|Table of Contents|

Analysis of Cracking of Concrete Floor Slabs in Steel-tube-bundle Structure(PDF)

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

Issue:
2021年01期
Page:
107-116
Research Field:
Publishing date:

Info

Title:
Analysis of Cracking of Concrete Floor Slabs in Steel-tube-bundle Structure
Author(s):
QIAN Kuang-liang;  CHENG Peng-yun;  ZHANG Li-feng;  QIAN Xiao-qian
(College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China)
Keywords:
steel-tube-bundle structure;  concrete floor slab;  modeling analysis;  crack;  reinforcement
PACS:
TU398
DOI:
10.19815/j.jace.2020.05049
Abstract:
In light of the cracking problems of cast-in-situ concrete floor slabs in the concrete-filled steel-tube-bundle shear wall structure(steel-tube-bundle structure), the finite element analysis and research were conducted to find out the causes of cracking of floor slabs, and the preventive suggestions were provided. According to the characteristics of the steel-tube-bundle structure different from the concrete structure, a set of finite element modeling methods for the steel-tube-bundle structure different from the traditional design methods were established by using ANSYS, and the finite element modeling analysis was carried out according to the actual engineering design file. The results show that in the normal use stage, the location of larger biaxial stress is concentrated near the transverse and longitudinal load-bearing members on the floor slab surface, and is mainly concentrated on mid-span at bottom of floor slab. In the construction stage, considering the impact of the weight of floor slab, temperature changes and concrete shrinkage, the maximum tensile stress at the bottom of floor slab occurs near the load-bearing members such as concrete-filled steel-tube-bundle shear walls. The stress cloud diagram of the floor has a high consistency with the crack distribution on site, which indicates that the proposed modeling methods can better reflect the stress of the floor slab in the steel-tube-bundle structure. According to the reinforcement check results of the cracked floor slab, it is recommended to increase the amount of reinforcement in the grid around the concrete-filled steel-tube-bundle shear walls and the concrete-filled steel-tube columns.

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Last Update: 2021-01-20