销栓型竹-混凝土组合结构的力学性能

发布时间：2018-05-20 22:40

本文选题：竹 + 混凝土　；参考：《农业工程学报》2017年03期

【摘要】：为了研究销栓型竹-混凝土组合结构的组合效应,进行了竹-混凝土剪力连接件与竹-混凝土组合梁的力学性能试验与理论分析。研究结果表明:销栓型剪力连接件承受荷载时表现出较大的滑移变形能力,属于延性破坏,对于3个具有相同参数的销栓型竹-混凝土剪力连接件,其荷载-滑移曲线变化趋势具有较好的一致性,荷载-滑移曲线表现为弹性、弹塑性、完全塑性3个阶段;竹-混凝土组合梁的破坏模式表现为竹梁底部的竹纤维断裂,在加载后期,截面的界面上、下存在应变差,表现出部分组合界面滑移的特征,组合梁相对于对比竹梁,其极限荷载提高了89%,对应跨中位移为跨度1/250时的荷载提高了274%,归因于竹材和混凝土共同工作形成了组合截面,其承载力和截面刚度大幅度提高。基于试验结果,提出了销栓型剪力连接件荷载-滑移曲线模型,能够描述荷载-滑移曲线3个阶段的明显特征,可用于该类型竹-混凝土组合梁受力全过程的精细化数值分析,考虑剪力连接件的剪切滑移刚度,建议采用等效截面刚度法预测竹-混凝土组合梁的位移。结果表明,将等效截面刚度折减0.8的系数,荷载-位移曲线计算结果与试验结果吻合较好,研究成果为新型竹-混凝土组合结构的设计与应用提供参考。
[Abstract]:In order to study the combination effect of bamboo-concrete composite structure with pin bolt, the mechanical properties of bamboo-concrete shear connectors and bamboo-concrete composite beams were tested and theoretically analyzed. The results show that the pin bolt type shear joint exhibits a large slip deformation ability and belongs to ductile failure when it is subjected to load, and for three pin bolt type bamboo concrete shear connectors with the same parameters, The load-slip curve shows three stages of elasticity, elastic-plastic and complete plasticity, and the failure mode of bamboo-concrete composite beam is the fracture of bamboo fiber at the bottom of bamboo beam. At the later stage of loading, there is a strain difference at the interface of the cross section, which shows the slippage of part of the composite interface, and the composite beam is relative to the contrasted bamboo beam. The ultimate load is increased by 89 and the load at 1 / 250 of the span is increased by 274, which is attributed to the combined section formed by the joint work of bamboo and concrete, and its bearing capacity and section stiffness are greatly improved. Based on the test results, a load-slip curve model of pin bolt shear connection is proposed, which can describe the obvious characteristics of load-slip curve in three stages, and can be used for the detailed numerical analysis of the whole force process of the bamboo-concrete composite beam. Considering the shear-slip stiffness of shear connections, it is suggested that the equivalent section stiffness method be used to predict the displacement of bamboo-concrete composite beams. The results show that the coefficient of equivalent section stiffness is reduced by 0.8 and the calculated results of load-displacement curves are in good agreement with the experimental results. The research results provide a reference for the design and application of new bamboo-concrete composite structures.
【作者单位】：南京林业大学土木工程学院;
【基金】：国家自然科学基金(51208262) 江苏省自然科学基金(BK20151520) 江苏高校优势学科建设工程资助项目(PAPD) 住房和城乡建设部科学技术项目(2011-K2-9)
【分类号】：TU398.9

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