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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

37卷

期数:

2020年04期

页码:

60-68

栏目:

出版日期:

2020-07-30

文章信息/Info

Title:

Mechanical Mechanism of Steel-glulam Connections with Teeth on Splints

文章编号:

1673-2049(2020)04-0060-09

作者:

郁有升^1,2,周其霖¹,韩俊良¹

(1. 青岛理工大学 土木工程学院,山东 青岛 266033; 2. 青岛理工大学 山东省高等学校蓝色经济区工程建设与安全协同创新中心,山东 青岛 266033)

Author(s):

YU You-sheng^1,2, ZHOU Qi-lin¹, HAN Jun-liang¹

(1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China; 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, Shandong, China)

关键词:

胶合木网壳;  带齿夹板钢木连接节点;  受力机理;  单调荷载;  破坏模式

Keywords:

glulam reticulated shell;  steel-glulam connection with teeth on splint;  mechanical mechanism;  monotonic load;  failure mode

分类号:

TU366

DOI:

10.19815/j.jace.2019.05065

文献标志码:

A

摘要:

为解决胶合木网壳螺栓连接节点初始刚度低、木梁螺栓孔易发生劈裂的问题,提出一种带齿夹板钢木连接节点。通过试验研究了带齿夹板节点(JD-2)在单调荷载作用下的力学性能和破坏模式,并与同尺寸下不含钢齿的普通夹板节点(JD-1)进行对比分析。为深入研究带齿夹板节点的受力机理,对带齿夹板节点进行有限元模拟。结果表明:JD-1的破坏模式为木梁沿螺栓孔水平连线方向的横纹劈裂破坏,JD-2的破坏模式为夹板屈服破坏; 与JD-1相比,JD-2的初始刚度提高了47.18%,极限承载力提高了31.4%,延性系数提高了19.83%; 钢齿与木梁之间的机械咬合作用可以有效减少木梁螺栓孔初始间隙对节点刚度的不利影响; 在弯矩与剪力联合作用下,荷载通过钢齿及螺栓共同传递给木梁,减少了木梁螺栓孔的应力,因此延缓了木梁螺栓孔的开裂; 随着夹板翼缘厚度的增加,节点的受弯性能呈现增大的趋势; 增加夹板布齿率,木梁螺栓孔受到螺栓挤压应力减小,钢齿阻止夹板与木梁之间的相对滑动能力增强,建议夹板布齿率取0.46%～0.65%。

Abstract:

In order to solve the problems of low initial stiffness of bolted connections in glulam reticulated shells and easy splitting of bolt holes in glulam beams, a kind of steel-glulam connection with teeth on splints was proposed. The mechanical properties and failure modes of the connection with teeth on splints(JD-2)under monotonic load were studied by test and compared with the ordinary connection(JD-1)without teeth on splints under the same size. In order to study the stress mechanism of the splint connections with teeth, the finite element simulation of the connections was carried out. The results show that the failure mode of JD-1 is the transverse splitting along the horizontal direction of bolt holes in glulam beams, and that of JD-2 is yield failure of the splints. Compared with JD-1, the initial stiffness, ultimate bearing capacity and ductility of JD-2 are increased by 47.18%, 31.4% and 19.83% respectively. The mechanical biting effect between steel teeth and glulam beams can effectively reduce the adverse effect of the initial clearance of bolt holes on the stiffness of connections. Under the combined action of bending and shearing, the load is transmitted to the glulam beam through the steel teeth and bolts, which can reduce the stress around the bolt holes and delay the cracking of the bolt holes in the glulam beam. With the increase of the thickness of the splint flange, the flexural behavior of the connections tends to increase. With the increase of steel teeth ratio, the stress of the bolt holes of glulam beams is reduced by the extrusion of the bolt, and the ability of steel teeth to prevent the relative sliding between splint and glulam beams is enhanced. It is suggested that the steel teeth ratio is 0.46%-0.65%.

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相似文献/References:

[1]魏志鹏,李 军,李牧原,等.基于异型件连接的胶合木网壳节点受力性能研究[J].建筑科学与工程学报,2023,40(02):59.[doi:10.19815/j.jace.2021.10001]
　WEI Zhipeng,LI Jun,LI Muyuan,et al.Research on mechanical behavior of joints based on special-shaped connection in reticulated glulam shell[J].Journal of Architecture and Civil Engineering,2023,40(04):59.[doi:10.19815/j.jace.2021.10001]

备注/Memo

备注/Memo:

收稿日期:2019-07-16
基金项目:国家重点研发计划项目(2017YFC0703506)
作者简介:郁有升(1976-),男,山东莒南人,副教授,工学博士,E-mail:yuyousheng@126.com。

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更新日期/Last Update: 2020-07-29