氯离子作用下钢—混凝土组合梁的耐久性研究

【作者】 龚匡晖；

【导师】 余志武；

【作者基本信息】 中南大学 ， 结构工程， 2009， 硕士

【摘要】 钢—混凝土组合结构兼具钢结构和混凝土结构的优点,极具发展和应用前景。然而,我国在结构设计中普遍重视结构安全性和适用性而忽视耐久性。这很容易使钢—混凝土组合结构由于耐久性能不足而提前破坏,造成重大经济损失。本文针对我国钢—混凝土组合梁研究中存在的问题,利用快速锈蚀试验分析钢—混凝土组合梁在氯离子侵蚀下的性能退化规律与破坏机理。主要研究内容如下:(1)利用氯离子侵蚀试验,以三种常见截面形式的钢—混凝土组合梁为对象,研究了氯离子侵入钢—混凝土组合梁的路径,为提高钢—混凝土组合梁的耐久性提供试验依据。(2)利用快速锈蚀试验,对比了栓钉锈蚀和工字钢锈蚀对推出试件力学性能的影响。研究了栓钉锈蚀后其抗拉及抗剪性能随其锈蚀率的变化规律。通过拟合得到锈蚀栓钉抗剪承载力降低系数,为栓钉锈蚀后钢—混凝土组合梁力学性能的研究奠定基础。(3)利用快速锈蚀试验,对比了栓钉锈蚀和钢梁锈蚀对钢—混凝土组合梁力学性能的影响。研究了栓钉锈蚀后钢—混凝土组合梁的力学性能随栓钉锈蚀率的退化规律。推出了部分抗剪连接的钢—混凝土组合梁在栓钉锈蚀后的抗弯承载力的计算公式,并对比了试验值与理论计算结果,验证了该公式的实用性。更多还原

【Abstract】 Steel-concrete composite beam has the advantages of both steel structure and concrete structure, and it would has vast application prospect .However, we emphasize the security and applicability but ignore the durability of structure in structure design. And this would make the structure failure before it’s service deadline, and lead to a grate economic loss. This article aim at the problems in studying the steel-concrete composite beam, study the deterioration law and damage mechanism by quick electrochemical corrosion experiment in chloride case. The main contents include:(1)This article aim at three kinds section form of the steel-concrete composite beam, study the route through which chloride ions into the steel-concrete composite beam by quick electrochemical corrosion experiment, and provide experiment background for the study of durability of steel-concrete composite beam.(2)Compare the effects on push-out specimens performance of bolts’ corrosion and steel beam’s corrosion by quick electrochemical corrosion experiment. Study the variation rule of tension and shear performance of the blot after its’ corrosion. Get the depressed coefficient of the corroded bolt by fitting, provide base for the studying durability of steel-concrete composite beam.(3) Compare the effects on steel-concrete composite beam of bolts’ corrosion and steel beam’s corrosion by quick electrochemical corrosion experiment. Study the variation rule of mechanical property of steel-concrete composite beam of the blot after its’ corrosion. Get the formula of the ultimate bearing capacity of partial shear connection steel-concrete composite beam, and compare the calculation result and experiment result, verify the Practicability of this formula.更多还原