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

卷:

42卷

期数:

2025年06期

页码:

98-110

栏目:

建筑结构

出版日期:

2025-11-25

文章信息/Info

Title:

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

文章编号:

1673-2049(2025)06-0098-13

作者:

武晓东¹,肖顺²,章刘洋¹,章荣国¹,方浩¹

(1. 上海电力设计院有限公司,上海 200025; 2. 上海市建筑科学研究院有限公司 上海市工程结构安全重点实验室,上海 200032)

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)

关键词:

混塔基础;  基床系数;  基础-弹簧模型;  基础-反力模型;  有限元方法;  拉-弯截面

Keywords:

concrete tower foundation;  subgrade reaction coefficient;  foundation-spring model;  foundation-reaction model;  finite element method;  tension-bending section

分类号:

TU476

DOI:

10.19815/j.jace.2024.05087

文献标志码:

A

摘要:

针对陆上风机混凝土塔筒基础(简称“混塔基础”)结构因预应力锚固要求而在基础中心设置空腔造成基础结构受力复杂,以及规范对此覆盖不够完善的问题,提出了基于有限元模型从内力视角开展混塔基础关键截面受力机理的分析方法。建立了两类有限元分析模型,一类是基于基床系数法的有限元基础-弹簧模型,另一类是基于规范基底线性反力假定的基础-反力模型。通过两类模型分析结果的对比,验证基础-弹簧模型的合理性。结果表明:随着基床系数的增加,基底脱开区由弓形向扇形转变,基底最大反力位置向基础中心移动,基础关键截面内力呈减小趋势; 基础外环板、空腔底板、环壁以及牛腿各截面除承受弯矩外,还承受轴向力,其中外环板环向截面、空腔底板径向和环向截面、环壁和牛腿环向截面均为拉-弯截面且拉力水平较高,对混凝土结构不利; 现有简化计算方法无法考虑截面轴力,致使拉-弯截面配筋不足,需引起工程界重视。

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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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-05-21
基金项目:中国电力建设股份有限公司科研项目(DJ-ZDXM-2021-14); 上海市青年科技启明星计划资助项目(22QB1403400)
作者简介:武晓东(1986-),男,工学博士,高级工程师,E-mail:wuxd@sepd.com.cn。

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更新日期/Last Update: 2025-11-25