轨道梁作为跨座式单轨交通三大核心技术之一,其核心技术的创新与发展一直都是制约我国单轨交通发展的重要因素之一。结合“新型25 m PC轨道梁优化设计与制造工艺”课题,自主开发了“PC轨道梁配筋计算程序”和“PC轨道梁标准定型化设计...轨道梁作为跨座式单轨交通三大核心技术之一,其核心技术的创新与发展一直都是制约我国单轨交通发展的重要因素之一。结合“新型25 m PC轨道梁优化设计与制造工艺”课题,自主开发了“PC轨道梁配筋计算程序”和“PC轨道梁标准定型化设计软件”,并设计完成了跨座式单轨交通新型25 m PC轨道梁。通过智能软件自动生成25 m PC轨道梁的预应力钢筋和普通钢筋布置图,对轨道梁进行足尺25 m PC轨道梁静载、扭转、开裂、300万次疲劳和破坏试验验证。为验证新型25 m PC轨道梁优化设计与软件计算的正确性,将其试验数据与自制软件计算出的数据和理论数据进行对比。结果表明:软件自动设计的轨道梁,最大竖向挠度实测值为21.75 mm,校验系数为0.89,挠跨比为1/1122,而水平挠度实测值为2.36 mm,校验系数为0.72,满足规范要求;结合偏心及中心加载两种工况下试验结果,梁体应力差值在-0.51~0.61 MPa之间,扭转对直梁影响较小;开裂试验中,实测开裂荷载值为947 kN,实测重裂荷载为707 kN,由此得到梁体实际有效预应力975.26 MPa,实测值略大于设计有效预应力972.26 MPa,上述数据说明自动绘制的配筋图可以用于实际工程中。开发的智能软件对跨座式单轨交通轨道梁的智能建造提供技术支撑。展开更多
Urban transportation systems are facing severe challenges due to the rapid growth of the urban population,especially in China.Suspended monorail system(SMS),as a sky rail transportation form,can effectively alleviate ...Urban transportation systems are facing severe challenges due to the rapid growth of the urban population,especially in China.Suspended monorail system(SMS),as a sky rail transportation form,can effectively alleviate urban traffic congestion due to its independent right-of-way and minimal ground footprint.However,the SMS possesses a special traveling system with unique vehicle structure and bridge configuration,which results in significant differences in both the mechanisms and dynamics problems associated with train–bridge interaction(TBI)when contrasted with those of traditional railway systems.Therefore,a thorough understanding of the SMS dynamics is essential for ensuring the operational safety of the system.This article presents a state-of-the-art review of the TBI modeling methodologies,critical dynamic features,field tests,and practice of the SMS in China.Firstly,the development history,technical features,and potential dynamics problems of the SMS are briefly described,followed by the mechanical characteristics and mechanisms of the train–bridge interactive systems.Then,the modeling methodology of the fundamental elements in the suspended monorail TBI is systematically reviewed,including the suspended train subsystem,bridge subsystem,train–bridge interaction relationships,system excitations,and solution method.Further,the typical dynamic features of the TBI under various operational scenarios are elaborated,including different train speeds,a variety of line sections,and a natural wind environment.Finally,the first new energy-based SMS test line in the world is systematically introduced,including the composition and functionality of the system,the details of the conducted field tests,and the measured results of the typical dynamic responses.At the end of the paper,both the guidance on further improvement of the SMS and future research topics are proposed.展开更多
文摘轨道梁作为跨座式单轨交通三大核心技术之一,其核心技术的创新与发展一直都是制约我国单轨交通发展的重要因素之一。结合“新型25 m PC轨道梁优化设计与制造工艺”课题,自主开发了“PC轨道梁配筋计算程序”和“PC轨道梁标准定型化设计软件”,并设计完成了跨座式单轨交通新型25 m PC轨道梁。通过智能软件自动生成25 m PC轨道梁的预应力钢筋和普通钢筋布置图,对轨道梁进行足尺25 m PC轨道梁静载、扭转、开裂、300万次疲劳和破坏试验验证。为验证新型25 m PC轨道梁优化设计与软件计算的正确性,将其试验数据与自制软件计算出的数据和理论数据进行对比。结果表明:软件自动设计的轨道梁,最大竖向挠度实测值为21.75 mm,校验系数为0.89,挠跨比为1/1122,而水平挠度实测值为2.36 mm,校验系数为0.72,满足规范要求;结合偏心及中心加载两种工况下试验结果,梁体应力差值在-0.51~0.61 MPa之间,扭转对直梁影响较小;开裂试验中,实测开裂荷载值为947 kN,实测重裂荷载为707 kN,由此得到梁体实际有效预应力975.26 MPa,实测值略大于设计有效预应力972.26 MPa,上述数据说明自动绘制的配筋图可以用于实际工程中。开发的智能软件对跨座式单轨交通轨道梁的智能建造提供技术支撑。
基金supported by the National Natural Science Foundation of China(Grant Nos.52202483,52108476,and 52388102)。
文摘Urban transportation systems are facing severe challenges due to the rapid growth of the urban population,especially in China.Suspended monorail system(SMS),as a sky rail transportation form,can effectively alleviate urban traffic congestion due to its independent right-of-way and minimal ground footprint.However,the SMS possesses a special traveling system with unique vehicle structure and bridge configuration,which results in significant differences in both the mechanisms and dynamics problems associated with train–bridge interaction(TBI)when contrasted with those of traditional railway systems.Therefore,a thorough understanding of the SMS dynamics is essential for ensuring the operational safety of the system.This article presents a state-of-the-art review of the TBI modeling methodologies,critical dynamic features,field tests,and practice of the SMS in China.Firstly,the development history,technical features,and potential dynamics problems of the SMS are briefly described,followed by the mechanical characteristics and mechanisms of the train–bridge interactive systems.Then,the modeling methodology of the fundamental elements in the suspended monorail TBI is systematically reviewed,including the suspended train subsystem,bridge subsystem,train–bridge interaction relationships,system excitations,and solution method.Further,the typical dynamic features of the TBI under various operational scenarios are elaborated,including different train speeds,a variety of line sections,and a natural wind environment.Finally,the first new energy-based SMS test line in the world is systematically introduced,including the composition and functionality of the system,the details of the conducted field tests,and the measured results of the typical dynamic responses.At the end of the paper,both the guidance on further improvement of the SMS and future research topics are proposed.
