大跨徑連續(xù)剛構(gòu)橋底板崩裂機(jī)理及其影響研究
[Abstract]:Long span continuous rigid frame bridge is one of the most widely used bridges. Because the design theory is not perfect and the construction quality is defective, the bridge is often damaged in the construction and operation stage, among which the floor crack is one of them. The main causes of floor collapse are that the magnitude and influence of equivalent radial force are underestimated, and the design of anti-collapse is not reasonable. The collapse of the floor will have an adverse effect on the safety, durability and normal use of the structure. The engineering circle and academic circles have carried on the long-term, massive accident cause analysis to this kind of damage, this article uses the mathematical calculation and the finite element program to simulate two methods, on the basis of referring to a large number of documents and drawing lessons from the predecessor's achievement. The mechanism of floor collapse, the influence factors of box girder spatial effect, and the design of floor slab anti-collapse are analyzed. Firstly, this paper systematically studies the equivalent radial force of prestressed beam of long-span continuous rigid frame bridge, and analyzes the influence of vertical curve line, pipeline positioning error and segment construction on the equivalent radial force. This paper discusses how to control the equivalent radial force under these three factors, and puts forward a correction to the formula of the equivalent radial force on this basis. The influence of hollowness ratio of bottom slab, temperature gradient effect and Poisson effect of concrete on the stress of bottom slab of box girder are studied, and the corresponding suggestions are put forward. Secondly, taking the typical continuous rigid frame box girder bridge as the research object, through the finite element model, the anti-collapse design of the floor concrete is analyzed. The formulas for calculating the thickness of caving steel bar and prestressed pipe cover are summarized. By changing the thickness of the hole rib of the background bridge, the thickness of the protective layer of the pipeline and the thickness of the bottom slab, the effects of these changes on the stress of the bottom slab are compared. Finally, the causes of the collapse of a real bridge floor in Yunnan Province are analyzed, which verifies the rationality of the correction of the equivalent radial force and the analysis of the anti-collapse design proposed in this paper. Through the comparison and selection of the reinforcement scheme of the bridge, and through the design and construction experience of the box girder bridge at home and abroad, some experiences are summarized for reference.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U448.23
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