摘要
模拟秦沈线连续结合梁的受力状态 ,制作了 6根模拟试验结合梁 ,其中配筋率 2 %和 3 %各 3根 ,采用单伸臂跨内、跨外两点同步加载模式对每根梁做了 2 0 0万次疲劳试验 ,分析研究了钢与混凝土之间的滑移 ,栓钉的受力状态 ,无钉区两侧密集型群钉中力的分配 ,梁的刚度变化和应力状态 ,负弯矩区混凝土中裂纹的发展等问题。研究结果表明 ,高配筋混凝土连续结合梁抗疲劳性能优良 ,2 0 0万次疲劳试验后 ,无钉区钢与混凝土之间的滑移明显比其他梁段大 ,但最大不超过 0 0 75mm ,两侧头排栓钉的受力是栓钉平均受力的 1 54倍 ;负弯矩区混凝土板中的最大裂纹宽度不大于 0 1 3mm ;梁的刚度没有明显的下降 。
The test simulates the force condition of th e continuous composite beams installed on Qin—Shen Dedicated Passenger Railway an d manufactures 6 composite beams for the test. Three of the beams have a wiring ratio of 3% and the other three 2%. Every beam undergoes 2 million cycles of fat igue test. They are simply supported and loaded synchronously at two points out of the span. The paper analyzes the slip displacement between the concrete and t he steel and the stresses on studs, the stress distribution in area where the st uds are heavily arranged on both sides of the stud free region, the intensity an d stress condition of the beams, and the development of cracks in the concrete a t the hogging moment area. The research results show that the continuous composi te beam that has a high wiring rate has good anti-fatigue performance. After tw o million cycles of fatigue test the slip between the concrete and the steel in the no stud area is apparently greater than other sections of the beam, being no greater than 0 075 mm. The shear force of the first row of studs at the two si des is 1 54 times the average. The maximum width of the crack of the slab in th e hogging moment area is greater than 0 13 mm. The stiffness of the composite b eam has no obvious indication of deteriorating. The deflection and the strain of the beam are all close to the theoretical value in the 1st state.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2002年第5期95-100,共6页
China Railway Science
基金
铁道部科技开发重点项目 ( 2 0 0 0G0 0 6 )
关键词
秦沈客运专线
连续结合梁
疲劳试验
铁路桥
Qinshen railway
Steel-concrete composite b eam
Stud-free area
Continuous beam
