检索结果-南通市图书馆

Influence of span-to-depth ratio on dynamic response of vehicle-turnoutbridge system in high-speed railway

High-Speed Railway 2024年第1期2卷 30-41页

作者： Chuanqing Dai Tao Xin Shenlu Qiao Yanan Zhang Pengsong Wang Mahantesh M.Nadakatti School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China China Railway Engineering Design and Consulting Group Co. Ltd.Beijing 100070China Karnatak Law Society’s Gogte Institute of Technology Belagavi 590006India

For high-speed railways,the smoothness of the railway line significantly affects the operational speed of *** the train passes through the turnout on a long-span bridge,the wheel-rail impacts caused by the turnout structure irregularities,and the instability arising from the bridge's flexural deformation lead to a strong coupling effect in the vehicle-turnout-bridge *** significantly affects both ride comfort and operational *** addressing this issue,the present study considered a long-span continuous rigid-frame bridge as an example and established a train-turnout-bridge coupled dynamic model of high-speed *** a selfdeveloped dynamic simulation program,the study analysed the dynamic response characteristics when the train passes through the turnouts on the *** also investigated the influence of different span-to-depth ratios of the bridge on the vehicle dynamic response when the train passes through the main line and branch line of turnouts and then proposed a span-to-depth ratio limit value for a long-span continuous rigid-frame *** research findings suggest that the changes in the span-to-depth ratio have a relatively minor impact on the train’s operational performance but significantly affect the dynamic characteristics of the bridge *** on the findings and a comprehensive assessment of safety indicators,it is advisable to establish a span-to-depth ratio limit of 1/4500 for a long-span continuous rigid-frame bridge.

关键词： Turnout on bridge span-to-depth ratio Dynamic response Vehicle-turnout-bridge system High-speed railway

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

Impact performance of BFRP and steel-reinforced concrete beams with different span-to-depth ratios:Numerical and analytical studies

引用

Science China(Technological Sciences) 2023年第2期66卷 301-319页

作者： LAN YuChang ZHANG RenBo JIN Liu DU XiuLi Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China Department of Civil Engineering Tsinghua UniversityBeijing 100084China

Many studies have focused on reinforced concrete(RC)slender beams,while there is a paucity of studies on deep ***,there is a lack of studies on the impact performance of FRP-reinforced concrete *** this study,a 3-D numerical model was established to explore the impact behavior of the basalt fiber reinforced polymer(BFRP)and steelreinforced concrete beams with different span-to-depth ratios(l0/h).The effects of impact mass and tension reinforcement ratio were analyzed and *** is determined that the impact behavior of the shortest beam with l0/h=1.5 corresponds to punching shear failure,which is distinctive from the other deep *** l0/h exceeds 3.0,the failure mode gradually changes from shear dominant to flexural *** increase in the impact mass leads to a linear increase in the max midspan deflection,the duration of the contact between the hammer and member,and the duration of the dynamic reaction *** max midspan deflection has a negative correlation with the reinforcement *** max reaction force increases with an increase in the reinforcement ratio,which is more evident for higher l0/*** failure mode of the BFRP-reinforced concrete beam is similar to that of the steel-reinforced *** the impact condition,in this study,part of the steel bars yield,whereas BFRP bars exhibit no signs of fracture because of their higher tensile strength and better deformability.A simplified calculational method based on energy is proposed in this study,and the method accurately predicts the residual deflection of the concrete beams with different l0/***,it is established that it is difficult to reproduce the impact response of the deep beams via the singledegree-of-freedom(SDOF)model,which is based on the assumption of the same deflection shape as that of slender ***,a more rational simplified model for deep beams under impact loads is still required.

关键词： impact BFRP-reinforced concrete beam span-to-depth ratio simplified method

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

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

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：