大跨半钢板混凝土组合下的仰拱结构疲劳损伤试验研究  

Experimental study on fatigue damage of inverted arch structure with long span and half steel plate concrete

作　　者：常秋影[1] 赵东拂[2] 刘兰兰[1] 

机构地区：[1]长春建筑学院,吉林长春130012 [2]北京建筑大学,北京102616

出　　处：《混凝土》2017年第10期78-82,共5页Concrete

摘　　要：采用疲劳试验,对隧道基底的半钢板混凝土组合仰拱结构试件的疲劳损伤进行了研究。结果表明:在142万次疲劳结束后,试件Z-1沿截面高度钢梁腹板整个被拉裂;在115万次疲劳结束后,试件Z-2腹板全部被拉裂;Z-3试件在疲劳试验循环211万次后,无裂缝产生。试件Z-1、Z-2最小动挠度和最大动挠度随着疲劳加载次数增加有逐渐线性增加趋势,但增加速度较慢,试件Z-3组合梁在达到目标循环200万次前,疲劳破坏未发生。随着疲劳加载次数的增加,试件Z-1的跨中残余挠度先增加后减小再增加,试件Z-2为增加趋势,试件Z-3保持稳定。在临近破坏前,疲劳残余挠度对试件影响较大。试件Z-1、Z-2、Z-3在荷载分别大于100、50、150 k N时,底面钢板应变增加较快。在整个挠度中,试件组合梁最大疲劳残余挠度平均百分比为7.5%,对于隧道基底的半钢板混凝土组合仰拱等承受动荷载结构,由于重复荷载引起组合梁的挠度变形应当重视。In this paper, fatigue test is carried out to study the fatigue damage of the semi steel plate concrete composite arch structure of tunnel foundation.The results show that at the end of the 1 million 420 thousand after fatigue specimen Z-1 along the height of cross section of steel web is the crack;at the end of 1 million 150 thousand after fatigue specimens were all Z-2 web crack;Z-3 specimen in fatigue test after 2 million 110 thousand cycles,no cracks.Specimen Z-1 ,Z-2 minimum deflection and the maximum deflection fatigue loading times increased gradually with the linear increase trend,but the increase speed is slow,the specimen of Z-3 composite beam in the target 2 mil- lion cycles ago ,fatigue failure did not occur.With the increase of the number of fatigue loading,the residual deflection of the specimen Z-1 increases first and then decreases and then increases.The specimen Z-2 increases, and the specimen Z-3 remains stable.The fatigue residual deflection has great influence on the specimen before the failure.When Z-1, Z-2 and Z-3 were larger than 100,50 and 150 kN, the strain of the bottom plate increased rapidly.The deflection of composite beam specimen,the maximum fatigue residual deflection of the average percentage is 7.5% ,the tunnel base semi steel concrete composite arch structure under dynamic load,because of the repeated load caused by beam deflection should pay attention to.

关 键 词：疲劳损伤 仰拱结构 钢板混凝土 动挠度 

分 类 号：TU528.01[建筑科学—建筑技术科学]