西安建筑科技大学学报(自然科学版)

高层钢框筒结构通常由水平荷载起控制作用,用轴压比和等效实膜筒法确定的截面尺寸较粗糙,需反复试算和调整,耗费大量人力与机时.针对这个问题,提出了高层钢框筒构件截面尺寸预估的新方法,综合考虑了强柱弱梁思想、结构受力特性和设计经验,并用2个算例验证了预估方法的有效性,同时对它们进行了倒三角分布、SRSS分布和高度等效分布侧向力模式下的Pushover分析和比较,讨论了考虑摇摆柱影响的放大系数简化计算和预估轴压比计算的可行性.该预估方法可较快预估出满足规范要求的构件尺寸,对不同抗震设防区的高层钢框筒结构的构件尺寸预估均适用,不过初始截面尺寸仍需进一步优化.该方法可供其他高层钢结构形式的构件尺寸预估参考.

Design of high-rise steel framed-tube structure is usually controlled by horizontal load, and the cross-sectional dimension determined by axial compression ratio or equivalent membrane tube method is not effective, which need to be adjusted again and again with a lot of manpower and machine time. To address this problem, a new method for estimating section dimension of high-rise steel framed-tube structure is put forward, which considers strong column weak beam concept, mechanical characteristics and design experience comprehensively, and two examples are used to verify the effectiveness of the estimation method. At the same time, Pushover analysis of two examples are carried out under inverted triangle distribution, SRSS distribution and highly equivalent distribution lateral load pattern. Their results are compared. The feasibility of simplified calculation of magnification coefficient with influence of swing columns and calculation of estimated axial compression ratio is discussed. The method can quickly estimate component dimension to meet the requirements of design specifications, and it is suitable for component dimension estimation of high-rise steel framed-tube structure in different seismic fortification areas.Initial section dimension still needs to be further optimized. The method can be used as a reference for member dimension estimation of other high-rise steel structures.

引言
1 钢框筒结构的设计
2 算例设计与分析
3 结论

图1 钢框筒结构平面图<br/>Fig.1 The plan of steel framed-tube structure

图1 钢框筒结构平面图
Fig.1 The plan of steel framed-tube structure

图2 楼板荷载传递示意图<br/>Fig.2 Schematic diagram of floor load transfer

图2 楼板荷载传递示意图
Fig.2 Schematic diagram of floor load transfer

图3 典型楼层与不利楼层<br/>Fig.3 Typical floor and adverse floor

图3 典型楼层与不利楼层
Fig.3 Typical floor and adverse floor

表1 裙梁截面尺寸的估计<br/>Tab.1 Estimation of section dimension of spandrel beams

表1 裙梁截面尺寸的估计
Tab.1 Estimation of section dimension of spandrel beams

表2 典型楼层的中柱节点的强柱弱梁验算<br/>Tab.2 Checking of strong column weak beam of side column joint of typical floors

表2 典型楼层的中柱节点的强柱弱梁验算
Tab.2 Checking of strong column weak beam of side column joint of typical floors

表3 典型楼层的中柱长细比的验算<br/>Tab.3 Checking of slenderness ratio of side column of typical floors

表3 典型楼层的中柱长细比的验算
Tab.3 Checking of slenderness ratio of side column of typical floors

表4 20层钢框筒截面尺寸估计的结果<br/>Tab.4 Estimation of section dimension of 20-storey steel framed-tube structure mm

表4 20层钢框筒截面尺寸估计的结果
Tab.4 Estimation of section dimension of 20-storey steel framed-tube structure mm

表5 40层钢框筒截面尺寸估计的结果<br/>Tab.5 Estimation of section dimension of 40-storey steel framed-tube structure mm

表5 40层钢框筒截面尺寸估计的结果
Tab.5 Estimation of section dimension of 40-storey steel framed-tube structure mm

图4 基底剪力-顶点位移曲线和塑性铰分布<br/>Fig.4 Base shear-vertex displacement curves and plastic hinge distribution

图4 基底剪力-顶点位移曲线和塑性铰分布
Fig.4 Base shear-vertex displacement curves and plastic hinge distribution

表6 小震下的基底剪力峰值<br/>Tab.6 Base shear peak value under frequent earthquake

表6 小震下的基底剪力峰值
Tab.6 Base shear peak value under frequent earthquake

图5 加速度谱曲线的比较<br/>Fig.5 Comparison of acceleration spectrum curves

图5 加速度谱曲线的比较
Fig.5 Comparison of acceleration spectrum curves

图6 基底剪力-顶点位移曲线和塑性铰分布<br/>Fig.6 Base shear-vertex displacement curves and plastic hinge distribution

图6 基底剪力-顶点位移曲线和塑性铰分布
Fig.6 Base shear-vertex displacement curves and plastic hinge distribution

表7 不同侧向力模式下钢框筒的性能点<br/>Tab.7 Performance point of steel structure in different lateral loading patterns

表7 不同侧向力模式下钢框筒的性能点
Tab.7 Performance point of steel structure in different lateral loading patterns

表8 预估轴压比与计算轴压比的比较<br/>Tab.8 Comparison of axial compression ratio estimated and axial compression ratio calculated

表8 预估轴压比与计算轴压比的比较
Tab.8 Comparison of axial compression ratio estimated and axial compression ratio calculated

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备注

引言

1 钢框筒结构的设计

2 算例设计与分析

3 结论

期刊信息