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International Journal of Structural Integrity最新文献

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Study on the design and laboratory investigation of permeable semi-rigid base material with large air voids 大空隙透水半刚性基层材料的设计和实验室调查研究
Pub Date : 2024-01-02 DOI: 10.1108/ijsi-07-2023-0057
Xu Li, Zeyu Xiao, Zhenguo Zhao, Junfeng Sun, Shiyuan Liu
PurposeTo explore the economical and reasonable semi-rigid permeable base layer ratio, solve the problems caused by rainwater washing over the pavement base layer on the slope, improve its drainage function, improve the water stability and service life of the roadbed pavement and promote the application of semi-rigid permeable base layer materials in the construction of asphalt pavement in cold regions.Design/methodology/approachIn this study, three semi-rigid base course materials were designed, the mechanical strength and drainage properties were tested and the effect and correlation of air voids on their performance indexes were analyzed.FindingsIt was found that increasing the cement content increased the strength but reduced the air voids and water permeability coefficient. The permeability performance of the sandless material was superior to the dense; the performance of the two sandless materials was basically the same when the cement content was 7%. Overall, the skeleton void (sand-containing) type gradation between the sandless and dense types is more suitable as permeable semi-rigid base material; its gradation is relatively continuous, with cement content? 4.5%, strength? 1.5 MPa, water permeability coefficient? 0.8 cm/s and voids of 18–20%.Originality/valueThe study of permeable semi-rigid base material with large air voids could help to solve the problems of water damage and freeze-thaw damage of the base layer of asphalt pavements in cold regions and ensure the comfort and durability of asphalt pavements while having good economic and social benefits.
目的探索经济合理的半刚性透水基层配合比,解决坡面雨水冲刷路面基层造成的问题,改善其排水功能,提高路基路面的水稳定性和使用寿命,促进半刚性透水基层材料在寒冷地区沥青路面施工中的应用。设计/方法/途径本研究设计了三种半刚性基层材料,对其力学强度和排水性能进行了测试,并分析了空隙率对其性能指标的影响及相关性。研究结果发现,增加水泥含量可提高强度,但降低了空隙率和透水系数。无砂材料的透水性能优于致密材料;当水泥含量为 7% 时,两种无砂材料的性能基本相同。总的来说,介于无砂型和致密型之间的骨架空隙(含砂)型级配更适合作为透水半刚性基层材料,其级配相对连续,水泥含量?4.5%,强度?1.5 MPa,透水系数?原创性/价值研究大空隙透水半刚性基层材料,有助于解决寒冷地区沥青路面基层的水破坏和冻融破坏问题,保证沥青路面的舒适性和耐久性,同时具有良好的经济效益和社会效益。
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引用次数: 0
Flexural properties of low-height prestressed T-beams: tests and numerical simulations 低高度预应力 T 型梁的挠曲特性:试验和数值模拟
Pub Date : 2023-12-20 DOI: 10.1108/ijsi-07-2023-0058
Lifeng Wang, Jiwei Bi, Long Liu, Ziwang Xiao
PurposeThis paper presents the experimental and numerical results of the bending properties of low-height prestressed T-beams. The purpose is to study the bearing capacity, failure state and strain distribution of low-height prestressed T-beams.Design/methodology/approachFirst, two 13 m-long full-size test beams were fabricated with different positions of prestressed steel bundles in the span. The load–deflection curves and failure patterns of each test beam were obtained through static load tests. Secondly, the test data were used to validate the finite element model developed to simulate the flexural behavior of low-height prestressed T-beams. Finally, the influence of different parameters (the number of prestressed steel bundles, initial prestress and