CAJ | 학술논문

针对大跨多荷载桥梁疲劳损伤累积非线性过程中的大量不确定性，对火车、汽车与风荷载作用下的大跨悬索桥，利用连续损伤模型提出了一个疲劳可靠度评估方法。首先，在连续损伤模型基础上，对模型参数进行分析；然后，根据工程应用的需要，适当简化疲劳模型，在连续损伤模型中引入合适的随机变量，定义疲劳可靠度分析的极限状态函数，假定多种未来可能的交通荷载和荷载增长模式，利用蒙特卡洛方法产生随机变量并计算失效概率；最后以香港青马大桥为例，讨论了该桥在不同荷载状况下使用120年后的疲劳失效概率。研究发现：若保持当前的交通状态，桥梁可保持良好状况，但未来交通荷载的快速增长会导致结构提前失效。
침대대과다하재교량피로손상루적비선성과정중적대량불학정성，대화차、기차여풍하재작용하적대과현색교，이용련속손상모형제출료일개피로가고도평고방법。수선，재련속손상모형기출상，대모형삼수진행분석；연후，근거공정응용적수요，괄당간화피로모형，재련속손상모형중인입합괄적수궤변량，정의피로가고도분석적겁한상태함수，가정다충미래가능적교통하재화하재증장모식，이용몽특잡락방법산생수궤변량병계산실효개솔；최후이향항청마대교위례，토론료해교재불동하재상황하사용120년후적피로실효개솔。연구발현：약보지당전적교통상태，교량가보지량호상황，단미래교통하재적쾌속증장회도치결구제전실효。
Taking into account uncertainties in the nonlinear process of fatigue damage accumulation for fatigue reliability analysis of multi-loading long-span bridges,a fatigue reliability assessment method for a long suspension bridge under combined highway,railway,and wind loadings was proposed using a continuum damage model (CDM ). First,the CDM based on continuum damage mechanics was briefly introduced,and main model parameters were analyzed. Then,a simplified CDM was proposed for further application to bridge structures. A limit state function for fatigue reliability analysis based on CDM was defined by introducing proper random variables into the CDM. The Monte Carlo simulation (MCS)was adopted to generate the random variables and to calculate the failure probability. Finally, the Tsing Ma Bridge in Hong Kong was taken as a case study,and the failure probabilities of the bridge at the end of 120 years were estimated for different loading scenarios. The results indicate that the health condition of the bridge in fatigue is satisfactory under the current traffic conditions,but attentions should be paid to future traffic growth because it will largely accelerate the damage growth.