Abstract Experimental testing was performed to evaluate the redundancy of twin steel box-girder bridges under concentrated loads. Results from a series of elastic load tests, a cyclic load test, and ultimate load tests are presented. The results indicated that fracture of tension member(s) was not the immediate cause of collapse of the system. The deck and intact girder together were able to provide stability and reserve load-resisting capability for the bridge. The railings, continuity and external intermediate cross-frames were additional factors that improved the redundancy level in twin steel box-girder bridges when one girder was completed fractured.

中文翻译：

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集中荷载作用下双钢箱梁桥冗余度试验研究

摘要 对集中荷载作用下双钢箱梁桥的冗余度进行了试验测试。展示了一系列弹性负载测试、循环负载测试和极限负载测试的结果。结果表明，受拉构件的断裂不是系统崩溃的直接原因。桥面和完整的梁一起能够为桥梁提供稳定性和储备抗载能力。栏杆、连续性和外部中间横梁是提高双钢箱梁桥在一根梁完成断裂时的冗余水平的附加因素。