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斜拉桥 9

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CFRP索斜拉桥动态特性的有限元分析及动态试验

蔡东升,刘荣桂,许飞,周士金

《中国工程科学》 2010年第12卷第2期页码 16-21

摘要：

介绍了国内首座CFRP索斜拉桥的工程概况；建立了该桥的三维空间梁壳杆系有限元动态分析模型，进行了结构动态特性有限元分析；进行了环境激励下国内首座CFRP索斜拉桥结构动态特性的测试，结合试验结果对国内首座CFRP索斜拉桥的动态特性进行了分析。笔者等试验及相关研究分析结论可为CFRP索桥梁的动态建模、动态特性分析、抗震抗风设计及CFRP新型缆索材料在桥梁工程中的进一步推广应用提供一定的参考依据。

关键词： CFRP索斜拉桥动态特性有限元分析环境激励动态试验

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CFRP拉索预应力超高性能混凝土斜拉桥力学性能分析

方志,任亮,凡凤红

《中国工程科学》 2012年第14卷第7期页码 53-59

摘要：

为了探讨碳纤维复合材料 (carbon fiber reinforced polymer, CFRP) 和超高性能活性粉末混凝土(reactivepowder concrete, RPC)在超大跨度斜拉桥中应用的可行性，以主跨1 008 m的大跨度钢主梁斜拉桥设计方案为例，采用拉索的等强度原则将原桥钢索替换成CFRP索，考虑截面刚度、截面应力和局部稳定等要求，将原桥钢主梁替换成RPC主梁，拟订了一座等跨度的CFRP拉索、RPC主梁斜拉桥方案。结果表明：从结构受力性能角度而言，采用超高性能混凝土主梁和CFRP拉索构成千米级跨度混凝土斜拉桥的结构体系是可行的。

关键词：斜拉桥碳纤维(CFRP) 活性粉末混凝土力学性能

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千米级斜拉桥长索架设技术

饶华容,邓惠斌

《中国工程科学》 2009年第11卷第3期页码 71-74

摘要：

以苏通长江公路大桥为例介绍了千米级斜拉桥斜拉索安装方法及其施工要点。论述了斜拉索的桥面展开、塔端挂设、梁端牵引锚固以及PE保护等长索安装施工的关键技术问题。长索桥面的展开采用立式放索，梁端牵引锚固采用卷扬机、钢绞线以及张拉杆共同组成的三级组合牵引方式，长索张拉在梁端进行。

关键词：千米级斜拉桥斜拉索长索张挂工艺长索安装

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基于拉索安全评估的普通斜拉桥和矮塔斜拉桥结构冗余度对比研究 Article

Khawaja Ali, Hiroshi Katsuchi, Hitoshi Yamada

《工程（英文）》 2021年第7卷第1期页码 111-123 doi: 10.1016/j.eng.2020.07.021

摘要：

本研究基于斜拉桥和矮塔斜拉桥的拉索安全性评估，为比较斜拉桥和矮塔斜拉桥提供了新的观点。由于二者都使用拉索，人们通常认为这两种类型的桥梁具有相同的结构。但是，国际桥梁设计标准规定了二者各自的拉索安全系数。为了实现这一目标，根据日本现行的拉索设计指南，本文建立了两座桥的三维模型。在达到桥梁模型的平衡状态之后，以参数化方式对拉索的不同安全系数进行了静态分析。最后，采用一阶可靠性方法和蒙特卡洛方法确定了拉索的可靠性指标。分析结果表明，在相同的荷载条件下，斜拉桥和矮塔斜拉桥在不同安全系数下具有不同的结构冗余度。此外，随着拉索的安全系数的增加，其结构上的冗余大大增加。

关键词：斜拉桥矮塔斜拉桥冗余拉索安全系数可靠性分析

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两座大型斜拉桥索塔锚固区模型试验及对比研究

刘钊,孟少平,吕志涛

《中国工程科学》 2003年第5卷第12期页码 48-54

摘要：

简要介绍了两座大型斜拉桥（南京长江第二大桥南汊桥和润扬长江公路大桥北汊桥）索塔锚固区的节段足尺模型试验，研究了索塔锚固区的抗裂安全系数和极限承载力；同时，还对索塔锚固区预应力索的合理布置形式、索塔节段模型对索塔整体的仿真效果等进行了研究，对于斜拉桥索塔设计具有理论指导意义和实用价值。

