|Table of Contents|

Study on bending behavior and bearing capacity calculation method of tapered concrete-filled double skin steel tubular members(PDF)

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

Issue:
2025年02期
Page:
67-81
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on bending behavior and bearing capacity calculation method of tapered concrete-filled double skin steel tubular members
Author(s):
WANG Shuhong1;  LIU Xianghong2;  SUN Qing2;  WANG Jiantao3;  ZHANG Linlin1;  CHEN Saihui1
(1. Economic and Technical Research Institute, State Grid Zhejiang Electric Power Co., Ltd, Hangzhou 310008, Zhejiang, China; 2. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China; 3. College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, Shaanxi, China)
Keywords:
tapered concrete-filled double skin steel tubular member;  numerical modelling;  moment distribution mechanism;  theory of section stress integral
PACS:
TU391
DOI:
10.19815/j.jace.2023.04004
Abstract:
Against the large-scale development requirement on support structure of offshore wind turbine, the full-range compression-bending mechanism of tapered concrete-filled double skin steel tubular(CFDST)members was examined under the large hollow ratios and taper degree as well as the out-of-code diameter-to-thickness ratios, where the moment-displacement curves could be divided into four stages, namely the elastic stage, cracking stage, elastic-plastic stage and failure stage. Influence of key parameters on ultimate bearing capacity and stiffness of tapered CFDST was revealed. Based on the section stress integral theory, the calculation method of the compression-bending correlation curve of tapered CFDST members was proposed. The difference of axial force-moment correlation curves calculated by different confined concrete constitutive models was analyzed. The calculation results of the proposed compression-bending bearing capacity formula and the limit state method were compared. The accuracy of the section stress integral theory calculation method was verified. The results show that the taper degree and diameter-to-thickness ratios of double-skin tubes are negatively correlated with the bearing capacity and stiffness. The cross-sectional hollow ratios and axial compression ratios within the limited value are positively correlated with the bearing capacity and stiffness, and inversely, they are negatively correlated. The yield strengths of double-skin tubes and compressive strength of sandwich concrete are positively correlated. The variation of axial force-moment correlation curves can be well described by using the theory of section stress integral, the calculation formula of bending bearing capacity and the limit state method, and it has the advantages of high calculation efficiency and good accuracy. The research results can provide useful reference for the application of tapered CFDST members with large hollow ratios, large taper degree and out-of-code radius-thickness ratio in wind power projects.

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Last Update: 2025-03-20