Arch bridges can be constructed in only certain locations where the foundations on both sides are solid and stable. This is because this type of bridge needs more support from its sides.
There is no doubt that by incorporating(把……融入)arches into the design of arch bridges, they have gained some definite advantages. However, no matter how fantastic their design is, there are still some drawbacks that cannot be avoided. So we can conclude that the decision of having an arch bridge can be made by considering the aforementioned pros and cons.
Arch bridges
General
introduction
●Arch bridges have been in ___71___ for thousands of years.
●Their common building materials used to be bricks and stones, and now many new materials like concrete and steel have been used, because of which the arches are built more ___72___.
Pros
●Arch bridges are strong thanks to their curved designs, which ___73___ the load force being pushed straight downwards.
●The designs also contribute to the equal ___74___ of the bending force, and thus the bridges are more ___75___ to the force.
●Diverse materials used to build arch bridges are ___76___.
●The application of these materials enables the bridges to undertake heavy pressure, thus making them ___77___.
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