钢板—薄层CRRPC组合结构栓钉连接件抗剪性能研究

发布时间：2018-04-11 14:39

本文选题：钢桥面铺装 + CRRPC　；参考：《湖南大学》2015年硕士论文

【摘要】：钢与混凝土组合桥梁的力学性能与结合面的连接方式紧密相关。栓钉连接件是工程中常用的剪力连接件,其主要作用是传递两者之间的界面剪力以及抵抗钢梁与混凝土板之间的掀起作用。本文以栓钉作为钢-薄层CRRPC(Co MPact Reinforced Reactive Powder Concrete)超高性能轻型组合桥面结构剪力连接件,对其抗剪性能进行了研究,主要完成了以下工作:从传统钢桥面铺装的使用现状及其主要病害,概括了活性粉末混凝土(RPC)的主要材料性能,并与普通混凝土进行的对比,引出了钢-薄层CRRPC混凝土组合桥面结构。本文重点关注了钢-薄层CRRPC组合桥面结构抗剪问题,对传统剪力连接件的分类和特点进行了叙述,以栓钉连接件作为研究对象,对其抗剪承载力性能、抗剪疲劳性能的研究现状进行了总结。结合有限元分析方法,研究了栓钉连接件在推出试验中的抗剪承载力、荷载滑移曲线和剪切刚度试验研究,试验结果表明:钢板与CRRPC层间的粘结效应对试件的力学性能影响较大,可以提高试件40%的抗剪承载力,降低31%的滑移量。若不考虑CRRPC与钢板间粘结力,栓钉剪切刚度为52.5N/mm,反之为120.6N/mm。基于推出试验,研究应力比和界面联接方式对栓钉剪切疲劳寿命的影响,得到滑移-加载次数曲线,试验结果表明:应力比是影响栓钉抗剪疲劳寿命关键因素之一,对于钢板与CRRPC间存在粘结效应的推出疲劳试验,应力比建议取0.4;钢板与CRRPC间的粘结效应是影响疲劳寿命另一重要因素,对于存在粘结效应的推出试件,在0.5的应力比下等效疲劳寿命可以达到92.2万次,但无粘结时,疲劳寿命仅为16.9万次。为了进一步研究栓钉连接件在钢-薄层CRRPC组合桥面结构中的整体受力性能,本文对岳阳洞庭湖二桥主梁单节段进行了有限元静力分析。研究表明:栓钉的滑移量和剪应力分布特点相对一致,由跨中向梁端增长,但最大滑移量和最大剪应力并不在梁端,这与材料力学纯理论分析结果并不相同。最后进行了跨中加载梁式疲劳试验,试验表明:栓钉间距为125mm×125mm时,即使钢板与CRRPC间不存在粘结效应,在等效实桥应力幅下经过5912.2万次疲劳加载,组合梁界面仍没有发生疲劳破坏。
[Abstract]:The mechanical properties of steel-concrete composite bridges are closely related to the connection mode of the joints.Pin joint is a commonly used shear connection in engineering. Its main function is to transfer the interfacial shear force between them and to resist the lift between steel beam and concrete slab.In this paper, the shear properties of light-duty composite deck structure with ultra-high performance are studied with stud as steel-thin-layer CRRPC(Co MPact Reinforced Reactive Powder crete. The main work is as follows: from the use of traditional steel deck pavement and its main diseases,The main material properties of reactive powder concrete (RPCs) are summarized, and compared with ordinary concrete, the steel-thin CRRPC concrete composite deck structure is introduced.This paper focuses on the shear resistance of steel-thin-layer CRRPC composite deck structure, and describes the classification and characteristics of the traditional shear connectors.The research status of shear fatigue properties is summarized.Combined with the finite element analysis method, the shear bearing capacity, load-slip curve and shear stiffness of the stud joint in the push-out test are studied.The experimental results show that the bond effect between the steel plate and the CRRPC layer has a great effect on the mechanical properties of the specimens, which can increase the shear strength of the specimens by 40% and reduce the slip by 31%.If the bonding force between CRRPC and steel plate is not taken into account, the shear stiffness of the bolt is 52.5 N / mm and 120.6N / mmmmm.The influence of stress ratio and interface connection on the shear fatigue life of bolt is studied, and the slip loading times curve is obtained. The test results show that the stress ratio is one of the key factors affecting the shear fatigue life of bolt.The stress ratio between steel plate and CRRPC is suggested to be 0.4. The bond effect between steel plate and CRRPC is another important factor affecting fatigue life.The equivalent fatigue life can reach 922000 times at the stress ratio of 0.5, but the fatigue life is only 169000 times when the bond is unbonded.The results show that the slip amount and shear stress distribution of the studs are relatively consistent, increasing from the middle span to the end of the beam, but the maximum slip amount and the maximum shear stress are not at the end of the beam, which is different from the results of pure theoretical analysis of material mechanics.Finally, the fatigue test of mid-span loading beam is carried out. The results show that when the pin spacing is 125mm 脳 125mm, even if there is no bond effect between steel plate and CRRPC, it is subjected to 59.122 million times of fatigue loading under the stress amplitude of iso-effect bridge.There is no fatigue failure at the interface of the composite beam.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

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