Open Access

ARTICLE

Calibration and Reliability Analysis of Eccentric Compressive Concrete Column with High Strength Rebars

Baojun Qin^1,2, Hong Jiang^1,2,3, Wei Zhang⁴, Xiang Liu^4,*

1 China Communications Construction Co., Ltd., Beijing, 100088, China
2 China Communications Construction Corporation Rail Transit Branch, Beijing, 102200, China
3 China Communications (Tianjin) Rail Transit Investment and Construction Co., Ltd., Tianjin, 300222, China
4 School of Civil Engineering, Fujian University of Technology, Fuzhou, 350118, China

* Corresponding Author: Xiang Liu. Email:

(This article belongs to the Special Issue: Sustainable and Durable Construction Materials)

Structural Durability & Health Monitoring 2025, 19(5), 1203-1220. https://doi.org/10.32604/sdhm.2025.063813

Received 24 January 2025; Accepted 23 April 2025; Issue published 05 September 2025

Abstract

The utilization of high-strength steel bars (HSSB) within concrete structures demonstrates significant advantages in material conservation and mechanical performance enhancement. Nevertheless, existing design codes exhibit limitations in addressing the distinct statistical characteristics of HSSB, particularly regarding strength design parameters. For instance, GB50010-2010 fails to specify design strength values for reinforcement exceeding 600 MPa, creating technical barriers for advancing HSSB implementation. This study systematically investigates the reliability of eccentric compression concrete columns reinforced with 600 MPa-grade HSSB through high-order moment method analysis. Material partial factors were calibrated against target reliability indices prescribed by GB50068-2018, incorporating critical variables including live-to-dead load ratios, design methodologies, and service conditions. The findings show that the value of k significantly affects the calibration of material partial factors, impacting the reliability of bearing capacity. Considering various k values and target reliability indices, it is recommended that the material partial factor be set at 1.15, implying that the design strength for 600 MPa high-strength steel bars should be considered as 522 MPa. For safety levels I and II, load adjustment factors of 1.1 and 0.9, respectively, may be applied.

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Keywords

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