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头部截面损伤的带头螺柱抗剪连接件拉伸性能的数值研究

Numerical Study on the Tensile Performance of Headed Stud Shear Connectors with Head-Sectional Damage.

作者信息

Xu Xiaoqing, Zeng Shanwen, He Wei, Hou Zhujian, He Dongyang, Yang Tao

机构信息

College of Civil Engineering, Tongji University, Shanghai 200092, China.

Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Nanning 530004, China.

出版信息

Materials (Basel). 2022 Apr 11;15(8):2802. doi: 10.3390/ma15082802.

DOI:10.3390/ma15082802
PMID:35454499
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9024709/
Abstract

An extensive numerical study was carried out due to the concern that head-sectional damage caused by corrosion poses a threat to the tensile performance of headed stud connectors. Three-dimensional finite element models of pull-out tests were established, with both material and geometric nonlinearities being considered. In particular, the concrete weak region due to bleeding was simulated. The simulation method was verified by the results of pull-out tests on two connectors with different damage degrees. Tensile performance of headed stud shear connectors of various shaft diameters ( = 10 to 25 mm) with various damage degrees (up to 50%) was simulated. It was observed that the connector with a high damage degree exhibited low capacity and a failure closer to pull-out failure than concrete cone breakout failure. Based on the numerical results, reduction factors for quantitatively assessing the influence of head-sectional damage degree on the loading capacity and stiffness of connectors were proposed. With reference to the Concrete Capacity method, the reduction in tensile capacity of connectors with head-sectional damage was found to be caused by the decrease in the projected area of the concrete cone due to the reduction in head diameter, concrete cone angle, and embedment depth. Meanwhile, numerical results showed that the stiffness of a connector at a high embedment depth or in high strength concrete was more sensitive to head-sectional damage. It was also found that the elastic modulus of the weak region significantly affected the stiffness of connectors, while the influence of its thickness on the capacity and stiffness was insignificant.

摘要

由于担心腐蚀造成的头部截面损伤会对带头螺栓连接件的拉伸性能构成威胁，开展了广泛的数值研究。建立了拉拔试验的三维有限元模型，同时考虑了材料和几何非线性。特别地，模拟了因泌水导致的混凝土薄弱区域。通过对两个不同损伤程度连接件的拉拔试验结果验证了模拟方法。模拟了不同轴径（ = 10至25毫米）、不同损伤程度（高达50%）的带头螺栓抗剪连接件的拉伸性能。观察到损伤程度高的连接件承载力低，且其破坏比混凝土锥体破坏更接近拉拔破坏。基于数值结果，提出了定量评估头部截面损伤程度对连接件承载能力和刚度影响的折减系数。参照混凝土承载力方法，发现头部截面有损伤的连接件拉伸承载力降低是由于头部直径、混凝土锥体角度和埋深减小导致混凝土锥体投影面积减小所致。同时，数值结果表明，埋深较大或在高强度混凝土中的连接件刚度对头部截面损伤更敏感。还发现薄弱区域的弹性模量对连接件刚度有显著影响，而其厚度对承载力和刚度的影响不显著。

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