[雙語翻譯]--港航碼頭設(shè)計外文翻譯--長灘港高樁碼頭的的抗震設(shè)計標(biāo)準(zhǔn)（譯文）

1、TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment ©2009 ASCE 909TCLEE 20091Seismic Design Criteria for Pile-Supported Wharves at the Port of Long BeachCheng Lai1, S.E., M. ASCE, Omar A. Jarada

2、t2, Ph.D., P.E., M. ASCE, Max Weismair3, S.E., and (Arul) K. Arulmoli4, Ph.D., G.E., F. ASCE1Senior Structural Engineer, Port of Long Beach, 925 Harbor Plaza, Long Beach, CA 90802, lai@polb.com, 2Senior Project Manager,

3、 Moffatt new details and practices for the design and construction of wharves were developed and followed by new codes and guidelines for port structures. This work, however, was driven by different authorities, often

4、 not closely coordinated: Code Writing Authorities, Owners (Ports), and Consultants. As a result of the rapid development in this field, the resulting documents for the seismic design of wharves made their interpretat

5、ion sometimes difficult.POLB recognized the need for uniform and port-specific guidelines and developed port specific Wharf Design Criteria. This paper specifically addresses the Seismic Design Criteria. They include G

6、round Motions and Performance Criteria, Geotechnical Considerations with particular attention to soil-structure interaction, Structural Design and Analysis Methods, and Seismic Detailing. These subjects are specifical

7、ly adjusted for site-specific conditions in POLB, such as seismicity, foundation soils, construction practices and the requirements of the Port’s Engineering Bureau, which had an important function in the development

8、of the criteria.All seismic design and analysis procedures are based on displacement-based procedures. The development of the criteria was reviewed at various stages by experts in structural, geotechnical, and earthqua

9、ke engineering disciplines. An experimental program verified the analytical assumptions. POLB’s recent wharf construction experience confirmed the practicality of the construction details. It is anticipated that these

10、Criteria will provide more uniformity, focus on design, quality assurance, and minimize construction costs, while providing better coordination between POLB’s engineering staff and consultants.Downloaded from ascelibra

11、ry.org by Changsha University of Science and Technology on 01/14/15. Copyright ASCE. For personal use only; all rights reserved.TCLEE 2009TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment ©200

12、9 ASCE 9113Mechanics, Inc. and P2S Engineering, Inc. The expert review team included Dr. Nigel Priestley, Emeritus Professor, Department of Structural Engineering, University of California, San Diego and Dr. Geoffrey M

13、artin, Professor, Department of Civil Engineering, University of Southern California.Wharf Design CriteriaThe POLB WDC document consists of six sections covering four different aspects of wharf design including: Geotec

14、hnical, Structural, Seismic and Electrical. This paper covers the WDC seismic design aspects. The WDC utilizes displacement-based design methodology and uses state-of-the-art information available in the areas of geolo

15、gy, seismology, geotechnical engineering, structural engineering, and seismic design. Three- level seismic hazard evaluation criteria are utilized that allow the assessment of seismic risks in a practical way.The deve

16、lopment of seismic design criteria in the recent past was driven by different authorities, often not closely coordinated: Code Writing Authorities, Owners (Ports), and Consultants. As a result of the rapid development

17、in this field, the resulting documents for the seismic design of wharves made their interpretation sometimes difficult. The Long Beach Municipal Code requires a Building Permit from the Department of Development Servi

18、ces for the construction of wharf structures at the POLB. The Department of Development Services enforces the California Building Code (CBC) (Ref. 3) that uses force based design approach. The WDC will help to streamli

19、ne the wharf construction permit process with the Department of Development Services.The seismic design criteria apply to the design of a new wharf as a ductile frame system of vertical piles supporting a concrete deck

20、. Three earthquake levels are considered: the Operational Level Earthquake (OLE), the Contingency Level Earthquake (CLE), and the Code-Level Design Earthquake (DE). These three earthquake levels correspond to differen

21、t probabilities and return periods, and are related to different levels of performance criteria. The acceptable level of structural damage is controlled by concrete, steel and strand strain limits in the piles.The OLE

22、has a probability of exceedance of 50% in 50 years. The wharves should remain operational. Minor damage, such as some cracking is permitted, but no spalling of the pile cover concrete at the OLE. For the CLE, which has

23、 a probability of exceedance of 10% in 50 years, the wharves may become temporarily non-operational, but the damage must be repairable within a reasonable amount of time. The DE corresponds to a larger and rare earthq

24、uake than the OLE and CLE. The DE seismic hazard criteria require that the wharves must not collapse and must not compromise life safety, as defined per ASCE Standard 7-05 (ASCE, 2006).Acceptable analytical methods for

25、 wharf seismic design include modal response spectrum analysis, single mode transverse analysis, substitute structure analysis, and nonlinear time-history analysis. Expected material properties are defined for determin

26、ing pile stiffness, and general analysis procedures are described. Geotechnical issues such as soil- structure interaction and liquefaction shall be considered in the design. The criteria also define two separate load

27、ing conditions to capture the effects of soil-structure interaction.Downloaded from ascelibrary.org by Changsha University of Science and Technology on 01/14/15. Copyright ASCE. For personal use only; all rights reserve