【作者】 秦秋红；

【导师】 曹明兰； 蒋晓东；

【作者基本信息】 郑州大学 ， 建筑与土木工程， 2011， 硕士

【摘要】 桥梁伸缩缝由于长期暴露在大气中,并直接承受车辆荷载的冲击,因此极易遭受破坏,需要不断进行维修,这不仅影响通车,还提高了工程造价。尽管多年来出现了不少改进的设计并提出了不少更好的保养和维修方法,例如使用高性能纤维混凝土、高强度混凝土或环氧树脂涂层,但取得的效果一般,存在诸多缺陷与不足,都没能从根本上解决问题。近年来,出现的一种新型水泥基复合材料----ECC材料,由于其卓越的抗裂抗变形能力,正受到了土木工程领域的广泛关注。有鉴于此,本论文研究尝试探讨如何利用ECC材料设计柔性桥面连接板,以代替传统的伸缩装置从而满足温度等的变形需要。由于ECC材料具有独特的性能——优异裂缝控制能力和良好的应变能力,故用ECC材料建造柔性桥面连接板,不仅能够满足温度等变形的需要,还能够减少了桥梁结构中裂缝的出现,提高了桥梁结构的耐久性,从长远来看又具有良好经济性。本论文简要分析了传统伸缩装置的破坏原因、设计方法,及不足之处；研究了新型桥面连接结构——ECC桥面连接板的设计流程和计算方法以及计算中面临的一些问题及其解决方法；探讨了ECC桥面连接板的施工工艺及ECC材料制作中的一些问题；并提出了关于我国ECC桥面连接板研究和应用方面的一些意见和建议。桥面连接板不仅使行车平稳舒适,而且能够提高桥梁的耐久性,防止漏水现象。同时由于ECC材料是一种高韧性的延性混凝土,具有很强的能量吸收能力,有利于桥梁结构的抗震。柔性桥面连接板代替传统的伸缩缝,在不改变简支梁桥性质的前提下,解决了伸缩缝与梁端连接处界面存在的裂缝问题等,非常有必要在我国推广应用。更多还原

【Abstract】 Being under long-term exposure in the atmosphere and subjected to the impact of vehicle loads directly, bridge expansion joints are subject to damaging easily and need frequent maintenance, which not only affects the traffic but also increases the project cost. Although many improved designs and a lot of better maintenance and repair methods such as using high-performance fiber reinforced concrete, high strength concrete or epoxy resin coating, have been proposed over the years, their effects are not good enough and there are many defects and shortages, so the problems have not been solved fundamentally. Recently, a new cementitious composite----ECC material is getting more and more attention in the field of civil engineering because of its outstanding properties in anti-crack and anti-deformation. In view of this, in order to meet the deformation needs induced from the temperature and so on, how to use the ECC material to design flexible bridge deck link slabs, instead of traditional expansion joints, is an attempt in the paperFor the reason that ECC material has unique properties -the excellent ability of cracks control and the good ability of strain, so, using ECC material to construct flexible bridge deck link slabs not only can meet the needs of the temperature deformation, but also can reduce and prevent cracks in the bridge structure. Meanwhile, the durability of bridge structures can be improved and good long-term economic benefit can be achieved.Destruction reasons, design method and deficiencies of traditional expansion joints are analyzed, the design process of a new deck connection structure-ECC deck link slab, and its calculation methods as well as problems that may be faced during the calculation and their solutions are investigated, the construction techniques of ECC deck link slabs and large scale mixing of ECC materials are discussed, and some opinions and suggestions on researches and applications of the ECC deck link slab in our country are proposed in the paper.The link slab is not only able to make a travelling smooth and comfortable, but also increase the bridge durability and prevent the bridge leaking phenomenon. Meanwhile, the ECC material is a high-toughness and ductile concrete, which has a strong ability to absorb energy and is helpful to anti-earthquake of bridge structures. To use ECC link slabs, instead of traditional expansion joints, don’t change the nature of simply supported bridges and solves the crack problems whick exit in the connection interface of expansion joints and the girder end, so it is necesarry to promote the application in China.更多还原