|Table of Contents|

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

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

Issue:
2020年01期
Page:
49-57
Research Field:
Publishing date:

Info

Title:
Simulation Analysis of Unloading Process of Integral Jacking Steel Roof Reticulated Shell Structure
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)
Keywords:
integral jacking;  birth and death element method;  constraint equation method;  integrated hierarchical synchronous unloading;  partition and step unloading
PACS:
TU391
DOI:
10.19815/j.jace.2019.01053
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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Last Update: 2020-01-13