|Table of Contents|

Research on stress mechanism of concrete tower foundation structure for onshore wind turbine(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年06期
Page:
98-110
Research Field:
建筑结构
Publishing date:

Info

Title:
Research on stress mechanism of concrete tower foundation structure for onshore wind turbine
Author(s):
WU Xiaodong1;  XIAO Shun2;  ZHANG Liuyang1;  ZHANG Rongguo1;  FANG Hao1
(1.POWERCHINA Shanghai Electric Power Engineering Co., Ltd., Shanghai 200025, China; 2. Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China)
Keywords:
concrete tower foundation;  subgrade reaction coefficient;  foundation-spring model;  foundation-reaction model;  finite element method;  tension-bending section
PACS:
TU476
DOI:
10.19815/j.jace.2024.05087
Abstract:
Regarding the problem that setting of a cavity at the center of concrete tower foundation for onshore wind turbines(referred to as “concrete tower foundation”)due to the requirement of prestressed anchoring leads to complex stress in the foundation structure, and relevant specifications had insufficient coverage on the issue, an analytical method for studying the stress mechanism of key sections of concrete tower foundation from the perspective of internal forces based on finite element model was proposed. Two types of finite element analysis models were established, one was the finite element foundation-spring model based on the subgrade reaction coefficient method, and the other was the foundation-reaction model based on the assumption of linear base reaction specified in the specifications. Through the comparison of the analysis results of the two types of models, the rationality of foundation-spring model was verified. The results show that as the subgrade reaction coefficient increases, the base separation zone transforms from a bow shape to a fan shape, the position of the maximum base reaction shifts toward the center of foundation, and the internal forces of the key sections of foundation show a decreasing trend. Each section of the foundation's outer ring slab, cavity bottom slab, ring wall, and corbel bears axial force in addition to bending moment. Among them, the circumferential section of the outer ring slab, the radial and circumferential sections of cavity bottom slab, and the circumferential sections of ring wall and corbel are all tension-bending sections with relatively high tension levels, which is unfavorable to concrete structure. The existing simplified calculation methods cannot consider the axial force of sections, resulting in insufficient reinforcement in tension-bending sections, which should be taken seriously by the engineering community.

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Last Update: 2025-11-25