| 机械套筒连接预制混凝土结构抗连续倒塌机理 |
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| 引用本文： | 谭光伟,胡淑军,黄 华,覃幼辙,钱 凯.机械套筒连接预制混凝土结构抗连续倒塌机理[J].建筑科学与工程学报,2022,0(5):32-40. |
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| 作者姓名： | 谭光伟 胡淑军 黄 华 覃幼辙 钱 凯 |
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| 作者单位： | (1. 江西中煤建设集团有限公司,江西 南昌 330001; 2. 南昌大学 工程建设学院,江西 南昌 330031; 3. 长安大学 建筑工程学院,陕西 西安 710061; 4. 广西建工轨道装配式建筑产业有限公司,广西 柳州 545000; 5. 桂林理工大学 广西建筑新能源与节能重点实验室,广西 桂林 541004) |
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| 摘 要： | 为研究机械套筒连接预制混凝土(PC)结构的抗连续倒塌性能,对2个1/2缩尺PC子结构开展了试验研究,获得了PC子结构的破坏模式、竖向抗力-位移曲线、水平反力-位移曲线和梁挠度曲线。通过有限元软件LS-DYNA建立了精细化有限元模型,并开展了数值分析。结果表明:子结构破坏主要集中在梁端,其中靠近中柱的梁端破坏相较于靠近边柱的梁端破坏更为严重; 梁-柱节点区域未发生明显破坏,试件的最终失效由中柱两侧梁端纵筋断裂控制,采用机械套筒连接可以保证梁底部钢筋的连续性; 压拱阶段和悬索阶段子结构主要通过梁截面剪力和轴拉力传递荷载; 增大钢筋直径可以显著提高子结构的第一峰值承载力和极限承载力; 混凝土抗压强度对于机械套筒连接PC子结构的承载力影响不大,但提高混凝土强度会提高混凝土与钢筋间的黏结力,导致梁纵筋更早发生断裂。
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| 关 键 词： | 预制混凝土 机械套筒 连续倒塌 试验研究 有限元分析 |
Progressive Collapse Mechanism of Precast Concrete Structures Assembled with Mechanical Couplers |
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| TAN Guang-wei,HU Shu-jun,HUANG Hua,QIN You-zhe,QIAN Kai.Progressive Collapse Mechanism of Precast Concrete Structures Assembled with Mechanical Couplers[J].Journal of Architecture and Civil Engineering,2022,0(5):32-40. |
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| Authors: | TAN Guang-wei HU Shu-jun HUANG Hua QIN You-zhe QIAN Kai |
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| Affiliation: | (1. Zhongmei Engineering Group Ltd., Nanchang 330001, Jiangxi, China; 2. School of Infrastructure Engineering, Nanchang University, Nanchang 330031, Jiangxi, China; 3. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 4. Guangxi Construction Engineering Track Assembly Construction Industry Co., Ltd, Liuzhou 545000, Guangxi, China; 5. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin 541004, Guangxi, China) |
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| Abstract: | In order to study the progressive collapse resistance of precast concrete(PC)structures assembled with mechanical couplers, two 1/2 scaled PC substructures were tested. The failure modes, vertical resistance-displacement curves, horizontal reaction-displacement curves and beam deflection curves of PC substructures were obtained. A refined finite element model was established by finite element software LS-DYNA, and numerical analysis was carried out. The results show that the substructure damage is mainly concentrated in the beam end, and the beam end damage near the middle column is more serious than that near the side column. There is no obvious damage in the beam-column joint area. The final failure of the specimen is controlled by the fracture of the longitudinal reinforcement at the beam ends on both sides of the middle column. The mechanical couplers can ensure the continuity of the reinforcement at the bottom of the beam. The substructure mainly transmits the load through the shear force and axial tension of the beam section in the arch stage and the suspension stage. Increasing the diameter of reinforcement can significantly improve the first peak bearing capacity and ultimate bearing capacity of substructure. The compressive strength of concrete has little effect on the bearing capacity of PC substructure assembled with mechanical couplers, but increasing the strength of concrete will increase the bonding stress between concrete and reinforcement, resulting in earlier fracture of the longitudinal reinforcement. |
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| Keywords: | precast concrete mechanical coupler progressive collapse experimental study finite element analysis |
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