基于有限元法的成品PCCP外压试验机分析研究

Analysis and Research of PCCP External Pressure Testing Machine Based on Finite Element Method

在众多预应力钢筒混凝土管(简称PCCP)输水工程中,为检验PCCP的抗裂性能,满足埋置在一定深度处的PCCP的安全性,保证输水工程的质量,提供了一种适用于管径DN1400~DN4000,公称长度L=5000或6000 mm,能自动记录、存储试验数据及打印试验时程曲线的新型成品PCCP外压试验机,以用于标准规格PCCP出厂前抗裂性能抽样检验或新设计PCCP定型抗裂试验。简述此设备的组成、原理控制及操作使用流程,基于Hypermesh19.0有限元分析软件为前处理软件进行建模、划分网格及其利用OptiStruct2019求解器作为后处理软件,分析了此成品外压试验机的金属结构强度、刚度及总载荷3500 kN工况下的稳定性问题,分析得到该设备结构局部最大应力在261 MPa,最大变形17.8 mm,线性屈曲特征值为13.8,表明该成品PCCP外压试验机满足使用要求。该新型外压试验机所设计的结构参数,所采用的电气控制原理和分析方法可为类似外压试验机的设计、控制及分析验证提供参考和借鉴。

In many prestressed steel cylinder concrete pipe(PCCP)water conveyance projects,in order to test the crack resistance of PCCP,meet the safety of PCCP buried at a certain depth and ensure the quality of water conveyance projects,a method suitable for pipe diameter DN1400~DN4000,nominal length L=5000 or 6000mm,which can automatically record.A new finished product PCCP external pressure testing machine for storing test data and printing test time history curve was used for sampling inspection of anti crack performance of standard PCCP before delivery or type anti crack test of newly designed PCCP.The composition,principle,control and operation process of the equipment were briefly described.Based on Hypermesh 19.0 finite element analysis software was the pre-processing software for modeling and meshing.Using Optistruct 2019 solver as the post-processing software,the strength,stiffness and stability of the metal structure of the finished external pressure testing machine under the working condition of 3500 kN were analyzed.The analysis shows that the local maximum stress of the equipment structure is 261 MPa,the maximum deformation is 17.8 mm,and the characteristic value of linear buckling is 13.8.It shows that the finished PCCP external pressure testing machine meets the application requirements.The structural parameters,electrical control principles and analysis methods adopted by the new external pressure testing machine can provide reference for the design,control,analysis and verification of similar external pressure testing machines.