以滁州大山风电场—古河110 k V输电线路工程的钢管式栈桥结构为工程背景,对钢管式栈桥结构在水域中修建时所面临的问题,如栈桥设计标准的确定、荷载的计算方法等,进行较为系统的研究。同时采用有限元法对该栈桥结构进行力学性能分析,...以滁州大山风电场—古河110 k V输电线路工程的钢管式栈桥结构为工程背景,对钢管式栈桥结构在水域中修建时所面临的问题,如栈桥设计标准的确定、荷载的计算方法等,进行较为系统的研究。同时采用有限元法对该栈桥结构进行力学性能分析,并介绍该类栈桥结构的适用范围及施工工艺。提出的结构方案已在滁州大山风电场—古河110 k V输电线路工程中得到成功的应用。展开更多
Difference processing was used to the direct current magnetic flux leakage （DC-MFL） signal, emanating from the defects machined artificially on the internal and external surfaces of a steel pipe. Consequently, the l...Difference processing was used to the direct current magnetic flux leakage （DC-MFL） signal, emanating from the defects machined artificially on the internal and external surfaces of a steel pipe. Consequently, the loea-tion discriminating index 8 was provided to identify the defect whether it is on the internal surface or the external one. Three characteristics, shape, depth and orientation of the defect, were discussed through a series of experiments on the artificial defects, such as transverse notches, oblique notches and pits on the steel pipe. The approach has been verified effective to address the defect location identifying problem, albeit the limits on the accuracy assessment to those natural defects on steel pipes in service.展开更多
Based on Hencky＇s total strain theory of plasticity,ultimate bending capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material,the simplified analytical solution is p...Based on Hencky＇s total strain theory of plasticity,ultimate bending capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material,the simplified analytical solution is proposed as well.Good agreement is observed when ultimate bending capacities obtained from analytical solutions are compared with experimental results from full-size tests of steel pipes.Parametric study conducted as part of this paper indicates that the strain hardening effect has significant influence on the ultimate bending capacity of steel pipes.It is shown that pipe considering strain hardening yields higher bending capacity than that of pipe assumed as elastic-perfectly plastic material.Thus,the ignorance of strain hardening effect,as commonly assumed in current codes,may underestimate the ultimate bending capacity of steel pipes.The solutions proposed in this paper are applicable in the design of offshore/onshore steel pipes,supports of offshore platforms and other tubular structural steel members.展开更多
文摘以滁州大山风电场—古河110 k V输电线路工程的钢管式栈桥结构为工程背景,对钢管式栈桥结构在水域中修建时所面临的问题,如栈桥设计标准的确定、荷载的计算方法等,进行较为系统的研究。同时采用有限元法对该栈桥结构进行力学性能分析,并介绍该类栈桥结构的适用范围及施工工艺。提出的结构方案已在滁州大山风电场—古河110 k V输电线路工程中得到成功的应用。
基金supported by the National Natural Science Foundation of China under Grant No.50675083
文摘Difference processing was used to the direct current magnetic flux leakage （DC-MFL） signal, emanating from the defects machined artificially on the internal and external surfaces of a steel pipe. Consequently, the loea-tion discriminating index 8 was provided to identify the defect whether it is on the internal surface or the external one. Three characteristics, shape, depth and orientation of the defect, were discussed through a series of experiments on the artificial defects, such as transverse notches, oblique notches and pits on the steel pipe. The approach has been verified effective to address the defect location identifying problem, albeit the limits on the accuracy assessment to those natural defects on steel pipes in service.
基金financially supported by the National Natural Science Foundation of China(Grant No.51309236)the Opening Fund of State Key Laboratory of Ocean Engineering(Shanghai Jiao Tong University)(Grant No.1314)+2 种基金the Opening Fund of State Key Laboratory of Hydraulic Engineering Simulation and Safety(Tianjin University)(Grant No HESS-1411)the Opening Fund of State Key Laboratory of Coastal and Offshore Engineering(Dalian University of Technology)(Grant No.LP1507)the Science Foundation of China University of Petroleum,Beijing(Grant Nos.2462015YQ0403 and 2462015YQ0408)
文摘Based on Hencky＇s total strain theory of plasticity,ultimate bending capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material,the simplified analytical solution is proposed as well.Good agreement is observed when ultimate bending capacities obtained from analytical solutions are compared with experimental results from full-size tests of steel pipes.Parametric study conducted as part of this paper indicates that the strain hardening effect has significant influence on the ultimate bending capacity of steel pipes.It is shown that pipe considering strain hardening yields higher bending capacity than that of pipe assumed as elastic-perfectly plastic material.Thus,the ignorance of strain hardening effect,as commonly assumed in current codes,may underestimate the ultimate bending capacity of steel pipes.The solutions proposed in this paper are applicable in the design of offshore/onshore steel pipes,supports of offshore platforms and other tubular structural steel members.
