球扁钢肋钢纤维混凝土组合桥面板正弯矩受力性能试验

doi:10.13229/j.cnki.jdxbgxb.20220904

摘要/Abstract

摘要：

针对一种采用80 mm厚钢纤维混凝土（SFRC）和球扁钢纵肋的新型组合桥面板，设计制作了两个组合桥面板足尺模型，进行了正弯矩加载试验，测试得到加载全过程结构变形和应变变化情况。采用截面弹塑性截面分析方法、线弹性分析方法和刚塑性分析方法计算了正弯矩承载力，并与试验结果进行对比。研究结果表明：组合桥面板在承受正弯矩荷载时位移延性系数为4.90~5.77，具有较好的延性；在承载能力极限状态下，组合桥面板正弯矩承载力由球扁钢受力控制，SFRC具有充足的抗压强度，提高混凝土强度对正弯矩承载力影响很小；截面弹塑性分析能较为准确地计算正弯矩承载力，适合用于组合桥面板设计计算。

关键词: 桥梁工程, 组合桥面板, 正交异性钢桥面板, 钢纤维混凝土, 球扁钢加劲肋, 弯矩承载力

Abstract:

A composite bridge deck composed of 80 mm steel-fiber-reinforced concrete （SFRC） and longitudinal bulb-flat ribs was investigated by model tests. Two full-scale specimens were designed and fabricated. Positive bending tests were carried out and the variations of stiffness and structural strain during the loading process were obtained. The elastoplastic cross-sectional analysis method， linear elastic analysis method and rigid-plastic analysis method were used to calculate the positive bending resistance and the results were compared with the experimental results. It was found that the composite bridge deck has good ductility when it was subjected to positive bending. At the ultimate limit state， the positive bending resistance is governed by the stress bearing of the bulb-flat ribs and the SFRC has sufficient compressive strength. Increasing the compressive strength of SFRC has little influence on the positive bending resistance. The elastoplastic cross-sectional analysis is more accurate and applicable for the calculation of the positive bending resistance of the composite bridge deck.

Key words: bridge engineering, composite bridge deck, orthotropic steel deck, steel-fiber-reinforced concrete （SFRC）, bulb-flat ribs, bending resistance

中图分类号:

TU398

张春雷,邵长宇,苏庆田,戴昌源. 球扁钢肋钢纤维混凝土组合桥面板正弯矩受力性能试验[J]. 吉林大学学报(工学版), 2024, 54(6): 1634-1642.

Chun-lei ZHANG,Chang-yu SHAO,Qing-tian SU,Chang-yuan DAI. Experimental on positive bending behaviour of composite bridge decks with steel-fiber-reinforced concrete and longitudinal bulb-flat ribs[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(6): 1634-1642.

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试件	S-PA	S-PB
抗压强度/MPa	114.6	104.6
抗折强度/MPa	13.2	10.7
弹性模量/MPa	49 600	58 600
极限压应变/με	2 310	1 785

参数	S-PA	S-PB
f_c/MPa	100	90
ε₀/με	2 310	1 785
k	1.59	2.06