检索结果-内蒙古大学图书馆

International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Mi Zhou Yongcun Jiang State Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an China

ISBN: (纸本)9781728113678;9781728113661

In order to study the ductility of reinforced concrete columns under the influence of different parameters, six reinforced concrete column models with different design parameters were fabricated based on the pseudo-static test of large-scale reinforced concrete columns. The failure modes of reinforced concrete columns under the influence of different column height, longitudinal reinforcement ratio and chloride ion erosion were studied. The hysteresis curves and skeleton curves obtained from the test were analyzed, and the relationship between the displacement ductility of reinforced concrete columns and three influencing factors was obtained.

关键词： Concrete Hysteresis Skeleton Loading Ions Force Earthquakes

来源：评论

学校读者我要写书评

暂无评论

Summary of Research on Seismic Behavior of Precast Column System With the Same Effect as the Cast-In-Place Column

Summary of Research on Seismic Behavior of Precast Column Sy...

引用

International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Mi Zhou Hang Zeng State Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University Xi'an China

ISBN: (纸本)9781728113678;9781728113661

This paper introduces five splicing methods between the precast columns and the cap beam or footing: Wet Joint connection, socket connection, grouted splice sleeve connection, grouted ducts connection, UHPC connection, and the grouted ducts connection between each section of the column, reviewing various types of connection structure, construction characteristics and seismic performance from two aspects of experimental research and engineering application, in order to provide reference for domestic research peers and promote the application of the precast column system with the same effect as the cast-in-place column (CIP) in China.

关键词： bridges Bars Sockets Plastics Steel Fasteners Ducts

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Influence of Boundary Conditions on the Mechanical Characteristics of Arch bridge with Composite Arch

引用

IOP Conference Series: Earth and Environmental Science 2020年第5期446卷

作者： Changchang Li Ling-Ling Wu Shengbo Chai Yu Zhao Yong-Jun Zhou School of Highway Chang'an University Xi'an 710064 China School of Architecture and Civil Engineering Xi'an University of Science and Technology Xi'an 710054 China Key Laboratory for old Bridge Detection and Reinforcement Technology of Ministry of Transportation Xi'an 710064 China

Mid-through arch bridge with a composite arch rib of the main arch and vice-arch is novel and reliable in rigidity. It belongs to the high-order statically indeterminate structures, and the boundary form has a great influence on the internal force and deflection of the structure. In this paper, in order to study the influence of different boundary conditions on the static and dynamic characteristics of the structure, relying on a practical project, the static and dynamic characteristics of the bridge under different boundary conditions of the main arch foot are analyzed and compared by using finite element method, which provides scientific basis for the design of the arch bridge with composite arch. The results show that the boundary conditions of the main arch foot have obvious effects on the deflection and internal force of the arch under dead and moving loads, but have little effect on the dynamic characteristics and stability of the bridge.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the sensitive parameters of non-destructive test method for the cable based on the leakage magnetic principle

引用

IOP Conference Series: Earth and Environmental Science 2020年第7期474卷

作者： Zhenhua Dong Ping Fan Pengfei Li Yan Mao Bridge and Tunnel Research Center Research Institute of Highway Science of Transport Ministry Beijing 100088 China Key laboratory of old bridge inspection and reinforcement technology industry Beijing 100088 China

The nondestructive testing (NDT) technique of steel rope based on the leakage magnetic principle has been extensively applied to the cable. In view of the difference of geometric characteristics, structures, loading between steel rope and cable, the applicability of the leakage magnetic NDT and the sensitive parameters on detection accuracy should be studied. So a cable specimen with local defects was designed and fabricated, and then the leakage magnetic testing technique was applied. The experimental electrical signal output of the cable were compared and analyzed. The results show that the accuracy of the test results is strictly related to the geometric characteristics of the test instrument, the depth of internal defects, the height of sensor removal, the sensitivity coefficient of the magnetically sensitive element, the defect spacing, etc., and the qualitative evaluation and individual quantitative index of the cable defects are proposed. The above conclusions can provide data support for the test quantitative index and the application of nondestructive testing technique.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Calculation method of creep under decreasing stress considering variation of natural environmental factors

