球墨铸铁管道柔性接口在往复荷载作用下力学性能试验研究

发布时间：2018-06-26 07:45

本文选题：球墨铸铁管道 + 柔性接口　；参考：《河南工业大学》2017年硕士论文

【摘要】：球墨铸铁管作为已在我国大部分地区广泛使用的管道,具有强度高、韧性好、耐腐蚀等特点。由球墨铸铁管等组成的城市地下管网在现代城市生活中具有重要的作用,被称为城市生命线。而随着现代城市的繁荣发展,人口集中且建筑高密度,地下管网的主要地位将更加突出,不仅保障了城市的正常运转,也为防灾减灾提供了重要的功能保障。管道接口作为管道抗震的薄弱环节。管道接口一旦发生破坏就会导致水的渗漏以及燃气的泄露,影响整条管线的功能并造成大量经济损失,因此对于管道接口的研究已是至关重要。如今,国内外学者已对管道接口进行了大量的理论及试验研究,但与丰富的理论研究相比,试验研究仍显不足,且已做过的管道接口试验研究大多以静载拉拔、弯曲为主。本文针对不同管径的球墨铸铁管道柔性接口开展了三种模式的轴向足尺试验研究,即在无水与有水压情况下,进行了不同速率的拉拔试验、多周期往复加载试验以及逐级往复加载试验。以不同速率的拉拔试验为基础,以往复加载试验为重点,获得的力与位移的关系、滞回曲线的特点及面积、极限位移值、抗拔力等数据,通过拟合试验数据,建立管道接口的轴向力学模型,分析柔性接口在不同加载条件下的力学性能与失效机理,为管道地震反应分析的理论研究提供柔性节点抗震性能相关计算参数。针对不同管径的球墨铸铁管道柔性接口开展了两种模式的弯曲足尺试验研究,即在无水与有水压两种情况下,进行了弯曲试验与横向往复加载试验。观察不同加载条件下胶圈接口在弯曲作用下的变化形态,记录试验中接口弯矩与转角的数据,得出接口弯矩与转角的关系与往复加载试验中的滞回曲线,求解不同滞回曲线的面积,分析不同管径的管道在不同加载模式下的弯曲机理,拟合试验数据,建立力学模型,为地下管道胶圈接口的抗震设计提供接口抗力参数和技术支持。
[Abstract]:Ductile iron pipe, which has been widely used in most areas of China, has the characteristics of high strength, good toughness and corrosion resistance. Urban underground pipe network composed of ductile iron pipes plays an important role in modern urban life and is called urban lifeline. With the prosperity and development of modern cities, the population is concentrated and the building density is high, the main status of underground pipe network will be more prominent, which not only guarantees the normal operation of the city, but also provides an important functional guarantee for disaster prevention and mitigation. Pipeline interface is the weak link of pipeline seismic resistance. Once the pipeline interface is destroyed, it will lead to the leakage of water and gas, which will affect the function of the whole pipeline and cause a lot of economic losses, so it is very important to study the pipeline interface. Nowadays, scholars at home and abroad have done a lot of theoretical and experimental research on pipeline interface, but compared with the abundant theoretical research, the experimental research is still insufficient, and most of the experimental research on pipeline interface has been done in the form of static drawing and bending. In this paper, three kinds of axial full-scale tests for ductile iron pipe flexible joints with different diameters have been carried out, that is, drawing tests with different rates have been carried out under the condition of no water and water pressure. Multi-cycle reciprocating loading test and step-by-step reciprocating loading test. On the basis of drawing test with different rates, the relation between force and displacement, the characteristic and area of hysteretic curve, the limit displacement value, the pull-out force and so on are obtained by fitting the test data. The axial mechanical model of pipeline interface is established and the mechanical properties and failure mechanism of flexible joints under different loading conditions are analyzed. The relevant calculation parameters of seismic behavior of flexible joints are provided for the theoretical study of pipeline seismic response analysis. Two types of full-scale bending tests were carried out for ductile iron pipe flexible joints with different diameters, that is, bending tests and transverse reciprocating loading tests were carried out under the conditions of anhydrous and water-pressure. Observing the changing form of the rubber joint under different loading conditions, recording the data of the interface moment and the angle of rotation in the test, the relationship between the interface moment and the turning angle and the hysteresis curve in the reciprocating loading test are obtained. The area of different hysteretic curves is solved, the bending mechanism of pipes with different pipe diameters under different loading modes is analyzed, the experimental data are fitted, the mechanical model is established, and the interface resistance parameters and technical support are provided for the seismic design of the rubber ring joints of underground pipelines.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3

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