Comparison between Paleozoic and Cenozoic Lithospheric Mantle in Eastern Part of North China Block: With a Discussion of Mantle Evolution     

Zheng Jianping  Lu Fengxiang  O''''Reilly S.Y.  Griffin W.L.  Zhang Ming 《中国地质大学学报(英文版)》1999,10(3):207-214

Basedontheconsiderationswhetherornottherearedif-ferencesincompositionsofthemantlematerial,betweenPale-ozoicandCenozoic,andthedifferencesinrocksamp1esfrommantleliewithinandoutsideoftheTancheng-Lujiang(Tanlu)faultzoneinCenozoic,themineralinclusionsindia-mQndandxenolithsfromMengyinandFuxiankimberliteswerechosenforconstrainingthenatureofPaleozoicSCLM,andthexenolithsfromtheShanwangandQixiabasaltswererepresentativelychosenforconstrainingthenatureofCeno-zoicSCLMinsideandoutsideoftheTanlufault…  相似文献   

昆明长水国际机场航站楼隔震橡胶支座更换技术          下载免费PDF全文

阿拉塔    宋廷苏    安晓文 《世界地震工程》2019,35(4):199-209

本文介绍了昆明长水国际机场航站楼1m直径隔震橡胶支座的更换技术。针对机场航站楼隔震承台轴力不同,隔震橡胶支座自重大,人工无法移动,且隔震层上下承台之间距离小等实际情况,定制了特殊的柴油机械传动叉车和液压千斤顶。更换支座的上承台顶升与周边上承台的顶升采用异步顶升方法。本文介绍了异步顶升方法千斤顶的布置和上承台顶升位移限值的确定方法。通过现场测量上法兰板螺栓孔在下法兰板投影的位置,按照投影位置加工上法兰板螺栓孔的方法,解决了由于隔震支座发生水平剪切变形使上下法兰板孔竖向不对齐的问题。通过两个措施大大减小了上承台顶升高度:（1）提前施加压力,减小了新支座的高度;（2）把旧隔震支座上下法兰板连接起来,阻止了支座竖向压缩变形的恢复。该技术成功应用于昆明长水国际机场42个侧鼓变形隔震橡胶支座的更换。该技术简单、经济、可行,可为其他工程隔震橡胶支座更换提供借鉴,为相关规范标准的制定提供参考。  相似文献   

Hanger replacement influence on seismic response of suspension bridges: Implementation to the Bosphorus Bridge subjected to multi-support excitation     

Selcuk Bas  Chuan-Zhi Dong  Nurdan M. Apaydin  Alper Ilki  F. Necati Catbas 《地震工程与结构动力学》2020,49(14):1496-1518

The effects of hanger replacement from inclined to vertical configuration on seismic response of long-span suspension bridges are investigated considering multi-support earthquake excitation. The Bosphorus Bridge is investigated due to its recent comprehensive rehabilitation, mainly involving hanger replacement. The finite-fault stochastic simulation method (FINSIM) is utilized for multi-point earthquake time-history generation. The developed finite element (FE) model both for the inclined and vertical hanger arrangement are verified through the structural health monitoring (SHM) data. Based on the comparative analysis, the tension force of vertical hangers is found to be lower than that of inclined hangers, whereas the tension force of the main and back-stay cables remains the same. The compressive axial force of the deck decreases relatively in the case of the vertical hanger arrangement, whereas the cross-sectional forces at the tower base section increase. The approach viaducts are not affected by the vertical hanger arrangement. According to the demand/capacity ratios for damage estimation under the max. earthquake (2475 years return period), structural damage on the tower base section may be expected for both hanger arrangements, while these sections perform well under design scenario earthquake. The expansion joint of the bridge with inclined hangers is also estimated to be damaged; however, this displacement is lower in the case of the vertical hanger arrangement due to the viscous dampers. The findings also reveal that a change in hanger form of a suspension bridge can necessitate other structural retrofit, such as using viscous dampers to limit longitudinal displacements of the deck and retrofitting the bridge towers.  相似文献