单调与反复竖向荷载作用下无黏结预应力型钢混凝土框架受力性能试验研究

发布时间：2018-07-02 07:48

本文选题：预应力型钢混凝土框架 + 无黏结　；参考：《建筑结构学报》2017年12期

【摘要】：对两榀无黏结预应力型钢混凝土(PSRC)框架进行了试验研究,分别施加单调与反复竖向荷载,分析并比较不同竖向荷载形式下无黏结PSRC框架的受力特征及其差异,以研究反复荷载作用对其受力性能的影响。试验结果表明:无黏结PSRC框架开裂后刚度不发生明显变化,具有优良的承载力及延性,单调荷载作用下框架的计算延性指标约为3.36;反复荷载作用下,其滞回曲线较为丰满,呈现一定的"捏拢"效应,最大能量耗散系数为1.36;达到极限荷载前,两框架的刚度、所受荷载值及正向作用下的裂缝开展情况基本接近,力加载阶段框架梁上最大裂缝宽度分别为0.11mm和0.08mm,反复荷载对结构性能的退化作用不明显;极限荷载作用后,单调荷载下框架所受荷载下降平缓,而反复荷载作用下框架所受荷载快速下降,且随着变形增大,速度变快。基于OpenSEES程序对竖向反复荷载作用下的无黏结PSRC框架的受力性能进行了模拟,其荷载-位移计算曲线与试验结果吻合良好。
[Abstract]:In this paper, two unbonded prestressed steel reinforced concrete (PSRC) frames are tested and studied. They are subjected to monotone and repeated vertical loads respectively. The stress characteristics and differences of non-bonded prestressed steel reinforced concrete (PSRC) frames under different vertical loads are analyzed and compared. In order to study the effect of repeated load on its mechanical performance. The experimental results show that the stiffness of the unbonded PSRC frame does not change obviously after cracking, and it has good bearing capacity and ductility. The calculated ductility index of the frame under monotone load is about 3.36, and the hysteretic curve of the frame under repeated loading is full. The maximum energy dissipation coefficient is 1.36. Before reaching the ultimate load, the stiffness of the two frames, the load value and the crack development under the positive action are basically close. The maximum crack width of frame beam is 0.11mm and 0.08mm respectively in the stage of force loading, and the effect of repeated load on the structural performance is not obvious, but after the ultimate load, the load of frame subjected to monotone load decreases slightly. Under repeated load, the load of frame decreases rapidly, and the speed increases with the increase of deformation. The mechanical behavior of unbonded PSRC frame subjected to vertical repeated loads is simulated based on OpenSEES program. The load-displacement calculation curve is in good agreement with the experimental results.
【作者单位】：同济大学建筑工程系;同济大学先进土木工程材料教育部重点实验室;
【基金】：国家自然科学基金项目(51178328,51578400)
【分类号】：TU398.9

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