门式刚架控制截面尺寸和内力对节点设计影响
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摘要
通过罚函数对单跨铰接变截面门式刚架的优化截面尺寸和内力对节点螺栓、端板设计的影响分析发现,优化设计强调了刚架腹板高度的利用,且有效地改善控制截面内力的合理分布。但端板厚度用目前我国现行的CECS 102-2002《门式刚架轻型房屋钢结构技术规程》设计时,由于必须保证其厚度大于16 mm,致使不能有效地减少端板用钢量的投入。如果采用EUROCODE 3欧洲钢结构规范,则在刚架优化设计条件下,节点端板用材的节省效果将是明显的,在文章的算例中,C,B两节点的用材是传统设计条件下的80.78%。随着端板设计厚度的合理减小,还可以改变节点在反复荷载下的滞回曲线,有利于结构的抗震作用。建议相关部门在下一轮的规范或规程制定时,注意吸收国外的设计理念。
According to the analysis of control section and internal force through SUMT optimal portal frame design,optimal design not only emphasizes the use of the height of rigid frame web plate,but also effectively improves the rational distribution of internal force in control section.However,when we design node-connected endplate in the rules of portal frame design(CESCS102),it is required that the thickness of the plate should be greater than 16 mm,which makes it impossible to reduce the steel used in node-connected endplate design.If EUROCODE 3 constituted by European Committee of Steel Structure is adopted,the steel used in node-connected endplate design will reduced remarkably.In one example of the article,the input of steel in C and B nodes is 19.22% less than it is under traditional design condition.Along with the rational reduces of the endplate design thickness,the hysteresis curve in repeated loads may be changed,which has a beneficial earthquake resistant effect for structure.It is suggested that the foreign design conceptions should be used in the completion of the newer code and standard.
According to the analysis of control section and internal force through SUMT optimal portal frame design,optimal design not only emphasizes the use of the height of rigid frame web plate,but also effectively improves the rational distribution of internal force in control section.However,when we design node-connected endplate in the rules of portal frame design(CESCS102),it is required that the thickness of the plate should be greater than 16 mm,which makes it impossible to reduce the steel used in node-connected endplate design.If EUROCODE 3 constituted by European Committee of Steel Structure is adopted,the steel used in node-connected endplate design will reduced remarkably.In one example of the article,the input of steel in C and B nodes is 19.22% less than it is under traditional design condition.Along with the rational reduces of the endplate design thickness,the hysteresis curve in repeated loads may be changed,which has a beneficial earthquake resistant effect for structure.It is suggested that the foreign design conceptions should be used in the completion of the newer code and standard.
引文
[1]CECS 102-2002,门式刚架轻型房屋钢结构技术规程[S].
[2]EUROCODE 3,Design of Steel Structures[S].
[3]张炳华.土建结构优化设计(第二版)[M].上海:同济大学出版社,1998.
[4]覃文洁,程颖.现代设计方法概论[M].北京:北京理工大学出版社,2007.
[5]赵风华.钢结构设计原理[M].北京:高等教育出版社,2005.
[6]GB 50017-2003,钢结构设计规范[S].
[7]郝风祥.轻型厂房钢结构门式刚架节点板设计计算研究[J].钢结构,2001,16(2):8-10.
[8]戎伟,赵滇生.各国半刚性梁柱节点端板厚度计算方法的比较[J].山西建筑,2004,30(18):42-43.
[9]徐凌,徐亮,高松.外伸端板螺栓连接节点的强度和刚度研究[J].地震工程与工程震动,2006,26(2):88-91.
[10]石永久,廖新军,王元清,等.门式刚架梁柱Г形节点受力性能的试验研究[J].中国矿业大学学报,2005,34(3):327-332.
[2]EUROCODE 3,Design of Steel Structures[S].
[3]张炳华.土建结构优化设计(第二版)[M].上海:同济大学出版社,1998.
[4]覃文洁,程颖.现代设计方法概论[M].北京:北京理工大学出版社,2007.
[5]赵风华.钢结构设计原理[M].北京:高等教育出版社,2005.
[6]GB 50017-2003,钢结构设计规范[S].
[7]郝风祥.轻型厂房钢结构门式刚架节点板设计计算研究[J].钢结构,2001,16(2):8-10.
[8]戎伟,赵滇生.各国半刚性梁柱节点端板厚度计算方法的比较[J].山西建筑,2004,30(18):42-43.
[9]徐凌,徐亮,高松.外伸端板螺栓连接节点的强度和刚度研究[J].地震工程与工程震动,2006,26(2):88-91.
[10]石永久,廖新军,王元清,等.门式刚架梁柱Г形节点受力性能的试验研究[J].中国矿业大学学报,2005,34(3):327-332.
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