Generalized plastic hinge for ultimate bearing capacity of rigid-framed structures
Yang Lufeng1,2 Bai Dalian1,2 Yang Dawei2,3
1. School of Civil Engineering & Architecture,Guangxi University,Nanning 530004,China;
2. Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education,Guangxi University,Nanning 530004,China;
3. Anhui Transport Consulting and Design Institute Co.,Ltd.,Hefei 230088,China
Abstract:The traditional plastic hinge method (PHM) and its improved methods (iPHM) have proportional property,which can be used to determine rapidly the position of plastic hinge and ultimate bearing capacity of rigid-framed structures. However,these methods cannot be applied to rigid-framed structures under multiple internal forces. The second-order plastic hinge method (SPHM) and the refined plastic hinge method (RPHM) subsequently developed can solve this problem,but they don’t have the proportional property,and instead they require a large number of iterative trials to determine the position of hinge position and ultimate bearing capacity. Hence,the two methods are inevitably complex and inefficient. In this work,a generalized plastic hinge method (GPHM) with proportional property was developed on the basis of the generalized yield criterion and the combining factor of internal forces to figure out the difficulties. Firstly,the combing factor of internal forces was presented to modify the element sectional strength at each loading step. Secondly,the element bearing ratio is defined by homogeneous generalized yield function and standardized internal force,then the plastic hinge position and ultimate bearing capacity of frame can be determined by the proportional property. Finally,comparison of GPHM with EPIA and iPHM was performed to demonstrate the high accuracy and efficiency of the proposed GPHM.
杨绿峰 柏大炼 杨大尉 . 刚架结构极限承载力分析的广义塑性铰研究[J]. 土木工程学报, 2020, 53(4): 31-37.
Yang Lufeng Bai Dalian Yang Dawei. Generalized plastic hinge for ultimate bearing capacity of rigid-framed structures. 土木工程学报, 2020, 53(4): 31-37.