摘要
针对预埋件吊装预制构件不能很好满足装配式混凝土路面的几何连续及可重复使用问题,设计采用一种新型通孔吊装方式,即水平外伸钢筋网架法吊装路面板。通过测试不同配筋混凝土路面板通孔吊装应变响应,验证通孔吊装方式的可行性。采用有限元软件ABAQUS和测试数据,分别建立和验证路面板三维数值模型,并分析不同尺寸的预制混凝土路面板水平通孔吊装力学行为。研究结果表明:当混凝土路面板(长、宽、高分别为3.5、3、0.22m)采用平面四点通孔吊装时,吊装方向和垂直吊装方向的配筋率分别从0.409%和0.292%降到0.221%和0.189%(极限配筋)下,自重和常规吊速使得板底、板顶分别产生约30×10^(-6)的拉、压应变。吊装全过程路面板混凝土均处于弹性变形阶段,未开裂破坏。路面板通孔吊装结构受力大小与通孔吊距及路面板尺寸呈正相关,且混凝土与钢筋在吊点处应力集中现象明显。为防止集中应力引起混凝土开裂,建议在应力集中区域对钢筋网做局部加密,并选用较粗钢筋(如钢筋直径Φ28)作为吊装主筋,以降低钢筋与混凝土咬合部位集中应力。同时,通孔吊装宜优先选择长边起吊,且吊距不宜大于4.0m。当路面板采用通孔吊装方式需要减配钢筋时,宜先减配垂直吊装方向钢筋。研究结果可为预制混凝土路面板或类似构件采用通孔平吊的结构尺寸设计、配筋布置以及吊点布设等提供参考。
Because of the problems that the traditional embedded hanger cannot be well met by the geometric continuity and reusable of the prefabricated concrete pavement,a new type of throughhole hoisting method,namely the horizontal extended steel grid method was proposed to hoist the pavement slabs.The feasibility of this method was verified by the strain response of different reinforced concrete pavement slabs.The finite element analysis program ABAQUS and the test data were used to establish and verify the three-dimensional(3D)numerical model of the slab,respectively,and the mechanical behavior of horizontal through-hole hoisting for precast concrete slabs was analyzed.The results show that when the concrete slab with the size of 3.5m(length)×3m(width)×0.22m(height)is hoisted with four-point through holes,the reinforcement ratios of hoisting direction and vertical hoisting direction decreased from 0.409%and 0.292%to 0.221%and 0.189%(ultimate reinforcement),respectively,results in about 30×10^(-6)strains generated at the bottom and top of the slab under the action of self-weight load and normal hosting speed.The pavement slab concrete during the whole hoisting process is in the elastic deformation stage without cracking.The slab's inner stress caused by the through-hole hoisting is positively correlated with the hoisting distance and the slab size,and the stress concentration of concrete and steel bars at the lifting point is significant.To prevent stress concentration-induced concrete cracking,the locally densified steel mesh in the stress concentration area and the thicker steel bar(such as diameter of rebar isΦ28)as the main reinforcement for hoisting are recommended to reduce the concentrated stress at the occlusion part of the steel bar and concrete.Meanwhile,the long side of the slab as the hoisting edge and lifting distance less than 4.0mare also preferentially encouraged.Moreover,if necessary to reduce the reinforcement of the slab when adopting the throughhole hoisting method,the rebar in the vertical hoist
作者
柯文汇
周然
方明镜
陈一鸣
王潇
KE Wen-hui;ZHOU Ran;FANG Ming-jing;CHEN Yi-ming;WANG Xiao(Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430023,Hubei,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,Hubei,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第1期30-38,共9页
Journal of Chang’an University(Natural Science Edition)
基金
湖北省住建厅科技计划项目(202023)
武汉市政工程集团科技计划项目(202105)。
关键词
道路工程
装配式路面
预制混凝土板
吊装
力学行为
数值分析
试验验证
road engineering
prefabricated pavement
precast concrete slab
hoisting
mechanical behavior
numerical analysis
test verification
