累积损伤和残余应力对焊接组合厚板钢构件的力学性能的影响
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摘要
由于大型复杂结构的日益增加,作为主要受力构件的焊接厚钢板组合构件的力学性能及影响其性能的累积损伤和残余应力等因素亟需更加成熟的研究。由于目前国内外相关研究较少,因此,对焊接厚板组合钢构件在静力、低周往复荷载作用下的力学性能的分析和对影响该类构件性能的主要参数的研究,具有重要的理论意义和工程价值。
本文基于有限元分析软件ABAQUS,采用其用户子程序模拟累积损伤对构件的静力性能和滞回性能的影响。讨论了纵向残余应力和厚度方向残余应力对构件的力学性能的影响,通过一定规模的参数分析来探求影响构件承载能力的主要参数。
首先,本文研究了累积损伤、纵向残余应力和厚度方向残余应力对单调荷载作用下厚板钢构件静力性能的影响。参数分析包括板件宽厚比、板件厚度和轴压比。分析结果表明：考虑累积损伤后,构件的刚度和承载力会降低；纵向残余应力和厚度方向残余应力对构件的刚度和弹性承载力影响明显；宽厚比相同,厚度越大,累积损伤、纵向残余应力和厚度方向残余应力对构件静力性能的影响越显著。上述研究是低周循环荷载作用下构件滞回性能研究的基础。
随后,本文重点分析了低周循环荷载作用下,累积损伤对厚板钢构件滞回性能的影响。参数分析包括腹板高厚比和厚度、翼缘宽厚比和厚度、长细比等。在考虑损伤后,当构件的腹板高厚比和翼缘宽厚比较小时,腹板和翼缘厚度的大小对滞回性能影响显著。
最后本文研究了低周循环荷载作用下,同时考虑累积损伤、纵向残余应力和厚度方向残余应力对厚板钢构件的滞回性能的影响。研究的参数主要有：腹板高厚比和厚度、翼缘宽厚比和厚度等。只考虑残余应力时,当板件宽厚较小时,随着厚度的增加,构件延性系数降低。同时考虑累积损伤和残余应力后,当厚板构件翼缘宽厚比和腹板高厚比较小时,影响构件的主要参数是翼缘和腹板的厚度。当厚度大于100mm时,随着厚度的增加,构件刚度、承载力和延性系数随循环加载次数的增加而显著降低。
With the increasing huge complex structures, the combined welded heavy steel plates have become the major bearing capacity members, more reaserch should be done in the aspect of the mechanical properties and the effect of the accumulative damage and the residual stress. As litte relative research has been done, it plays an important and valuable role in the engineering that the research of the mechanical properties of the combined welded heavy steel plates under the monotonic horizontal and low reversed cyclic loading and the research of the major parameters.
Based on ABAQUS, the accumulative damage which is made of the UMAT is taken into the consideration of the static and hysterestic analysis of the members.The distribution of longitudinal residual stress and residual stress along the thickness have also been taken into consideration. A lot of work has been done to find out the major parameters which give the biggest effect.
Firstly, it's been dicussed the effect of the accumulative damage, distribution of longitudinal residual stress and residual stress along the thickness on the members under the monotonic horizontal loading. Parameter analysis includes width-thickness ratio, thickness and axial compression ratio. Members with accumulative damage have lower stiffness and capacity; Distribution of longitudinal residual stress and residual stress along the thickness have an obvious effect on the stiffness and elastic capacity; With the same width-thickness ratio, the thicker the thickness of the member is, the more obvious effect on static properties is showed with the consideration of damage, distribution of longitudinal residual stress and residual stress along the thickness. All of which is the basement of the hysterestic properties.
Subsequently, it's focused on the effect of the accumulative damage on the members'hysterestic properties. Large factors research has been done, such as width-thickness and thickness of the web and flange. Considering accumulative damage, thickness of the web and flange has an obvious effect on hysterestic properties, when width-thickness of the web and flange is in a lower range.
In the end, it's worked on the effect of the damage, distribution of longitudinal residual stress and residual stress along the thickness on the members' hysterestic properties. Large factors research has been done, such as width-thickness and thickness of the web and flange. Considering residual stress and lower width-thickness ratio, as the thickness increasing, the percentage of the ductility coefficient reducement is bigger. Considering the accumulative damage and residual stress, thickness of the web and flange has an obvious effect on hysterestic properties, when width-thickness of the web and flange is in a lower range. When thickness is higher than 100 millimeter, as the increasing times of the cyclic loading, the hysterestic loop gets thinner. The stiffness, load-carrying capacity and the ductility coefficient are lower as the thickness being thicker.
