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

卷:

37卷

期数:

2020年01期

页码:

49-57

栏目:

出版日期:

2020-01-30

文章信息/Info

Title:

Simulation Analysis of Unloading Process of Integral Jacking Steel Roof Reticulated Shell Structure

文章编号:

1673-2049(2020)01-0049-09

作者:

王秀丽¹,陶志山¹,赵海燕²

(1. 兰州理工大学 土木工程学院,甘肃 兰州 730050; 2. 甘肃建投天水建设管理有限公司,甘肃 天水 741000)

Author(s):

WANG Xiu-li¹, TAO Zhi-shan¹, ZHAO Hai-yan²

(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. GCIGC Tianshui Construction Management Ltd., Tianshui 741000, Gansu, China)

关键词:

整体顶升;  生死单元法;  约束方程法;  整体分级同步卸载;  分区分步卸载

Keywords:

integral jacking;  birth and death element method;  constraint equation method;  integrated hierarchical synchronous unloading;  partition and step unloading

分类号:

TU391

DOI:

10.19815/j.jace.2019.01053

文献标志码:

A

摘要:

针对大跨度钢屋盖网壳结构杆系众多、受力复杂,采用整体顶升施工方法时主体结构下方必须设置临时支撑,结构成型后拆除支撑会使结构体系发生重大转变及杆件内力重分布的问题,以天水市体育中心体育馆钢屋盖结构为例,建立精细化有限元模型,对所有节点和杆件按照不同规格分类分别赋予实际质量。利用ANSYS中的生死单元法跟踪模拟顶升施工全过程,以结构完全成型且未拆撑时的状态作为卸载过程的初始状态。采用约束方程法对整体分级同步和分区分步2种卸载方式进行模拟,对比不同卸载方式下所有千斤顶的内力值及应力值较大杆件的应力随卸载步的变化趋势。结果表明:受力复杂的大跨度网壳结构需制定合理的卸载方案并进行模拟分析,确保结构卸载过程的安全; 卸载时支撑处的部分拉杆变为压杆,应引起足够重视; 此类刚性大跨度结构的杆件应力在分区分步卸载过程中对位移变化较敏感,所以要严格控制每一步的卸载位移量; 约束方程法能实现对主体结构和临时支撑脱离再接触过程的真实模拟,为类似工程提供了可靠的卸载分析方法。

Abstract:

Aiming at the problems that the large-span steel roof reticulated shell structure had many rods and complicated forces, temporary support must be set under the main structure when the integral jacking construction method was adopted, and removal of support after the structure was formed would cause significant changes in the structure system and redistribution of internal forces of the rods, a refined finite element model was established for the steel roof structure of Tianshui Sports Center Gymnasium. The actual quality of all joints and rods was given according to different specifications. The life and death unit method in ANSYS was used to track and simulate the whole process of jacking-up construction. The initial state of unloading process was the state when the structure was fully formed and not dismantled. Constraint equation method was used to simulate the two unloading modes, i.e. integrated hierarchical synchronous unloading and separate partition and step unloading. The variation trend of the internal forces of all jacks and the stress of rods with larger stress values under different unloading modes were compared with the unloading steps. The results show that the unloading process of large-span reticulated shell structure with complex loads needs to be reasonably formulated and simulated to ensure the safety of the unloading process; part of the tension rods at the supports become compression rods when unloading, and more attention should be paid to them. The rods stress of such rigid large-span structures is sensitive to the change of displacement in the process of step-by-step unloading, so the unloading displacement of each step should be strictly controlled. The constraint equation method can simulate the real process of disengagement and re-contact between the main structure and temporary support, which provides a reliable unloading analysis method for similar projects.

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备注/Memo

备注/Memo:

收稿日期:2019-01-24
基金项目:国家自然科学基金项目(51778273); 甘肃省住房和城乡建设厅科研项目(JK2018-17)
作者简介:王秀丽(1963-),女,辽宁沈阳人,教授,博士研究生导师,工学博士,E-mail:1135739056@qq.com。

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更新日期/Last Update: 2020-01-13