| 種別 | Special Lecture |
| 主題 | Ductile Design Approach for Moment Resisting Reinforced Concrete Frames |
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| 筆頭著者 | R. PARK |
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| 巻 | 10 |
| 号 | 1 |
| 先頭ページ | 1 |
| 末尾ページ | 21 |
| 年度 | 1988 |
| 要旨 | INTRODUCTION In general it is uneconomical to design a building structure to respond in the elastic range to the greatest likely earthquake. Therefore the design seismic forces recommended by codes are generally much less than the elastic response inertia forces induced by a major earthquake. Hence the member of such structures should have sufficient ductility to enable the structure to survive without collapse. Ductility means the ability of a member to undergo several reversals of displacements in the inelastic range while maintaining a substantial portion of the initial strength. This paper outlines the ductile design approach for moment resisting reinforced concrete frames currently used in New Zealand and briefly discusses current research conducted to improve existing design procedures. CONCLUSIONS The emphasis in the seismic design of moment resisting reinforced concrete frames should be on good structural concepts and detailing. It is recognised that uncertainty exists regarding the selection of the mathematical model representing the behaviour of the structure and the form of the imposed ground shaking. Major damage observed in earthquakes has been due mainly to poor structural concepts such as column sides way mechanisms due to a soft storey, considerable twisting due to lack of symmetry, and poor ductile detailing such as brittle connections, inadequate anchorage of reinforcement, or insufficient transverse reinforcement to prevent shear failure, premature buckling of compressed bars or crushing of concrete. The aim in seismic design should be to give the structure features which will ensure that the most desirable mode of inelastic deformation occurs by the formation of ductile plastic hinges at appropriate positions and that all other types of failure are prevented. This philosophy may be incorporated in a rational capacity design procedure which considers the required levels of flexural and shear strength of the beams, columns and joints. A proper assessment of the strength and ductility of a structure cannot be made using the allowable stress method and hence the strength method should be used. The ductile design approach for moment resisting frames requires particular consideration of the ratio of column to beam flexural strengths necessary to reduce the likelihood of plastic hinges forming simultaneously in the top and bottom of columns, the detailing of beams and columns for adequate ductility, and the mechanisms of shear resistance and bar anchorage in members and in beam-column joints. |
| PDFファイル名 | 010-06-0001.pdf |