风电塔筒法兰焊接变形控制的工艺措施

风力发电塔架法兰焊接时需要控制三个指标：法兰平面度、法兰角变形（即内倾量）、法兰椭圆度。在焊接过程中采取相应的工艺措施保证这三个指标,具有重要的经济效益。本文重点介绍了法兰焊接变形成因及焊接变形控制措施等,且该方法在实践中得到广泛应用,取得很好的效果。     

波导法兰连接的无源互调分析与测量

在卫星通信系统中,非铁磁性微波无源器件的无源互调(PIM)问题非常严重,产生PIM的根源在于天线、波导法兰等无源器件的非线性效应,例如场发射、量子隧穿、热电子发射、电致伸缩、微放电等[1]。文中通过对波导法兰无源互调模型的分析和测量,得出波导间接触压力越大,各阶PIM越小;PIM阶数越高,载波功率之比对其影响越大。     

Elastic shear buckling characteristics of LiteSteel beams

LiteSteel beam (LSB) is a new cold-formed steel hollow flange channel beam. The unique LSB section is produced by a patented manufacturing process involving simultaneous cold-forming and dual electric resistance welding. To date, limited research has been undertaken on the shear buckling behaviour of LSBs with torsionally rigid, rectangular hollow flanges. For the shear design of LSB web panels, their elastic shear buckling strength must be determined accurately including the potential post-buckling strength. Currently the elastic shear buckling coefficients of web panels are determined by assuming conservatively that the web panels are simply supported at the junction between the flange and web elements. Therefore finite element analyses were carried out to investigate the elastic shear buckling behaviour of LSB sections including the effect of true support conditions at the junction between their flange and web elements. An improved equation for the higher elastic shear buckling coefficient of LSBs was developed and included in the shear capacity equations of Australian cold-formed steel codes. Predicted ultimate shear capacity results were compared with available experimental results, both of which showed considerable improvement to the shear capacities of LSBs. A study on the shear flow distribution of LSBs was also undertaken prior to the elastic buckling analysis study. This paper presents the details of this investigation and the results including the shear flow distribution of LSBs.     

带颈承插焊法兰应力分析

对于带颈承插焊法兰目前还没有一套较完整的计算方法.本文以弹性理论为基础导出一套应力计算公式,并经实验验证了公式的可靠性,可供工程设计参考使用.     

液态模锻钢平法兰裂纹分布及其生成机制

本文通过钢平法兰液态模锻件裂纹分布及其组织形貌的观察,理论分析和揭示了液态模锻钢平法兰的生成机制,为工艺过程正确建立,提供了理论依据。     

钢管塔锻造法兰连接螺栓的受力计算

针对钢管塔构件法兰连接形式,以真型试验和理论分析为研究方法,提出输电线路钢管塔用锻造法兰连接中螺栓的计算公式和相关构造要求,并分析了锻造法兰螺栓受力影响因素。目前该公式和构造要求已应用于1 000 kV淮南-上海（皖电东送）输变电工程钢管塔的锻造法兰设计。     

常用钢制管法兰标准的分析与归纳

在将我国常用钢制管法兰主要标准(GB、JB、HG、SH)划分为欧洲和美洲两大体系基础上，分析和归纳了各种法兰类型及密封面形式所适用的压力等级和公称通径范围及连接尺寸等，同时也简单地介绍了与钢制管法兰相配套的常用垫片的种类及所适用的范围。     

带翼缘剪力墙截面曲率分析及延性的计算

通过对非对称截面带翼缘剪力墙的弯矩-曲率分析,分别计算了翼缘受拉和翼缘受压方向的截面屈服曲率和极限曲率,分析了轴压比、纵筋配筋率、腹板竖向分布钢筋配筋率、翼缘宽度与腹板高度比、混凝土强度、配箍特征值、腹板截面高厚比对截面曲率的影响,并结合受压区高度的变化详细阐述了截面曲率随各影响因素的变化规律。通过对4941个工况下计算结果的回归分析,建立了带翼缘剪力墙截面屈服曲率和极限曲率的简化计算公式,并进一步推导了曲率延性和位移延性的计算公式。通过与试验结果的比对,验证了计算公式的准确性。该文公式不仅将翼缘受拉和翼缘受压状态进行了区分,并择取了影响截面曲率的关键因素,可为带翼缘剪力墙的变形能力计算以及基于位移的抗震设计提供依据。