IMPACT FACTORS FOR SIMPLE-SPAN HIGHWAY GIRDER BRIDGES
IMPACT FACTORS FOR SIMPLE-SPAN HIGHWAY GIRDER BRIDGES
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DOI：
10.1061/(asce)0733-9445(1994)120:3(704
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发表时间：
1994-03-01
期刊：
影响因子：
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通讯作者：
LEE, H
中科院分区：
文献类型：
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作者：
CHANG, D;LEE, H
研究了公路简支梁桥在重载车辆作用下的振动特性。从时域和频域两个方面研究了桥梁结构的振动原因和动力特性。通过比较四种不同车辆模型的动力响应，找到了适合桥梁振动分析的车辆模型，并利用所建议的车辆模型计算了不同车速、桥面粗糙度和跨长下的冲击系数。结果与几个标准规范规定的值进行了比较，它被发现，目前的设计规范往往低估的影响因素，特别是在大跨度桥梁与粗糙的甲板。最后，经验公式的影响因素表示的跨度长度，车速和桥面表面粗糙度的建议，从多元线性回归使用本研究获得的数据。
Vibrational behavior of simple-span highway girder bridges with rough surfaces due to heavy trucks is discussed. The causes of vibration and dynamic characteristics of bridge structures are investigated in the time and frequency domains. An appropriate vehicle model for vibrational analysis of bridges is found by comparing dynamic responses from four different vehicle models, and impact factors are calculated using the suggested vehicle model with different speeds, deck roughnesses, and span lengths. The results are compared with the values specified by several standard codes, and it is found that the current design codes tend to underestimate impact factors especially in long-span bridges with rough decks. Finally, empirical formulas for impact factors represented in terms of span length, vehicle speed, and surface roughness of a bridge deck are suggested from the multiple linear regressional using the data obtained from this study.