| 2 | 采用楔形构件框架的塑性分析(英文)显示文摘对一些平面内楔形截面构件进行二阶简单塑性铰法分析,并利用有限元法及重叠原理推导I形钢楔形截面构件的刚度矩阵。为预测构件内部可能形成塑性铰的位置,以一个同时受弯矩及轴力作用的梁柱单元,仿真各种不同边界条件的楔形截面构件。若预测构件内会形成塑性铰的位置则要增设一个节点,将一个构件分割为两个单元,以获得最合理的荷载-挠度曲线。楔形截面构件的刚度矩阵应特别注意方向性的问题。若没有考虑到任一构件中可能形成塑性铰的位置,就不能准确地预测梁柱真实的极限承载能力。若仅用一个单元代表一个楔形截面构件就会高估极限承载能力。该方法可合理地应用于具有楔形截面构件框架的塑性分析。 | W.S.King C.J.Chen L.Duan W.F.Chen | 2006 | 建筑科学与工程学报2006，23，2： | 1 |
| 3 | Applicability of large-ion lithophile and high field strength element basalt discrimination diagrams显示文摘Basalt discriminant diagrams have been used to identify the tectonic setting of basaltic magmatism since the 1970s and have played an important role in reconstructing paleotectonic environments.However,the significant increase in the availability of geochemical data has led to a reassessment of these diagrams,suggesting that some of the tectonic settings indicated by these diagrams are not accurate.Here,we use a database of global ocean island basalt(OIB),mid-ocean ridge basalt(MORB),and island arc basalt(IAB)geochemistry to propose a series of new tectonic discriminant diagrams based on the ratios of large-ion lithophile elements(LILEs)to high field strength elements(HFSEs).These new diagrams indicate that the LILE can be used to differentiate OIB,MORB,and IAB samples,meaning that LILE/HFSE ratios can discriminate between these basalts that form in different tectonic settings.Our new diagrams can correctly assign samples to OIB,MORB,and IAB categories more than 85%of the time,with the discrimination between OIB and MORB having an accuracy of slightly less than 85%. | X.L.Liu Q.Zhang W.C.Li F.C.Yang Y.Zhao Z.Li S.T.Jiao J.R.Wang N.Zhang S.S.Wang W.F.Chen Z.J.Pan J.Yang X.L.Du | 2018 | International Journal of Digital Earth2018，11，7： | 0 |
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