|Table of Contents|

Mechanical properties of steel-composite slab composite beams with new type angle steel connection under negative bending moment(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年4期
Page:
68-81
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Mechanical properties of steel-composite slab composite beams with new type angle steel connection under negative bending moment
Author(s):
DING Ke-wei1; 2;  FANG Shang-jing1; 2;  JIA Gao-zong1; 2;  ZAHNG Xing-chen1; 2
(1. Anhui Provincial Key Laboratory of Building Structure and Underground Engineering, Anhui Jianzhu University,Hefei 230601, Anhui, China; 2. College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China)
Keywords:
bridge engineering;  steel-composite slab composite beam;  static test;  angle steel;  mechanical performance;  stiffness
PACS:
U448.218
DOI:
10.19721/j.cnki.1671-8879.2023.04.008
Abstract:
A new type of angle steel connector embedded in steel-composite slab composite beams was proposed to investigate the stress performance of the assembled steel truss composite slab composite beams under negative bending moment load, while considering the inconvenience and safety hazards brought by the traditional precast bottom plate rib form for transportation and on-site construction. A reverse static loading test was conducted to compare and analyze the crack development, failure mode, interface slip law, strain along the height of the loading point, and load-deflection variation at the mid-span section and 1/4 span section of the steel-composite slab composite beams with the embedded new type of angle steel connector and the traditional precast bottom plate rib form. An applicable method for calculating the pre-crack stiffness of steel-composite slab composite beams was proposed based on the results of different calculation methods. The influence of different composite slab longitudinal reinforcement ratios and new type of angle steel connector sizes on the stress performance of steel-composite slab composite beams was analyzed by ABAQUS finite element software. The results show that the steel-composite slab composite beams with the embedded new type of angle steel connector have a similar failure mode to those of the traditional precast bottom plate rib form, which is bending-vertical shear failure. Both types of composite beams have similar bending capacity, but the new type of composite beams have higher bending stiffness and better synergistic deformation capacity. The longitudinal reinforcement ratio of the composite slab and the size of the new type of angle steel connector have an impact on the stress performance of the steel-composite slab composite beams. Increasing the longitudinal reinforcement ratio and the length of the new type of angle steel connector can improve the bearing capacity and stiffness of the steel-composite slab composite beams. However, the height of the new type of angle steel connector has no significant effect on the steel-composite slab composite beams. By comparing different formulas for calculating the pre-crack stiffness of the steel-composite slab composite beams, it is found that the tensile resistance of concrete and the slip effect between the steel beam and concrete should be considered when calculating the pre-crack stiffness of steel-composite slab composite beams. The calculated results shows a good agreement with the experimental results.7 tabs, 18 figs, 35 refs.

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Last Update: 2023-08-20