摘要
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。
To improve traffic safety of continuous long downgrade section of an expressway,one type of combined barrier was designed with an energy-absorbing steel pipe settled along a steel beam,it had the double functions of crashworthiness and vehicle speed-reducing.Based on design of a flange slab for a local bridge,the anchoring strength was checked for the barrier foundation and the flange slab was strengthened through placing the additional steel bars in the deck.Full-scale impact tests were conducted to validate the safety performance of this barrier.It was shown that the crashworthiness of this barrier can reach a SS level;the energy-absorbing pipe deforms while vehicles pass along this barrier;the vehicle kinetic energy is changed into the internal energy of the energy-absorbing pipe and the speed of a vehicle is reduced effectively;because of the settlement of the energy-absorbing pipe,the steel beam has little deformation to reduce maintenance after a crash;the energy-absorbing pipe does not cause an adverse effect on vehicle running;the maximum strain appears at the bottom of the barrier surface facing impacts;the additional steel bars placed in the deck can share impact loads and the anchoring strength of the barrier foundation can meet the requirements to bear forces.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第13期1-5,12,共6页
Journal of Vibration and Shock
基金
西部交通建设科技项目(200731800003)
关键词
护栏
消能减速
实车碰撞试验
钢管变形吸能
barrier
function of vehicle speed-reducing
full-scale impact test
energy-absorbing steel pipe by deformation
