A nonlinear dynamic macro-element for demand assessment of bridge substructures subjected to ship collision  

作　　者：Wei FAN Wan-cheng YUAN Mi ZHOU 

机构地区：[1]IState Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China [2]2Department of Civil Engineering, Purdue University, West Lafayette 47907, USA [3]Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation, Chang＇an University, Xi ＇an 710064, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2011年第11期826-836,共11页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the Ministry of Science and Technology of China (No. SLDRCE 09-B-08);the National Natural Science Foundation of China (Nos. 50978194 and 90915011);the Kwang-Hua Fund for College of Civil Engineering,Tongji University;the Fund of National Engineering and Research Center for Highways in Mountain Area (No. gsgzj-2010-01),China

摘　　要：For the dynamic demand assessment of bridge structures under ship impact loading,it may be prudent to adopt analytical models which permit rapid analysis with reasonable accuracy.Herein,a nonlinear dynamic macro-element is proposed and implemented to quantify the demand of bridge substructures subjected to ship collisions.In the proposed nonlinear macro-element,a combination of an elastic-plastic spring and a dashpot in parallel is employed to describe the mechanical behavior of ship-bows with strain rate effects.Based on the analytical model using the proposed macro-element,a typical substructure under 5000 deadweight tonnage(DWT) ship collision is discussed.Our analyses indicate that the responses of the structure using the nonlinear macro-element agree with the results from the high resolution model,but the efficiency and feasibility of the proposed method increase significantly in practical applications.Furthermore,comparisons between some current design codes(AASHTO,JTGD60-2004,and TB10002.1-2005) and the developed dynamic analysis method suggest that these design codes may be improved,at least to consider the effect of dynamic amplification on structural demand.For the dynamic demand assessment of bridge structures under ship impact loading, it may be prudent to adopt analytical models which permit rapid analysis with reasonable accuracy. Herein, a nonlinear dynamic macro-element is proposed and implemented to quantify the demand of bridge substructures subjected to ship collisions. In the proposed nonlinear macro-element, a combination of an elastic-plastic spring and a dashpot in parallel is employed to describe the mechanical beha- vior of ship-bows with strain rate effects. Based on the analytical model using the proposed macro-element, a typical substructure under 5000 deadweight tonnage （DWT） ship collision is discussed. Our analyses indicate that the responses of the structure using the nonlinear macro-element agree with the results from the high resolution model, but the efficiency and feasibility of the proposed method increase significantly in practical applications. Furthermore, comparisons between some current design codes （AASHTO, JTGD60-2004, and TB 10002.1-2005） and the developed dynamic analysis method suggest that these design codes may be improved, at least to consider the effect of dynamic amplification on structural demand.

关 键 词：Nonlinear macro-element Ship-bridge collision P-a curve Dynamic demand Design codes 

分 类 号：U44[建筑科学—桥梁与隧道工程] U66[交通运输工程—道路与铁道工程]