開口部を有するプレストレストコンクリート部材の断面設計に関する研究 : その1.曲げ材の許容応力度設計

概要

論文の詳細を見る
In design practice, the demand to provide web openings in prestressed concrete beams is increasing. However, so far an efficient design method has not been proposed. In order to design openings in beams safely, it is required first to know the elastic stress states, strengths and deformations at the openings, and then to establish reinforcing details around the openings. The target is to establish a design method, which provides guidelines so that the beams with openings to be designed, do not fail at the openings and have a performance equivalent to the beams without openings. It is common that the sectional design of prestressed concrete members are carried out on the basis of both allowable stress and ultimate strength design methods. In the present paper, the authors propose the sectional design method for prestressed concrete members with web opening at the center of the span, and describe it by applying it to practical design examples. The objective of the present design method is to find out the fiber stresses of prestressed concrete beams simply but accurately. First, axial stresses induced by prestressing forces, and flexural stresses induced by prestressing and external forces are separately calculated by the finite element method. In the next phase, the ratios of these stresses to the axial and flexural stresses calculated by the elementary beam theory, which considers the effect of axial forces, are evaluated. Finally, the fiber stress of prestressed concrete beams with openings is ev- aluated by multiplying these ratios to the design formula based upon the beam theory. For the convenience of design practice, a diagram to obtain the fiber stress is illustrated. The variational parameters stated in the above analysis are the shapes of openings (rectangular or circular), the ratio of depth of openings to depth of beam, and the ratio of width to depth of openings, etc.
社団法人日本建築学会の論文
1990-03-25

開口部を有するプレストレストコンクリート部材の断面設計に関する研究 : その1.曲げ材の許容応力度設計

スポンサーリンク

概要

著者

関連論文

スポンサーリンク