引用

IOP Conference Series. Earth and Environmental Science 2020年第3期446卷

作者： Zhao, Yu Zhou, Yongjun Wang, Yan Chuang, Song School of Highway Chang’an University Xi’an Shaanxi 710064 China Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang’an University Xi’an Shaanxi 710064 China School of Highway Chang’an University Xi’an Shaanxi 710064 China

The actual structure is always in the state of natural changing environment and stress decreasing in the section. At present, there is little method for calculating the creep under decreasing stress which takes environmental variation into account. As excessive deflection becomes a serious problem for long span continuous rigid frame bridges during the operation period, in this paper, a creep calculation method is proposed for the continuous decrease of stress in most girder sections, and considers the environmental factors comprehensively. Firstly, the multifactor (temperature, relative humidity and reinforcement ratio) correction was made to creep model of the current code JTG D62. And five creep recovery models were compared and analyzed simultaneously. Based on the elastic creep theory and the superposition principle, the improved creep calculation method was proposed. Then theoretical calculation was carried out for the assumed structure. The results showed that the calculated value obtained by the proposed method were obviously different from those obtained by the code, and were significantly different from those obtained without considering creep recovery, which proves the superiority of the proposed method under the action of multiple environmental factors and decreasing stress.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on protection monitoring of existing subway tunnel based on high precision automatic monitoring system

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期580卷

作者： Juan Hu Zhifan Wei School of urban construction Zhejiang Shuren University Hangzhou Zhejiang 310015 China Key Laboratory of traffic industry for old bridge detection and reinforcement technology of Chang'an University Xi'an Shaanxi 710064 China Zhejiang Engineering Survey Institute Ningbo Zhejiang 315012 China

In order to ensure the safety of the subway in the process of excavation, combining with the geographical location and geological situation of the project, with the high-precision automatic monitoring system, it sets up the corresponding monitoring points to protect and monitor the subway near the project, so as to ensure the normal construction of the foundation pit Iron impact is minimized. The monitoring results were in line with the requirements of the specification, providing guarantee for the subsequent construction.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Simplification of Vertical Live Loading for In-Service bridge Pile Foundation

Simplification of Vertical Live Loading for In-Service Bridg...

引用

2018 International Conference on Manufacturing technology, Materials and Chemical Engineering, MTMCE 2018

作者： Hu, Juan Gao, Jingjing College of Urban Construction Zhejiang Shuren University Hangzhou310015 China Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Chang'An University College of Highway Xi'an710064 China Shaanxi Railway Institute Weinan714000 China

In order to determine the distribution of live load on the in-service bridge pile, the live load were statistically analyzed that the distribution at the end of the beam at the fulcrum of the beam and the T beam in the middle and small span of the highway bridge, the proportion of live load is obtained in the counter force at the end of the beam. According to the statistical results, the corresponding relationship between the ratio of cyclic loading and the span of highway bridge is established, and according to the traffic volume and the effective number of trips calculated by different types of vehicles, the relation between the number of cyclic loads and the operation time of the bridge pile foundation is analyzed. The above results were combined with the time cycle of the vehicle on the bridge, a simplified calculation model of static load and live load on bridge pile foundation is established, which the obtained results can be directly applied to the test and loading of in-service bridge pile foundation and to guide the single pile model test in the laboratory, and has a strong application value. © Published under licence by IOP Publishing Ltd.

