Systematic assessment of irregular building–soil interaction using efficient modal analysis

In this paper an efficient methodology applying modal analysis is developed to assess systematically the combined soil–structure interaction and torsional coupling effects on asymmetric buildings. This method is implemented in the frequency domain to accurately incorporate the frequency‐dependent foundation impedance functions. For extensively extracting the soil–structure interaction effects, a diagonal transfer matrix in the modal space is derived. A comprehensive investigation of asymmetric building–soil interaction can then be conveniently conducted by examining various types of response quantities. Results of parametric study show that the increasing height‐to‐base ratio of a structure generally amplifies its translational and torsional responses. Moreover, both the translational and torsional responses are reduced for the case where the two resonant frequencies are well separated and this reduction is enhanced with the decreasing values of the relative soil stiffness and the height‐to‐base ratio. The most noteworthy phenomenon may be the fact that the SSI effects can enlarge the translational response if the structure is slender and the two resonant frequencies are very close. Copyright © 2001 John Wiley & Sons, Ltd.     

估算天然气成熟度的新指标--金刚烷指标

采用天然气重烃富集及MID/GC/MS分析技术,从天然气中检测出单、双金刚烷类化合物。根据琼东南盆地生油岩中金刚烷指标 (Ⅱ )与镜煤反射率 (Ro)的实测值,结合应用塔里木盆地、鄂尔多斯盆地的上述实测数据点,建立了双金刚烷指标与镜煤反射率 (Ro)数值对应关系。根据这种关系成功地确定和研究了莺-琼盆地三个构造天然气的成熟度。研究成果不仅提供了检测天然气中金刚烷类化合物的方法,扩大了金刚烷类化合物的应用范围,而且表明金刚烷类化合物是研究天然气成熟度的一个有效指标     

黄骅盆地奥陶系古岩溶特征、演化及其对潜山油气聚集的控制作用

按照岩溶化特点,黄骅盆地奥陶系碳酸盐岩古岩溶可分为三种不同的类型:由大气水溶解形成的岩溶、有机酸溶蚀古岩溶及埋藏热液古岩溶。其中,控制古生界碳酸盐岩储层物性的大气水岩溶对潜山油气聚集起着显著的作用,它的形成与黄骅盆地演化过程中三期(加里东、印支—燕山及喜马拉雅期)重要的碳酸盐岩暴露事件有关。这三期与古抬升相关的岩溶作用相互叠置在一起形成古岩溶复合系统,在黄骅盆地中,由加里东、印支—燕山期岩溶叠置的古岩溶复合体拥有较多的有效孔隙及缝洞,有利于油气的储集,是黄骅盆地中最好的碳酸盐岩储层。同时,古岩溶复合体的形成时间对潜山油气运聚起着决定性作用,发育于中新生代的大气水岩溶是“新生古储”油气聚集的有利因素,但对古生界原生油气聚集不利。加里东期岩溶、埋藏热液古岩溶及有机酸溶蚀古岩溶则对古生界原生油气聚集有利。     

切变基流中赤道Rossby包络孤立波(英文)

利用一个简单的赤道β平面浅水模式和多尺度摄动法，从描写赤道Ｒｏｓｓｂｙ波的正压大气位涡度方程中推导出在切变基本维向流中赤道Ｒｏｓｓｂｙ波包演变所满足的非线性Ｓｃｈｒｏｄｉｎｇｅｒ方程，并得到其单个包络孤立波子波解，并分析基本流切变对非线性赤道Ｒｏｓｓｂｙ孤立子的影响。     

稀性泥石流对排导槽的冲磨破坏机理

针对稀性泥石流特点，从垂直于排导槽边壁方向和平行于排导槽边壁方向对排导槽的受力情况进行比较深入的分析，导出了多个公式，为设计排导槽提供了理论依据。     

福建省上地幔结构与岩石矿物的基本特征

综合研究了福建省上地幔的矿物、岩石、地球化学、地球物理（重、震、电）等有关资料，全面论证上地幔B′与B″层的三维空间特征、可疑地幔岩性、古代与现代地幔岩岩石类型与矿物成分。继而从地幔岩矿物组合，化学成分、微观特征、包裹体、稳定同位素等特点，来探讨第三纪上地幔的成岩环境与动力学，并指出东南沿海岩石圈上地幔减薄斜坡带及其叠生的深切断裂是燕山期双系列岩浆岩形成的深部地质背景。     

Regularity of paleowind directions of the Early Cretaceous Desert in Ordos Basin and climatic significance

By the measurement of the wind directional indicator of the Cretaceous desert in Ordos Basin, the regularity of the paleoprevailing wind directions and pattern of the paleowind belts are revealed. It is considered that the desert was controlled by a planetary wind system. In the early stage, the subtropical high pressure zone drifted south and northwards with short cycles, resulting in the alternation of westerlies and northeast trades; in the late stage, the subtropical high pressure zone drifted southwards with a long cycle, placing the desert under the westerly belt and making the desert completely controlled by the westerly belt. The reconstruction of the paleowind belts has provided the evidence of the general circulation of the atmosphere for the pattern of the circulation before the uplift of the Tibetan Plateau     

邢台地震的震后异常分析

对１９６６年３月８日邢台６．８级地震后的异常进行了逐项分析与讨论，发现有些震后异常与后续７．２级主震有比较可信的内在联系。本文在归纳邢台震后异常特征的基础上，提出了６条可能在同类条件下对预报后续地震具有普遍意义的意见。     

地震灾害快速评估的计算机方法和程序

文中介绍一种在微机上实现的地震灾害快速评估应用软件：ＤＩＳＥＶ，ＤＩＳＥＶ由地震输入系统，图形显示系统，灾害评估系统和数据输出系统等４部分组成，采用确定性的地震灾害评估方法，用Ｃ语言设计完成，ＤＩＳＥＶ操作简单，快速，对震后快速反应工作以及救灾工作有重要意义。     

Boundary element method with exterior collocation in two-dimensional elastodynamic problems

In the present paper, the boundary element method with exterior collocation was applied to two-dimensional elastodynamic problems. The stability of the numerical solution was discussed and the collocation rule of source points outside the region being studied was investigated in the frequency domain by means of the computed error in the boundary displacement and the condition number of the coefficient matrix for two typical wave propagation problems. The achieved results are helpful to the practical application of this method to earthquake ground motion analysis.