Alternate path(AP) method is the most widely used method for the progressive collapse analysis,and its application in frame structures has been well proved.However,the application of AP method for other structures,esp...Alternate path(AP) method is the most widely used method for the progressive collapse analysis,and its application in frame structures has been well proved.However,the application of AP method for other structures,especially for cable-stayed structures,should be further developed.The four analytical procedures,i.e.,linear static,nonlinear static,linear dynamic,and nonlinear dynamic were firstly improved by taking into account the initial state.Then a cable-stayed structure was studied using the four improved methods.Furthermore,the losses of both one cable and two cables were discussed.The results show that for static and dynamic analyses of the cable-stayed bridges,there is large difference between the results obtained from simulations starting with either a deformed or a nondeformed configuration at the time of cable loss.The static results are conservative in the vicinity of the ruptured cable,but the dynamic effect of the cable loss in the area farther away from the loss-cable cannot be considered.Moreover,the dynamic amplification factor of 2.0 is found to be a good estimate for static analysis procedures,since linear static and linear dynamic procedures yield approximately the same maximum vertical deflection.The results of the comprehensive evaluation of the cable failure show that the tread of the progressive failure of the cable-stayed bridges decreases when the location of the failed cables is closer to the pylon.展开更多
对1起近期发生的220kV交联聚乙烯(crosslinked polyethylene,XLPE)高压电缆中间接头故障情况进行了描述。通过对故障接头进行详细解体分析,认为环氧浇注材料入网前存在缺陷可能是造成接头故障的主要原因。为避免今后发生同类事故,提出...对1起近期发生的220kV交联聚乙烯(crosslinked polyethylene,XLPE)高压电缆中间接头故障情况进行了描述。通过对故障接头进行详细解体分析,认为环氧浇注材料入网前存在缺陷可能是造成接头故障的主要原因。为避免今后发生同类事故,提出应该从严格电缆验收管理及加强电缆运行中状态检测2个方面入手,特别是应在细化干扰分析策略、丰富现场检测手段及推进测试人员专业化等方面加大力度,并重点关注开展甚高频法(very high frequency,VHF)和超高频法(ultra high frequency,UHF)联合检测。展开更多
基金supported by the National Natural Science Foundation of China(No. 50478075)the Jiangsu "Six Top Talent" Program of China(No. 07-F-008)+1 种基金the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Scientific Research Foundation of Graduate School of Southeast University (No. YBJJ0817),China
文摘Alternate path(AP) method is the most widely used method for the progressive collapse analysis,and its application in frame structures has been well proved.However,the application of AP method for other structures,especially for cable-stayed structures,should be further developed.The four analytical procedures,i.e.,linear static,nonlinear static,linear dynamic,and nonlinear dynamic were firstly improved by taking into account the initial state.Then a cable-stayed structure was studied using the four improved methods.Furthermore,the losses of both one cable and two cables were discussed.The results show that for static and dynamic analyses of the cable-stayed bridges,there is large difference between the results obtained from simulations starting with either a deformed or a nondeformed configuration at the time of cable loss.The static results are conservative in the vicinity of the ruptured cable,but the dynamic effect of the cable loss in the area farther away from the loss-cable cannot be considered.Moreover,the dynamic amplification factor of 2.0 is found to be a good estimate for static analysis procedures,since linear static and linear dynamic procedures yield approximately the same maximum vertical deflection.The results of the comprehensive evaluation of the cable failure show that the tread of the progressive failure of the cable-stayed bridges decreases when the location of the failed cables is closer to the pylon.
文摘对1起近期发生的220kV交联聚乙烯(crosslinked polyethylene,XLPE)高压电缆中间接头故障情况进行了描述。通过对故障接头进行详细解体分析,认为环氧浇注材料入网前存在缺陷可能是造成接头故障的主要原因。为避免今后发生同类事故,提出应该从严格电缆验收管理及加强电缆运行中状态检测2个方面入手,特别是应在细化干扰分析策略、丰富现场检测手段及推进测试人员专业化等方面加大力度,并重点关注开展甚高频法(very high frequency,VHF)和超高频法(ultra high frequency,UHF)联合检测。
