【作者】 曲晨；

【导师】 金伟良；

【作者基本信息】 浙江大学 ， 结构工程， 2002， 博士

【摘要】 随着电力工业建设的迅速发展，钢材的用量急剧增长，为此，国家计委，原水电部和能源部一再强调在输变电工程建设中，应从严掌握自立式铁塔的建设。然而，一般的钢筋混凝土电杆或与预应力混凝土电杆，较普遍地存在着纵向裂缝问题，严重影响了高压输电线路的安全运行及其使用寿命，已不能适应高压输电杆塔和变电构架的要求。为此，经过多方面的综合分析和比较，认为采用离心成型的环形钢管混凝土电杆代替传统的钢筋混凝土电杆，是一种比较理想的结构型式。因此，离心钢管混凝土结构的研究具有重要的现实意义。 在电力工程结构中，由于使用功能要求，许多结构中不同程度地存在着受扭工作状况，及弯扭、剪扭联合作用工作状况，然而迄今为止，国内外对离心钢管混凝土结构的工作性能的研究大多局限在单一荷载工况情况下，尚未见组合荷载作用的研究，因此，能否深入了解离心钢管混凝土构件的扭转和在组合作用下的受力特性，成为影响该结构形式能否进一步推广应用和发展的关键技术问题。 针对这种情况，本文进行了一系列的试验及理论研究。1999年浙江省电力设计院结合500kV杭东变电所工程与浙江大学结构工程研究所合作开展了“离心钢管砼结构抗扭性能的试验研究”。试验中，为保证扭转及弯矩荷载施加的合理性，在浙江大学工程结构试验室原有的加载设备的基础上，分别采用在扇形板边缘施加切向力和宽轴承滚轴加载的方法，改造并调试出一套可专门用于大吨位构件施加扭转荷载及组合作用的试验设备，并利用这套设备进行了离心钢管混凝土构件在不同弯扭比的组合作用下的试验研究。 本文根据不同参数的构件受扭性能试验结果，研究了该结构受力变形全过程的基本规律，提出了受钮全过程的三个工作价段，即弹性变形阶段，弹塑性变形阶段和极限破坏阶段，经分析回归得到扭转全过程弹塑性的简化分析方法及承载力计算公式，可供工程设计参考；同时根据本文的弯扭试验结果以及对离心钢管混凝土构件进行的理论分析，推导了弯扭试验相关承载力的关系。 本文利用弹性理论对扭转、弯曲、剪切、弯扭联合作用、剪扭联合系列作用下的构件弹性应力分布进行了研究，得出应力分布与主要物理和几何参数的规律；同时引入混凝土及钢的强度准则，得出了弯扭、剪扭复合应力作用下的承载力相关关系的理论方程，可供工程设计使用。摘翌 浙汀大学工学＊士学位论文2002 问时，首次利用塑性全量理论及势能原理进行了构件弹塑性扣转刚度的全过程分析，得到弹塑性扭转刚度的理论分历方法，并与试验结只进行了比较，分析结果良好，说明利用这种力法可以较好的进行扭转弹塑性刚雀的粘确分析。 本文首次分析了扭转作用下的螺旋斜向加劲壳的塑性稳定性问题，还根据试验观象的观察，对构件在塑性极限时的状态，简化为内壁衬朽螺协刹向加劲混凝土肋的薄壁钢管的塑性稳定问题，利用塑性壳体稳定理论进行了探讨。 对在扭转及弯扭荷载作川厂的不同参数的构件，进行了三维抑塑性有限元的分析，并与试验的相应结果进行了对比，有限元分析的精度良好，说明采用有限元方洽来分析离心钢管地渝卜结构足一卞11。有效可行的方壮，为该构件进一步进行体系受力的数值分析奠定了基础。 本文的主要研究成果己经应用于实际工程的使用，并通过了浙江省科技厅组织的专家鉴定会，其成果己达到国际先进水平。更多还原

【Abstract】 In view of the rapid development of electric undertaking and a sharp increase of steel products consumption,the State Development Planning Commission,the former State Water Resources and Hydropower Ministry and State Energy Ministry have been urging that the building of steel towers should be strictly controlled in the construction of transformer substations;and warning that the need of the present 500kv power transmission and transformer trusses can hardly be satisfied by ordinary steel and concrete electric poles or prestressed concrete poles,which have endangered the operation and longevity of the high voltage transmitting line due to the common problem of cracks by gravity. On the basis of comprehensive analyses and studies,now the centrifuge concrete filled thin- walled steel tubular is regarded as one of the ideal substitutes of the traditional concrete poles,and there has been a practical call for the researches on itUnfortunately,present evidence is all for the capabilities of the tube under single load but there is hardly any datum relating to those under the combined loads of bending and shearing torsion that many members applied in electric power projects inevitably bear to different extent.This paper intends to improve this situation with the experimental researches and related theoretical analyses done on the subject. As a result of growing need,in 1999,the research on capabilities of the centrifugal concrete filled thin-walled steel tubular under tension and torsion was started by Zhe Jiang Electric Power Design Institute and the Civil Engineering Department of Zhe Jiang University. This research was also supposed to provide a valuable reference for the construction of 500kV Eastern HangZhou transformer substation project. To guarantee the rationality of the torsion and bending load application,a set of experimental equipments was transformed from a traditional one by exerting tangential force on the brim of the fan board and conducting broad-billed roller application. In the actually fulfilled experiments on the capabilities of the members under different ratios of torsion and bending,the equipments proved to be well qualified in load applying to large-tonnage members. And the theoretical analyses done in this paper are listed below:First,the experimental data on the members of varied parameters under torsion demonstrate the general rule of the deformation while the tubular is under torsion. Thepaper establishes three phases of the deformation of the tubular under torsion,namely,the elastic deformation,the elastic-plastic deformation,and ultimate failure. Through regression analysis,a simplified method is proposed for calculating the capabilities of the tubular under elastoplastic torsion,and the formulary for bearing value,is also recommended as a reference in engineering design. Besides,on the basis of the test data under bending and torsion and the theoretical analysis on the tubular,the relative relationship between the bearing values is derived.Second,based on the elastic theory,this paper deduces the rules of stress distribution and main physical and geometric parameters by analyzing the elastic stress distributions when the tubular is under such conditions as torsion,bending,shearing,combined bending and torsion,and combined shearing and torsion;additionally,taking the strength criteria of concrete and steel as reference,the paper proposes a set of theoretic equations for the relative relationship between the bearing values.Third,a theoretic approach based on total theory of plasticity is for the first time applied to analyze elastoplastic torsion rigidity of the tubular,and the results are well proved by the test data.Also for the first time,the plastic stability of the spiral skew stiffening shell is studied. It is shown in the experiments that there is the comparability between the stability of the members at plastic limit and that of the thin-shelled steel tubular with the spiral skew stiffening concrete rib. Therefore the author addressed the stability of the me更多还原