解放军理工大学学报（自然科学版）
解放軍理工大學學報（自然科學版）
해방군리공대학학보（자연과학판）
JOURNAL OF PLA UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)
2015年
4期
338-344
,共7页
机场%水泥道面%嵌缝材料%接缝位移%结构应力
機場%水泥道麵%嵌縫材料%接縫位移%結構應力
궤장%수니도면%감봉재료%접봉위이%결구응력
airport%cement concrete pavement%sealants%displacement of j oints%structural stress
为深入研究机场道面接缝缝槽的水平和竖向位移对于嵌缝材料黏附性失效和嵌缝材料挤出的影响,采用有限元分析的手段,计算机场水泥道面接缝缝槽在环境温度和湿度变化下引起的缝槽水平位移量,以及飞机荷载作用引起的缝槽竖向位移量,并与实际观测数据进行对比分析.计算表明,机场水泥道面接缝缝槽水平位移量为2．2 mm左右,拉伸应变量可取为25％,与公路水泥路面基本相当；接缝缝槽的竖向位移量处于0．25~0．61 mm,剪切应变量处于3．1％~7．7％,较公路水泥路面大一些.选择包含弹簧单元及Kelvin模型的三参数固体模型描述嵌缝材料的流变特性,通过拉伸松弛实验实际测定3种典型嵌缝材料的弹簧系数和黏壶系数,利用缝槽内嵌缝材料拉伸应力和剪切应力的简化计算公式,计算3种典型嵌缝材料极限状态下的结构应力,结果表明,嵌缝材料的结构应力主要来自于接缝水平位移所引起的拉伸应力,剪切应力与接缝传荷能力的变化密切相关.
為深入研究機場道麵接縫縫槽的水平和豎嚮位移對于嵌縫材料黏附性失效和嵌縫材料擠齣的影響,採用有限元分析的手段,計算機場水泥道麵接縫縫槽在環境溫度和濕度變化下引起的縫槽水平位移量,以及飛機荷載作用引起的縫槽豎嚮位移量,併與實際觀測數據進行對比分析.計算錶明,機場水泥道麵接縫縫槽水平位移量為2．2 mm左右,拉伸應變量可取為25％,與公路水泥路麵基本相噹；接縫縫槽的豎嚮位移量處于0．25~0．61 mm,剪切應變量處于3．1％~7．7％,較公路水泥路麵大一些.選擇包含彈簧單元及Kelvin模型的三參數固體模型描述嵌縫材料的流變特性,通過拉伸鬆弛實驗實際測定3種典型嵌縫材料的彈簧繫數和黏壺繫數,利用縫槽內嵌縫材料拉伸應力和剪切應力的簡化計算公式,計算3種典型嵌縫材料極限狀態下的結構應力,結果錶明,嵌縫材料的結構應力主要來自于接縫水平位移所引起的拉伸應力,剪切應力與接縫傳荷能力的變化密切相關.
위심입연구궤장도면접봉봉조적수평화수향위이대우감봉재료점부성실효화감봉재료제출적영향,채용유한원분석적수단,계산궤장수니도면접봉봉조재배경온도화습도변화하인기적봉조수평위이량,이급비궤하재작용인기적봉조수향위이량,병여실제관측수거진행대비분석.계산표명,궤장수니도면접봉봉조수평위이량위2．2 mm좌우,랍신응변량가취위25％,여공로수니로면기본상당；접봉봉조적수향위이량처우0．25~0．61 mm,전절응변량처우3．1％~7．7％,교공로수니로면대일사.선택포함탄황단원급Kelvin모형적삼삼수고체모형묘술감봉재료적류변특성,통과랍신송이실험실제측정3충전형감봉재료적탄황계수화점호계수,이용봉조내감봉재료랍신응력화전절응력적간화계산공식,계산3충전형감봉재료겁한상태하적결구응력,결과표명,감봉재료적결구응력주요래자우접봉수평위이소인기적랍신응력,전절응력여접봉전하능력적변화밀절상관.
To study the influence of horizontal and vertical displacements of j oint on the cohesion failure and extrusion of the sealants in rigid pavement of airports,the displacement of the j oint and structural stress of the sealants were researched.Horizontal displacement caused by environmental temperature & humidity and vertical displancement caused by airplane loads were calculated separately by the finite element meth-ods,and the data of in-situ were compared with these calculation results.It is suggested that about 2.2 mm (corresponding to 25% tensile strain)of the horizontal displacement and 0.25—0.61 mm (corresponding to 3.1%—7.7% shear strain)of the vertical displacement are reasonable as the parameters for calculating the structural stress of sealants in concrete pavement j oints.The model containing of a spring element and a Kelvin model was used for depicting the sealants viscoelasticity performance,and three representative seal-ants were tested in order to achieve the coefficient of two springs and one dashpot by the stress relaxation experiments.Using the simplified tensile and shear stress calculation formula,the structural stresses of the three representative sealants were calculated,and it shows that the stress of sealants mainly comes from the j oint horizontal displacement,and that shear stress is closely related to the change of the j oint load transfer ability.
