Seismic performance evaluation of a 34‐story steel building retrofitted with response modification elements     

Yuan‐Tao Weng  Keh‐Chyuan Tsai  Pei‐Ching Chen  Chung‐Che Chou  Ya‐Ran Chan  Sheng‐Jhih Jhuang  Yung‐Yu Wang 《地震工程与结构动力学》2009,38(6):759-781

The original structural design of this case study consisted of five basement floors and a 34‐story hotel tower in Kaohsiung, Taiwan. The construction started in 1993, and the erection of the entire steel frame and the pouring of concrete slabs up to the 26th floor were completed before 1996. However, construction of the original hotel was subsequently suspended for 10 years. Recently, this building has been retrofitted for residential purposes. Buckling restrained braces (BRBs) and eccentrically braced frames were incorporated into the seismic design of the new residential tower. This paper presents the seismic resisting structural system, seismic design criteria, full‐scale test results of one BRB member and the as‐built welded moment connections. Test results confirm that the two side web‐plate stiffening details can effectively improve the rotational capacity of welded moment connection. The paper also discusses the analytical models for simulating the experimental responses of the BRB members and the welded moment connections. Nonlinear response history analyses (NLRHA) indicate that the inelastic deformational demands of the original and the redesigned structures induced by the maximum considered earthquakes are less than those found in the seismic building codes or laboratory tests. This paper also proposes a ground motion scaling method considering multi‐mode effects for NLRHA of the example building. It is shown that the proposed scaling method worked well in reducing the scatter in estimated peak seismic demands. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Phosphorus retention and release by sediments in the eutrophic Mai Po Marshes, Hong Kong   总被引：5，自引：0，他引：5  

Lai DY  Lam KC 《Marine pollution bulletin》2008,57(6-12):349-356

This study examined the phosphorus retention and release characteristics of sediments in the eutrophic Mai Po Marshes in Hong Kong. Results of chemical fractionation show that the sum of inorganic P pools exceeded 50% of the total sediment P content, with the redox-sensitive iron-bound P (Fe(OOH) approximately P) being the dominant P fraction. Given the considerable average Fe(OOH) approximately P concentration of 912 microg g(-1), Mai Po sediments demonstrated a great potential to release bioavailable P under low sediment redox potentials. This was further supported by the high mean anaerobic P flux of 31.8 mg m(-2)d(-1) recorded in Mai Po sediment cores, indicating the role of bottom sediments as a net P source. Although sediments in Mai Po had appreciable Langmuir adsorption maxima (1642-3582 mg kg(-1)), the high zero equilibrium P concentrations (0.02-0.51 mg L(-1)) obtained suggest that sediment sorption processes would contribute to sustaining the eutrophic conditions in overlying water column even with a further reduction in external P load. Concerted efforts should be made to reduce internal loading of P, especially under reducing conditions, to complement the implementation of zero discharge policy for Deep Bay for effective eutrophication abatement and long-term water quality improvement in the Mai Po Marshes.  相似文献   

板内强震的中地壳硬夹层孕震与流体促震假设   总被引：29，自引：2，他引：27       下载免费PDF全文

车用太  刘五洲  鱼金子  王基华 《地震学报》2000,22(1):93-101

以国内外地壳流体及其与强震活动关系的最新研究结果为基础,进行了多方面的探索与论证,提出板内强震的中地壳硬夹层孕震与流体促震（BEH-PEF）的假设．该假设的要点是地壳中存在上下两大流体活动系统,其间发育有中地壳硬夹层,该层是地壳应力积累并孕育地震的层．当其中某些部位积累的应力达到屈服强度时,则进入微破裂-膨胀（扩容）阶段并形成震源体．被扩容的震源体在真空吸泵作用下,由下层流体系统把流体吸渗到其内,在震源体内引起剪切力增强与抗剪力减弱的两个过程同步发展,并最终因剪切力达到抗剪力导致震源体的破裂而发生地震．   相似文献   

地下水地表水联合模拟的解析单元法理论及应用     

易立新  王广才 《工程地质学报》2000,8(3):337-340

本文介绍了解析单元法的基本理论及适用条件 ,并运用该方法 (GFL OW1软件 )计算了某水库蓄水过程中库首结晶岩区风化裂隙水渗流场变化 ,取得良好效果.  相似文献   

Relationship between oceanic heat content and sea surface height on interannual time scale     

