|Table of Contents|

Research on construction process monitoring on heavy steel truss lifting process of deep pit large-span roof(PDF)

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

Issue:
2023年04期
Page:
41-51
Research Field:
建筑结构
Publishing date:

Info

Title:
Research on construction process monitoring on heavy steel truss lifting process of deep pit large-span roof
Author(s):
ZHOU Yun1; 2;  HU Jinnan1;  ZHU Zhengrong1; 3;  LUO Xianming1
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Hunan Provincial Key Laboratory of Damage Diagnosis for Engineering Structures, Hunan University, Changsha 410082, Hunan, China; 3. Changsha Construction Project Quality and Safety Supervision Station, Changsha 410016, Hunan, China)
Keywords:
large-span steel roof;  heavy truss;  lifting process;  construction safety;  construction process monitoring
PACS:
TU393.3
DOI:
10.19815/j.jace.2022.01038
Abstract:
In order to explore the load conversion mechanism of large-span steel structure roof during construction and ensure the safety of large-span truss structure lifting process, the structural strain monitoring was carried out for the whole process of lifting and installation of single heavy main truss in a deep pit large-span roof structure. By arranging strain sensors at the key sections of the structure, the real strain distribution at the key positions of the structure during the construction process was analyzed to evaluate the safety of the structure during the construction process. Based on the large-scale finite element software ABAQUS, a refined finite element model was established, and the strain response at the structural measuring point after lifting was compared with the strain calculated by the finite element method. The results show that the overall strain response level of the structure during the lifting process is low. After the truss structure is hoisted in place, the strain development of the structure is complicated due to the influence of welding and fixing work, but it is still within the safe range. After the installation is completed, the strain level of the whole structure changes periodically with the temperature rise and fall of the external environment. The stress of the steel plate between the annular stiffening plate and the bottom concrete is the largest, the stress of the middle part of the inner side of the lattice column is too large, the stress of the two ends of the outer side of the lattice column is too large, the stress of the truss part is concentrated in the middle span, and the stress of the two sides is too small, and the internal stiffening plate and the bottom concrete between the lattice column significantly reduce the stress of the key nodes of the structure.

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Last Update: 2023-07-01