（宁波大学土木与环境工程学院， 宁波 315211）

［摘要］冷弯薄壁型钢分别与重组竹、竹胶板通过结构粘结剂复合成工字形组合梁，以竹板厚度、梁截面高度、薄壁型钢壁厚及翼缘宽度为参数，对冷弯薄壁型钢-重组竹组合梁、冷弯薄壁型钢-竹胶板组合梁这两种试件进行弯曲性能试验，围绕组合梁破坏形态、整体性能差异、承载力能力及其影响因素、短期集中荷载作用下变形情况进行比较。结果表明，两种钢-竹组合梁试件整体工作性能均表现良好，组合效应突出，具有较高的承载力及良好的延性；冷弯薄壁型钢-重组竹组合梁破坏形态比较单一，与此相比冷弯薄壁型钢-竹胶板组合梁破坏形态则较为多样；组合梁抗弯承载力与材料力学性能密切相关，同时随着竹板厚度、梁截面高度、薄壁型钢壁厚及翼缘宽度的增加，承载能力有效提高，且在同等情况下冷弯薄壁型钢-竹胶板组合梁提高的幅度明显大于冷弯薄壁型钢-重组竹组合梁；两种组合梁按编号对应相比较，试验参数基本相同的条件下，冷弯薄壁型钢-重组竹组合梁的正常使用极限状态和承载能力极限状态下的承载力均高于冷弯薄壁型钢-竹胶板组合梁，平均提高约35%。

［关键词］冷弯薄壁型钢；  重组竹； 竹胶板； 组合梁； 受弯性能

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2020)16-0107-07

Comparative analysis of flexural behavior of steel-bamboo composite beams based on different kinds of bamboo plates

MAO Ming, ZHANG Jialiang, TONG Keting, LI Yushun

(School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China)

Abstract:Cold-formed thin-walled steel had combined with recombined bamboo or bamboo plywood into I-section composite beams. Thickness of bamboo, the height of beam, the thickness of steel and the width of flange were set as the main parameters. Flexural performance tests were experimented between cold-formed thin-walled steel-recombined bamboo composite beam specimens and cold-formed thin-walled steel-bamboo plywood composite beam specimens, which was compared around with failure modes for composite beams, overall performance differences, bearing capacity and its influencing factors, deformation under short-term concentrated load of composite beams. The experimental results indicate that both types of steel-bamboo composite beams have good overall performance, combination effect highlights, high bearing capacity and good ductility. Cold-formed thin-walled steel-recombined bamboo composite beams have a single failure mode, while cold-formed thin-walled steel-bamboo plywood composite beams have different damage patterns. Composite beams bending capacity closely related to material mechanics properties. With the increase of the thickness of bamboo, the height of beam, the thickness of steel and the width of flange, bearing capacity is effectively improved. And under the same conditions, the increase of cold-formed thin-walled steel-bamboo plywood composite beams is significantly larger than cold-formed thin-walled steel-recombined bamboo composite beams. Comparing two kinds of composite beams by number, with all test parameters basically the same, the bearing capacity under normal conditions and ultimate bearing capacity of the cold-formed thin-walled steel-recombined bamboo composite beams are all higher than those of cold-formed thin-walled steel-bamboo plywood composite beams, with an average increase of about 35%.

Keywords:cold-formed thin-walled steel;  recombined bamboo; bamboo plywood; composite beam; flexural behavior

*国家自然科学基金项目（51678310，51978345）。

作者简介：茅鸣，硕士，工程师，Email:maoming0130@163.com;通讯作者：李玉顺，博士，教授，Email:lys0451@163.com。