|Table of Contents|

Prediction procedures for long-term behavior of double-span steel-concrete continuous composite beams considering shrinkage and creep effects(PDF)

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

Issue:
2023年02期
Page:
50-58
Research Field:
建筑结构
Publishing date:

Info

Title:
Prediction procedures for long-term behavior of double-span steel-concrete continuous composite beams considering shrinkage and creep effects
Author(s):
WANG Qinghe1; 2;  WANG Shiqi1;  GU Fan1;  YOU Guangdi1;  DAI Ruihong1
(1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China; 2. Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China)
Keywords:
steel-concrete composite beam;  long-term behavior;  prediction procedure;  shrinkage;  creep
PACS:
TU398.9
DOI:
10.19815/j.jace.2021.10033
Abstract:
To investigate the influence of concrete shrinkage and creep on the long-term behavior of multi-span steel-concrete continuous composite beams and propose the corresponding prediction procedures, the applicability of typical composite beam design procedures was evaluated based on the existing long-term test results of two-span continuous composite beams. On this basis, considering the comprehensive effects of concrete shrinkage and creep based on the age-adjusted effective modulus(AEMM)method, cracking and relative slip at the interface of composite beams, formulas for calculating the mid-span support bending moment and deflection of two-span continuous composite beams were proposed. The reliability of the prediction procedure was verified by the long-term test results. Furthermore, the effects of different concrete flange slab types(shrinkage and creep distribution models)on the long-term behavior of composite beams were compared. The results show that the proposed long-term behavior calculation formula for two-span continuous composite beams can effectively predict the mid-span support bending moment distribution and deflection of composite beams with the maximum error between the calculated and measured results of 25.3%, which considers the features of concrete creep by AEMM method, the additional bending moment caused by shrinkage, and the effects of concrete cracking and interface slip by reduction stiffness. The shrinkage deformation of concrete has a significant impact on the long-term behavior of composite beams. When the shrinkage deformation of concrete is not considered, the mid-span support bending moment and deflection of composite beams are only 41.1% and 60.6% of the test values, respectively. Different shrinkage and creep models should be used according to the type of floor slab when designing the long-term behavior of composite beams. The uniform shrinkage and creep models should be used for reinforced concrete floor slabs, and the non-uniform shrinkage and creep models should be used for composite floor slabs.

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Last Update: 2023-03-20