摘要
为研究混凝土空心板梁桥铰缝在疲劳荷载作用下的损伤规律,设计了三梁两铰缝结构体系的疲劳试验。对板梁挠度、裂缝开展、铰缝两侧的挠度差以及横向开合等进行了分析,提出了可以评价铰缝损伤状态的损伤系数,并在实际桥梁上进行了应用与分析。研究结果表明:在疲劳荷载作用下,铰缝性能劣化以及梁体的刚度退化趋势均具有“快-慢-快”的特点。在约15%的寿命周期中,铰缝开始全线渗水,但铰缝横向传力能力仍较强;在此以后约75%的寿命周期中,铰缝损伤发展较缓慢;在最后约10%的寿命周期里,铰缝传力能力快速下降,梁体损伤迅速,铰缝接近失效。通过对实际桥梁进行试验验证,证明所提损伤系数评价铰缝所处的损伤状态是可行且有效的。
To study the damage of hinge joints on concrete hollow slab bridges under fatigue load,the fatigue test of three slabs and two hinges structure system was designed.The deflections of slabs,the crack developments,the vertical deflection difference and the opening at both sides of the hinge joint were analyzed.A coefficient that can evaluate the damage level of the hinge joint was proposed and applied to some practical bridges.The results show that the deterioration rates of hinge joint performance and the slab stiffness are characterized by“fast-slow-fast”under the fatigue load.At about 15%of the fatigue life,the hinge joints begin to seepage,while the transverse force transmission capacity is still very strong.After this,about 75%of the fatigue life proportion,the damage of the hinge joints develops slowly.In the last 10%fatigue life,the force transmission capacity of the hinge joints decreases rapidly,the slab damages rapidly,and the hinge joints approach failure.Through the experimental verification of the actual bridge,the proposed damage coefficient is feasible and effective to evaluate the damage state of the hinge joint.
作者
康爱红
顾倩俪
唐站站
沈楸
KANG Aihong;GU Qianli;TANG Zhanzhan;SHEN Qiu(College of Civil Science&Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Research Center of Basalt Fiber Composite Construction Materials,Yangzhou,225127,China)
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2023年第2期65-72,共8页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(51708485)
江苏省研究生科研与实践创新计划项目(KYCX21_3222)。
关键词
桥梁工程
空心板梁桥
疲劳试验
铰缝
损伤规律
bridge engineering
hollow slab bridge
fatigue test
hinge joint
damage law
