Development of Rational Design Method of Steel-Concrete Sandwich Structures

在本研究中，试图开发一种合理的设计方法，考虑混凝土与普通结构的差异。研究结果总结如下:(1)在试验和有限元分析的基础上，阐明了全夹层和开口夹层线形构件的抗剪机理，建立了其抗剪强度评估模型。(2)阐明了开口夹层板的开裂行为、扭转强度和刚度。(3)通过试验与有限元分析相结合，明确了夹层线形构件受剪切疲劳的破坏模式，确定了剪切疲劳破坏的计算方法。(4)通过数值分析和实验分析，提出了压缩蒙皮板屈曲强度和后屈曲强度的计算方法。(5)对带压花和开口的蒙皮板与混凝土的粘结进行了试验和数值分析，明确了蒙皮板与混凝土的粘结滑移特性和粘结强度。(6)对角节点的强度进行了实验澄清，明确了有限元分析可以预测实验结果。(7)通过施工试验，明确了实际夹层结构中气孔的最大尺寸。通过对具有最大空隙的夹层梁进行加载试验，明确了夹层梁的强度降低程度。(8)通过对混凝土压实性进行简单试验，提出了一种避免空穴的施工体系。(9)通过对夹层结构在浮动结构中的适用性研究，提出了有待解决的问题。

In this research it was attempted to develop a rational design method considering the difference in concreting from ordinary structures. The research results are summarized as follows.(1) Based on the experiment and the finite element analysis, the shear resisting mechanisms of the full and open sandwich linear members has been clarified and models for evaluation of their shear strengths are developed.(2) The cracking behavior, strength and stiffness in torsion of the open sandwich plate are clarified.(3) Conduction both the experiment and finite element analysis, the failure modes of the sandwich linear members subject of shear fatigue have been clarified and the calculation method for the shear fatigue failure.(4) Calculation methods for the buckling strength and the post-buckling strength of the compression skin plate are proposed by conducting the numerical and experimental analyzes.(5) Conducting the experiment and the numerical analyzes on the bond between skin plate and concrete in the cases of the skin plate with embossment and openings, the bond-slip characteristics as well as the bond strengths are clarified.(6) The strength of the corner connections has been experimentally clarified and it is clarified that the finite element analysis can predict the experimental results.(7) The maximum size of air voids in an actual sandwich structure is clarified by conducting the experiment of the construction. The degree of the strength reduction is clarified by the loading test of the sandwich beams with the air void of the maximum size.(8) A construction system to avoid air voids is proposed by conducting simple tests for concrete compactability.(9) After investigating the applicability of the sandwich structures to floating structures, the items to be solved are presented.