concrete strength grade) on the flexural performance of the test beams is studied by using a finite element model.FindingsThe test results show that when the distance of the prestressed steel beam from the bottom height of the test beam increases from 40 to 120 mm, the cracking load of the test beam decreases from 550.00 to 450.00 kN, reducing by 18.18%, and the ultimate load decreases from 1338.15 to 1227.66 kN, reducing by 8.26%, therefore, the increase of the height of the prestressed steel beam reduces the bearing capacity of the test beam. The numerical simulation results show that when the number of steel bundles increases from 2 to 9, the cracking load increases by 183.60%, the yield load increases by 117.71% and the ultimate load increases by 132.95%. Therefore, the increase in the number of prestressed steel bundles can increase the cracking load, yield load and ultimate load of the test beam. When the initial prestress is from 695 to 1,395 MPa, the cracking load increases by 69.20%, the yield load of the bottom reinforcement increases by 31.61% and the ultimate load increases by 3.97%. Therefore, increasing the initial prestress can increase the cracking load and yield load of the test beam, but it has little effect on the ultimate load. The strength grade of concrete increases from C30 to C80, the cracking load is about 455.00 kN, the yield load is about 850.00 kN and the ultimate load is increased by 4.90%. Therefore, the improvement in concrete strength grade has little influence on the bearing capacity of the test beam.Originality/valueBased on the experimental study, the bearing capacity of low-height prestressed T-beams with different prestressed steel beam heights is calculated by finite element simulation, and the influence of different parameters on the bearing capacity is discussed. This method not only ensures the accuracy of bearing capacity assessment, but also does not require a large number of samples and has a certain economy. The study of prestressed low-height T-beams is of great significance for understanding the principle and application of prestressed technology. Research on the mechanical behavior and performance of low-height prestressed T beams can provide a scie
目的 本文介绍了低高度预应力 T 形梁弯曲性能的实验和数值结果。首先,制作了两根 13 米长的全尺寸试验梁,并在跨中设置了不同位置的预应力钢束。通过静载试验获得了每根试验梁的荷载-挠度曲线和破坏模式。其次,试验数据被用于验证为模拟低高度预应力 T 型梁弯曲行为而开发的有限元模型。最后,利用有限元模型研究了不同参数(预应力钢束数量、初始预应力和混凝土强度等级)对试验梁抗弯性能的影响。试验结果表明,当预应力钢束与试验梁底部高度的距离从 40 毫米增加到 120 毫米时,试验梁的开裂荷载从 550.00 千牛减少到 450.00 千牛,而当预应力钢束与试验梁底部高度的距离从 40 毫米增加到 120 毫米时,试验梁的开裂荷载从 550.00 千牛减少到 450.00 千牛。00 kN 降低到 450.00 kN,降低了 18.18%,极限荷载从 1338.15 kN 降低到 1227.66 kN,降低了 8.26%,因此,预应力钢梁高度的增加降低了试验梁的承载能力。数值模拟结果表明,当钢束数量从 2 个增加到 9 个时,开裂荷载增加了 183.60%,屈服荷载增加了 117.71%,极限荷载增加了 132.95%。因此,增加预应力钢束的数量可以提高试验梁的开裂荷载、屈服荷载和极限荷载。当初始预应力从 695 兆帕增加到 1,395 兆帕时,开裂荷载增加了 69.20%,底部钢筋的屈服荷载增加了 31.61%,极限荷载增加了 3.97%。因此,增加初始预应力可提高试验梁的开裂荷载和屈服荷载,但对极限荷载影响不大。混凝土强度等级从 C30 提高到 C80,开裂荷载约为 455.00 kN,屈服荷载约为 850.00 kN,极限荷载增加了 4.90%。原创性/价值在试验研究的基础上,通过有限元模拟计算了不同预应力钢梁高度的低高度预应力 T 梁的承载力,并讨论了不同参数对承载力的影响。该方法不仅保证了承载力评估的准确性,而且不需要大量样本,具有一定的经济性。预应力低高度 T 梁的研究对于理解预应力技术的原理和应用具有重要意义。研究低高度预应力 T 梁的力学行为和性能,可以为预应力混凝土结构的设计和施工提供科学依据和技术支持。此外,对预应力低高度 T 梁的研究还可以为其他结构类型的优化设计和施工提供参考。
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引用次数: 0
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International Journal of Structural Integrity
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