空心胶合木柱轴心受压性能研究

Study on axial compression performance of hollow glulam columns

【目的】节能环保理念越来越受关注,木材作为绿色环保的可再生建筑材料可应用在工程中,目前国内木建筑中应用的木柱主要局限于原木圆柱,为了提高木材利用率,同时降低成本,改善受力性能,满足工程需要,提出一种新型的空心胶合木柱,并进行试验研究分析。【方法】使用相同尺寸拱形锯材作为骨架,利用环氧树脂胶粘剂进行胶合,制作3根空心胶合木柱试件进行轴心加载受压试验,研究空心胶合木柱的轴压力学性能,在试验过程中通过仪器记录应变、应力和位移等数据,主要分析木柱的竖向与横向应变、竖向与侧向位移、稳定承载力等特性,并利用ABAQUS有限元软件进行建模对比分析,探讨木柱最终破坏特征。【结果】空心胶合木柱破坏形态主要是整体压屈破坏,达到极限荷载80%左右时,承载能力快速下降,侧向位移随荷载增加而迅速增大,加载过程中存在多个增长台阶;与同截面积原木圆柱比较,理论承载力提高了4.3%,计算得承载能力稳定系数为0.9,材料缺陷对轴心承载力有影响;通过有限元建模分析,材料在弹性阶段理论值与试验值吻合程度较好。【结论】空心胶合木柱应用在实际工程中是可行的,能够满足工程使用需求,充分利用小型锯材,提高了木材利用率,降低了成本,相较于原木圆柱受力性能更好。

【Objective】The concept of energy conservation and environmental protection has attracted more and more attention.Wood is a green and renewable building material that can be applied in engineering.At present,The wooden columns used in domestic wood construction are mainly limited to wood cylinders.In order to improve wood utilization,while reducing the cost,improving the performance of the force and meeting the engineering needs.To proposes a new type of hollow glulam wood column,and conducts experimental research and analysis.【Method】The same size arched sawn timber was used as the skeleton,and the epoxy resin adhesive was used for gluing.Three hollow-glued wood column specimens were prepared for axial load compression test,and the axial compression performance of hollow glued wood column was studied.During the test,The strain,stress and displacement data were recorded by the instrument.The vertical and lateral strain,vertical and lateral displacement,and stable bearing capacity of the wooden column were analyzed.The ABAQUS finite element software was used to compare and analyze the model.Explore the ultimate failure characteristics of wood columns.【Result】The failure mode of hollow glulam wood column is mainly the overall buckling failure.When the ultimate load is about 80%,the bearing capacity decreases rapidly,and the lateral displacement increases rapidly with the increase of load.There are multiple growth steps in the loading process;Compared with the log cylinder with the cross-sectional area,the theoretical bearing capacity is increased by 4.3%,and the calculated bearing capacity stability coefficient is 0.9.The material defect has an influence on the axial bearing capacity.Through the finite element modeling analysis.The theoretical value of the material in the elastic phase agrees well with the experimental value.【Conclusion】The application of hollow glulam wood column is feasible in practical engineering,which can meet the needs of engineering use,make full use of small sawn timber,improve the utilization rate of wood,reduce the cost,and have better mechanical performance than the log.