CONCRETE FRAME EXAMPLE

A concrete frame will be analized with RCsolver software program according to Eurocode 8 specifications. The frame in this example will consist of two rectangular columns and the connecting T-Section beam. RCsolver will perform capacity design of the two joints and calculate the required longitudinal and shear reinforcement for all members. The following data is available:

a. Left and right column section properties:

Rectangular section, b=0.5 m, h=0.6 m, C = 50 mm, Concrete C25/30, Steel B500C, minimum longitudinal bar diameter D14, minimum shear reinforcement bar diameter D10, number of stirrup legs = 4.

b. Left column properties:

H = 3 m, M,topz = 100 KNm, M,topy = 80 KNm, M,botz = -90 KNm, M,boty = -90 KNm, Vz = -70 KN, Vy = 80 KN, Ntop = 400 KN, Nbot = 450 KN (for axial → + for compression).

c. Right column properties:

H = 3 m, M,topz = -130 KNm, M,topy = -120 KNm, M,botz = 110 KNm, M,boty = 100 KNm, Vz = 60 KN, Vy = 70 KN, Ntop = 450 KN, Nbot = 500 KN (for axial → + for compression).

d. Beam section properties:

Beff = 1 m, h = 0.65 m, Bw = 0.25 m, tf = 0.2 m, C = 50 mm, Concrete C25/30, Steel B500C, proposed longitudinal bar diameter D18, proposed shear reinforcement diameter D10.

e. Beam properties:

L = 3 m, Mleft = -110 KNm, Mright = -120 KNm, Mspan = 70 KNm, Vleft(G+0.3Q) = -90 KN, Vright(G+0.3Q) = 90 KN, Vleft(1.35G+1.5Q) = 100 KN, Vright(1.35G+1.5Q) = -100 KN.

f. Eurocode 8 properties:

Behavior factor q = 3.9, Fundamental periods of vibration in the horizontal and in the perpendicular direction of interest: 1 sec.

Objective: Design all concrete frame members, calculating the required longitudinal and shear reinforcement.

Figure 1: RCsolver form for the definition of the concrete frame members

Figure 2: Beam section properties

Figure 3: Column section properties

Figure 4: Beam loading

Figure 5: Left column loading

Figure 6: Right column loading

Figure 7: 3D model in RCsolver

Figure 8: Beam results in RCsolver

Figure 9: Left column results in RCsolver

Figure 10: Left column results in RCsolver

Calculations

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RCsolver contains all calculation procedure according to Eurocodes 2 and 8, feel free to download RCsolver and view all the equations!