How do you calculate concrete creep?

Usually creep is determined by measuring the change with time in the strain of a specimen of concrete subjected to a constant stress and stored under appropriate conditions. A typical testing device is shown in Fig. 15.18.

How do you calculate creep coefficient?

2 Calculate the creep coefficient, ψ (t, ti), for the beam at infinite time according to S5. 4.2. 3.2. (V/S) b = volume to surface ratio for the beam = beam surface area is 2,955.38 in 2/ft (see Figure 2-3 for beam dimensions) and the volume is 13,020 in 3/ft = (13,020/2,955.38) = 4.406 in.

How do you calculate concrete floor loads?

Let, Assume the slab has a thickness of 150 mm. Slab Load Calculation = 0.150 x 1 x 2400 = 360 kg which is equivalent to 3.53 kN. Now, If we consider the Floor Finishing load to be 1 kN per meter, superimposed live load to be 2 kN per meter, and Wind Load as per Is 875 Near about 2 kN per meter.

What is the creep of concrete?

Concrete creep is defined as: deformation of structure under sustained load. Basically as long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.

What is the creep coefficient?

The. creep coefficient refers to the ratio of the concrete creep amplitude value to the instantaneous. compressive strain of the concrete. Concrete shrinkage refers to the shrinkage of the volume that. occurs during the initial setting or hardening of concrete.

What factors affect the creep of concrete?

Factors Affecting Creep Of Concrete:

• Water-cement Ratio: The rate of creep is increased with increasing water cement ratio.
• Humidity: It is influenced by humidity and drying condition of the atmosphere.
• Age Of Concrete: The rate of creep rapidly decreases with time.
• Admixtures:

What is creep of concrete Why does creep coefficient decrease with time?

Creep of concrete depends, on the stress in the concrete, age at loading and duration of loading. As long as the stress in the concrete does not exceed 1/3 of its characteristic compressive strength. According to table, if age of loading increases than creep coefficient of concrete will decreases.

What is the average value of creep coefficient of cement concrete?

Explanation: The creep coefficient varies from a minimum value of 1.5(for wet conditions) to a maximum value of 4.0(for dry condition), for design purposes it is convention to differentiate between deformation due to externally applied stress generally referred as creep and the deformation which occurs without …

What affects concrete creep?

The magnitude of creep is dependent upon the magnitude of the applied stress, the age and strength of the concrete, properties of aggregates and cementitious materials, amount of cement paste, size and shape of concrete specimen, volume to surface ratio, amount of steel reinforcement, curing conditions, and …

What factors affect creep?

Other factors affecting creep include type of cement, amount of cement paste, size and shape of concrete, amount of reinforcement (rebar), volume-to-surface ratio, temperature, and humidity.