question(1) pic php7s43xd:
A cantilever beam is supported on the left square column . The load-bearing uniform static load (including the beam's own weight) wD = 3.2tf / m and the live load wL = 4.6 t / m. The tensile and deflection steel bars adopt two D36 steel bars with effective depth. It is 53 cm, the transverse reinforcement is D10 reinforcement and the spacing is 25 cm, and its net protective layer thickness is 4 cm. (A) Assuming that the beam uses constant-weight concrete fc'=210 kgf / cm^2, the flexural reinforcement and the transverse reinforcement strength are both fy=4200kgf / cm^2, try to use the detailed estimation method of the extension length of the tension reinforcement to calculate the tension reinforcement The required stretch length.
Rebar size: D36 rebar (db=3.58cm, Ab=10.07 cm^2), D10 rebar (db=0.95 cm, Ab=0.71 cm^2).
question(2):
If the cross-section of the rectangular beam is 40x100 cm, the concrete compressive strength used is 350 kgf /cm^2 and the steel bar yield strength is 4200 kgf / cm^2. After deflection design, it is found that the required tensile steel bar is 16 cm^2, the shear steel bar is D10, and the thickness of the concrete protective layer is 4 cm. Try to configure the same number of single layers according to the regulations for crack control Main bars (regardless of the spacing of beam main bars), the main bars available are D32 and D29.
Rebar size: D32 rebar (db=3.22 cm, Ab=8.14 cm^2), D29 rebar (db=2.87 cm, Ab=6.47 cm^2), D10 rebar (db=0.95 cm, Ab=0.71 cm^2) .
question(3): pic phpJEEDpw
The cross section of the column is shown in the figure below, f'c = 280 kgf / cm ^ 2, fy = 4200kgf / cm ^ 2, rebar size: D25 rebar (db = 2.54cm, Ab = 5.07cm ^ 2), try to find Balance destruction (Pb) and (Mb)
question(4): A simply supported beam with a uniform section has a span of 8.5 m and a section size of 35*50 cm, fc'=280kgf/cm^2, fy=4200kgf/cm^2. The tension steel bars are configured with 6 D25 steel bars, d=41cm, and the compression steel bars are 3 D19 steel bars, d'=6.5cm. In addition to the self-load of the beam, the additional static load is 0.3 tf/m. The live load is 1.6 tf/m.
Try to find (a) the instant deflection under the simultaneous action of static load and live load. (B) After 5 years, the total deflection under continuous load including creep and shrinkage is 2.0. Rebar size: D25 rebar (db=2.54 cm, Ab=5.07 cm^2), D19 rebar (d=1.91 cm, Ab=2.87 cm^2)
Deflection formula: ▲=5wL^4/ 384EI
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FIRST ANALAZE THE SYSTEMAND FIND OUT STRAINING ACTIONS THEN, DESIGN THE CROSS SECTIONS OF STARCTURAL ELEMENTS ..........................................................
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