摘要
为更准确地分析沥青桥面铺装的动力学响应特性,提出基于实际车辆建模的车-路-桥动力学分析方法,研究多车载荷作用下沥青桥面铺装动力学行为。以一座钢-混凝土工字组合梁桥为例,考虑桥梁振动对桥面铺装的影响,通过数值模拟建立单车-桥面铺装动力学耦合模型,并与不考虑耦合、移动荷载作用下的传统模型进行比较,验证了耦合模型的正确性及考虑耦合的必要性;基于单车-桥面铺装耦合模型,研究多车荷载作用下沥青桥面铺装层的响应行为;分析了双车并行和双车偏载工况下,桥面铺装各层的应力和挠度响应,并与单车工况进行比较,可见多车对桥面铺装的动力学响应的影响不容忽视。研究结果表明:偏载改变了桥面铺装层横向应力的方向,在沥青层顶面和沥青-混凝土接触面,出现拉应力,故沥青铺装顶面容易出现纵向裂缝,横向最大拉应力发生在沥青层和混凝土层接触面;桥面铺装层最大纵向应力发生在沥青层和混凝土层接触面上,双车并行时,沥青层与混凝土层间所产生的纵向应力较单车行驶时增加了52.7%;偏载时剪应力最大,且最大剪应力发生在混凝土层和钢梁的接触面上,该接触面容易脱离,应采取抗剪措施;不同桥面铺装层最大挠度均发生在双车并行工况下,相比单车工况,挠度值可增大约64%。与单车作用相比,考虑多车-桥面铺装耦合对桥面铺装层设计及损伤控制提出更高要求。
In order to analyze dynamic response characteristics of asphalt bridge deck pavement more accurately,a vehicle-road-bridge dynamic analysis method based on actual vehicle modeling was proposed to study dynamic behavior of asphalt bridge deck pavement under multi-vehicle load.Taking a steel-concrete I-shaped composite girder bridge as an example,considering effects of bridge vibration on deck pavement,the single vehicle-deck pavement coupled dynamic model was established through numerical simulation,and compared with the traditional model without considering coupling and moving load to verify the correctness of the coupling model and the necessity of considering coupling.Based on the single vehicle-deck pavement coupled model,dynamic response behavior of asphalt deck pavement under multi-vehicle load was studied.Stress and deflection responses of each layer of bridge deck pavement under double-vehicle in parallel and double-vehicle eccentric load conditions were analyzed,and compared with those under single vehicle conditions.The study results showed that eccentric load changes the direction of transverse stress of bridge deck pavement,tensile stress appears on top surface of asphalt layer and asphalt-concrete interface,so longitudinal cracks are easy to appear on top surface of asphalt pavement,and the maximum transverse tensile stress occurs on asphalt-concrete interface;the maximum longitudinal stress of bridge deck pavement occurs at asphalt-concrete interface;when two cars running in parallel,the longitudinal stress at asphalt-concrete interface increases by 52.7%compared with that during single vehicle running;shear stress is the maximum under eccentric load,it occurs at concrete-steel beam interface,and this interface is easy to separate,so anti-shear measures should be taken;largest deflections of different bridge deck pavements all occur under the condition of double-vehicle running in parallel,and their values can increase by 64%compared with those under single vehicle running condition;compared with act
作者
张霞
陈恩利
李凌云
ZHANG Xia;CHEN Enli;LI Lingyun(State Key Laboratory of Mechanical Behavior in Traffic Engineering Structureand System Safety,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第11期109-115,133,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(11172183,11872255)。
关键词
桥梁工程
桥面铺装
数值模拟
多车
耦合
偏载
bridge engineering
bridge deck pavement
numerical simulation
multi-vehicle
coupling
eccentric load
