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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (11): 2100-2108    DOI: 10.3785/j.issn.1008-973X.2020.11.005
土木工程     
单层网壳预埋螺栓装配式节点六杆模型试验
金跃东(),汪儒灏,赵阳*()
浙江大学 空间结构研究中心，浙江 杭州 310058
Experiment of six-member basic structure with a pre-embedded-bolt joint for single-layer latticed shells
Yue-dong JIN(),Ru-hao WANG,Yang ZHAO*()
Space Structures Research Center, Zhejiang University, Hangzhou 310058, China
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摘要：

参考常见球面网壳节点，以螺栓直径、螺栓间距、节点体壁厚以及杆件与节点体夹角为主要参数，设计8个采用矩形截面预埋螺栓装配式节点的六杆模型，开展静力试验研究和有限元模拟. 试验结果表明，节点体中空六棱台设计可以有效实现杆件与节点体之间的角度连接；螺栓直径和螺栓间距的减小会导致试件刚度和极限荷载降低，并使得试件失效模式由杆件失效控制逐步过渡为螺栓失效控制；节点体壁厚的减小几乎不影响试件的初始刚度，但会降低试件的极限荷载. 采用SOLID186实体单元对六杆模型建模，并利用CONTA174/TARGE170接触对单元模拟接触效应, 有限元模型的荷载-位移曲线与试验结果较吻合，杆件处应力分布与试验结果接近. 该考虑接触效应的有限元模型可以较为准确地预测试件的初始刚度和极限荷载.
关键词： 单层网壳;  矩形钢管;  装配式节点;  静力试验;  六杆模型    
Abstract:

Experiment study and finite element simulation were conducted on 8 six-member basic structure with a pre-embedded-bolt joint designed for rectangular sections according to practical single-layer spherical latticed shells joints. The influence of the diameter of bolts, the distance of bolts, the wall thickness of node and the angle between members and node were studied during the test. Results show that the angle between members and node can be fulfilled by the hollow-six-prism design of node. The initial stiffness of specimens is weakened as well as the ultimate load, and the failure mode transforms from member-control mode to bolt-control mode with the decrease of bolts diameter and distance. The descent of node wall thickness has no effect on the initial stiffness of structure, but may decline the ultimate load. Element SOLID186 was applied in the finite element model while contact pair element CONTA174/TAEGE170 was used to simulate the contact effect. The load-displacement curves and the distribution of stress of finite element model fitted well with test results. The good fit between the finite element results and the test results indicates that the solid element finite element model with consideration of contact effect is reliable to predict the initial stiffness and ultimate load of specimens.
Key words: single-layer latticed shell    rectangular steel tube    assembly joint    static test    six-member basic structure
收稿日期: 2019-12-02 出版日期: 2020-12-15
CLC:  TU 393  
基金资助: 国家自然科学基金资助项目（51778567）
通讯作者: 赵阳     E-mail: jyd_ce@zju.edu.cn;ceyzhao@zju.edu.cn
作者简介: 金跃东（1992—），男，博士生，从事空间结构研究. orcid.org/0000-0001-7209-1587. E-mail： jyd_ce@zju.edu.cn
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引用本文:

金跃东,汪儒灏,赵阳. 单层网壳预埋螺栓装配式节点六杆模型试验[J]. 浙江大学学报(工学版), 2020, 54(11): 2100-2108.

Yue-dong JIN,Ru-hao WANG,Yang ZHAO. Experiment of six-member basic structure with a pre-embedded-bolt joint for single-layer latticed shells. Journal of ZheJiang University (Engineering Science), 2020, 54(11): 2100-2108.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.11.005    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I11/2100

图 1  六杆模型示意图
图 2  节点体的构造及尺寸
图 3  试件现场装配流程图
试件编号 杆件截面规格/mm 高强螺栓规格 D /mm $ \theta $ /(°) t /mm
S1 120×60×4 M20 65 4 20
S2 120×60×4 M16 65 4 20
S3 120×60×4 M14 65 4 20
S4 120×60×4 M20 55 4 20
S5 120×60×4 M20 45 4 20
S6 120×60×4 M20 65 4 15
S7 120×60×4 M20 65 4 10
S8 120×60×4 M20 65 8 20
表 1  各组试件详细尺寸
图 4  装配完成后内、外螺母间距示意图
组件 材料标号 σs /MPa σb /MPa E /GPa
节点体 45# 314.3 609.7 209.7
杆件端板 Q345b 352.3 477.7 204.3
矩形杆件 Q235b 327.0 389.5 207.0
表 2  试件各组件材性试验结果
图 5  加载装置现场图
图 6  试件1号杆件应变测点布置图
图 7  各组试件的荷载-位移曲线
图 8  试件S3螺纹失效
图 9  试件S1及S8的荷载-应变曲线
试件编号 $ K $ /(kN?mm?1) ${P}_{{\rm{u}}}$ /kN $ {\eta }_{K} $ $ {\eta }_{P} $ $ \varepsilon $ /10?6
测点1 测点3
S1 37.51 238 1.00 1.00 ?6719 ?4217
S2 30.81 223 0.82 0.94 ?2893 ?1636
S3 20.11 105 0.73 0.44 ?708 ?650
S4 36.62 219 0.98 0.92 ?2825 ?1612
S5 22.81 194 0.61 0.82 ?1507 ?1419
S6 37.06 211 0.99 0.89 ?1767 ?1004
S7 38.20 191 1.01 0.80 ?1726 ?463
S8 56.92 320 1.52 1.34 ?5950 ?4461
表 3  试件主要试验结果
组件 单元类型 网格类型 网格尺寸 单元数量
节点体 SOLID186 四面体 2 101301
端板 SOLID186 四面体 6 11661
螺栓及螺母 SOLID186 六面体 2 37234
杆件 SOLID186 六面体 3 78153
接触单元 CONTA174/TARGE170 系统自动划分 18265
总计 ? ? 246614
表 4  ANSYS有限元模型参数
图 10  试件ANSYS软件有限元模型
图 11  ANSYS有限元模型网格划分
图 12  有限元模型接触面示意图
图 13  试件S1和S8杆件轴向应力分布云图
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