Pseudo‐dynamic tests of a full‐scale CFT/BRB frame—Part I: Specimen design,experiment and analysis

A series of pseudo‐dynamic tests (PDTs) of a full‐scale 3‐story 3‐bay buckling‐restrained braced frame (BRBF) using concrete‐filled tube columns was tested in the Taiwan National Center for Research on Earthquake Engineering using networked PDT techniques in October 2003. During the tests, real‐time experimental responses and video were webcasted to Internet viewers. The input ground motions adopted for the PDTs were chosen from the 1999 Chi‐Chi and the 1989 Loma Prieta earthquakes and scaled to represent three seismic hazard levels. This paper is in two parts, focusing on the investigations of the overall structure and the local members. This paper constitutes Part I and discusses the design, analytical investigations, and key experimental results of the specimen frame, such as the buckling of the brace‐to‐gusset joints. Part II of the paper, the companion paper, describes the gusset stiffening schemes and detailed experimental behavior of the BRBs and their connections. Experimental peak inter‐story drifts of 0.019 and 0.023 radians, prescribed for the design basis and the maximum credible earthquakes, respectively, are within the target design limits of 0.020 and 0.025 radians. These tests confirmed that the PISA3D and OpenSees nonlinear structural analysis computer programs can simulate the experimental peak shears and floor displacements well. Copyright © 2008 John Wiley & Sons, Ltd.     

Flow Deflection in Intersected Tubes

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｈｅｏｒｅｔｉｃａｌｃａｌｃｕｌａｔｉｏｎｓｏｆｗａｔｅｒｍｉｇｒａｔｉｏｎ ,ｗｈｅｔｈｅｒｉｎａｎｉｎｄｉｖｉｄｕａｌｆｒａｃｔｕｒｅｏｒｉｎａｆｉｓｓｕｒｅｎｅｔｗｏｒｋ ,ｈａｖｅａｌｌｂｅｅｎｂａｓｅｄｏｎｔｈｅｅｑｕａｔｉｏｎｆｏｒｖｉｓｃｏｕｓｆｌｏｗｂｅｔｗｅｅｎｐａｒａｌｌｅｌｐｌａｔｅｓ.ＷｉｌｓｏｎａｎｄＷｉｔｈｅｒ ｓｐｏｏｎ (1976 )ｆｉｒｓｔａｃｃｏｍｐｌｉｓｈｅｄａｈｙｄｒａｕｌｉｃｓｉｍｕｌａｔｉｏｎｏｆｆｒａｃｔｕｒｅｗａｔｅｒｃｒｏｓｓ…     

方钢管混凝土柱的延性系数

在空钢管中填充混凝土可以避免或延缓钢管早地发生局部屈曲,可以有效地提高构件的延性,从而增强构件的抗震性能,本文研究钢管混凝土桩的延性性能,本文首先提出方钢管混凝土柱延性系数的计算方法,然后,在大规模参数分析结构的基础上,考察了轴压比,长细比,含钢率,钢材屈服极限和混凝土抗压强度等参数对延性系数的影响规律,本文的研究成果可供有关工程实践参考。     

Vortex Motion of the Crust Deformation in the Tibetan Plateau and Its Foreland

VORTEX MOTION OF THE CRUST DEFORMATION IN THE TIBETAN PLATEAU AND ITS FORELANDFromtheresultsofthecooperativeprojectbetweenChengduInstituteofGeologyandMineralResources andMassachusettsInstituteofTechnology     

CCD˫�������ǵ����Ƽ�Ӧ��

?????????????????????????????????????????????????????????????????λ??????????С????н?????????????????????????????Ч?????á?     

微孔管增氧和气石增氧对凡纳滨对虾室内养殖影响的比较研究

在凡纳滨对虾室内养殖池底部分别铺设微孔管和安装气石,在供氧功率相同的情况下比较微孔管增氧与气石增氧对凡纳滨对虾室内养殖产生的影响.研究表明:在养殖中后期微孔管增氧组的水温低于气石增氧组;从养殖60 d左右到养殖结束微孔管增氧效果明显优于气石增氧;亚硝酸氮、氨氮、非离子氨氮、无机磷与COD含量在2种增氧条件下没有显著性差异(P＞0.05);凡纳滨对虾体重变化、最终产量与成活率在2种增氧条件下没有显著性差异(P＞0.05);凡纳滨对虾血清溶菌酶活力、过氧化物酶相对活力、抗菌酶活力在微孔管增氧条件下较高并达到了显著性差异(P＜0.05);超氧化物歧化酶活力则在气石增氧条件下较高且达到显著性差异(P＜0.05);酚氧化酶活力在2种增氧条件下不存在显著性差异(P＞0.05).     

常熟地震台数字水管倾斜仪观测资料质量分析

通过对常熟台DSQ水管仪2008-2011年倾斜潮汐观测资料的质量分析得出:DSQ水管仪工作稳定,观测资料的质量达到了形变规范的要求.     

管形构件结构地磁相对记录室建设

以宝坻新台为例,介绍管形构件结构地磁相对记录室的方案设计和施工要点,分析采用玻璃钢管形构件建设的地磁相对记录室的实际效果,得出玻璃钢管形构件结构方案是值得推广的一种地磁相对记录室结构新方案的结论。     

数据表象特征在仪器维护中的应用

针对地震台站使用的DSQ型水管倾斜仪,对仪器因环境变化、系统故障等原因引起的数据异常表象形态及原因进行剖析总结,提出了观测数据典型异常现象及故障的判定方法和检查思路,对台站做好观测仪器的日常维护维修具有一定的参考意义。     

钢管混凝土组合柱在标准火与真实火中的行为比较

以实际工程中常用的钢管混凝土组合柱为研究对象,通过ABAQU S大型有限元软件模拟钢管混凝土组合柱在标准火和真实火中的截面温度分布、应力、变形、破坏形态、耐火极限等力学行为。其中标准火选用ISO-834标准火模型,真实火采用欧洲规范Eurocode 1 Part 1-2中的参数火模型来近似模拟真实火灾的温度—时间关系。研究发现,钢管混凝土柱在两种火场环境中的行为差异很大,真实火中的冷却过程对钢管混凝土的破坏起重要的影响。基于本研究,还初步得到火灾过程中环境温度的升温速度、柱火灾荷载比等对钢管混凝土组合柱的抗火性能的影响。