木虫 (正式写手)
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三如居士(金币+5, 翻译EPI+1): 2010-05-26 11:24:08
Abstract
Bridge structure is the traffic network is an important part of understanding the process of bridge earthquake seismic performance is extremely important. Especially after the earthquake disaster relief, the bridge is the lifeline of the key aspects of emergency capacity. Although damage to other bridge components may bring economic losses and safety threats, and reinforced concrete piers of the bridge structure is usually the most easily damaged components, pier damage may lead to disastrous consequences.
Bridge damage in recent decades has promoted the rapid development of bridge seismic technology, the world's leading bridge seismic design specification has been adopted ductility, performance-based seismic design method of a current research focus and development trends. On the nonlinear seismic response of bridge piers, failure mechanism of in-depth understanding and grasp of the bridge design of the key state.
Purpose of this paper is in reinforced concrete bridge piers under earthquake seismic performance of ductile failure mechanism of the system, in-depth research, to ensure the seismic safety of our bridge to provide the necessary experimental basis and theoretical basis, and specification of bridge seismic provide important support for the revision. Firstly, a broad, in-depth literature research, based initially determined the factors that affect the ductility of bridge piers; followed by quasi-static orthogonal pier on the pier ductility factors affecting validation and correlation analysis, and then determine the impact of the equivalent plastic hinge length and the equivalent stiffness factor; then, for the internal reinforcement, and combined with the existing experimental research and the United States, Japan, pier performance database test data, return the equivalent plastic hinge length of the pier and the equivalent stiffness of the formula; final establish the corresponding OpenSees numerical model, the plastic hinge on the proposed pier length and equivalent stiffness of the numerical calculation on the validation. Thesis work, knowledge and the results (conclusions) are as follows:
(1) research-based literature, from the geometric characteristics, reinforcement situation, the role of material properties and load summarizes the factors that affect the ductility of bridge piers;
(2) for a more systematic three-level, four factors (height of piers L, axial load ratio P / Ag fc ', longitudinal reinforcement diameter db, hoop ρh) pier to be static orthogonal design and experimental studies;
(3) from the pier strength properties, ductility and other capabilities to evaluate the test results, and systematic analysis of the shear span ratio, axial compression ratio and the rate of longitudinal reinforcement on the seismic behavior of bridge piers, ductile failure mechanism;
(4) impact factor analysis based on the proposed plastic hinge length of reinforced concrete bridge piers and the equivalent stiffness of the whole formula;
(5) the establishment of an effective static test OpenSees pier numerical model, from the numerical validation of the proposed plastic hinge length and the equivalent stiffness of the overall reliability of the formula. |
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