西安建筑科技大学学报(自然科学版)

腹板开孔梁因可提高空间利用率、经济美观、降低自重等特点被应用于钢结构建筑物中,而关于此类结构的抗倒塌性能研究较少,因此,有必要对此类结构的抗倒塌性能及关键参数进行研究.本文利用ABAQUS软件建立腹板开孔组合梁柱子结构的精细化有限元模型,以组合梁柱子结构的静力加载试验结果作为校验,验证了有限元建模方法的正确性.在此基础上,分析了开孔端距、开孔直径对腹板开孔组合梁柱子结构抗倒塌性能的影响,结果表明:不同的开孔端距会影响子结构边柱孔的破坏情况,而不同开孔直径会影响结构的断裂位置; 模型的承载能力与开孔端距呈正相关,与开孔直径呈负相关; 开孔端距与开孔直径对子结构的抗力发展影响较大.通过给出上述参数的合理取值范围建议,为腹板开孔组合结构抗倒塌设计提供依据.

Web-opening beams are employed in steel structure buildings because of its characteristics of improving space utilization, economical appearance, and reducing self-weight, but there are few studies on the collapse resistance of these structures. Therefore, it is necessary to study the collapse-resistant performance and influencing parameters of these structures. In this study, a refined finite element model of the composite beam-column substructure with web openings was established by ABAQUS software, and the static loading test results of the solid-web composite beam-column substructure are used as verification, which verify the correctness of the finite element modeling method. On this basis, the effects of important parameters such as opening end distance, opening diameter on the collapse resistance of composite beam-column structures with web openings are analyzed. The results show that different opening end distances will affect the failure of the substructure side column holes, while different opening diameters will affect the fracture position of the structure; the bearing capacity of the model is positively correlated with the opening end distance, and negatively correlated with the opening diameter; The opening end distance and the opening diameter has a significant influence on the resistance development of the substructure; The reasonable value ranges of these parameters are given, which provides the basis for the anti-collapse design of the composite structure with web openings.

引言
1 数值模型建立
2 模型验证
3 参数分析
4 结论

图1 原型结构<br/>Fig.1 The prototype structure

图1 原型结构
Fig.1 The prototype structure

图2 子结构选取(单位:mm)<br/>Fig.2 Selection of substructure(Unit: mm)

图2 子结构选取(单位:mm)
Fig.2 Selection of substructure(Unit: mm)

图3 节点尺寸及配筋分布图(单位:mm)<br/>Fig.3 Size of connections and distribution of reinforcement(Unit: mm)

图3 节点尺寸及配筋分布图(单位:mm)
Fig.3 Size of connections and distribution of reinforcement(Unit: mm)

图4 材料的本构关系<br/>Fig.4 Constitutive relationships of materials

图4 材料的本构关系
Fig.4 Constitutive relationships of materials

图5 有限元模型
Fig.5 Finite element model

图6 有限元模型验证<br/>Fig.6 Validation of the FE model

图6 有限元模型验证
Fig.6 Validation of the FE model

表1 不同开孔端距模型设计<br/>Tab.1 Design of models with different opening end distances

表1 不同开孔端距模型设计
Tab.1 Design of models with different opening end distances

图7 不同开孔端距下的荷载-位移曲线<br/>Fig.7 Load-displacement curves of different opening end distances

图7 不同开孔端距下的荷载-位移曲线
Fig.7 Load-displacement curves of different opening end distances

图8 破坏模式
Fig.8 Failure mode

图9 子结构力学分析模型<br/>Fig.9 Structural mechanics analysis model

图9 子结构力学分析模型
Fig.9 Structural mechanics analysis model

图10 机制抗力分析<br/>Fig.10 Analysis of mechanism resistances

图10 机制抗力分析
Fig.10 Analysis of mechanism resistances

表2 不同开孔直径模型设计<br/>Tab.2 Design of models with different hole diameters

表2 不同开孔直径模型设计
Tab.2 Design of models with different hole diameters

图11 不同开孔直径模型的荷载-位移曲线<br/>Fig.11 Load-displacement curves of models with different hole diameters

图11 不同开孔直径模型的荷载-位移曲线
Fig.11 Load-displacement curves of models with different hole diameters

图12 失效过程
Fig.12 Failure process

图13 机制抗力分析<br/>Fig.13 Analysis of mechanism resistances

图13 机制抗力分析
Fig.13 Analysis of mechanism resistances

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备注

引言

1 数值模型建立

2 模型验证

3 参数分析

4 结论

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