关键词：斜拉桥索塔模型试验设计研究

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苏通大桥——主跨1 088米的斜拉桥

游庆仲,何平,董学武,张喜刚,吴寿昌

《中国工程科学》 2009年第11卷第3期页码 14-19

摘要：

介绍了苏通大桥设计和施工的工程构思，着重对群桩基础承载性能、河床冲刷防护及监测、上部结构施工抗风研究、中跨合龙方案及长悬臂结构施工控制方法等的关键技术和创新成果进行了总结和系统阐述。

关键词：苏通大桥斜拉桥基础索塔钢箱梁斜拉索施工控制

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斜拉桥的拉索纵桥向风荷载计算方法研究

裴岷山,张喜刚,朱斌,侯斌,刘昌鹏

《中国工程科学》 2009年第11卷第3期页码 26-30

摘要：

介绍了苏通大桥在设计过程中专门对斜拉索进行的测力试验情况，并与国外相关研究成果进行了对比，提出了斜拉索纵桥向风荷载阻力系数计算公式。

关键词：苏通大桥斜拉桥；斜拉索；纵桥向；风荷载试验

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千米级斜拉桥空间非线性合理恒载索力分析

张建民,肖汝诚

《中国工程科学》 2004年第6卷第12期页码 37-42

摘要：

建立了斜拉桥索力调整的空间非线性有限元分析模型，以斜拉桥主梁和索塔的弯曲应变能为目标函数、结构应力及索力为约束条件，采用一阶最优化计算方法进行求解，用以确定成桥合理状态的索力。应用该法分析了某千米级斜拉桥的合理成桥状态，计算结果表明，该方法简单、有效。

关键词：斜拉桥一阶分析法合理成桥状态

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enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP

《结构与土木工程前沿（英文）》 2022年第16卷第1期页码 131-143 doi: 10.1007/s11709-021-0787-8

摘要： This paper studied the effect of incorporation of carbon nanotubes (CNTs) in carbon fiber reinforced polymer (CFRP) on strengthening of reinforced concrete (RC) beams. The RC beams were prepared, strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets, and tested under four-point loading. The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP. A nonlinear finite element (FE) model was built, validated, and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP. The studied parameters included concrete strength, flexural reinforcement ratio, and CFRP sheet configuration. The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations. The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam. In case of using underside-strip, the longer or the wider the sheet, the higher was the flexural capacity of the beams. The flexural enhancement of RC beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

关键词： RC beams flexural strengthening CFRP CNTs finite element

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Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

《结构与土木工程前沿（英文）》 2021年第15卷第5期页码 1144-1159 doi: 10.1007/s11709-021-0762-4

摘要： The mechanical properties of CFRP-confined rectangular concrete-filled stainless steel tube (CFSST) stub columns under axial compression were experimentally studied. A total of 28 specimens (7 groups) were fabricated for the axial compression test to study the influences of length-to-width ratio, CFRP constraint coefficient, and the thickness of stainless steel tube on the axial compression behavior. The specimen failure modes, the stress development of stainless steel tube and CFRP wrap, and the load–strain ratio curves in the loading process were obtained. Meanwhile, the relationship between axial and transverse deformations of each specimen was analyzed through the typical relative load−strain ratio curves. A bearing capacity prediction method was proposed based on the twin-shear strength theory, combining the limit equilibrium state of the CFRP-confined CFSST stub column under axial compression. The prediction method was calibrated by the test data in this study and other literature. The results show that the prediction method is of high accuracy.

