基础锚栓预埋加固方案

结合工程实例 ,介绍轻钢结构系统基础锚栓预埋、加固解决方案 ,并介绍了加固系统的制作及使用方法 ,可供工程人员参考     

Prying Force Calculation and Design Method for T-shaped Tensile Connector with High Strength Bolt

In order to establish the design method for T-shaped tensile connector with high strength bolt,the theoretical analysis is carried out. Firstly,it analyzes the performance of the connector and establishes prying force calculation model. Based on the model,prying force equation and function between bolt prying force and flange thickness is derived,and the min and max thickness requirement of flange plate under a certain tension load is then obtained. Finally,two simplified design methods of the connector are proposed,which are bolt pulling capacity method and flange plate bending capacity method.     

某特大简支梁桥墩身开裂的事故排查

桥梁裂缝严重影响结构安全性和耐久性,不符合“绿色建造”和“可持续发展”的相关理念。文章对某特大简支梁桥桥墩开裂现象进行事故排查,为裂缝修复工作提供依据,以促进桥梁施工各个环节的规范化。考虑支座中未拆除的临时连接螺栓对墩、梁的约束作用,首先以Abaqus分析未拆除的临时连接螺栓对支座水平剪切变形的约束作用,然后以Midas计算了3种最不利工况下桥墩墩顶处的支座反力,最后以ANSYS分析3种最不利荷载组合时墩身应力。结果表明,即使按墩顶的4个纵向活动支座临时连接被同时破坏的最不利情况考虑,墩身在3种最不利工况下的最大主拉应力也仅为0.08 MPa,远未达到C30混凝土的拉应力容许值0.73 MPa。因此,架梁完成后未及时拆除支座临时连接的限位螺栓并不是导致该桥墩身开裂的主要原因,事故调查需从其他方面入手。但该疏忽会在桥墩中引起拉应力,应尽量避免,确保桥梁建造的各个环节更为规范。     

Developing a Higher-Cycled Product Design CAE Model： The Evolution of Automotive Product Design and CAE

To help corporations survive amidst worldwide quality competition, the authors have focused on the strategic development of a higher-cycled product design CAE model employing a highly reliable CAE analysis technology component model. Their efforts are part of principle-based research aimed at evolving product design and CAE development processes to ensure better quality assurance. To satisfy the requirements of developing and producing high quality products while also reducing costs and shortening development times, the effectiveness of this model was verified by successfully applying it to the technological problems of loosening bolts and other product design bottlenecks at auto manufacturers.     

树状柱框架中钢梁拼接的抗震设计有限元模拟对比

为了比较树状柱钢框架中各种钢梁拼接设计的抗震性能,对几种常用的拼接设计进行了有限元滞回性能的模拟对比分析。分析采用三维三重非线性有限元,完全考虑了螺栓预拉力、螺栓头(帽)与板的相互作用、螺栓杆与孔壁的相互挤压作用、接触面的摩擦作用。结果表明,按照拼接区的实际受力进行设计,不仅拼接用料和施工用时较少,而且抗震性能有所提高。     

机械设计基础教学中值得商榷的几个问题

对机械设计基础课程教学中存在的几个理论问题提出不同见解,主要包括:瞬心概念中关于两构件上任意重合点的相对速度方向与瞬心和此点连线关系的推导;螺旋副的效率问题;受横向载荷的普通螺栓联接预紧力的计算问题。     

基于AutoCAD机械设计标准件库的建立

在机械设计中,标准件的使用比较频繁,但是在AutoCAD平台下却没有可以直接绘制标准件的命令。对此问题,以螺栓为例讨论了如何方便快捷地画出标准件,同时阐述了数据库和程序库的建立和连接过程。     

Studies on the potential risk of liquid metal assisted cracking (LMAC) in normal‐temperature and high‐temperature hot‐dip galvanizing of high strength bolts of dimensions greater M24

Liquid metal assisted cracking (LMAC) mainly occurs due to an unfavorable interaction of three factors: a susceptible material condition, presence of a liquid metal and sufficient tensile stress. Hot‐dip galvanizing of high‐strength bolts induces high thermal loads in bolts made of tempered steel in the presence of a zinc melt and thus, provides the boundary conditions for the above mentioned critical factors to interact. The focus of this study is on investigating thermally‐induced stresses in large diameter bolts and their impact on the formation of liquid metal assisted cracking (LMAC). In order to calculate the thermal loads in hot‐dip galvanizing, simulations were carried out regarding the thermo‐mechanical behavior of bolts during the hot‐dip galvanizing process. The simulations illustrate that cracks are most likely to occur in the first thread turn. This prediction is confirmed by experimental observations.     

哈西客运综合交通枢纽工程型钢混凝土组合结构梁柱施工技术

结合哈西客运综合交通枢纽工程公路客运工程,详细介绍了工程中型钢混凝土组合结构梁柱施工技术,包括预埋地脚螺栓施工,承台基础柱混凝土浇筑,型钢柱焊接,柱脚灌浆料施工,型钢梁柱吊装,型钢梁柱主筋施工等.本工程应用型钢混凝土组合结构梁柱技术,在满足设计和施工质量要求的同时,还提高了施工效率、降低了施工成本.