的复合材料结构。(2)分析与实验结果的比较表明，所开发的程序可以准确地跟踪行为的大变形区域。(3)对实际比例混合结构的分析表明，若不采取特殊措施，上部结构的荷载大部分传递到连接处及其附近，几乎不发生侧向分布。(4)在此基础上，建立了压杆-拉杆模型，该模型能更简单地分析结构的受力性能，并可作为结构设计的工具。

(1) A FEM program was developed to analyze the mechanical behavior of hybrid structures in which steel girders are rigidly connected to RC pier. In this program, concrete was assumed as homogeneous material, and Mohr-Coulomb's failure criterion was adopted considering strain softening. In order to treat bonding phenomena between concrete and reinforcing bar or steel plate rigorously, bonding elements were developed based on the previously proposed models and incorporated into the program. In particular, the bonding element between concrete and steel plate can express slip and exfoliation phenomena. The developed program can be applied to composite structures in general.(2) Comparison of analysis with experimental results showed that the developed program can trace the behavior accurately up to large deformation region.(3) Analysis on the hybrid structures of actual scale showed that, unless some special measures are taken, most of the load from super structure is transferred to the connection and its vicinity, hardly distributing to the lateral direction.(4) A strut and tie model, which can analyze the behavior more simply and can be used as design tool, was developed based on the analysis.