Session: DA-07-01 Thermal Stresses and Elevated Temperature Design

Paper Number: 61959

Start Time: Thursday, July 15, 2021, 09:00 AM

61959 - Numerical Investigation on Local Thermal Buckling Behaviours of Buried Large Diameter Heating Pipeline 

The urban infrastructure is an important material basis for the normal operation and sustainable development of the city. The heating pipeline is one of the most important infrastructures of the urban lifeline system. At present, the design of directly buried hot water pipeline is mainly based on the stress failure criterion. Since the large diameter directly buried heating water pipe is subjected to high temperature and high pressure loads, the initial state of the pipeline is in an elsatoplastic state, the stress failure criterion cannot be applied in this case. However, the existing elastic-plastic buckling analysis mainly focuses on the regular analysis, and there is no reliable evaluation index to represent the true limit state of the pipeline. In this paper, a numerical simulation model for thermal buckling analysis of buried large diameter heating pipeline is presented, which takes into account the real geometric configuration and the post-buckling strengthening characteristics of the pipeline. The relationship between key mechanical parameters, such as stress, strain, radial displacement, and the temperature when thermal buckling occurs under different geometric defects is analyzed quantitatively and the mechanical state of pipeline finishing under temperature loading is determined. Combined with the actual service conditions of pipelines in engineering practice, the rationality of the failure criterion of pipeline buckling determined by local buckling theory of thin-shell structure and certain safety conservative coefficient is analyzed. The reliable index of service limit under thermal buckling condition of directly buried heating pipeline is determined.

Presenting Author: Yue Yang China University of Petroleum-Beijing

Authors:

Yue Yang China University of Petroleum-Beijing
Hong Zhang China University of Petroleum-Beijing
Xiaoben Liu China University of Petroleum-Beijing
Weilun Fang China University of Petroleum-Beijing
Lei Sun Beijing Gas and Thermal Engineering Design Institute Co. LTD
Jibei Feng Beijing Gas and Thermal Engineering Design Institute Co. LTD
Mingxu Gao Beijing Gas and Thermal Engineering Design Institute Co. LTD