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RESEARTH ON MECHANICAL PROPERTIES OF STEEL-BAMBOO COMPOSITE I-BEAMS AFTER BEING SUBJECTED TO LONG-TERM LOADING
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摘要: 为了探究长期荷载作用后钢-竹组合工字形梁的力学性能，以竹板厚度、钢板厚度和宽度、截面高度为参数，设计制作了8根钢-竹组合工字形梁试件，其中4根为长期加载试件，施加长期荷载后进行二次加载破坏试验，其余4根为短期试件，直接进行加载破坏试验，来作为对比。对长期加载试件和短期试件进行分析，对比破坏特征、破坏形态、破坏荷载，研究钢-竹组合工字形梁的荷载-应变关系、荷载-挠度关系、承载力衰减等力学性能的变化，探讨钢-竹组合工字形梁在长期荷载作用后承载力与挠度的计算方法。试验结果表明：钢-竹组合工字形梁在长期荷载作用后，仍具有良好的受力特性。长期荷载作用对钢-竹组合工字形梁的最终破坏形态无影响，组合梁二次加载破坏与直接加载破坏受力过程均呈弹性、屈服、开裂、极限四个阶段；长期试件的挠曲变形与短期试件的挠曲变形相差不大，增加竹板厚度、钢板厚度和宽度、截面高度，可提高长期加载试件的极限荷载，长期试件承载力的衰减程度约为10%；采用所提出的算式计算钢-竹组合工字形梁长期荷载作用后的承载力与挠度，理论值与试验值吻合较好。Abstract: In order to explore the mechanical properties of steel-bamboo composite I-beam after being subjected to long-term loading, eight steel-bamboo composite I-beam specimens were designed and fabricated with the parameters of bamboo plate thickness, steel plate thickness and width, and section height. Four of them were long-term loaded specimens. After being subjected to long-term loading, secondary loading failure tests were carried out. The other four were short-term loaded specimens, and loading failure tests were carried out directly for comparison. The long-term and short-term loaded specimens were analyzed, and the failure characteristics, failure modes and failure loads were compared. The load-strain relationship, load-deflection relationship and bearing capacity attenuation of steel-bamboo composite I-beams were studied. The calculation method of bearing capacity and deflection of steel-bamboo composite I-beams after being subjected to long-term loading was discussed. The test results showed that the steel-bamboo composite I-beams still had good mechanical properties after being subjected to long-term loading. Long-term load had no effect on the ultimate failure mode of steel-bamboo composite I-beams. The secondary loading failure and direct loading failure of composite beams had four stages of elasticity, yield, cracking and ultimate strength. The flexural deformation of long-term loaded specimens was little different from that of short-term loaded specimens. Increasing the thickness, width and section height of bamboo plate could improve the ultimate bearing capacity of long-term loaded specimens. The bearing capacity of long-term loaded specimens decreased by about 10%. This paper calculated the bearing capacity and deflection of steel-bamboo composite I-beams after being subjected to long-term loading by using the proposed formula, and the theoretical value was in good agreement with the experimental value.
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田黎敏,靳贝贝,郝际平. 现代竹结构的研究与工程应用[J]. 工程力学,2019,36(5):1-18,27. 李玉顺,沈煌莹,单炜,等. 钢-竹组合工字梁受剪性能试验研究[J]. 建筑结构学报,2011,32(7):80-86. 沈煌莹,李玉顺,张王丽,等. 冷弯薄壁型钢-竹胶板组合梁受弯性能试验研究[J]. 建筑结构学报,2009,31(增刊2):171-175. LI Y S, SHAN W, SHEN H Y, et al. Bending Resistance of I-Section Bamboo-Steel Composite Beams Utilizing Adhesive Bonding[J]. Thin-Walled Structures, 2015, 89:17-24. 茅鸣,张家亮,童科挺,等.基于不同种类竹板的钢-竹组合梁受弯性能对比分析[J]. 建筑结构,2020,56(16):107-113. 李玉顺,张秀华,吴培增,等. 重组竹在长期荷载作用下蠕变行为[J]. 建筑材料学报,2019,22(1):65-71. MASSIMO F, ARIO C. Long-Term Behavior of Timber-Concrete Composite Beams. I:Finite Element Modeling and Validation[J]. Journal of Structural Engineering, 2006,132(1):13-22. BRANDT C W, FRIDLEY K J. Load-Duration Behavior of Wood-Plastic Composites[J]. Journal of Material in Civil Engineering, 2003, 15(6):524-536. GIRHAMMAR U A, PAN Dan H, GUSTAFSSON A. Exact Dynamic of Composite Beams with Partial Interation[J]. International Journal of Mechanical Science, 2009, 51(8):565-582. 聂建国,沈聚敏. 钢筋混凝土梁在长期荷载作用下的变形[J]. 建筑结构学报,1994(1):21-22. 李玉顺,张家亮,童科挺,等. 钢-竹组合工字型截面截面滑移及分析变形[J]. 工程力学, 2018, 35(7):150-158. 解其铁. 静荷载作用下钢-竹界面粘结性能研究[D]. 宁波:宁波大学, 2012. 沈煌莹, 李玉顺, 张振文,等. 竹材人造板在建筑结构中的深化利用研究——以工字形钢-竹组合为例[C]//徐世烺. 第八届全国土木工程研究生学术论坛论文集. 杭州:2010:1015-1021. 张秀华, 鄂婧, 李玉顺, 等. 重组竹抗压和抗弯力学性能试验研究[J]. 工业建筑,2016,46(1):7-12. -
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