When does the no-support condition exists in quicksand?

A round vertical steel column 500 mm in outside diameter and a wall thickness of 10mm is reinforced with four reinforcing bars 3 cm in diameter. It is filled with concrete and supports a load of 800 kN. Bearing plates are placed on top and bottom of the 1.5 m high column to assure equal deformation of the steel and concrete. Find the stress in each material and the change in height of the column. [Ec = 14 000 MPa, Es=200 GPa assume both column and steel re-bar are same type of steel]

The concrete I-beam of attached figure "a" is prestressed with four stranded cables having total area Ap = 0.575 in^2. Eccentricity of the steel varies parabolically from 0 at the supports to 7.58 in. at the center of the 30-ft span. The effective stress in the steel after losses is 132,000 psi. (a) What uniformly distributed superimposed load will produce cracking of the beam, given that the modulus of rupture fr = 475 psi? (b) What superimposed load will produce a balanced condition of external and equivalent prestressed load, such that uniform axial compression will be obtained in the concrete? (c) For the balanced load just computed, would the midspan deflection be downward, upward, or zero? Explain.

Problem The composite bar system in Figure 4.8 consists of a steel bar and a bronze bar that are both securely attached to a rigid block and rigid supports. The system is loaded with a total load P at the rigid block. If the total applied load P=42000 lb, determine the stresses in the two bars. 6′ S TE FIGURE 1.48 Composite bar system for Problem 12. Steel bar } Rigid block -} Bronze bar E₂ = 30 x 10º psi A₂ = 1 in² E-15 x 10 psi Ag-4 in²

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which of the follwoing(s) is/are the significant source of compression when loading is applied to a clay layer? a. air in the voids b. all available options c. deformation of soil grains d. water in the voids e. squeezing out of water from the voids

Problem The composite bar system in Figure 4.8 consists of a steel bar and a bronze bar that are both securely attached to a rigid block and rigid supports. The system is loaded with a total load P at the rigid block. If the total applied load P=42000 lb, determine the stresses in the two bars. 6′ S TE FIGURE 1.48 Composite bar system for Problem 12. Steel bar } Rigid block -} Bronze bar E₂ = 30 x 10º psi A₂ = 1 in² E-15 x 10 psi Ag-4 in²

A reinforced concrete beam has a width of 300 mm and effective depth of 500mm to the centroid of the tension reinforcements. Consider the steel reinforcements will be placed in a single layer arrangement. Concrete strength fc’ = 34.5 MPa. Determine the steel ratio of the section if the beam is singly reinforced with the maximum amount of steel for transition control allowed by the Code if the bars has a steel strength of fy = 345 MPa. Determine the steel ratio of the section if the beam is singly reinforced with the maximum amount of steel for tension control if the bars has a steel strength fy = 345 MPa. Determine the number of pieces of 28 mm ᴓ bars required for the section if the beam is singly reinforced with the maximum amount of steel for tension control if the bars has a steel strength fy = 415 MPa.