组合式消能减速护栏实车碰撞试验研究

为了提高高速公路连续长大下坡路段的行车安全性，基于钢管构件变形吸能机理，设计出一种具有防撞和减速双重功能的组合式桥梁护栏。结合依托工程现场桥梁翼缘板情况，进行护栏基础锚固强度验算，通过在桥面现浇层增设钢筋的方式进行翼缘板加强，采用实车碰撞试验方法进行护栏安全性能检验。根据试验结果可知：护栏防撞等级可达到SS级（520kJ）；车辆贴靠碰撞减速护栏时吸能钢管变形吸能，有效降低车速；吸能钢管的设置使护栏横梁几乎没有变形，减小了碰撞后的维护工作量；吸能钢管的设置没有对车辆碰撞护栏过程的行驶姿态造成不利影响；根据钢筋应变测试数据可知，护栏迎撞面根部对应的钢筋应变值最大，桥面现浇层加强钢筋可以有效分担碰撞荷载，护栏基础锚固强度满足受力要求。

Study on Full-Scale Impact Test of Combined Barrier for Vehicle Speed-reducing

To improve traffic safety of continuous long downgrade section in expressway, one type of combined barrier was designed with an energy-absorbing steel pipe settled along the steel beam, which had the double function of crashworthiness and vehicle speed-reducing. Based on the design of flange slab for local bridge, the anchoring strength was checked for barrier foundation and the flange slab was strengthened through the additional steel bars in the deck. Full-scale impact tests were conducted to validate safety performance of this barrier. The crashworthiness of this barrier can reach SS level. The energy absorbing pipe deforms while vehicles pass along this barrier. The vehicle kinetic energy is changed into internal energy of energy absorbing pipe and the speed of vehicle is reduced effectively. Because of the settlement of energy absorbing pipe the steel beam has little deformation, which helps to reduce the maintenance workload after crash. Energy absorbing pipe does not cause adverse effect on vehicle running posture or cause the vehicle to snagging. The strain maximum of steel in deck and flange slab lies in the position of barrier traffic side bottom. The additional steel bars in the deck can participate in carrying the impact load and the anchoring strength of barrier foundation is proved to be enough.