内置铆接开孔冷弯薄壁型钢混凝土组合梁受弯性能研究
Research on Flexural Performance of Cold-Formed Thin- Walled Steel-Concrete Composite Beams with Built-in Riveted Openings
基于锁铆连接传力可靠、强度优异的特征,提出了一种新型的内置铆接开孔冷弯薄壁型钢混凝土组合梁。以底部铆钉间距、截面宽度为变量,对内置铆接开孔冷弯薄壁型钢混凝土组合梁开展了四点弯曲试验,考察了该组合梁的破坏特征、承载性能和延性指标,试验结果表明:新型组合梁受弯时表现出良好的延性性能;底部铆钉间距小的组合梁延性较差;增大截面宽度可提高组合梁的极限承载力。采用ABAQUS有限元软件对该组合梁进行参数分析,重点探究五大关键参数对其力学性能的影响:有无混凝土包裹、混凝土强度、顶部铆钉间距、底部钢板厚度及截面高度,结果表明:在C型钢腹板处包裹混凝土可有效提高试件的刚度和承载力;随着混凝土强度、底部钢板厚度、截面高度的增加以及顶部铆钉间距的减小,组合梁的受弯承载力随之增大。采用全截面塑性准则对组合梁的极限承载力进行计算,计算值与试验结果的误差在10%以内,表明全截面塑性准则可以较为准确地反映内置铆接开孔冷弯薄壁型钢混凝土组合梁的极限承载力。
Based on the advantages of reliable force transfer and high strength of lock riveted joint, a new type of cold-formed thin-walled steel-concrete composite beam with built-in riveted openings is proposed. A four-point bending test was carried out to investigate the failure characteristics, bearing capacity and ductility of the thin-walled steel-concrete composite beams with built-in riveted openings, taking the distance of rivet at the bottom and the width of section as variables. The test results show that the new composite beams exhibit good ductility properties under bending. The ductility of composite beams with small rivet spacing at the bottom is slightly poor. The ultimate bearing capacity of composite beams can be improved by increasing the section width. ABAQUS finite element software was used to analyze the effects of concrete encasement, concrete strength, rivet distance at the top, thickness of steel plate at the bottom, and section height on the performance of the composite beams. The results show that the stiffness and bearing capacity of the specimens can be effectively improved by pouring concrete around the C-shaped steel web. With the increase of the concrete strength, the thickness of the bottom steel plate, the height of the section and the decrease of the rivet distance at the top, the flexural capacity of the composite beam increases. The error between the calculated value and the test results is less than 10%, which indicates that the full section plastic criterion can accurately reflect the ultimate bearing capacity of the composite steel and concrete beams with built-in riveted openings.
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镇江市重点研发计划-产业前瞻与共性关键技术项目(GY2023028)
江苏省研究生科研与实践创新计划项目(SJCX24_2561)
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