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新型钢节点装配式混凝土梁力学性能及破坏机制研究
Research on mechanical properties and damage mechanism of new steel-node assembled concrete beams
2024年第3期
装配式混凝土梁;承载能力;有限元;混凝土裂缝
Assembled concrete beam; Load-bearing capacity; Finite element; Concrete crack
2024年第3期
10.19761/j.1000-4637.2024.03.043.07
国家自然科学基金项目(51878522)。
吴东平,杨志宇,李成玉
武汉科技大学 城市建设学院,湖北 武汉 430065

吴东平,杨志宇,李成玉

吴东平,杨志宇,李成玉.新型钢节点装配式混凝土梁力学性能及破坏机制研究[J].混凝土与水泥制品,2024(3):43-48,52.

WU D P,YANG Z Y,LI C Y.Research on mechanical properties and damage mechanism of new steel-node assembled concrete beams[J].China Concrete and Cement Products,2024(3):43-48,52.

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摘   要:由于传统装配式混凝土梁运输和施工难度大,提出了一种新型钢节点装配式混凝土梁,并试制了1根现浇梁试件与3根装配式梁试件,通过抗弯静载试验,对比研究了新型钢节点对装配式梁试件力学性能及其破坏机制的影响。根据试验情况,采用ABAQUS有限元软件进行了试件破坏模拟,并与试验结果进行了对比分析。结果表明:装配式梁试件可达到现浇梁的承载力水平;新型钢节点的钢端板厚度对装配式梁试件的整体承载力影响较大,当钢端板尺寸在一定范围内时,装配式梁试件的承载能力优于现浇梁;新型钢节点对混凝土的破坏形式影响较大,其梁纯弯段裂缝不同于现浇梁的受弯竖向裂缝,表现为弯剪斜向裂缝;有限元模拟结果与试验结果相吻合,可用于装配式梁试件的后续研究。 Abstract: Due to the high difficulty in transportation and construction of traditional prefabricated concrete beams, a new type of assembled concrete beam with steel nodes was proposed. One cast-in-place beam specimen and three assembled beam specimens were fabricated on a trial basis to investigate the practicality of such assembled beams, the effect of new type steel nodes on the mechanical performance of concrete beams, and their influence on the damage of concrete through flexural static load tests. ABAQUS finite element simulation was used to compare and analyze the test results according to the test conditions. The results show that the new type of assembled beam can reach the level of load-bearing of cast-in-place beam. The thickness of the steel end plate in the node part has a greater impact on the overall load-bearing capacity of the beam, and the load-bearing capacity of this assembled concrete beam is better than that of cast-in-place beam when the size of the steel end plate reaches a certain level. New type of steel node has a greater impact on the destruction of concrete. The pure bending section crack of the beam is different from the bending vertical crack of the cast-in-place beam, which is the bending shear diagonal crack. The finite element simulation results coincide with the test results, which can be used for subsequent research on prefabricated beam specimens.
英文名 : Research on mechanical properties and damage mechanism of new steel-node assembled concrete beams
刊期 : 2024年第3期
关键词 : 装配式混凝土梁;承载能力;有限元;混凝土裂缝
Key words : Assembled concrete beam; Load-bearing capacity; Finite element; Concrete crack
刊期 : 2024年第3期
DOI : 10.19761/j.1000-4637.2024.03.043.07
文章编号 :
基金项目 : 国家自然科学基金项目(51878522)。
作者 : 吴东平,杨志宇,李成玉
单位 : 武汉科技大学 城市建设学院,湖北 武汉 430065

吴东平,杨志宇,李成玉

吴东平,杨志宇,李成玉.新型钢节点装配式混凝土梁力学性能及破坏机制研究[J].混凝土与水泥制品,2024(3):43-48,52.

WU D P,YANG Z Y,LI C Y.Research on mechanical properties and damage mechanism of new steel-node assembled concrete beams[J].China Concrete and Cement Products,2024(3):43-48,52.

摘要
参数
结论
参考文献
引用本文

摘   要:由于传统装配式混凝土梁运输和施工难度大,提出了一种新型钢节点装配式混凝土梁,并试制了1根现浇梁试件与3根装配式梁试件,通过抗弯静载试验,对比研究了新型钢节点对装配式梁试件力学性能及其破坏机制的影响。根据试验情况,采用ABAQUS有限元软件进行了试件破坏模拟,并与试验结果进行了对比分析。结果表明:装配式梁试件可达到现浇梁的承载力水平;新型钢节点的钢端板厚度对装配式梁试件的整体承载力影响较大,当钢端板尺寸在一定范围内时,装配式梁试件的承载能力优于现浇梁;新型钢节点对混凝土的破坏形式影响较大,其梁纯弯段裂缝不同于现浇梁的受弯竖向裂缝,表现为弯剪斜向裂缝;有限元模拟结果与试验结果相吻合,可用于装配式梁试件的后续研究。

Abstract: Due to the high difficulty in transportation and construction of traditional prefabricated concrete beams, a new type of assembled concrete beam with steel nodes was proposed. One cast-in-place beam specimen and three assembled beam specimens were fabricated on a trial basis to investigate the practicality of such assembled beams, the effect of new type steel nodes on the mechanical performance of concrete beams, and their influence on the damage of concrete through flexural static load tests. ABAQUS finite element simulation was used to compare and analyze the test results according to the test conditions. The results show that the new type of assembled beam can reach the level of load-bearing of cast-in-place beam. The thickness of the steel end plate in the node part has a greater impact on the overall load-bearing capacity of the beam, and the load-bearing capacity of this assembled concrete beam is better than that of cast-in-place beam when the size of the steel end plate reaches a certain level. New type of steel node has a greater impact on the destruction of concrete. The pure bending section crack of the beam is different from the bending vertical crack of the cast-in-place beam, which is the bending shear diagonal crack. The finite element simulation results coincide with the test results, which can be used for subsequent research on prefabricated beam specimens.

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(1)有限元模拟与试验得到的试件荷载-位移曲线误差在5%以内,有限元模拟结果与试验过程现象相匹配,能较好地反映其力学性能,验证了有限元模型的有效性与正确性。
(2)节点的钢端板厚度对节点的整体刚度影响较大,当钢端板厚度较小时,节点会出现较大的变形,导致跨中节点连接处转角增大;节点的钢端板厚度对装配式构件的屈服荷载、屈服位移与峰值荷载同样具有一定影响。
(3)新型装配式梁的承载能力能达到现浇混凝土梁水平。当节点部分钢端板厚度满足要求时,新型装配式梁的承载能力强于现浇梁,其延性也优于现浇梁。
(4)节点对混凝土的破坏具有明显影响,新型装配式梁的破坏形态与现浇混凝土梁存在差别。加载点与支座之间的弯剪段混凝土破坏与现浇混凝土梁无异,表现为弯剪斜裂缝特征。加载点之间的纯弯段,现浇混凝土梁呈受弯竖向裂缝特征,新型装配式梁呈弯剪斜裂缝特征。
(5)新型装配式梁的节点为干式连接形式,其现实施工操作易于现有的湿式连接形式,承载能力能达到现浇梁水平,易于在施工条件限制下操作,具有较强的现实实用性。

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吴东平,杨志宇,李成玉.新型钢节点装配式混凝土梁力学性能及破坏机制研究[J].混凝土与水泥制品,2024(3):43-48,52.

WU D P,YANG Z Y,LI C Y.Research on mechanical properties and damage mechanism of new steel-node assembled concrete beams[J].China Concrete and Cement Products,2024(3):43-48,52.

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