西安建筑科技大学学报(自然科学版)

直接分析法作为基于二阶非线性分析的高等分析方法,可以真实的反映出结构的初始缺陷、节点半刚性、结构和材料的非线性行为,反映出更准确的结构内力.扣件式钢管模板支架作为细长临时支撑结构,针对其杆件和连接非线性行为显著、明显的二阶效应、初始缺陷较大等特点,采用直接分析法对扣件式钢管模板支架设计,可获取更准确的整架体系非线性行为和失效模式,在设计过程中即可考虑失效后果.通过对结构整体缺陷、构件缺陷和节点半刚性的定量化讨论,并利用SAP2000软件对在构件初始缺陷、节点半刚性和二阶效应耦合作用下的扣件式钢管模板支架进行直接分析法分析,其分析结果与试验结果对比分析表明:采用直接分析理论得到的结果与试验数据相吻合,说明了直接分析法在扣件式钢管模板支架内力计算的准确可靠,在扣件式钢管模架体系稳定设计中具备适用性,为制定相关规范提供新思路.

As an advanced analysis method based on second-order nonlinear analysis,the direct analysis method can truly reflect the initial defects of the structure,the semi-rigidity of the joint,the nonlinear behavior of the structure and the material,and reflect the more accurate internal forces of the structure. As a slender temporary support structure,coupler-style steel tubular formwork support has the characteristics of significant nonlinear behavior of bars and connections,obvious second-order effect and large initial defects. So,the direct analysis method can be used to design coupler-style steel tubular formwork support to obtain more accurate nonlinear behavior and failure modes of the entire frame system,and the failure consequences can be considered in the design process. Based on the quantitative discussion of the overall defects of the structure,the defects of the component and the semi-rigidity of the joint,the direct analysis method is used to analyze coupler-style steel tubular formwork support under the coupling action of initial defects of the component,the semi-rigidity of the joint and second-order effect by means of SAP2000 software,and then the analysis results are compared with the test results. The results show that the results obtained by using the direct analysis theory are consistent with the test data,which indicates that the direct analysis method is accurate and reliable in the calculation of the internal forces of the coupler-style steel tubular formwork support,and has applicability in the stable design of coupler-style steel tubular formwork supports system,and provides a new idea for the formulation of relevant codes.

引言
1 对初始缺陷、节点半刚性的定量化讨论
2 试验实测
3 模拟分析验证
4 结论

图1 构件初始几何缺陷<br/>Fig.1 Initial geometric defects of the component

图1 构件初始几何缺陷
Fig.1 Initial geometric defects of the component

图2 L/1000初弯曲轴压钢管模型<br/>Fig.2 L/1000 Initial bending crankshaft compression steel tube model

图2 L/1000初弯曲轴压钢管模型
Fig.2 L/1000 Initial bending crankshaft compression steel tube model

表1 钢管的几何特性<br/>Tab.1 Geometric characteristics of steel tubes

表1 钢管的几何特性
Tab.1 Geometric characteristics of steel tubes

图3 L/1000初弯曲下的柱子曲线<br/>Fig.3 Column curve under initial bending of L/1000

图3 L/1000初弯曲下的柱子曲线
Fig.3 Column curve under initial bending of L/1000

图4 考虑不同初弯曲和残余应力的柱子曲线<br/>Fig.4 Column curves considering different initial bending and residual stresses

图4 考虑不同初弯曲和残余应力的柱子曲线
Fig.4 Column curves considering different initial bending and residual stresses

表2 b1、b2参数表<br/>Tab.2 Parameters of b1 and b2

表2 b1、b2参数表
Tab.2 Parameters of b1 and b2

图5 不同初始弯曲下的e0/l-λ曲线图<br/>Fig.5 e0/l-λ curves at different initial bends

图5 不同初始弯曲下的e0/l-λ曲线图
Fig.5 e0/l-λ curves at different initial bends

表3 不同搭设参数设置的搭设方案<br/>Tab.3 Setting schemes of different setting parameters

表3 不同搭设参数设置的搭设方案
Tab.3 Setting schemes of different setting parameters

图6 立杆测点平面布置<br/>Fig.6 Plane arrangement of measuring points of vertical

图6 立杆测点平面布置
Fig.6 Plane arrangement of measuring points of vertical

图7 立杆纵向监测点布置<br/>Fig.7 Arrangement of vertical monitoring points of vertical poles

图7 立杆纵向监测点布置
Fig.7 Arrangement of vertical monitoring points of vertical poles

表4 各工况极限稳定承载力<br/>Tab.4 Ultimate stable bearing capacity under various working conditions

表4 各工况极限稳定承载力
Tab.4 Ultimate stable bearing capacity under various working conditions

图8 工况4下的B1、B3、B6杆端荷载位移曲线<br/>Fig.8 Load displacement curve of B1、B3、B6 rod end under working condition 4

图8 工况4下的B1、B3、B6杆端荷载位移曲线
Fig.8 Load displacement curve of B1、B3、B6 rod end under working condition 4

图9 工况3、4、5下的B1杆端荷载位移曲线<br/>Fig.9 Load displacement curve of B1 rod end under working condition 3、4、5

图9 工况3、4、5下的B1杆端荷载位移曲线
Fig.9 Load displacement curve of B1 rod end under working condition 3、4、5

表5 各工况在SAP2000模拟下极限稳定承载力与误差值<br/>Tab.5 Ultimate stability bearing capacity and error value of each working condition under sap2000 simulation

表5 各工况在SAP2000模拟下极限稳定承载力与误差值
Tab.5 Ultimate stability bearing capacity and error value of each working condition under sap2000 simulation

图10 工况3下B1杆端位移荷载曲线对比分析<br/>Fig.10 Comparative analysis of B1 rod end displacement load curve under working condition 3

图10 工况3下B1杆端位移荷载曲线对比分析
Fig.10 Comparative analysis of B1 rod end displacement load curve under working condition 3

图11 工况4下B1杆端位移荷载曲线对比分析<br/>Fig.11 Comparative analysis of B1 rod end displacement load curve under working condition 4

图11 工况4下B1杆端位移荷载曲线对比分析
Fig.11 Comparative analysis of B1 rod end displacement load curve under working condition 4

图12 工况5下B1杆端位移荷载位移曲线对比<br/>Fig.12 Comparative analysis of B1 rod end displacement load curve under working condition 5

图12 工况5下B1杆端位移荷载位移曲线对比
Fig.12 Comparative analysis of B1 rod end displacement load curve under working condition 5

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备注

引言

1 对初始缺陷、节点半刚性的定量化讨论

2 试验实测

3 模拟分析验证

4 结论

期刊信息