Differential Creep
Differential Creep - Related Videos
01:22
Creep in Concrete
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2024
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
01:28
Factors Affecting Creep
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2024
In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep. Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
01:25
Effects of Creep
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2024
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
09:51
Measuring Plant Cell Wall Extension (Creep) Induced by Acidic pH and by Alpha-Expansin
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Cited by 43 •
2009
We demonstrate the use of a constant-force extensometer to measure long-term extension (creep) of plant cell wall specimens induced by acidic buffers and expansin protein.
05:14
Differentiating Immortalized Multipotent Otic Progenitors into Spiral Ganglion Neurons and Evaluating the Differentiation
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2025
The video demonstrates the differentiation of immortalized multipotent otic progenitors (iMOPs) into spiral ganglion neurons (SGNs) and immunofluorescence-based confirmation of the differentiation. The iMOPs are plated onto culture substrate-coated coverslips in a neuronal differentiation medium for differentiation into SGNs. The differentiated cells are labeled with antibodies specific for neuronal differentiation markers and analyzed under a microscope to confirm differentiation.
FAQs
Differing stress levels, material age, moisture, temperature, composition, and member dimensions can change the rate of time-dependent deformation. Consequently, adjacent regions that experience different conditions may not deform together. Identifying these contrasts is essential because they determine where incompatibility develops and whether the resulting response appears as internal stress, distortion, cracking, or excessive long-term movement.
When a faster-creeping region is connected to a neighboring region that deforms more slowly, the connection limits their independent movement. The regions then transfer force to maintain compatibility, producing internal stress and possible distortion. This restraint mechanism explains why local differences in creep behavior can affect the response of an entire member rather than remaining isolated.
A uniform creep assessment can focus on the overall time-dependent deformation produced by sustained loading. Differential creep analysis must additionally compare deformation rates between regions and evaluate the restraint linking them. That comparison reveals incompatibility, force transfer, and load redistribution that a single average deformation value may not capture, particularly in members with varying materials or conditions.
Begin by identifying regions with different stress, age, moisture, temperature, composition, or dimensions. Estimate how their creep rates differ under sustained loading, then determine how connected regions restrain one another and transfer force. The resulting analysis should examine internal stress, distortion, cracking, deflection, and serviceability so engineers can judge long-term structural performance.
The analysis can indicate whether unequal deformation may produce cracking, excessive deflection, prestress losses, or redistribution of load. These outcomes provide a serviceability perspective in addition to short-term strength considerations. By linking local creep differences to structural response, engineers can identify long-term performance concerns before selecting design or assessment measures.
Engineers apply the concept to concrete structures and composite members, including bridges and buildings, where connected regions may experience different creep conditions. It also matters in high-temperature components, in which temperature and material differences can alter deformation rates. In each setting, the goal is to assess distortion, force transfer, and reliable long-term behavior under sustained loading.