摘要
为获取钢筋混凝土空心板梁的疲劳损伤发展规律,通过对1片试验梁的静载试验测得试验梁的极限承载力,以此作为疲劳试验加载幅值取值依据,对5片试验梁进行等幅疲劳加载试验。试验表明,试验梁呈现出明显的疲劳损伤三阶段(即快速发展、稳定和破坏)规律。接近疲劳破坏时除1至2条主裂缝继续扩展外,其余裂缝停止增长并逐渐闭合,最终在主裂缝处疲劳断裂。试验梁的挠度发展、钢筋与混凝土的应变发展增量在疲劳循环初期增长比较显著;随着疲劳荷载循环次数的增加,增长速率趋缓而进入相对稳定发展阶段;临近破坏时又发生较大幅度的增长。
To acquire the law of the fatigue damage development of reinforced concrete hollow slab beams, the ultimate load carrying capacity of a tested beam was measured through the static loading test. The carrying capacity of the beam was then taken as the basis of loading amplitudes for the fatigue tests and the equal amplitude fatigue loading tests were made for another 5 beams. In the loading tests, the beams presented the obvious law of 3 stages of fatigue damage, i.e. the stages of rapid development, stability and failure. As the fatigue failure was approached, with the exception that the 1～2 main cracks in each beam continued developing, the rest of the cracks stopped developing and gradually closed and finally the fatigue breaking of the beams took place at the main cracks. The deflection development of the tested beams and the strain increment of the reinforcement and concrete were obvious at early stage of the fatigue load cycling. With the increase of the fatigue load cycling times, the development and increment speed tended to become slow and entered the stage of relative stability and as the failure was approached, the speed became great again.
出处
《桥梁建设》
EI
CSCD
北大核心
2013年第3期42-47,共6页
Bridge Construction
基金
湖北省自然科学基金资助项目(2011CDB239)
国家西部交通建设科技项目(200631800019)
铁道部重大科研项目(2008G031-17-5)~~