关键词： Highway bridges

来源：评论

学校读者我要写书评

暂无评论

External parameters analysis of the shrinkage and creep on wide deck and curved extradosed cable-stayed bridge

引用

Revista de la Facultad de Ingenieria 2017年第1期32卷 316-323页

作者： Feng, Yang Song, Yifan Feng, Mingshuo School of Highway Chang'an University Xi'an710064 China Key Laboratory of Old Bridge Detection and Reinforcement Technique Ministry of Transport Xi'an710064 China Kaifeng Tongda Highway Investigation and Design Co. Ltd Kaifeng475003 China

In order to analyze the influence of the shrinkage and creep on structure performance of wide deck and curved extra-dosed cable-stayed bridge. Based on the Huanglong bridge and the finite element theory, considering the influence of relative humidity, loading age, pre-stressing force, the parameters of relative humidity selected 45%-95%, the parameters of loading age selected 3 days -14 days, the parameters of pre-stressing force selected 65%-85%, analyzes the change trend of mid-span deflection, mid-span bending moment, pounding bottom bending moment in finished bridge state, three years after the state, ten years after the state. The research results show that: in the low range of parameters,the influence of pre-stressing force on the structure is remarkable, and the linear effect is outstanding; in the higher range of parameters, the influence of relative humidity parameters on the structure is remarkable, and the nonlinear effect is outstanding; the influence of loading age on the structure has certain nonlinear effect.

关键词： Loading

来源：评论

学校读者我要写书评

暂无评论

The improvement of gray system theory based on Kalman's filtering method and its application in extradosed cable-stayed bridge construction control

引用

C e Ca 2017年第1期42卷 82-85页

作者： Feng, Yang Feng, Mingshuo Song, Yifan School of Highway Chang'an University Xi'an710064 China Kaifeng Tongda Highway Investigation and Design Co. Ltd Kaifeng475003 China Key Laboratory of Old Bridge Detection and Reinforcement Technique Ministry of Transport Chang'an University Xi'an710064 China

In the construction of extradosed cable-stayed bridge, the measured deflection values are often different from design value. As a solution, the grey system theory was modified by Kalman's filtering method and was applied in the field deflection prediction. We analyzed the actual measurement data set and predicted the adjustment values of deflection gradually in the construction process, so as to meet the design requirements of extradosed cable-stayed bridge structure and to achieve the design requirements of flexure and internal force state. In order to verify the accuracy of the improved calculation model, the original grey system theory and the modified one using Kalman's filtering method are adopted in the deflection prediction based on the actual extra dosed cable-stayed bridge. Experimental results show that the revised grey system theory based on Kalman's filtering method can effectively reduce the deviation between predicted values and measured ones, reducing the deviation of bridge linear from the design one as well.

关键词： Cable stayed bridges

来源：评论

学校读者我要写书评

暂无评论

The Analysis of Interface Normal Stress of Short Column of Square Concrete-Filled Steel Tube with Axial Compression

引用

IOP Conference Series. Earth and Environmental Science 2019年第1期283卷 012043-012043页

作者： Zhang, Zhengqi Zhang, Zhiheng Liu, Yongjian Gao, Cheng School of Highway Chang’an University Xi’an Shaanxi Province China School of Highway Chang’an University Xi’an Shaanxi Province China Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel Xi’an Shaanxi Province China Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications Xi’an Shaanxi Province China

The interface normal stress reflects the interaction between the steel tube and the concrete in the tube, which is helpful to distinguish the time and size that begin to appear confinement effect of the concrete filled steel tube. The typical CFST members in engineering applications may be loaded such as loading through the whole cross section, loading through steel alone and loading through concrete alone, etc. Establishing nonlinear finite element model to analyse the interface normal stress between steel and concrete along the section width, short column height and with the change of axial compressive load, the results show that the different loading mode of CFST column interface normal stress along the width of the cross section showed a “trough” distribution, but the value is different, sorted by size in descending order is loading through concrete alone, loading through the whole cross section, loading through concrete alone. When steel tube and concrete are subjected to loads, the effective length of steel tube confined concrete is about 0.55 times the width of the section, and the normal stress of the interface is almost 0 in the unconstrained area after 0.5 times of the ultimate load.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：