基于SB级波形梁护栏的有效高度保持设计研究

Research on the Design of Effective Height Maintenance Based on SB Class Corrugated Beam Guardrail

摘要:

针对现有SB级波形梁护栏在路面加铺后有效高度下降、防护性能衰减的问题，提出一种融合动态变形补偿与静态高度调节的双机制协同保持设计方案。通过构建类平行四边形防阻块结构，能实现碰撞过程中的动态抬升补偿，最大动态补偿量可达175 mm；配合立柱预留孔系模块化调节系统，可实现100 mm加铺厚度下的高度调节。另外，基于有限元方法建立模型，依据《公路护栏安全性能评价标准》（JTG B05-01—2013）开展碰撞仿真，并在小型客车、中型客车和大型货车撞击工况下进行实车足尺试验验证。结果表明：该护栏在加铺前后的各项安全指标均符合上述标准要求，其有效高度保持稳定，且具备施工便捷、经济高效的特点。研究成果为解决公路护栏在改扩建工程中的高度适应性难题提供了系统性解决方案，具有重要的工程应用价值。

Abstract:

Aiming at the problem of reduced effective height and diminished protective performance of existing SB-level wavy-beam guardrails after pavement overlay, this study proposes a dual-mechanism cooperative maintenance design scheme that integrates dynamic deformation compensation and static height adjustment. By constructing a parallelogram-like blocking device structure, dynamic lift compensation during collisions is achieved, with a maximum dynamic compensation of 175 mm. Coupled with a modular adjustment system utilizing reserved holes on the guardrail posts, height adjustment for an overlay thickness of 100 mm is realized. In addition, a model was established based on the finite element method, and collision simulations were conducted in accordance with the Highway Guardrail Safety Performance Evaluation Standard (JTG B05-01—2013). Full-scale vehicle impact tests were carried out under conditions involving small passenger cars, medium buses, and large trucks. The results show that the guardrail meets all safety specification requirements both before and after overlay construction, maintains stable effective height, and offers advantages such as convenient construction and cost-effectiveness. This research provides a systematic solution to the challenge of height adaptability of highway guardrails in reconstruction and expansion projects, demonstrating significant engineering application value.