新型柔性限高架动力分析  

Dynamic Analysis of a New Type of Flexible Height Restriction Barrier

作　　者：朱文彬 罗辉[2] ZHU Wenbin;LUO Hui(Central-Southern Safety&Environment Technology Institute Co Ltd,Wuhan 430051,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中南安全环境技术研究院股份有限公司,湖北武汉430051 [2]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《土木工程与管理学报》2022年第6期146-154,共9页Journal of Civil Engineering and Management

基　　金：国家重点研发计划(2021YFF0501003);国家自然科学基金(52078233,51838006)。

摘　　要：本文提出一种新型装配式柔性限高架,即设置有橡胶缓冲层、弹簧铰支座、横梁薄弱点三级防护措施的双层框架结构。介绍了新型柔性限高架的设计,并利用LS-DYNA建立车辆及限高架仿真模型。经横梁薄弱点螺栓分析确定控制螺栓,确定第二峰值为螺栓破坏轴力。从能量、变形、加速度三方面对两类限高架遭受冲击时性能进行对比。结果表明,相比刚性限高架柔性限高架最大柱顶位移减少了56%,车辆最大切削深度减少了89%,避免限高架倒塌或车辆削顶情况的出现;车辆动能减少了34.6%,内能降低了64.3%,对车辆与限高架造成的损伤均较小;在极大降低车辆加速度的同时,最初的上升型波形转换为下降型波形,对驾乘人员伤害更小。This paper presents a new type of assembled flexible height restriction barrier,which is a double-layer frame structure with rubber buffer layer,spring hinge support,middle weak point three-level protection measures.The design of the assembled flexible height restriction barrier is introduced,and the simulation model is established by LS-DYNA.The control bolt is determined by bolt analysis of the middle weak point,and the second peak is determined to be the breaking axis force.The performance of the two kinds of height restriction barrier under impact is compared from three aspects of energy,deformation and acceleration.The results show that,compared with the rigid height restriction,the maximum column top displacement of the flexible height restriction barrier is reduced by 56% and the maximum cutting depth of the vehicle is reduced by 89%,which avoids the collapse of the height restriction barrier or the roof cutting of the vehicle.The kinetic energy of the vehicle is reduced by 34.6%,the internal energy is reduced by 64.3%,leading to small damage to the vehicle and the height restriction barrier.At the same time,the acceleration of the vehicle is greatly reduced,the initial rising waveform is converted to the falling waveform,which is less harmful to the driver and passengers.

关 键 词：限高架 碰撞动力响应 有限元分析 

分 类 号：U491.59[交通运输工程—交通运输规划与管理]