关键词： CFRP rectangular CFSST stub column bearing capacity limit equilibrium state twin-shear strength theory

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Seismic retrofitting of severely damaged RC connections made with recycled concrete using CFRP sheets

Yasmin MURAD, Wassel AL BODOUR, Ahmed ASHTEYAT

《结构与土木工程前沿（英文）》 2020年第14卷第2期页码 554-568 doi: 10.1007/s11709-020-0613-8

摘要： An experimental and numerical program is carried out in this research to investigate the influence of CFRP sheets on the cyclic behavior of unconfined connections made with recycled concrete. Cement is partially replaced by silica fume, iron filling and pulverised fuel ash using two different percentages: 15% and 20%. Each specimen is partially loaded at the first stage and then specimens are repaired using CFRP sheets. The repaired specimens are then laterally loaded until failure. In addition, a finite element model is built in ABAQUS and verified using the experimental results. The experimental results have shown that the repaired specimens have regained almost double the capacity of the un-repaired specimens and hence the adopted repair configuration is recommended for retrofitting seismically vulnerable RC connections. Increasing cement replacement percentage by silica fume, fuel ash or iron filling from 15% to 20% has reduced joint carrying capacity and weakened the joint. It is recommended using 15% pulverised fuel ash or silica fume as cement partial replacement to enhance the strength and ultimate drift of beam-column joints under cyclic loading. Iron filling concrete is also recommended but the enhancement is relatively less than that found with pulverised fuel ash concrete and silica fume concrete.

关键词： retrofitting CFRP sheets recycled concrete pulverised fuel ash silica fume cyclic beam-column connections

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悬索桥主缆单元索股水平收放索技术应用智能放索装置研制

沈旺,俞建群,顾庆华,毛优达

《中国工程科学》 2010年第12卷第7期页码 4-7

摘要：

介绍了悬索桥主缆单元索股放索时，针对水平收放索技术的一种被动式智能放索装置的设计原理、组装和试验，以及在使用此智能放索装置后，主缆单元索股放索质量的提高

关键词：悬索桥主缆单元索股智能放索装置

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Study of high-strength CFRP bolted joints with failure- monitoring cone washers

Tsukasa KATSUMATA, Yoshihiro MIZUTANI, Akira TODOROKI, Ryosuke MATSUZAKI

《机械工程前沿（英文）》 2011年第6卷第3期页码 272-276 doi: 10.1007/s11465-011-0231-1

摘要：

To increase the strength of carbon-fiber-reinforced plastic (CFRP) bolted joints, a method to increase the friction force between carbon-fiber-reinforced plastic members was proposed. The increase in failure load for the proposed joint was confirmed in finite-element method analyses and joint tests. Additionally, the feasibility of damage monitoring using surface strains of the cone washer was demonstrated.

关键词： composite bolted joint failure monitoring finite-element method

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Truss-arch model for shear strength of seismic-damaged SRC frame columns strengthened with CFRP sheets

Sheng PENG, Chengxiang XU, Xiaoqiang LIU

《结构与土木工程前沿（英文）》 2019年第13卷第6期页码 1324-1337 doi: 10.1007/s11709-019-0557-z

摘要： Carbon fiber reinforced polymer (CFRP) materials are important reinforcing substances which are widely used in the shear strengthening of seismic-damage steel reinforced concrete (SRC) frame structures. To investigate the shear strength of SRC frame columns strengthened with CFRP sheets, experimental observations on eight seismic-damaged SRC frame columns strengthened with CFRP sheets were conducted at Yangtze University and existing experimental data of 49 SRC columns are presented. Based on the existing experiments, the theories of damage degree, zoning analysis of concrete, and strengthening material of the column are adopted. To present the expression formula of the shear strength of SRC frame columns strengthened with CFRP sheets, the contributions of strengthening material and transverse reinforcement to shear strength in the truss model are considered, based on the truss-arch model. The contribution of arch action is also considered through the analysis of the whole concrete and that of the three zones of the concrete are also considered. The formula is verified, and the calculated results are found to match well with the experimental results. Results indicate that the proposed whole analysis model can improve the accuracy of shear strength predictions of shear seismic-damaged SRC frame columns reinforced with CFRP sheets.

关键词： carbon fiber reinforced polymer material steel reinforced concrete frame column seismic-damaged trussed-arch model shear strength