Tài liệu tham khảo giáo trình nhôm trong thiết kế xây dựng bằng tiếng anh - Chương 8 Beams GENERAL APPROACH This chapter covers the performance of aluminium beams under static loading, for which the main requirement is strength (limit state of static strength). In order to check this there are, as in steel, four basic failure modes to consider: 1. 2. 3. 4. bending-moment failure; shear-force failure; web crushing; lateral-torsional (LT) buckling. | CHAPTER 8 Beams GENERAL APPROACH This chapter covers the performance of aluminium beams under static loading for which the main requirement is strength limit state of static strength . In order to check this there are as in steel four basic failure modes to consider 1. bending-moment failure 2. shear-force failure 3. web crushing 4. lateral-torsional LT buckling. The resistance to bending failure Section must be adequate at any cross-section along the beam and likewise for shear force Section . When high moment and high shear act simultaneously at a cross-section it is important to allow for their combined effect Section . The possibility of web-crushing arises at load or reaction points especially when there is no web stiffener fitted Section . Lateral-torsional buckling becomes critical for deep narrow beams in which lateral supports to the compression flange are widely spaced Section . In checking static strength the basic requirement is that the relevant factored resistance should not be less than the magnitude of the moment or force arising under factored loading Section . The factored resistance is found by dividing the calculated resistance by the factor m. The main object of this chapter is to provide means for obtaining the calculated resistance corresponding to the various possible modes of static failure. The suffix c is used to indicate calculated resistance . When a member is required to carry simultaneous bending and axial load it is obviously necessary to allow for interaction of the two effects. This is treated separately at the end of Chapter 9. For aluminium beams it is also important to consider deflection serviceability limit state bearing in mind the metal s low modulus. This is a matter of ensuring that the elastic deflection under nominal loading unfactored service loading does not exceed the permitted value Section . Copyright 1999 by Taylor Francis Group. All Rights Reserved. MOMENT RESISTANCE OF THE .
