木虫 (正式写手)
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11211121(金币+1, 翻译EPI+1): 2010-09-01 10:15:17
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With the continuous beams and rigid frame a wide range of applications found in the construction of some bridges cracks in the web. In this paper, elasticity, based on the use of ansys establishment of continuous beam, continuous rigid frame bridge three-dimensional solid model, the strength of concrete webs by three cases to the main tensile stress, and compared the maximum principal tensile stress within the web and tensile strength of concrete relationship, this shows the reason web cracks. Light of the actual bridge, in situ method using cantilever construction of concrete frames with four types of stress state condition, the maximum principal tensile stress is calculated, respectively: 1.04MPa, 3.93MPa, 2.81MPa and-0.47MPa. Therefore, effective control of vertical webs of prestressed concrete principal tensile stress, for the prevention of concrete principal tensile stress exceeds the internal webs of concrete tensile strength, should be first in the construction of vertical prestress tension, followed by the level of prestress tension steel, and finally tensioned prestressed reinforced vertical curve. |
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