Multi-level reliability-based load-carrying capacity evaluation method of bridges

被引：1
|
作者：
Zheng X. [1 ]
Yi T. [1 ]
Yang D. [1 ]
Li H. [1 ]
Zhou H. [2 ]
机构：
[1] School of Civil Engineering, Dalian University of Technology, Dalian
[2] College of Civil and Transportation Engineering, Shenzhen University, Shenzhen
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2024年 / 54卷 / 01期
关键词：
highway bridges; limit state; load factor; load-carrying capacity evaluation; reliability index;
D O I：
10.3969/j.issn.1001-0505.2024.01.005
中图分类号：
学科分类号：
摘要：
To introduce the philosophy of “conservative design,non-conservative evaluation”into Chinese bridge evaluation code,an “inventory and operation”two target-reliability level bridge evaluation method is proposed. The similarities and differences between Chinese and American bridge evaluation codes are summarized,which include the unity check formulas,target reliability indexes and load factors. Based on the comparison results,the method of adjusting the target reliability indexes by reducing the live load factor is introduced into Chinese code. First,the evaluation reliability index of operational bridges is obtained through reducing the design reliability of inventory bridges by 0. 5. Then,the evaluation live load factors of operational bridges with different load types and live load conditions are calibrated through first order second moment (FOSM)method,and an “inventory bridges 1. 4,operational bridges 1. 2”live load factors selection suggestion is given. Finally,the feasibility of the proposed method is verified through a simply supported RC T-beam bridge evaluation example. The results show that the most unfavorable demand-capacity ratio is reduced by 0. 07 compared with the specification method,which realizes the non-conservative evaluation philosophy of the operational bridge. © 2024 Southeast University. All rights reserved.
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页码：36 / 43
页数：7
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