Simplified dynamic method for pile-driving control
Despite recent advances made in the wave-equation-based approach for pile-driving control, at the time of writing, the dynamic formulas, such as the Engineering News Record (ENR) formula and its various modified versions are still widely used. One of the major reasons for the poor performance of the dynamic formula method, besides its obvious simplifications in treating complicated wave propagation phenomenon during pile driving, is the uncertainties about the energy transferred to the pile during each hammer blow. Assuming that energy input from the pile hammer can be determined, an improved dynamic method is developed for estimation of shaft resistances and their distributions of an impact-driven pile. The method is cast within the principle of energy balance, with consideration of both elastic energy and plastic irreversible work. An incremental and forward-marching solution algorithm is developed to partially compensate for the negligence of loading/unloading behavior when complex tension and compression wave forms travel through the pile. A wave-equation-based numerical program is used in performing a series of parametric studies to identify the effect of shaft-resistance distributions and to generate engineering correlations between blow count and pile-penetration conditions (maximum pile velocity and acceleration due to each hammer impact). A simple microcomputer-based, user-friendly computer program is developed for field application. Verification of the developed method for both prototype pile driving and dynamic small-rod penetration is provided by a favorable comparison between the results of the proposed method and those calculated from the so-called CAPWAPC procedure, based on the measured high-strain test data.(Author abstract)
원문보기 무료다운로드 유료다운로드
- 원문이 없습니다.
- DOI : http://dx.doi.org/10.1061/(ASCE)0733-9410(1993)119:4(694)
- American Society of Civil Engineers : 저널> 권호
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.