|Table of Contents|

Experimental study on shear behavior of new partially encased I-steel composite beams(PDF)

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

Issue:
2023年05期
Page:
69-77
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on shear behavior of new partially encased I-steel composite beams
Author(s):
XIN Li1;  LIU Yuan1;  YAO Yifan2;  HUANG Hua2;  GAO Yue2
(1. China Northwest Architecture Design and Research Institute Co., Ltd, Xi'an 710018, Shaanxi, China; 2. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
new partially encased I-steel composite beam;  shear behavior;  experimental test;  bearing capacity;  calculation method
PACS:
TU398
DOI:
10.19815/j.jace.2021.12124
Abstract:
In order to increase the utilization rate of steel and improve the shear behavior of composite beams, a new type of partially encased I-steel composite beam was proposed. Experimental study on shear behavior of four new composite beams and a contrast I-steel beam under static load was carried out with stud arrangement, shear span ratio and concrete filling amount as parameters, and “force-displacement control” loading method was adopted. The failure mode, shear-rotation curve, shear-strain curve and bearing capacity of the new composite beam and the contrast I-steel beam in the stress process were compared and analyzed. The results show that the composite beam with shear span ratio 1.6≤λ≤2.0 occurs shear compression failure, and the shear span area has the through main oblique cracks. The composite beam with shear span ratio 1.15 occurs tilting pressure failure. Multiple compression short columns are formed in the shear span area, and the concrete is peeled off in large area. When the shear span ratio is reduced from 1.6 to 1.15, the ultimate bearing capacity is increased by 31.8%. The shear capacity of the new composite beam is 33.3% higher than that of the ordinary I-steel beam due to the existence of concrete. The existence of flange studs improves the combined action of composite beam section, so that the concrete can give full play to its compressive capacity. The ultimate shear capacity is increased by 5.8%-29.2%, and the ductility and stiffness of composite beams are also increased. Based on the experimental data and the structural characteristics of the new partially encased I-steel composite beam, the shear capacity calculation formula in the design specification of composite structures is adopted. The calculated values of the formula are in good agreement with the experimental values. The formula can provide some reference for structural design in practical engineering.

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Last Update: 2023-09-01