长期服役的高速公路空心梁板疲劳性能试验研究  

Experimental Study on Fatigue Performance of Expressway Hollow Beam Slab in Long-term Service

作　　者：杜岩松 韩洪涛 郝朝伟 王明法 王鹏程 DU Yan-song;HAN Hong-tao;HAO Chao-wei;WANG Ming-fa;WANG Peng-cheng(School of Civil Engineering,Shandong Jiaotong University,Jinan Shandong 250357,China;Construction Management Branch of Shandong Expressway Group Co.,Ltd.,Jinan Shandong 250001,China;Key Laboratory of Bridge Detection Reinforcement Technology of Transport Industry(Beijing),Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]山东交通学院交通土建工程学院,山东济南250357 [2]山东高速集团有限公司建设管理分公司,山东济南250001 [3]交通运输部公路科学研究院旧桥检测与加固技术交通运输行业重点实验室(北京),北京100088

出　　处：《公路交通科技》2022年第8期53-61,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50908017);中央级公益性科研院所基本科研业务费项目(2021-9060a);山东省交通运输厅科技计划项目(2018B68)。

摘　　要：为研究服役多年的高速公路预应力空心梁板抗疲劳性能,依托某高速公路改扩建工程,采用大型加载结构MTS开展了对服役多年的旧桥梁板抗疲劳性能研究,分析了梁体在循环荷载作用下的受力状况。采用ABAQUS有限元分析软件对旧桥梁板建立实体单元模型,模拟了钢筋混凝土梁板加载的全过程,并与试验数据进行了对比分析。通过对荷载幅值与疲劳寿命试验数据进行拟合分析,得出了梁板疲劳寿命计算公式。结果表明:在前期疲劳作用下,梁板应变及挠度发展较为稳定,后期随着循环次数的增加两者增幅较大;裂缝发展由梁底部向上延伸,并在破坏阶段贯穿顶部;在疲劳荷载作用下,梁体破坏模式为受压区混凝土先破坏,随后受拉区混凝土破坏,属于典型的脆性破坏模式;不同幅值下的梁板破坏时挠度及应变值上下浮动小,但是其疲劳寿命相差较大,荷载幅值的增大不会影响破坏时的挠度和应变值,只对疲劳寿命有影响;0.7M_(max)幅值与0.8M_(max),0.9M_(max),1.0M_(max)幅值分别相差1.14,1.29,1.42倍,其幅值下的疲劳耐受度比值分别为1.96,4.17,9.52倍,可以看出疲劳耐受度不是随荷载幅值的增加而呈线性降低;有限元模拟结果与实际试验数据基本吻合,数据可靠。In order to study the anti-fatigue performance of expressway prestressed hollow beam slab that has been in service for many years,relying on an expressway reconstruction and expansion project,the anti-fatigue performance of old bridge beam slab that has been in service for many years is researched by using the large-scale loading structure MTS.The stress state of the beam under cyclic load is analyzed.the solid element model of the old bridge slab is established by using ABAQUS finite element analysis software,the whole loading process on the RC beam slab is simulated,and the result is compared and analyzed with the test data.By fitting and analyzing the load amplitude and the fatigue life test data,the fatigue life calculation formula of beam slab is obtained.The result shows that(1)under the action of fatigue in the early stage,the strain and deflection of the beam slab are relatively stable,and they increase greatly with the increase of the number of cycles in the later stage;(2)the crack develops upward from the bottom of the beam and penetrates the top in the failure stage;(3)under the action of fatigue load,the failure mode of the beam is that the concrete in the compression zone fails first,followed by the failure in the tension zone,which belongs to the typical brittle failure mode;(4)the deflection and strain values of the beam slab failure under different amplitudes fluctuate slightly,but the fatigue lives varies greatly,the increase of the load amplitude does not affect the deflection and strain value at failure,but only affects the fatigue life;(5)the difference between the amplitude of 0.7M_(max) and the amplitudes of 0.8M_(max),0.9M_(max),and 1.0M_(max) is 1.14,1.29,1.42 times respectively,and the fatigue tolerance ratios under such amplitudes is 1.96,4.17 and 9.52 times respectively,it can be seen that the fatigue tolerance does not decrease linearly with the increase of the load amplitude;(6)the finite element simulation result is basically consistent with the actual test data,and the data are rel

关 键 词：桥梁工程 疲劳寿命 MTS 空心梁板 最大应变 挠度 

分 类 号：U448.33[建筑科学—桥梁与隧道工程]