A modified cohesion-friction model for simulating the contact behaviours of hinge joints in hollow-slab bridges

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-11-04 DOI:10.1617/s11527-024-02498-5

Haiqing Zhu, Yeheng Liu, Aiping Guo

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Abstract

Hollow slabs have been widely used for medium- and small-span bridges, but hollow slab bridges occasionally encounter connecting problems. The key to solve the problems is to ascertain the contact mechanism and subsequently find an approach to simulate them. This paper focuses on developing a cohesion–friction model for concrete interfaces and implementing nonlinear analysis of hollow-slab bridges through a general finite element software. First, the positions and moving tendencies of interfaces in hinge joints are investigated; the stress states on these interfaces can be divided into compression‒shear, tension–shear and pure shear states. Second, a simplified cohesion–friction model for concrete interfaces is proposed in which the shear resistance under different stress states is deduced based on Mohr’s strength theory. Third, the accuracy of the proposed model is verified by a conventional cohesion–friction model. Finally, the proposed model is applied to predict the behaviours of hollow-slab bridges in finite element analysis. Research results indicate that the shear resistance of a concrete interface can be predicted by the proposed model and the behaviours of hollow-slab bridges can be represented by the finite element model. The slab deflection is seriously affected by the friction coefficient and shear strength of the interfaces; hence, it is necessary to calibrate these indexes in advance of numerical simulation analysis.

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用于模拟空心板桥铰接接头接触行为的修正内聚力-摩擦模型

空心板已被广泛用于中小跨度桥梁，但空心板桥偶尔也会遇到连接问题。解决这些问题的关键在于确定接触机制，然后找到模拟方法。本文的重点是建立混凝土界面的内聚摩擦模型，并通过通用有限元软件对空心板桥进行非线性分析。首先，研究了铰缝中界面的位置和移动趋势；这些界面上的应力状态可分为压缩-剪切、拉伸-剪切和纯剪切状态。其次，提出了一种简化的混凝土界面内聚-摩擦模型，根据莫尔强度理论推导出不同应力状态下的抗剪性能。第三，通过传统的内聚-摩擦模型验证了所提模型的准确性。最后，在有限元分析中应用所提出的模型预测空心板桥的行为。研究结果表明，所提出的模型可以预测混凝土界面的抗剪性能，有限元模型可以表示空心板桥的行为。板挠度受到界面摩擦系数和抗剪强度的严重影响，因此有必要在数值模拟分析之前对这些指标进行校准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.