Research on Rational Design of Prestressed Concrete Structures

本研究的目的是从力学的角度评价预应力混凝土构件的抗剪机理，为预应力混凝土构件的抗剪破坏提供足够的安全性。为了达到这一目的，在2005至2006年间进行了实验和数值研究。主要研究成果如下：2005年，对预应力混凝土构件的抗剪性能进行了试验研究和数值分析。在世界各地收集了各种实验数据。这些数据被用来评估简化桁架模型的准确性和有效性。并进行了参数数值分析，建立了PC剪力配筋构件的简化桁架模型。2006年，进行了体外预应力混凝土梁和节段式体外拉索预应力混凝土梁的试验研究。为了检验简化桁架模型的准确性和有效性，进行了这些实验。通过试验和数值试验，证实简化桁架模型可以用来评估PC构件的抗剪机理，也可以用来预测PC构件的抗剪能力。这项研究的成果已发表在JSCE《材料、混凝土结构与路面》杂志和《日本混凝土学会会刊》等多个期刊上。

The purpose of this research is to evaluate the shear resisting mechanism of prestressed concrete (PC) structural members based on the mechanical consideration and to provide the adequate safety against the shear failure of PC structural members. To achieve this purpose, experimental and numerical investigations have been done during 2005 and 2006. Obtained results are as follows :In 2005, experiments and numerical analyses were carried out to evaluate the shear resisting mechanism of PC members. Various experimental data were collected throughout the world. These data were used to evaluate the accuracy and validity of the simplified truss model. Parametric numerical analyses were also performed to formulate the simplified truss model for PC structural members with shear reinforcement. Finally, the simplified truss model to explain the shear resisting mechanism of PC members has been proposed.In 2006, the experiments of externally prestressed concrete beams and also segmental PC beams with external cables were performed. These experiments have been done to examine the accuracy and validity of the simplified truss model. From the experimental and numerical examinations, it has been confirmed that the simplified truss model can be adopted to evaluate the shear resisting mechanism and also to predict the shear resisting capacity of PC members.The obtained results of this research have been published in various journals, such as JSCE Journal of Material, Concrete Structures and Pavements, and the Proceeding of Japan Concrete Institutes, etc.