参数化节点法建模在海上升压站钢结构模块中的应用研究

在钢结构模块中存在着大量的梁柱节点,节点的建模效率决定了钢结构加工设计建模的效率。以江苏某海上风电场项目海上升压站钢结构模块为例,结合Tekla软件,重点论述参数化节点建模的方法:包括创建任意固定梁高的节点板、建立自定义节点、对自定义组件进行参数化设置等步骤;在对海洋工程加工设计中常用的3种节点建模方法即复制修改法、软件自带组件法、自定义组件库法进行对比的基础上,阐述了采用参数化节点建模的优势,指出采用参数化节点法可以极大地提高建模效率和准确率,且在以后类似的工程节点建模中,可以重复应用此次制作的参数化节点。

RESEARCH OF THE PARAMETRIC ASSEMBLY METHOD

The parametric part assembly generation method is presented. Based on the parametric part generated by means of constructive-element, through interactively inputting the relationships of the location and the assembly, and by compiling operations like movement and rotation, the assembly drawing is created so as to implement the occurrence of the parameterizations of the assembly and the part drawing. The data structure of the assembly part and the key technologies of hidden line removal in the implementation of assembly process, etc. , are described in detail.

3D structure parameterization design and modeling for irregular structure of stope bottom

Stope mining design is a very important and complicated task in daily production design and technical management of an underground mine.Based on workface technology and human-computer interaction technology,this study introduces a method of 3D parametric design for the irregular structure of stope bottoms,and focuses on solving technical problems in surface modeling of stope bottom structure.Optimization of the minimum span length algorithm(MSLA) and the shortest path search algorithm(SPSA) is conducted to solve the problem of contour-line based instant modeling of stope bottom structures,which makes possible the 3D parametric design for irregular structure of stope bottom.Implementation process and relevant methods of the proposed algorithms are also presented.Feasibility and reliability of the proposed modeling method are testified in a case study.In practice,the proposed 3 D parameterization design method for irregular structure stope bottom proves to be very helpful to precise 3D parametric design.This method is capable of contributing to improved efficiency and precision of stope design,and is worthy of promotion.

Parametric Modeling of Static Three-Dimensional Problem of Buried Pipeline through the Coupling between a Finite Cylindrical Shell Element and Special Boundary Elements

This work deals with an application in parametric modeling of problems regarding pipelines buried in static system, written in C＋＋ using ObjectARX functions. The application is fully integrated with AutoCAD through saproms.dll and saproms.arx libraries where the stages of pre-processing, processing and post-processing are done in AutoCAD sotlware environment itself without having to export data to another processing environment. The analysis processing is done by functions whose algorithms are based on the solution of the coupling between the FEM （finite element method） and the BEM （boundary element method）. The representation of the homogeneous pipeline is made by the FEM using a finite element in the form of a cylindrical panel called CYS （cylindrical shell）, developed from the homogeneous isotropic model proposed initially by Djoudi Bahai, who uses the philosophy of the assumed deformation model （assumed strain based model）. The soil is taken to be a continuum infinite or semi-infinite elastic solid patterned by BEM where special boundary elements are proposed with curved surface or curved edges to represent the soil-structure interaction mainly in the areas of contact with the pipeline.

山区高墩T梁桥桥墩价值工程研究

为实现山区高墩T梁桥桥墩的优化设计，引入价值工程理论，采用多元优化法及参数化建模手段对20～100m高度的多种桥墩进行承载能力分析与优化研究，得到了满足二类稳定要求的墩型合理截面尺寸，并进行相应的桥墩抗推刚度规律及经济性能规律分析。在此基础上，以桥墩抗推刚度标准差为性能指标，桥墩总造价为经济指标进行组合，实现厦蓉线贵州境内多座桥梁的桥墩价值评估。研究结果表明：对于分幅的山区高墩T梁桥，桥墩高度为20～40m范围采用双柱实心墩，桥墩高度为40～70rn随高度变化采用单柱实心墩或单柱空心墩，桥墩高度为70～100m范围采用单柱空心墩时桥梁结构性能表现最优、经济性能最好，桥墩价值达到最大化。