������  �ﳺ  ������ 《中国海洋湖沼学报》2012,30(6):1026-1032

The relationship between heat content and sea surface height (SSH) in the global ocean on the interannual time scale is examined with satellite altimeter measurements, historical hydrography, and model assimilation outputs. Results show that correlation between altimetric SSH and heat content in the upper 700 m calculated from Ishii data is geographically nonuniform. In the tropical ocean, heat content and SSH are strongly correlated and exhibit nearly the same interannual variations. In the polar ocean, their correlation is relatively weak. Further analysis with Simple Ocean Data Assimilation outputs shows that such nonuniform distribution is not from dynamical origin but from the limited integral depth selected to calculate heat content. The integral depth of 700m is inadequate to capture variation of the deep main thermocline in the polar region. The halosteric effect also contributes to the nonuniform pattern of correlation, because saline contraction becomes significant in the polar ocean owing to low temperature.  相似文献   

Steel buckling‐restrained braced frames with single and dual corner gusset connections: seismic tests and analyses     

Chung‐Che Chou  Jia‐Hau Liu  Dinh‐Hai Pham 《地震工程与结构动力学》2012,41(7):1137-1156

The design of a three‐story buckling‐restrained braced frame (BRBF) with a single‐diagonal sandwiched BRB and corner gusset was evaluated in cyclic tests of a one‐story, one‐bay BRBF subassembly and dynamic analyses of the frame subjected to earthquakes. The test focused on evaluating (1) the seismic performance of a sandwiched BRB installed in a frame, (2) the effects of free‐edge stiffeners and dual gusset configurations on the corner gusset behavior, (3) the frame and brace action forces in the corner gusset, and (4) the failure mode of the BRBF under the maximum considerable earthquake level. The subassembly frame performed well up to a drift of 2.5% with a maximum axial strain of 1.7% in the BRB. Without free‐edge stiffeners, the single corner gusset plate buckled at a significantly lower strength than that predicted by the specificationof American Institute of Steel Construction (2005). The buckling could be eliminated by using dual corner gusset plates similar in size to the single gusset plate. At low drifts, the frame action force on the corner gusset was of the same magnitude as the brace force. At high drifts, however, the frame action force significantly increased and caused weld fractures at column‐to‐gusset edges. Nonlinear time history analyses were performed on the three‐story BRBF to obtain seismic demands under both design and maximum considerable levels of earthquake loading. The analytical results confirmed that the BRB and corner gusset plate achieved peak drift under cyclic loading test. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Determination of the Interception Volume of Storm Water Based on the Contaminants Transport in Storm Sewers          下载免费PDF全文

Cuiyun Liu  Wu Che  Ben Tan 《洁净——土壤、空气、水》2015,43(11):1495-1500

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Recovery Factors of Oil Resources in China     

Liu Chenglin  Che Changbo  Zhu Jie  Yang Hulin  Fan Bojiang 《Natural Resources Research》2010,19(1):23-31

This paper provides a new method to estimate recovery factors of oil resources. The China National Petroleum Assessment (2003–2007) (CNPA 2007) evaluates in-place oil resources and applies the recovery factor (RF) to estimate recoverable oil resources. The RF of oil resources plays an important role in the CNPA 2007. Based on the geological features, 24 types of oil assessment units are defined, such as the Mesozoic rift unit, the Mesozoic and Cenozoic foreland unit, etc. Through the recovery factor statistics of oil reserves (discovered) in different accumulations, as well as the potential analyses of enhanced petroleum recovery, appropriate RF valuing standards of oil resources (discovered and undiscovered) in different assessment units are developed. Calculation methods of oil resource RFs are established, including the appraisal standards, scoring, and calculation steps of oil resource RFs. Through the case studies, the valuing and appraisal standards of oil resource RFs are verified. Robust appraisal standards allow the RF method to be a valuable tool to effective assessment of China’s recoverable oil resources.  相似文献   

关于地震地下水观测井建设的若干问题     

车用太  鱼金子  朱成英 《中国地震研究》2016,(4):612-621

根据有关的国家与地震行业技术标准,结合建井的实践经验,本文论述了地震地下水观测井的定位、观测井结构设计与钻井施工的技术要求。  相似文献   

Time-frequency response spectrum of rotationa ground motion and its application     

Wei Che  Qifeng Luo 《地震学报(英文版)》2010,(1):71-77

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