|Table of Contents|

Sectional Optimization of Round-ended Rectangular Concrete-filled Steel Tubular Columns Under Eccentric Compression(PDF)

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

Issue:
2021年04期
Page:
1-12
Research Field:
Publishing date:

Info

Title:
Sectional Optimization of Round-ended Rectangular Concrete-filled Steel Tubular Columns Under Eccentric Compression
Author(s):
REN Zhi-gang;  XU Sheng-hai;  LI Pei-peng;  LIU Chuang
(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
RRCFST;  sectional optimization;  aspect ratio;  bearing capacity;  envelope curve
PACS:
TU398
DOI:
10.19815/j.jace.2020.08031
Abstract:
In order to study the sectional optimization method of round-ended rectangular concrete-filled steel tubular(RRCFST)columns, the finite element model was established by using ABAQUS based on the idea of concrete partition that the round-ended rectangular section of concrete was divided into middle rectangle and two semi-circular cross-sections for using different concrete constitutive relationships, the simulation results were compared with the test results of 13 RRCFST stub columns, and the rationality of the model was verified. Then three groups of 462 RRCFST column models were set up by using the finite element modeling method, under the condition that the strength and amount of concrete and steel of each model in each group were constant, the influence of aspect ratio on load bearing capacity of RRCFST column under compression was studied in detail. The relationship between the straight line part of the axial compression-bending moment(N-M)failure curve of RRCFST column and the aspect ratio was analyzed by finite element method, and the applicability of the design method of concrete-filled steel tubular(CFST)members under eccentric compression proposed by GB 50396-2014 for RRCFST stub column members was further verified. According to the design method of eccentric compression RRCFST members and assuming that the strength and amount of concrete and steel were constant, the N-M failure load envelope curve expression of RRCFST members based on level of material strength and amount was derived by using the eccentric pressure checking formula. The bearing capacity checking method of RRCFST stub column under eccentric compression based on level of material strength and amount, and the calculation method of aspect ratio that meeting the bearing requirements were both proposed, which provided the reference for sectional optimization research and engineering application. The results show that the N-M failure load envelope curve of RRCFST short column consists of a straight line segment and two curved segments under the condition that the material strength and dosage remain unchange. After deriving the expression of the envelope curve, it can directly calculate and judge whether the material is sufficient or not in the process of component design, and calculate the optimal section size of the component.

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Last Update: 2021-07-10