|Table of Contents|

Parameter analysis of seismic behavior and bearing capacity calculation of reinforced concrete columns with stay-in-place UHPC formwork(PDF)

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

Issue:
2025年01期
Page:
41-50
Research Field:
建筑结构
Publishing date:

Info

Title:
Parameter analysis of seismic behavior and bearing capacity calculation of reinforced concrete columns with stay-in-place UHPC formwork
Author(s):
WANG Peng1; 2;  YOU Xuehui1;  SHI Qingxuan1; 2;  TAO Yi1; 2;  RONG Chong1; 2;  HUANG Jie1
(1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China)
Keywords:
UHPC formwork;  reinforced concrete column;  seismic behavior;  numerical simulation;  bearing capacity calculation
PACS:
TU375
DOI:
10.19815/j.jace.2023.04075
Abstract:
To investigate the seismic behavior of reinforced concrete columns with stay-in-place UHPC formwork under the influence of various parameters, based on the concrete damage plastic(CDP)model in ABAQUS software, a numerical analysis model was established considering the bonding interface slip between formwork and concrete. The effect of axial compression ratio, ordinary concrete strength, reinforcement ratio and formwork thickness on the bearing capacity and ductility of reinforced concrete columns with stay-in-place UHPC formwork were discussed. Based on the plane section assumption, a formula for predicting the bearing capacity of UHPC formwork-RC column was provided. The results show that the established finite element model can well simulate the bearing capacity, skeleton curve and concrete damage of the specimen. With the increase of axial compression ratio, the bearing capacity and ductility of specimen first increase and then decrease, and the bearing capacity and ductility reach the maximum when the axial compression ratio is 0.7. With the increase of concrete strength, the bearing capacity gradually increases, but the growth rate gradually decreases. Increasing the reinforcement ratio can enhance the bearing capacity of specimen, but it has little effect on ductility. The thickness of the formwork has a significant influence on the bearing capacity and ductility. When the formwork thickness is increased from 10 mm to 25 mm, the bearing capacity is increased by 24.1%, but its ductility is decreased by 43.8%. Under the condition that the specimen has sufficient bearing capacity and deformation capacity, it is suggested that the formwork thickness can be 15-20 mm. The bearing capacity calculation method based on the plane section assumption can well predict the bearing capacity of the specimen. The average ratio of the calculated value to the simulated value(test value)is 0.97, and the standard deviation is 0.04.

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Last Update: 2025-01-20