本文基于有限元分析软件ABAQUS,采用其用户子程序模拟累积损伤对构件的静力性能和滞回性能的影响。讨论了纵向残余应力和厚度方向残余应力对构件的力学性能的影响,通过一定规模的参数分析来探求影响构件承载能力的主要参数。
首先,本文研究了累积损伤、纵向残余应力和厚度方向残余应力对单调荷载作用下厚板钢构件静力性能的影响。参数分析包括板件宽厚比、板件厚度和轴压比。分析结果表明：考虑累积损伤后,构件的刚度和承载力会降低；纵向残余应力和厚度方向残余应力对构件的刚度和弹性承载力影响明显；宽厚比相同,厚度越大,累积损伤、纵向残余应力和厚度方向残余应力对构件静力性能的影响越显著。上述研究是低周循环荷载作用下构件滞回性能研究的基础。
随后,本文重点分析了低周循环荷载作用下,累积损伤对厚板钢构件滞回性能的影响。参数分析包括腹板高厚比和厚度、翼缘宽厚比和厚度、长细比等。在考虑损伤后,当构件的腹板高厚比和翼缘宽厚比较小时,腹板和翼缘厚度的大小对滞回性能影响显著。
最后本文研究了低周循环荷载作用下,同时考虑累积损伤、纵向残余应力和厚度方向残余应力对厚板钢构件的滞回性能的影响。研究的参数主要有：腹板高厚比和厚度、翼缘宽厚比和厚度等。只考虑残余应力时,当板件宽厚较小时,随着厚度的增加,构件延性系数降低。同时考虑累积损伤和残余应力后,当厚板构件翼缘宽厚比和腹板高厚比较小时,影响构件的主要参数是翼缘和腹板的厚度。当厚度大于100mm时,随着厚度的增加,构件刚度、承载力和延性系数随循环加载次数的增加而显著降低。
With the increasing huge complex structures, the combined welded heavy steel plates have become the major bearing capacity members, more reaserch should be done in the aspect of the mechanical properties and the effect of the accumulative damage and the residual stress. As litte relative research has been done, it plays an important and valuable role in the engineering that the research of the mechanical properties of the combined welded heavy steel plates under the monotonic horizontal and low reversed cyclic loading and the research of the major parameters.
Based on ABAQUS, the accumulative damage which is made of the UMAT is taken into the consideration of the static and hysterestic analysis of the members.The distribution of longitudinal residual stress and residual stress along the thickness have also been taken into consideration. A lot of work has been done to find out the major parameters which give the biggest effect.
Firstly, it's been dicussed the effect of the accumulative damage, distribution of longitudinal residual stress and residual stress along the thickness on the members under the monotonic horizontal loading. Parameter analysis includes width-thickness ratio, thickness and axial compression ratio. Members with accumulative damage have lower stiffness and capacity; Distribution of longitudinal residual stress and residual stress along the thickness have an obvious effect on the stiffness and elastic capacity; With the same width-thickness ratio, the thicker the thickness of the member is, the more obvious effect on static properties is showed with the consideration of damage, distribution of longitudinal residual stress and residual stress along the thickness. All of which is the basement of the hysterestic properties.
Subsequently, it's focused on the effect of the accumulative damage on the members'hysterestic properties. Large factors research has been done, such as width-thickness and thickness of the web and flange. Considering accumulative damage, thickness of the web and flange has an obvious effect on hysterestic properties, when width-thickness of the web and flange is in a lower range.
In the end, it's worked on the effect of the damage, distribution of longitudinal residual stress and residual stress along the thickness on the members' hysterestic properties. Large factors research has been done, such as width-thickness and thickness of the web and flange. Considering residual stress and lower width-thickness ratio, as the thickness increasing, the percentage of the ductility coefficient reducement is bigger. Considering the accumulative damage and residual stress, thickness of the web and flange has an obvious effect on hysterestic properties, when width-thickness of the web and flange is in a lower range. When thickness is higher than 100 millimeter, as the increasing times of the cyclic loading, the hysterestic loop gets thinner. The stiffness, load-carrying capacity and the ductility coefficient are lower as the thickness being thicker.
引文
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[74]Hashimoto,Tamotsu; Arimochi,Kazushige; Onishi, Kazushi; Bessyo,Kiyoshi; Iiyama, Hideaki; Murayama, Hiroshi. Development of 150 mm thick HT980Z steel plate. Sumitomo Search. 1996(58):56-64
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[2]柴昶,厚板钢材在钢结构工程中的应用及其材性选用,钢结构,2004,19(5)：47-53
[3]陈禄如,中央电视台新台址主楼钢结构用钢特点,钢结构,2007,22(1)：1-4
[4]张永嘉,郑磊,宝钢宽厚板开发研制十年回顾,宝钢钢铁研究所：5-6
[5]陈志鹏,王宗纲,几幢高层钢结构建筑动力特性的实测与分析,工程力学(增刊),2001,286-290
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