Civil Engineering Construction and Types of Bridges Assignment - 1

Civil Engineering Construction and Types of Bridges - Assignment Example These are one of the oldest forms of the bridge that were introduced by the Romans. In this method, the total downward weight of the arch bridge is distributed along the arch and the load taken up by abutments kept at the outer end of the bridge. This abutment or a kind of stopper prevents the arch from straightening out and keeps the structure of the bridge intact. The olden day arch bridges were constructed of wedge-shaped stones that were arranged neatly to take the shape of an arch. The Pont du Gard aqueduct built near Nimes in France is an excellent example of an arched construction standing the test of time. (Hill James et al, n.d) The modern-day construction involves the use of concrete in construction. These are also reinforced using steel. These new methods of construction make it possible to construct bridges up to 800 ft spans. (Beniwal Tarun et al, 2007) (iii) Concrete Arch Bridge- In this method precast concrete segments in the form of wedges are arranged in arches that are supported on temporary sections. Sometimes two arches may be used and these are supported in the middle using a vertical support called a spandrel. (Hill James et al, n.d) Beam bridges involve a simple design of a beam that is supported at its ends. The loads that act on the bridges act as reactions at the ends. A single span can usually support a span of 250 ft. Pre-stressed concrete that is adequately reinforced using steel rods are used in construction. The concrete can sustain the compressive loads while the steel can take the tensile loads. (Hill James et al, n.d ) Concrete bridges have the advantage that the raw materials are easily available and skilled labor is not required for laying. Three methods are commonly used for the construction of bridges. (i) Balanced cantilever Method- This method involves the construction of a falsework that supports a counterbalance weight and thus prevents the cantilever from tilting over during  progressive construction.

Punishing children Essay Example | Topics and Well Written Essays - 1250 words

Punishing children - Essay Example Therefore, families should not adopt corporal punishment as a technique of teaching children how to behave as it impacts negatively on behavior, both in the short term and long term. Increasingly, research studies point out to the unintended negative consequences of corporal punishment. First, corporal punishment increases aggression among children as they appreciate physical violence as a form of solving conflicts, just as applied by their parents. Corporal punishment entails use of physical force which exhibits a positive curvilinear relationship with aggression in children. In fact, while vouching for the need for legislation against this form of punishment, Smith cites the United Nations Committee on the Rights of the Child referring to it as â€Å"legalized violence against children.† A review of various research studies by Elliman and Lynch (197) indicates that corporal punishment results in the child complying with the parental demands immediately after being hit, but f or a short term. Such a child does not learn what the desired good is and hence the threat of need for greater frequency and intensity of corporal punishment so as to maintain the compliance. This causes significant physical abuse among the children exposed to corporal punishment. Humphrey and Schmalleger observe that in school, such children are twice more likely to attack other children physically within 6 months (121). Further, such children exhibit tendencies of abuse of child or partner late in life. They become antisocial and have the sense of conscience, moral internalization and empathy in them significantly reduce (Aucoin, Frick, and Bodin 528). Therefore, corporal punishment does not cause positive behavioral gains, but rather arouses and propagates aggression in children. Corporal punishment has also been noted to increase the likelihood of children becoming delinquent. In fact, as noted by Aucoin, Frick, and Bodin (529), corporal punishment could lead to behavioral probl ems as opposed to behavioral problems leading to corporal punishment. As such, these children develop delinquent behaviors later in life. Continued use of corporal punishment upholds delinquent behavior, such trouble at school and lying, two years later (Humphrey and Schmalleger 120). Indeed, a research study documented by Elliman and Lynch on 4,888 residents of Ontario aged below 65 with no history of sexual or physical violence, but reported being spanked or slapped, exhibited significantly higher tendencies of alcohol abuse, dependence and anxiety disorders (197). It should therefore be appreciated that whereas corporal punishment aims at instilling desirable behavior in a child, it could lead to delinquency in children. The third negative impact of corporal punishment entails the lowering of self-esteem among children, together with causing depression. The physical pain that children endure as a result of corporal punishment causes a rise of bitterness in them. With limited oppo rtunities to release such feelings, such children end up being stressed and eventually depressed. Children who have been through years of emotional pain as a result of being