高速公路旧路护栏及分隔带开口活动护栏安全性能提升方案设计

发布时间：2018-01-29 16:13

本文关键词： 高速公路道路安全护栏防撞能力　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：高速公路改扩建,原道路护栏难以达到《公路交通安全设施设计规范》(JTG/T D8-2006,简称新规范)对护栏强度的要求,但整体上旧路护栏外观完好,仍具有很高的防撞能力,如果将旧护栏废弃,会造成严重的资源浪费。本文针对旧波形梁护栏提出了升级改造方案,以提高旧护栏强度,针对常规移动式混凝土活动护栏灵活性和防撞能力不能兼顾问题,设计了新型混凝土活动护栏。在新规范要求的碰撞条件下,本文采用车辆与护栏碰撞的双自由度模型计算碰撞力,并考虑护栏立柱主要承受弯矩作用,计算了立柱最大弯矩的取值与作用位置。在此基础上,根据新、旧规范中护栏几何形式的差异,提出了旧护栏的加固改造方案。(1)在旧护栏立柱上加横隔梁,用以弥补波形梁板厚度的不足,并对横隔梁的设置形式进行了设计;(2)通过在旧护栏立柱底部钻孔下探并浇筑混凝土,从而解决护栏埋深不足问题,使其抗拔能力达到新规范立柱抗拔性能的要求;(3)在旧立柱中浇筑自密实混凝土,并配置钢筋,用以弥补旧立柱孔径小及腐蚀导致的强度不足问题。本文还设计了一种新型混凝土活动护栏,通过在混凝土中埋设升降装置,并在装置底部增加脚轮,从而在充分利用混凝土护栏防撞能力强的特点下,实现了开放时的快速、灵活地移动,参照新规范碰撞要求,对混凝土活动护栏的截面形式、配筋、活动装置进行了设计。最后,本文利用仿真软件对改造后的波形梁护栏和混凝土活动护栏进行了仿真试验。在相同的碰撞条件下,升级改造后的护栏能够有效拦阻失控车辆,车辆未发生骑跨、穿越和横转现象,车辆加速度、波形梁最大位移均能满足新规范的要求,防撞性能甚至优于新规范护栏。混凝土活动护栏防撞能力也达到了新规范规定值,碰撞过程中车辆的加速度等条件均能满足规范要求。
[Abstract]:Highway reconstruction and extension, the original road guardrail is difficult to meet the "Road Traffic Safety facilities Design Code", JTG / T D8-2006, referred to as the new code) for the strength of the guardrail. But on the whole the old road guardrail looks intact and still has a high ability of collision prevention. If the old guardrail is abandoned it will cause serious waste of resources. This paper proposes an upgrade scheme for the old corrugated beam guardrail. In order to improve the strength of the old guardrail and to solve the problem that the flexibility and anti-collision ability of the conventional movable concrete guardrail can not be taken into account, a new type of concrete movable guardrail is designed under the condition of collision required by the new specification. In this paper, the collision force is calculated by using the two-degree-of-freedom model of vehicle and guardrail collision, and the maximum moment of column is calculated and the position of action is calculated by taking into account the moment action of column column. On this basis, according to the new method. In order to make up for the shortage of the thickness of the corrugated beam, this paper puts forward the retrofit scheme of the old guardrail, which is the difference of the geometric form of the guardrail, and puts forward the method of strengthening and reforming the old guardrail column by adding the transverse beam to the column of the old guardrail. The setting form of the diaphragm beam is also designed. (2) by drilling and pouring concrete at the bottom of the old guardrail column, the problem of insufficient burying depth of the guardrail can be solved, and the pullout resistance of the column can meet the requirements of the new code. (3) pouring self-compacting concrete into old columns and installing steel bars to make up for the insufficient strength caused by the small aperture and corrosion of the old columns. A new type of concrete movable guardrail is also designed in this paper. By installing lifting device in concrete and adding casters to the bottom of the device, the rapid and flexible movement of the concrete guardrail can be realized under the characteristics of strong anti-collision ability of concrete guardrail. According to the impact requirements of the new code, the section form, reinforcement and movable device of the concrete movable guardrail are designed. In this paper, simulation tests of corrugated beam guardrail and concrete movable guardrail are carried out by using simulation software. Under the same impact conditions, the upgraded guardrail can effectively block out of control vehicle. The phenomena of vehicle riding, crossing and crossing, vehicle acceleration and maximum displacement of the waveform beam can meet the requirements of the new code. The anti-collision capability of the concrete movable guardrail is even better than that of the new code, and the anti-collision capability of the concrete movable guardrail also reaches the specified value of the new code, and the acceleration of the vehicle during the collision process can meet the requirements of the specification.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U417.12

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