Thick Reinforced Concrete Walls Subjected To Non-Uniform Restrained Shrinkage

Several researchers have studied the behavior of reinforced concrete walls under restraint shrinkage, which demonstrate the variation of the degree of restraint with different Length/Height ratios. In general, concrete standards and codes of practice recommend a minimum amount of reinforcement for shrinkage effects. This research investigates the response of thick reinforced concrete walls subjected to restraint shrinkage. The parameters studied are the thickness of reinforced concrete walls, and non-uniform distribution of shrinkage along the Length\Height and through the thickness of the wall. This study uses the non-linear finite element method to simulate the cracking behavior of the concrete and to predict tensile stresses in the reinforcement in the vicinity of Cracks. Moreover, this study investigates the influence of reinforcement ratio and compares the results with well-known concrete standards and codes of practice. It is concluded that the non-uniform shrinkage through the thickness of the wall may have significant impact on the cracking behavior of thick concrete walls. In addition, as expected, higher reinforcement ratio results in lower tensile stresses in the reinforcement. The thesis also provides guidelines for minimum reinforcement ratio.

Thick Reinforced Concrete Walls Subjected To Non-Uniform Restrained Shrinkage

Several researchers have studied the behavior of reinforced concrete walls under restraint shrinkage, which demonstrate the variation of the degree of restraint with different Length/Height ratios. In general, concrete standards and codes of practice recommend a minimum amount of reinforcement for shrinkage effects. This research investigates the response of thick reinforced concrete walls subjected to restraint shrinkage. The parameters studied are the thickness of reinforced concrete walls, and non-uniform distribution of shrinkage along the Length\Height and through the thickness of the wall. This study uses the non-linear finite element method to simulate the cracking behavior of the concrete and to predict tensile stresses in the reinforcement in the vicinity of Cracks. Moreover, this study investigates the influence of reinforcement ratio and compares the results with well-known concrete standards and codes of practice. It is concluded that the non-uniform shrinkage through the thickness of the wall may have significant impact on the cracking behavior of thick concrete walls. In addition, as expected, higher reinforcement ratio results in lower tensile stresses in the reinforcement. The thesis also provides guidelines for minimum reinforcement ratio.

Kea, Nestor notabilis, achieve cooperation in dyads, triads, and tetrads when dominants show restraint

Animal cooperation in the wild often involves multiple individuals that must tolerate each other in close proximity. However, most cooperation experiments in the lab are done with two animals, that are often also physically separated. Such experiments are useful for answering some pertinent questions, for example about the understanding of the role of the partner and strategies of partner control, but say little about factors determining successful cooperation with multiple partners in group settings. We explored the influence of dominance, rank distance, tolerance, affiliation, and coordination by testing kea parrots with a box requiring two, three, or four chains to be pulled simultaneously to access food rewards. The reward could be divided unevenly, but not monopolized completely. Eventually dyadic, triadic, and tetradic cooperation tasks were solved, showing that non-human animals are capable of tetradic cooperation in an experimental setup. Starting with two chains, we found that in a dyad monopolization of the box by the highest-ranking bird was the largest obstacle preventing successful cooperation. High-ranking birds learned to restrain themselves from monopolizing the box during a single session in which monopolization was hindered by the presence of a large number of birds. Thereafter, restraint by dominants remained the strongest factor determining success in the first trial in dyadic, triadic, and tetradic setups. The probability of success increased with the degree of restraint shown by all dominant subjects present. Previous experience with the task contributed to success in subsequent sessions, while increasing rank distance reduced success notably in the four-chain setup.

‘If Your Jeans Are Original, How Come Everyone Else Has One?’

This chapter deals with exclusionary strategies and their representations in colonial, postcolonial, and post-liberalization phases in India. Citing a wide range of secondary sources, it establishes how exclusionary strategies and conscious social distancing were central to the formation of middle-class identity in the colonial and postcolonial India. The author argues that middle-class attitudes towards consumption were characterized by a certain degree of restraint and thrift. However, in the post-liberalization phase, there is an erosion of that miserly attitude towards a guilt-free consumption, leading to unapologetic material indulgences. This chapter looks at popular visual registers such as advertisements to argue how the exclusionary zeal increasingly is visually mediated and manifested through portrayals of exclusivity. It particularly focuses on apparel advertisements that emphasize the ideas of class, exclusivity, and difference. It asserts that the visual aspects of commodity have become exterior markers of difference, as the desire for distinction is more visceral than before.

Toleration

Toleration emerged as an important idea in the seventeenth century, receiving its fullest defence in John Locke’s A Letter Concerning Toleration (1689). Initially developed in the context of attempts to restore peace in a Europe convulsed by religious conflicts, in the nineteenth and twentieth centuries it came to be extended to the accommodation of disputes about racial, sexual and social differences. Toleration is widely thought to be an essential element of a free society, especially one marked by moral and cultural pluralism, and it figures particularly prominently in the political theory of liberalism. The paradigm example of toleration is the deliberate decision to refrain from prohibiting, hindering or otherwise coercively interfering with conduct of which one disapproves, although one has the power to do so. The principal components of the concept of toleration are: a tolerating subject and a tolerated subject (either may be an individual, group, organization or institution); an action, belief or practice which is the object of toleration; a negative attitude (dislike or moral disapproval) on the part of tolerator toward the object of toleration; and a significant degree of restraint in acting against it. Philosophical arguments have mostly concerned: the range of toleration (what things should or should not be tolerated?); the degree of restraint required by toleration (what forms of opposition are consistent with toleration?); and, most importantly, the justification of toleration (why should some things be tolerated?).

Experimental Evaluation of Residual Stresses in the Concrete

Generally, volume changes commences almost immediately after the cement and water come in contact during concrete mixing. Humidity of surrounding environment affects the magnitude of shrinkage. Hence, we took it into account by means of Eurocode 2. This paper proposes the evaluation of residual stresses in concrete. To describe the development of residual stresses, magnitude of free shrinkage, degree of its restrain and corresponding value of elastic modulus has to be known. All required quantities was measured apart from degree of restraint. It was tested three types of concrete mixtures. Obtained results show that the free shrinkage value can be significantly reduced by technological way such as the change of concrete composition.