检索结果-南通市图书馆

Over-height truck collisions with railway bridges:attenuation of damage using crash beams

Earthquake Engineering and Engineering Vibration 2022年第1期21卷 237-252页

作者： Dan Xu Xinxing Yuan Ali Irmak Ozdagli Marlon Agüero Roya Nasimi Tao Wang Fernando Moreu Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina EarthquakeAdministrationSanhe 065201China Department of Civil Construction and Environmental EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA Courtesy Appointment Department of Electrical and Computer EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA Courtesy Appointment Department of Mechanical EngineeringUniversity of New MexicoAlbuquerqueNM 87131USA

railway bridges are susceptible to over-height truck collisions and to address this issue,it is necessary to attenuate the effect of these impacts to ensure the safety of transportation *** study experimentally investigates the effectiveness of crash beams as a cushioning mechanism for railway bridges against ***-height truck and railway bridge impact events were simulated in a 1:5 scale *** design parameters such as the stiffness of the crash beam and the bridge supports were scaled to evaluate different levels of *** experiments were conducted with five configurations consisting of four different types of crash beams and one no-crash beam *** results show that crash beams attenuate bridge total peak dynamic displacement responses between 14.5%and 35.7%,depending on the intensity of the impact and crash beam *** addition,the results show that the average effectiveness in attenuating residual deformation for all four crash beams ranges from 43.03%to 83.40%.Finally,various designs and their effectiveness against lateral impacts with different speeds are *** overall scope of this research is to provide objective information about the design of crash beams for railway bridges based on their response to over-height truck collisions at various speeds.

关键词： railway bridge over-height truck impact attenuation crash beam dynamic displacement scaled model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On Nonlinear Static and Dynamic Analysis and Emulation of Additional Forces in railway bridges (An Abstract of the Ph.D. Thesis)

引用

中国铁道科学 2001年第5期 138-140页

作者： YIN Cun xin 1,PAN Jia ying 2(Supervisor), ZHUANG Jun sheng 2(Supervisor) (1 Beijing General Municipal Engineering Design and Research Institute, Beijing 100045,China 2 China Academy of railway Sciences,Beijing\ 100081,China)

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Experimental investigation of damage identification for continuous railway bridges

引用

Journal of Modern Transportation 2012年第1期20卷 1-9页

作者： Deshan SHAN Chunyu FU Qiao LI School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

Considering the issue of misjudgment in railway bridge damage identification, a method combining the step- by-step damage detection method with the statistical pattern recognition is proposed to detect the structural damage of a railway continuous girder bridge. The whole process of damage identification is divided into three identification sub- steps, namely, damage early warning, damage location, and damage extent identification. The multi-class pattern clas- sification algorithm of C-support vector machine and the regression algorithm of c-support vector machine are engagedto identify the damage location and damage extent, respectively. For verifying the proposed method, both of the pro- posed method and the optimization method are used to deal with the measured data obtained from a specific railway continuous girder model bridge. The results show that the proposed method can not only identify the damage location correctly, but also obtain the damage extent which is consistent with the experimental results accurately. By uncou- pling finite element analysis and damage identification, normalizing the index, and seeking the separation hyper plane with maximum margin, the proposed method has more favorable advantages in generalization and anti-noise. As a re- sult, it has the ability to identify the damage location and extent, and can be applied to the damage identification in real bridge structures.

关键词： railway bridge damage identification support vector machine step by step model test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Safety and Applicability Evaluation of railway bridges in China

引用

Journal of Civil Engineering and Architecture 2010年第1期4卷 53-59页

作者： Yuling Zhang Li Wang Xianting Du Zhu Yu China Academy of railway Sciences Beijing 100081 China School of Civil Engineering Beoing Jiaotong University Beijing 100044 China

There are more than eight different design standards in use for the existing railway bridges in China, which have different applicabilities for bridges built in different periods. In this paper, the design load standards in different periods are introduced and compared; The working status of the railway is investigated. According to the developing trend of separating passenger and freight transports, by comparing the computed results of the bridge effect and the fatigue cumulative damage, the applicabilities of bearing capacity and fatigue are analyzed for existing bridges. The results indicate that the bearing capacities of 99% existing bridges are suitable for the demand of 26.5 t （axle-weight） freight trains. However, for culverts, bridges with spans less than 20 m, longitudinal and transverse beams of through bridges, suspenders of truss bridges and other locally-stressed members should be evaluated and reinforced due to the increasing axle-weight.

关键词： railway bridge safety fatigue passenger-freight separation.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mechanical performance analysis and stiffness test of a new type of suspension bridge

引用

Frontiers of Structural and Civil Engineering 2021年第5期15卷 1160-1180页

作者： Xia QIN Mingzhe LIANG Xiaoli XIE Huilan SONG College of Civil Engineering and Architecture Guangxi UniversityNanning 530004China

A new type of suspension bridge is proposed based on the gravity stiffness *** with a conventional suspension bridge,the proposed bridge adds rigid webs and cross *** rigid webs connect the main cable and main girder to form a truss that can improve the bending stiffness of the *** cross braces connect the main cables to form a closed space truss structure that can improve the torsional stiffness of the *** rigid webs and cross braces are installed after the construction of a conventional suspension bridge is completed to resist different loads with different structural forms.A new type of railway suspension bridge with a span of 340 m and a highway suspension bridge with a span of 1020 m were designed and analysed using the finite element *** stress,deflection of the girders,unbalanced forces of the main towers,and natural frequencies were compared with those of conventional suspension bridges.A stiffness test was carried out on the new type of suspension bridge with a small span,and the results were compared with those for a conventional *** results showed that the new suspension bridge had a better performance than the conventional suspension bridge.

关键词： new type of suspension bridge stiffness test mechanical performance railway bridge space truss

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A linear crack length measurement method for railway bridges based on calibration points fitting

引用

Journal of Measurement Science and Instrumentation 2020年第2期11卷 118-125页

作者： WANG Ji-wu YU Peng-fei LUO Hai-bao YU Pei-long School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Gansu Dahua Construction Engineering Co. LtdLanzhou 730030China

For the linear crack skeleton of railway bridges with irregular strike,it is difficult to accurately express the crack contour feature by using a single smoothing fitting *** order to improve the measurement accuracy,a polynomial curve fitting was proposed,which used the calibration point of crack contour as the boundary point,and then put them all together to produce a continuous contour curve to achieve the crack length *** method was tested by measuring the linar cracks with different *** is shown that this proposed algorithm can not only solve the jagged problem generated in the crack skeleton extraction process,but also improve the crack length measurement *** relative deviation is less than 0.15,and the measurement accuracy is over 98.05%,which provides a more effective means for the crack length measurement in railway bridges.

关键词： crack skeleton length measurement calibration point polynomial fitting railway bridge

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：