Simplified procedure for the estimation of local inelastic deformation demands for seismic performance assessment of buildings

The implementation of performance‐based design and assessment procedures in seismic codes leads to the need for an accurate estimation of local component demands. According to Part 3 of Eurocode 8 safety checks should be always conducted in terms of plastic rotations, even when linear elastic methods of analysis are used. This paper demonstrates that linear analysis fails to predict inelastic deformation demands at the member level. Therefore, a simplified procedure that allows for the estimation of beam inelastic deformation demands using linear elastic methods of analysis in a simple and conservative way is presented herein. A number of moment‐resisting steel frames designed according to different criteria and exhibiting different column‐to‐beam strength ratios were analysed and used for the derivation of the proposed procedure. A comparative study between alternative methods of quantifying inelastic deformation demands using linear analysis is also carried out. The results obtained allow concluding about the efficiency and conservativeness of the proposed procedure which makes it attractive to be employed in engineering practice. Copyright © 2016 John Wiley & Sons, Ltd.     

高温环境中主管轴力对焊接圆钢管T节点承载性能的影响

利用有限元软件ABAQUS建立T型圆钢管节点热传导分析模型,通过与已有试验数据进行对比,验证了所建有限元模型的可靠性。利用提出的有限元模型分析了不同主管轴力作用下的T型圆钢管节点在火灾环境中的失效过程,研究了主管轴力对T型圆钢管节点临界温度的影响规律。分别讨论了采用屈服强度折减和弹性模量折减的方法预测T型圆钢管节点在高温下的极限承载力,并将预测结果和有限元分析结果进行了对比,给出了这两种方法用于工程设计时的建议。     

弦线法解算大地测量主题精密公式

本文通过引入测站切面空间直角坐标系,导出用椭球面上弦线解算长距离大地测量主题正、反算精密公式。理论严密,公式封闭简单,宜于电算。为了便于实用,本文还扩展了相应的归算公式。     

计算凸域弦长分布函数的方法

利用广义支持函数和限弦函数讨论了弦长分布函数的计算问题,得到正三角形的弦长分布函数的显式表达式,所提供的方法具有普适性.