欧洲规范EC3 Part 1-1第5章[1]允许工程师使用一些先进的有限元分析软件来分析和设计钢结构,如线弹性、刚塑性以及二阶弹塑性整体分析。这3种极不相同的分析方法,能够用于简支、半连续以及连续节点模型中[2]。节点模型根据刚度的不同,...欧洲规范EC3 Part 1-1第5章[1]允许工程师使用一些先进的有限元分析软件来分析和设计钢结构,如线弹性、刚塑性以及二阶弹塑性整体分析。这3种极不相同的分析方法,能够用于简支、半连续以及连续节点模型中[2]。节点模型根据刚度的不同,可分为铰接、半刚性和刚性模型;按照强度的不同,可分为铰接、部分强度和全强度模型。尽管大多数的工程问题仅仅要求进行线弹性分析,但仍有一些特殊结构可能要求采用高级分析以降低施工成本,例如底层无支撑钢框架结构。在这种结构中,采用半连续节点(具有半刚度和部分强度特性)进行框架分析,会显著增强结构抵抗名义水平荷载、风荷载、整体缺陷、地震作用时的抗侧刚度和强度,因此在控制的水平荷载下计算的横向侧移可能在EC3允许的范围内。在基于性能的抗火设计中,结构抗火工程师可能想利用钢节点潜在的刚度和强度,尤其是有端板节点的钢结构,这是一种最常见的钢结构施工形式。端板可以是部分深度的,或者是延伸端板,涵盖了名义铰接、半刚性和完全刚性节点模型。本文给出了端板节点高温性能研究的一系列数值分析结果;应用基于构件的方法,建立了这些节点在高温下的力学反应计算公式,以及梁腹板剪应力分量、连接处的拉应力和压应力区域的力学模型。基于构件的方法能够考虑钢节点的热约束效应。对已有钢端板节点试验进行了有限元模拟和基于构件的分析表明,2种方法的分析结果与试验结果的偏差都是可接受的,包括热约束效应。展开更多
This paper presented a methodology for the analysis and design of steel connections under a double-span connection within the context of preventing progressive collapse. First, various connection models were described...This paper presented a methodology for the analysis and design of steel connections under a double-span connection within the context of preventing progressive collapse. First, various connection models were described and their pros and cons were provided. Then, the load-displacement characteristics of a component-based spring model were described. Thirdly, an experi-mental study on the behaviors of shear tab connections under tension was presented. The main sources of the deformation capacity of the shear tab connections were identified. Finally, a design example of a shear tab connection was provided to illustrate the methodology.展开更多
Through the comparative analysis of steel plate reinforced, ceramics reinforced and non- reinforced joints under loading condition, the feasibility of strengthening steel joint of architectural structure was studied. ...Through the comparative analysis of steel plate reinforced, ceramics reinforced and non- reinforced joints under loading condition, the feasibility of strengthening steel joint of architectural structure was studied. By using element birth and death technology simulation of the finite element software ANSYS, it is found that when the reinforced structure is 10 mm in thickness and using steel structure to reinforce the concemed areas, the equivalent stress in concerned regionals reduces by 31.1% compared with that when the structure is not reinforced. When reinforced with ceramics, the equivalent stress in concerned regionals reduces by 24.1% compared with that reinforced with steels; when the reinforced structure is 20 mm in thickness using steels to reinforce the concerned area, the equivalent stress in concerned regionals reduces by 39.4% compared with that when the structure is not reinforced. When using ceramics to reinforce the concerned areas, the eauivalent stress only decreases by 3.7% compared with that reinforced with steels.展开更多
文摘欧洲规范EC3 Part 1-1第5章[1]允许工程师使用一些先进的有限元分析软件来分析和设计钢结构,如线弹性、刚塑性以及二阶弹塑性整体分析。这3种极不相同的分析方法,能够用于简支、半连续以及连续节点模型中[2]。节点模型根据刚度的不同,可分为铰接、半刚性和刚性模型;按照强度的不同,可分为铰接、部分强度和全强度模型。尽管大多数的工程问题仅仅要求进行线弹性分析,但仍有一些特殊结构可能要求采用高级分析以降低施工成本,例如底层无支撑钢框架结构。在这种结构中,采用半连续节点(具有半刚度和部分强度特性)进行框架分析,会显著增强结构抵抗名义水平荷载、风荷载、整体缺陷、地震作用时的抗侧刚度和强度,因此在控制的水平荷载下计算的横向侧移可能在EC3允许的范围内。在基于性能的抗火设计中,结构抗火工程师可能想利用钢节点潜在的刚度和强度,尤其是有端板节点的钢结构,这是一种最常见的钢结构施工形式。端板可以是部分深度的,或者是延伸端板,涵盖了名义铰接、半刚性和完全刚性节点模型。本文给出了端板节点高温性能研究的一系列数值分析结果;应用基于构件的方法,建立了这些节点在高温下的力学反应计算公式,以及梁腹板剪应力分量、连接处的拉应力和压应力区域的力学模型。基于构件的方法能够考虑钢节点的热约束效应。对已有钢端板节点试验进行了有限元模拟和基于构件的分析表明,2种方法的分析结果与试验结果的偏差都是可接受的,包括热约束效应。
文摘This paper presented a methodology for the analysis and design of steel connections under a double-span connection within the context of preventing progressive collapse. First, various connection models were described and their pros and cons were provided. Then, the load-displacement characteristics of a component-based spring model were described. Thirdly, an experi-mental study on the behaviors of shear tab connections under tension was presented. The main sources of the deformation capacity of the shear tab connections were identified. Finally, a design example of a shear tab connection was provided to illustrate the methodology.
基金Funded by the National Natural Science Foundation of China (No.51178365)
文摘Through the comparative analysis of steel plate reinforced, ceramics reinforced and non- reinforced joints under loading condition, the feasibility of strengthening steel joint of architectural structure was studied. By using element birth and death technology simulation of the finite element software ANSYS, it is found that when the reinforced structure is 10 mm in thickness and using steel structure to reinforce the concemed areas, the equivalent stress in concerned regionals reduces by 31.1% compared with that when the structure is not reinforced. When reinforced with ceramics, the equivalent stress in concerned regionals reduces by 24.1% compared with that reinforced with steels; when the reinforced structure is 20 mm in thickness using steels to reinforce the concerned area, the equivalent stress in concerned regionals reduces by 39.4% compared with that when the structure is not reinforced. When using ceramics to reinforce the concerned areas, the eauivalent stress only decreases by 3.7% compared with that reinforced with steels.
基金the financial support from International Precast Hollowcore Association(IPHA)and Oversea Research Scholarship(ORS)support provided by Severfield-Revee Structures Ltd
