预应力道面混凝土的弯拉与疲劳特性
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摘要
为解决机场道面达到设计寿命前发生疲劳破坏的问题,提出将预应力混凝土技术应用于机场道面工程。采用后张法对机场道面混凝土小梁施加预应力,设计三分点弯曲加载方案对96根混凝土小梁进行弯曲、抗折和疲劳试验。结果表明:施加预应力后,竖向荷载作用下小梁的挠度减小了2. 99%～5. 56%,拉应力数值及拉应力区显著减小;抗折强度提高了11. 26%～59. 42%,裂缝数量和宽度都明显减小;平均疲劳寿命增大了3. 18～5. 99倍,且随预应力的增大而增大,预应力混凝土弯曲疲劳寿命服从双参数Weibull分布,相关系数达到0. 95以上。基于Weibull分布建立了反映应力水平S和疲劳寿命N关系的双对数疲劳方程。
In order to solve the problem of fatigue failure of airport pavement before the design life was reached,the application of prestressed concrete technology in airport pavement engineering was presented in this work. The post tensioning method was applied to the concrete beams,the bending test and fatigue test were carried out on 96 concrete beams through the method of three-point bending load. Results show that when the prestress is applied,the deflection of beams under vertical load is reduced by 2. 99 %-5. 56 %,the tensile stress and the tensile stress zone are significantly decreased; the bending strength is increased by 11. 26%-59. 42%,the number and width of cracks are obviously decreased; the average fatigue life is increased by 3. 18-5. 99 times,and it increases with the increase of the prestress. The bending fatigue life of prestressed concrete obeys the double parameters Weibull distribution,and the correlation coefficient is above 0. 95. Based on the Weibull distribution,a double logarithmic fatigue equation is established which reflects the relationship between the stress level( S) and the fatigue life( N).
In order to solve the problem of fatigue failure of airport pavement before the design life was reached,the application of prestressed concrete technology in airport pavement engineering was presented in this work. The post tensioning method was applied to the concrete beams,the bending test and fatigue test were carried out on 96 concrete beams through the method of three-point bending load. Results show that when the prestress is applied,the deflection of beams under vertical load is reduced by 2. 99 %-5. 56 %,the tensile stress and the tensile stress zone are significantly decreased; the bending strength is increased by 11. 26%-59. 42%,the number and width of cracks are obviously decreased; the average fatigue life is increased by 3. 18-5. 99 times,and it increases with the increase of the prestress. The bending fatigue life of prestressed concrete obeys the double parameters Weibull distribution,and the correlation coefficient is above 0. 95. Based on the Weibull distribution,a double logarithmic fatigue equation is established which reflects the relationship between the stress level( S) and the fatigue life( N).
引文
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[14] Priddy L P. Evaluation of precast portland cement concrete panels for airfield pavement repairs[R]. Engineer Research and Development Center Vicksburg MS Geotechnical and Structures Lab,2015.
[15] Yan X C,Weng X Z,Kou Y N. Influence of fiber grid on interlayer bond property of airport double-layer pavement[J]. Journal of Reinforced Plastic and Composites,2014,33(1):34-44.
[16] Yang B H,Weng X Z. The influence on the durability of semi-flexible airport pavement materials to cyclic wheel load test[J]. Construction and Building Materials,2015,98:171-175.
[17] GJB 1278A-2009.军用机场水泥混凝土道面设计规范[S].北京:中国人民解放军总后勤部,2009.
[18]杨博瀚.机场装配式预应力水泥混凝土道面结构参数研究[D].西安:空军工程大学,2016.
[2]翁兴中,崔树业.机场道面荷载特性与结构分析方法[M].西安:陕西科学技术出版社,2014.
[3]杨博瀚,翁兴中,付婕,等.装配式机场预应力混凝土道面承载性能的影响因素分析[J].材料导报,2015,29(11):119-123.
[4]赵方冉,邓书斐,王宁.预应力道面在机场工程中的优势与应用前景[J].交通科技与经济,2013,15(4):20-23.
[5] Tayabji S,Ye D,Buch N. Design considerations for jointed precast concrete pavement systems[C]. Transportation Research Board Meeting,2012.
[6] Zhang J S,Wang Y Z,Yao Y,et al. Influence of reinforcement on in-plane mechanical behaviors of CSPRP under cyclic reversed load[J].Materials and Structures,2016,49(1-2):101-116.
[7]郭超,张敏江,路征然,等.重载交通下斜向预应力混凝土路面应用研究[J].大连理工大学学报,2015,55(3):286-291.
[8]李娜.斜向预应力混凝土路面研究[D].西安:长安大学,2011.
[9] Ashtiani R,Jackson C,Saeed A,et al. Precast concrete panels for contingency rigid airfield pavement repairs[R]. AFRL Technical Report AFRLRX-TY-TR-2010-0095,U. S. Air Force Research Laboratory,Tyndall AFB FL,2010.
[10] Tayabji S,Ye D,N Buch. Precast concrete pavement technology[R]. The Strategic Highway Research Program 2 Transportation Research Board of The National Academies National Academy of Sciences,2012.
[11] Priddy L P,Bly P G,Jackson C J,et al. Full-Scale field testing of precast portland cement(PCC)panel airfield pavement repairs[J]. International Journal of Pavement Engineering,2014,15(9):840-853.
[12] Priddy L P,Doyle J D,Flintsch G W,et al. Three-dimensional finite element modeling of precast concrete panel joints[J]. Magazine of Concrete Research,2015,67(10):513-522.
[13] Oldis C,Swan D J,Saeed A,et al. Precast slab literature review report:repair of rigid airfield pavements using precast concrete panels-A state of the art review[R]. AFRL Technical Report AFRL-RX-TY-TR-2009-4588,U. S. Air Force Research Laboratory,Tyndall AFB FL,2009.
[14] Priddy L P. Evaluation of precast portland cement concrete panels for airfield pavement repairs[R]. Engineer Research and Development Center Vicksburg MS Geotechnical and Structures Lab,2015.
[15] Yan X C,Weng X Z,Kou Y N. Influence of fiber grid on interlayer bond property of airport double-layer pavement[J]. Journal of Reinforced Plastic and Composites,2014,33(1):34-44.
[16] Yang B H,Weng X Z. The influence on the durability of semi-flexible airport pavement materials to cyclic wheel load test[J]. Construction and Building Materials,2015,98:171-175.
[17] GJB 1278A-2009.军用机场水泥混凝土道面设计规范[S].北京:中国人民解放军总后勤部,2009.
[18]杨博瀚.机场装配式预应力水泥混凝土道面结构参数研究[D].西安:空军工程大学,2016.