CAJ | 학술논문

为研究特重车交通荷载工况作用下大跨拱桥的动力响应特点，以河北省宣大高速公路上某大桥的动态称重系统所采集的近3年的交通数据为基础，定义并提取了特重车的交通荷载工况，进而分析了不同类型特重车交通荷载工况所占比例及每个特重车交通荷载工况车辆总质量的分布规律。利用随机车流-桥梁耦合振动分析软件计算了大跨拱桥在特重车交通荷载作用下的空间动力响应，并与新旧桥梁规范中的设计车辆荷载对应的响应进行了对比。结果表明：新规范对拱桥关键部位的设计荷载定义更为保守，实测的交通荷载工况中仅有极少数特重车交通荷载工况对应的响应超过了设计车辆荷载对应的响应；对于该大跨拱桥，新桥梁规范中的设计车辆荷载能够较充分地考虑大部分特重车交通荷载作用对桥梁结构整体受力产生的不利影响。
위연구특중차교통하재공황작용하대과공교적동력향응특점，이하북성선대고속공로상모대교적동태칭중계통소채집적근3년적교통수거위기출，정의병제취료특중차적교통하재공황，진이분석료불동류형특중차교통하재공황소점비례급매개특중차교통하재공황차량총질량적분포규률。이용수궤차류-교량우합진동분석연건계산료대과공교재특중차교통하재작용하적공간동력향응，병여신구교량규범중적설계차량하재대응적향응진행료대비。결과표명：신규범대공교관건부위적설계하재정의경위보수，실측적교통하재공황중부유겁소수특중차교통하재공황대응적향응초과료설계차량하재대응적향응；대우해대과공교，신교량규범중적설계차량하재능구교충분지고필대부분특중차교통하재작용대교량결구정체수력산생적불리영향。
Authors investigated the characteristics of the spatial dynamic response of an long-span arch bridge using the random traffic-bridge coupling vibration analysis software based on realistic extra-heavy truck load data recorded by the weigh-in-motion (WIM ) system . A set of WIM system was installed on a bridge located in the highway from Xuanhua to Datong , Hebei Province .The extra-heavy truck load cases were defined and extracted using traffic load data in last three years acquainted by the system ,then the proportions of different types and the vehicle weight distributions of the extra-heavy truck cases were analyzed ,and the structure response was compared with that under the design specification load .The spatial dynamic response of long-span arch bridge under the extra-heavy truck cases was analyzed using the random traffic-bridge coupling vibration analysis software ,and the structure response was compared with that under the design vehicle load in old and current bridge codes .The results show that only few extra-heavy truck cases result in larger response than those under design specification vehicle load , implying that the designed load specified in the code can take into account of most critical traffic cases for the studied long-span arch bridge .