基于裂縫特征參數(shù)的混凝土梁預(yù)應(yīng)力評(píng)價(jià)
[Abstract]:Prestressed technology has been widely used in the construction of bridge structures. However, due to the deficiencies in design, construction and operation management, the rapid development of prestressed concrete bridges has also led to a large number of diseases. This not only affects the performance of bridge structure, but also endangers the safety of bridge structure. In view of the cracking problem of the existing prestressed concrete bridge, based on the measured crack parameters, this paper analyzes each crack section of the main beam, and evaluates the effective prestress in the post-cracking prestressed concrete beam. The main contents of this paper are as follows: firstly, an analytical method of effective prestressing force after cracking of rectangular T-shaped and box section of prestressed concrete is proposed. The size of effective prestress of section is obtained, which provides a theoretical basis for evaluating the distribution of effective prestress along the bridge. Secondly, based on the section analysis, the analysis method of effective prestress distribution along the course is provided, and the statistical parameters of crack distribution of the main beam under different load levels are established by taking a prestressed concrete simply supported T beam as an example. The effective prestress in the main beam is calculated by analytic analysis method. Finally, based on a small prestressed concrete box girder with serious cracking, the height of the concrete compression zone and the effective prestressing force under each tension control force grade are calculated. It is compared with the effective prestressing force under the actual crack condition.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U448.35
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