摘要
开孔梁可以有效降低结构层高和自重,但孔洞的存在对梁的受力性能造成了一定影响。文章基于塑性损伤有限元模型,分析了不同形状、孔径、水平和竖向位置等开孔参数对活性粉末混凝土(Reactive Powder Concrete,RPC)开孔梁的极限承载力、变形及延性的影响。结果表明:开孔面积相同时,不同开孔形式的RPC开孔梁之间的受力性能差异不大;开孔梁的极限承载力及延性随着孔径的增加而减小,而变形随着孔径的增加而增大;洞口位于弯剪段,开孔梁极限承载力及延性较纯弯段内的开孔梁有大幅降低;孔洞偏向混凝土受压区对开孔梁极限承载力、变形以及延性的影响十分明显。根据开孔梁受力性能,对RPC梁孔洞的设置提出了相应的设计建议。
The opening beam can effectively reduce the structural height and self-weight,but the existence of holes has a certain impact on the mechanical performance of the beam.Based on the plastic damage finite element model,this article analyzes the effects of different opening parameters such as shape,aperture,horizontal and vertical positions on the ultimate bearing capacity,deformation and ductility of reactive powder concrete(RPC)opening beams.The results show that when the opening area is the same,there is not much difference in the mechanical performance between RPC opening beams with different opening shapes.The ultimate bearing capacity and ductility of the opening beam decrease with the increase of the aperture,while the deformation increases with the increase of the aperture.When the hole is located in the bending-shear zone,the ultimate bearing capacity and ductility of the opening beam are significantly reduced compared to opening beams within the pure bending zone.The influence of holes biased towards the compressed zone of concrete on the ultimate bearing capacity,deformation,and ductility of the open-hole beam is very significant.Based on the mechanical performance of opening beams,corresponding design suggestions for the arrangement of holes in RPC beams are proposed.
作者
张爱社
曹照法
ZHANG Aishe;CAO Zhaofa(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)
出处
《山东建筑大学学报》
2023年第6期1-9,共9页
Journal of Shandong Jianzhu University
关键词
活性粉末混凝土
开孔梁
孔洞参数
受力性能
数值模拟
reactive powder concrete
opening beam
opening parameters
mechanical performance
numerical simulation
