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原文传递 Simplified Shear Design of Structural Concrete Members. Appendixes. Final rept.

题名：	Simplified Shear Design of Structural Concrete Members. Appendixes. Final rept.
作者：	hawkins, n. m. kuchma, d. a. mast, r. f. marsh, m. l. reineck, k. h.
关键词：	Shear-; Design-; *Concrete-structures.;Reinforced-concrete; Prestressed-concrete; Tensile-properties; Stresses-; Failure-modes; Loads-Forces; Cracks-.
摘要：	A flexural member supports loads by internal moments and shear forces. Classical beam theory, in which plane sections are assumed to remain plane, provides an accurate, simple, and effective model for designing a member to resist bending in combination with axial forces. The simplicity and rationality of beam theory can be kept even after cracking for several reasons. The first reason is that flexural cracks form perpendicular to the axis of bending so that the traditional plane sections remain plane assumption is valid. The second reason is the weakness of concrete in tension, so that tensile stresses can be effectively neglected at a crack. The third reason is that flexural failure occurs at the maximum moment location so that consideration of conditions at the maximum moment section is sufficient for flexural design. Shear failure is initiated by inclined cracks caused not only by shear force but also by shear force in combination with moments and axial loads. The shear failure load depends on numerous factors such as the dimensions, geometry, loading and structural properties of members. Because shear cracks are inclined and the shear failure load depends on a large number of factors, shear design--unlike flexural design--must consider the response of a finite length of the member, (B-region), rather than the response of a single section. Due to the complications of shear behavior and the difficulties of shear design, the shear behavior and shear strength of members have been major areas of research in reinforced and prestressed concrete structures for decades.
报告类型：	科技报告