摘要
为了分析动荷载作用下板底脱空对水泥板弯沉的影响,建立了ANSYS三维有限元分析模型,利用移动荷载模拟车辆动荷载,隐单元模拟不同形式和程度的脱空,对比了脱空前后水泥板弯沉和应力的变化.结果表明:即使在传荷能力优良时,接缝处弯沉也会随着脱空面积的增大而增大,导致水泥板所受应力变大,最大等效应力值达0.87 MPa,是未脱空板块的235%,恶化了水泥板的受力状态,加速疲劳破坏;由于传荷能力较好,两侧弯沉同时增大,弯沉差不明显,通过弯沉差很难检验出脱空病害的存在,双侧脱空更具隐蔽性.需要准确的检测方法探测板底脱空的位置,对脱空位置及时进行注浆养护,避免单侧板底脱空发展为双侧脱空,改善脱空板的受力状况延长水泥路面使用寿命.
In order to illum inate the effect of slab void on deformation under dynamic bading, this paper established a three-dinensional finite element model through the employment of moving bading and hiding element to sinulate the dynamic bading of vehicle action and the void, respectively The deformation and stressstrain of slabswere compared before and after the void The result shows that even though the ＇joins＇ bading transfer capability workswell, deformatbns of slab on joins grow greatly with the increasing void The deformation and stress on comers of two-side slab void are aggrandized remarkably, and the maxinum equivalent stress gets to 0.87 Mpa, which is 2.35 tines of those on un-void slah This worsens the mechanical state of slabs and accelerates the fatigue failure The deformation difference is uncon spicuous because of the deformations on two adjacent slabs glowing to gether due to the good loading transfer capability, thus two-sides slab voids are more difficult to be found by observing deformation difference Therefore it is necessary to put forward a method to detect the position of void exactly, and then pour slurry on slabs in time to inprove the slab＇ s stress state and prolong the service life of concrete road
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2009年第4期37-41,共5页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(50808058)
教育部2006年度新世纪优秀人才支持计划资助项目(2006348)
“十一五”国家科技支撑计划重点资助项目(2006BAJ18B05)
关键词
道路工程
水泥路面
板底脱空
动荷载
弯沉差
road engineering
cement concrete pavement
slab void
dynamic bading
deformation difference
