冲击荷载作用下道路护栏设计计算方法研究
发布时间：2019-04-23 07:59
【摘要】：：鉴于我国波形梁半刚性道路护栏的设计主要是借鉴国外成熟的护栏结构形式,而缺乏自身理论设计体系,故在交通行业重点实验开放课题资金的资助下对汽车碰撞荷载下波形梁钢护栏的设计计算方法展开研究,力图为交通行业重点实验室研发新式护栏结构提供理论依据和指导。 通过对车辆与护栏碰撞过程进行分析,建立考虑应变率强化效应的护栏碰撞力设计值计算模型；根据实车足尺试验结果和有限元仿真分析结果建立护栏的破坏模式；应用能量平衡原理计算结构破损的极限荷载,进而建立波形梁钢护栏的设计计算方法。 通过对A级波形梁钢护栏结构的设计和有限元仿真校核,证明新建立设计方法的合理性。通过将新建立的设计计算方法与另外两种国内外现有设计方法进行对比分析,得到新方法的各项指标与有限元仿真碰撞试验结果最相近,从而证明新设计方法的优越性。 由于理论设计方法无法控制车辆运行姿态的相关指标,考虑借助车辆—护栏碰撞有限元模拟实验进行补充设计。通过对不同波形梁板厚度和立柱壁厚度的护栏结构进行仿真分析,得到了梁板和立柱刚度对护栏控制车辆运行姿态的影响规律,可用于对满足初步设计的护栏结构的筛选。 通过新设计体系完成了对A级碰撞条件下的波形梁钢护栏的结构改进,提出了3种满足防撞性能要求的改进护栏结构,并采用车辆—护栏碰撞有限元模拟实验对其进行完整的防撞性分析,可为A级护栏的研发提供足尺实车试验备选方案。
[Abstract]:In view of the fact that the design of semi-rigid guardrail of corrugated beam in our country is mainly based on the mature structure form of guardrail in foreign countries, but lack of its own theoretical design system, Therefore, the design and calculation method of corrugated beam steel guardrail under vehicle collision load is studied under the fund of the key experiment opening project in the transportation industry, in order to provide the theoretical basis and guidance for the research and development of the new guardrail structure in the key laboratory of the transportation industry. Through the analysis of the collision process between the vehicle and the guardrail, the calculation model of the design value of the guardrail impact force considering the strain rate enhancement effect is established, and the failure mode of the guardrail is established according to the full-scale test results of the vehicle and the results of finite element simulation. The principle of energy balance is applied to calculate the ultimate load of structural damage, and then the design and calculation method of corrugated beam steel guardrail is established. The rationality of the new design method is proved by the design and finite element simulation of the A-level corrugated steel guardrail structure. Through the comparison and analysis between the newly established design calculation method and the other two existing design methods at home and abroad, it is found that the indexes of the new method are most similar to the results of finite element simulation collision test, which proves the superiority of the new design method. Because the theoretical design method can not control the relative indexes of vehicle running attitude, the supplementary design is considered by means of vehicle-guardrail collision finite element simulation experiment. Based on the simulation analysis of guardrail structure with different thickness of beam-plate and column wall, the influence of beam-plate and column stiffness on the running attitude of guardrail control vehicle is obtained, which can be used to screen the guardrail structure which satisfies the preliminary design. Through the new design system, the structural improvement of the corrugated beam steel guardrail under the condition of A-level collision is completed, and three kinds of improved guardrail structures which meet the requirements of anti-collision performance are put forward. The vehicle-guardrail collision finite element simulation experiment is used to carry out the complete anti-collision analysis, which can provide a full-scale vehicle test alternative for the research and development of class A guardrail.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U417.12
本文编号：2463272
[Abstract]:In view of the fact that the design of semi-rigid guardrail of corrugated beam in our country is mainly based on the mature structure form of guardrail in foreign countries, but lack of its own theoretical design system, Therefore, the design and calculation method of corrugated beam steel guardrail under vehicle collision load is studied under the fund of the key experiment opening project in the transportation industry, in order to provide the theoretical basis and guidance for the research and development of the new guardrail structure in the key laboratory of the transportation industry. Through the analysis of the collision process between the vehicle and the guardrail, the calculation model of the design value of the guardrail impact force considering the strain rate enhancement effect is established, and the failure mode of the guardrail is established according to the full-scale test results of the vehicle and the results of finite element simulation. The principle of energy balance is applied to calculate the ultimate load of structural damage, and then the design and calculation method of corrugated beam steel guardrail is established. The rationality of the new design method is proved by the design and finite element simulation of the A-level corrugated steel guardrail structure. Through the comparison and analysis between the newly established design calculation method and the other two existing design methods at home and abroad, it is found that the indexes of the new method are most similar to the results of finite element simulation collision test, which proves the superiority of the new design method. Because the theoretical design method can not control the relative indexes of vehicle running attitude, the supplementary design is considered by means of vehicle-guardrail collision finite element simulation experiment. Based on the simulation analysis of guardrail structure with different thickness of beam-plate and column wall, the influence of beam-plate and column stiffness on the running attitude of guardrail control vehicle is obtained, which can be used to screen the guardrail structure which satisfies the preliminary design. Through the new design system, the structural improvement of the corrugated beam steel guardrail under the condition of A-level collision is completed, and three kinds of improved guardrail structures which meet the requirements of anti-collision performance are put forward. The vehicle-guardrail collision finite element simulation experiment is used to carry out the complete anti-collision analysis, which can provide a full-scale vehicle test alternative for the research and development of class A guardrail.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U417.12
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