Reliability Estimation and Limit State Design of Hybrid Structures

近年来，由于合理利用材料的力学性能(即混凝土用于压缩，钢和纤维用于拉伸)，许多国家设计和建造了由混凝土、钢、玻璃钢等不同材料组成的混合结构。然而，在日本，由于混凝土和钢结构都是按照各自不同的设计规范进行设计的，因此还没有制定出适用于混合结构的设计规范。该项目的目的是提出基于可靠性的设计格式，具有适用性、极限状态和疲劳状态极限。为此，来自不同研究领域的15名项目成员进行了合作研究。小组成员通过实验和理论分析研究了下列主题，并讨论了制定极限状态设计规范的常见问题。高强度玻璃钢在恶劣环境下的耐久性试验及其在工程结构中的应用。2.型钢混凝土结构极限状态设计方法和荷载系数及构件极限强度试验结果。3.混合斜拉桥的静力和动力特性及其设计形式。4.钢与混凝土连接处栓钉剪力连接件的变形特性和强度。5.基于极限状态设计的预应力混凝土斜拉桥可靠度校核。6.修复后钢筋混凝土构件的拟动力试验。7.组合梁桥的可靠度估算及其设计荷载系数。

Recently hybrid structures which consist of different materials such as concrete, Steel, FRP, etc. have been designed and constructed in many countries, because of reasonable use of mechanical properties of materials (i.e., concret for compression, and steel and fibers for tension). However, in Japan, appropriate design codes for hybrid structures have not been developed yet, because concrete and steel structures have been designed with their own design codes which have different design formats. The purpose of this project is to propose reliability based design formats with serviceability, ultimate and fatigue state limits. For this purpose, 15 members of this project from different fields of study made the co-operateve research. The following topics with experimental and theoretical analyses have been investigated by small groups of members, and common problems for development of the limit state design codes are discussed by all members.1. Testing of durability of high strength FRP in severe environment and its application to engineering structures. 2. Limit state design method and load factors of steel reinforced concrete buildings with experimental results of ultimate strength of structural members. 3. Static and dynamic characteristics of hybrid cable-stayed bridges and their design formats. 4. Deformation characteristics and strength of stud shear connectors at the joints between steel and concrete members. 5. Calibration of reliability of prestressed concrete cable-stayed bridges with limit state design. 6. Pseudo-dynamic tests of repaired reinforced concrete members. 7. Reliability estimation of composite girder bridges and their design load factors.