Problem-1 : A simply supported plain concrete beam having a square cross section (150mmx150mm) was tested to fail under flexure as shown in Figure-1 below. For this beam find the flexural tensile strength (modulus of rupture). Note that a = 150mm and the load at failure P=18.75kN. P P а а a

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Q: 13 KN 82 KN/m 3.855 m 3.855 m A B 7.77 m 6.39 m

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Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.