自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第1期    总第305期    2020年1月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)01-0248-13
长江下游地区倒Y形混凝土桥塔的三维日照温场及其效应
顾斌,谢甫哲,钱海,雷丽恒

(江苏大学 土木工程与力学学院,江苏 镇江,212013)

摘 要: 以长江下游某大跨斜拉桥的倒Y形混凝土桥塔为例,基于传热学、气象学和计算机几何图形学等理论,建立倒Y形混凝土桥塔的三维日照温度场及其效应的有限元模型,对桥塔的三维日照温度场及其效应进行研究。研究结果表明:桥塔南北塔壁和东西塔壁的外表面最大温差分别可达13.1 ℃和10.4 ℃,超过规范的推荐值(推荐值为±5 ℃);东南西北各塔壁沿壁厚方向上的最大温差分别可达14.5,18.2,16.8和7.8 ℃,且温度沿壁厚方向近似呈指数形式分布,北塔壁和其他三面塔壁的衰减系数分别处于3.1~3.5和4.1~5.0之间;桥梁走向为南北时,塔顶纵横桥向的最大位移分别可达132.3 mm和8.7 mm,桥梁走向为东西时,塔顶纵横桥向的最大位移分别可达51.4 mm和25.7 mm;不论桥梁走向是东西还是南北,桥塔纵桥向和横桥向的温度应力均超过C50混凝土的抗拉强度设计值1.83 MPa,与其他荷载组合时可能会使桥塔开裂,故建议在塔壁内外表面以及截面突变部位多布置一些钢筋或钢筋网片。

 

关键词: 倒Y形混凝土桥塔;温度场;温度效应;光线跟踪算法;有限元模型

3D-temperature field and its effect of inverted Y-shaped concrete pylon in lower Yangtze region
GU Bin, XIE Fuzhe, QIAN Hai, LEI Liheng

Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China

Abstract:Taking an inverted Y-shaped concrete pylon of one long span cable stayed bridge in the lower Yangtze region as example, a finite element model that can accurately simulate the 3D-temperature field and its effect of the pylon was built by using the theories of heat transfer, meteorology, computer graphics, and so on. Based on the model, the 3D-temperature field and its effects on the pylon were studied. The results show that the maximum temperature differences between out surface of southern wall and northern wall and between out surface of eastern wall and western wall can reach 13.1 ℃ and 10.4 ℃, respectively, and are all much larger than the value recommended by the code (recommended value is ±5℃). The maximum temperature difference along the thickness of eastern, southern, western and northern wall can reach 14.5, 18.2, 16.8 and 7.8 ℃, respectively. The temperature distributions along the thickness direction are all close to exponential, and the attenuation coefficients of northern wall and the other three walls are 3.1-3.5 and 4.1-5.0, respectively. The maximal displacement of pylon top in longitudinal and lateral directions can reach 132.3 mm and 8.7 mm, respectively, when the bridge is in south-north direction, and can reach 51.4 mm and 25.7 mm, respectively, when the bridge is in east—west direction. No matter whether the bridge in south—north direction or in east—west direction, the maximum longitudinal and transverse tension stresses all exceed 1.83 MPa which is the tensile strength design value of C50 concrete. When the tensile stresses combined with other actions cause pylon cracks, a certain amount of reinforced net should be arranged inside and outside pylon wall and mutation part of cross section to control the cracks.

 

Key words: inverted Y-shaped concrete pylon; temperature field; temperature effect; ray-tracking technology; finite element model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号