Damage evaluation of hinged joints by method of orthotropic plates with hinged joints

doi:10.3785/j.issn.1008-973X.2022.05.009

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (5): 920-929 DOI: 10.3785/j.issn.1008-973X.2022.05.009

Damage evaluation of hinged joints by method of orthotropic plates with hinged joints

Xiao-jing NI1,2(

),Yuan XING2,Rong-qiao XU1,*(

)

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Huahui Engineering Design Group Co. Ltd., Shaoxing 312000, China

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Abstract

A two-dimensional shear force calculation model for hinged joint (HJSFM) taking damage position, cracking length and degree of hinged joints into account was established, in order to quantitatively evaluate the damage degree of hinged joint in the hollow slab girder bridge and provide decision-making basis for subsequent maintenance and reinforcement. In this model, single hollow slab was compared to an orthotropic plate, and the bridge was formed by multiple orthotropic plates laterally connected through hinged joints. The relationship between shear force of the hinged joint and relative displacement occurring across the hinged joint was introduced as the force transfer equation between orthotropic plates. The analytical solution for HJSFM under loads was derived based on Fourier series expansion. Based on the evolution of damage state of hinged joints under design load and overload, a three-level damage rating scheme of light, medium and heavy for hinged joints (HJDRS) was put forward. HJSFM and HJDRS composed the core of damage assessment model for hinged joint (HJDAM). Finally, a finite element model was established to verify accuracy of the shear force calculated by the HJSFM, and the HJDAM was applied to a hollow slab girder bridge with damaged hinged joints. Results show that the accuracy of shear force obtained by the HJSFM can meet the engineering needs and the HJDAM is feasible.

Key words： hollow slab girder bridge method of orthotropic plate with hinged joints hinged joint disease damage assessment maintenance decision

Received: 15 June 2021 Published: 31 May 2022

CLC:

U 446.1

Fund: 浙江省“尖兵”“领雁”研发攻关计划资助项目(2022C01143)；国家自然科学基金资助项目(51478422)

Corresponding Authors: Rong-qiao XU E-mail: nxj54837@126.com;xurongqiao@zju.edu.cn

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Cite this article:

Xiao-jing NI,Yuan XING,Rong-qiao XU. Damage evaluation of hinged joints by method of orthotropic plates with hinged joints. Journal of ZheJiang University (Engineering Science), 2022, 56(5): 920-929.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.05.009 OR https://www.zjujournals.com/eng/Y2022/V56/I5/920

基于铰接正交异性板法的铰缝损伤评估理论

为了定量评估空心板梁桥铰缝损伤程度，为后续维修加固提供决策依据，将单块空心板比拟成正交异性板，视空心板桥上部为铰接正交异性板结构，引入铰缝剪力与铰缝两侧挠度差关系式作为板间传力方程，建立二维可考虑不同位置、不同长度及不同程度铰缝损伤影响的铰缝剪力计算模型(HJSFM)，并导出荷载作用下铰缝处剪力Fourier级数形式的解析解.在此基础上，以设计荷载和加大荷载下铰缝的损伤演化为依据，提出轻、中、重3级铰缝损伤程度评级方案(HJDRS)，形成铰缝损伤评估模型(HJDAM). 以有限元模拟结果对本模型铰缝剪力计算值的正确性进行验证，并将本铰缝损伤评估模型应用于一座铰缝损伤的空心板梁桥. 研究表明，剪力计算模型得到的铰缝剪力的精度满足工程需要，并且该损伤评估模型可行.

关键词： 空心板梁桥, 铰接正交异性板法, 铰缝病害, 损伤评估, 维修决策

Fig.1 Load and boundary conditions for single orthotropic plate

Fig.2 Shear force-relative displacement curves for hinged joint

Fig.3 Flow chart for shear force of hinged joint

Tab.1 Main technical indexes of vehicle load

Fig.4 Illustration of vehicle load

Fig.5 Illustration of vehicle load arrangement on hollow slab girder bridge

Fig.6 Illustration of cross-section of hollow slab and hinged joint

Tab.2 Calculation parameters of hollow slab and hinged joint

Fig.7 Illustration of finite element model for calculating shear force at hinged joints of hollow slab bridge

Fig.8 Variation of shear force with number of Fourier expansion terms at F~J

Fig.9 Comparison of shear force at hinged joint 1 resulted from finite element method and proposed shear calculation model

Tab.3 Shear force at hinged joint 1 resulted from finite element method and proposed shear calculation model

Fig.10 Illustration of cross section of hollow slab girder bridge

Tab.4 Calculation parameters of hinged joint

Fig.11 Evolution of damage area of hinged joints with movement of vehicle queue


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