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Chapter 3 Statically Determine BeamsThe suspension method used for constructing bending moment diagram of the simple beam AB can be employed to construct the bending moment diagram of the segment AB shown in Fig.3.8. Therefore, for a segment of a member, the moment diagram may be constructed as follows. Firstly, determine the end moments Secondly, take the dashed line as the base line, superimpose the ordinates ( in the direction perpendicular to AB ) of the EXAMPLES 3-4
Construct the bending moment diagram for the overhanging beam shown in Fig.3.9 (a). Solution It is necessary for constructing bending moment diagram to find reactions. 1. Determination of bending moments of control sections. The section A, B and D are control sections at which loads vary discontinuously, which divide the beam into two segments AB and BD. By the method of sections we obtain the bending moments.
2.Consstructing bending moments diagram segment by segment. Take axial line AD as the abscissa axis; indicate the location of control segment (A,B and D ); lay off the ordinates at points A,B and D on tension side of the beam by the magnitudes of Connect points Note that since a concentrated load of 4kN is applied at the middle of the segment AB, the bending moment diagram
3.3 The analysis of Simply supported Inclined Beams Knowing from strength of materials, the bending moment value
The bending moment value
The bending moment diagram in the segment BD can be plotted by considering the segment as a cantilever beam and directly drawing the moment diagram with no need of method of superposition as well.
3.3 The Analysis of Simply Supported Inclined Beams In the civil engineering constructions, inclined beams shown as in Fig.3.10 (b) and (c), are commonly used as the analyzing models of stairs.(Fig.3.10(a)). The axial line of an inclined beam is straight slope line; its slope angle is denoted by
Date: 2015-02-28; view: 790
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