英语翻译Forces in all 72 cables of the Luling Bridge were measur
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英语翻译
Forces in all 72 cables of the Luling Bridge were measured using a laser-based
technique.The measured cable forces were found to be below 35 percent of the
Minimum Ultimate Tensile Strength (MUTS).Judging from the relatively small
differences between measured and predicted forces and their distribution pattern,it is
unlikely that at this time,the stay cables have suffered any significant damage.Using
the finite element model of the bridge developed in this study,the source of the cable
force changes was studied.The analysis showed that the force changes could be
attributed to possible adjustments in the cable tension forces at the last stages of
construction for deck geometry compliance,or the effect of additional dead load.
These inferences were in agreement with the result of a deck profile survey conducted
by LADOTD.Cable damping measurements conducted by CTL indicate that most of
the cables of the Luling Bridge have very low damping and are vulnerable to rainwind
induced and other wind-induced vibrations.
Forces in all 72 cables of the Luling Bridge were measured using a laser-based
technique.The measured cable forces were found to be below 35 percent of the
Minimum Ultimate Tensile Strength (MUTS).Judging from the relatively small
differences between measured and predicted forces and their distribution pattern,it is
unlikely that at this time,the stay cables have suffered any significant damage.Using
the finite element model of the bridge developed in this study,the source of the cable
force changes was studied.The analysis showed that the force changes could be
attributed to possible adjustments in the cable tension forces at the last stages of
construction for deck geometry compliance,or the effect of additional dead load.
These inferences were in agreement with the result of a deck profile survey conducted
by LADOTD.Cable damping measurements conducted by CTL indicate that most of
the cables of the Luling Bridge have very low damping and are vulnerable to rainwind
induced and other wind-induced vibrations.
在测量庐陵桥上的72根钢缆承载负荷过程中,使用了基于激光的技术.发现测量到的钢缆所受的力低于最小极限张力的35%.从测量的数值与预测承受力之间相对较小的差距以及相关力的分解模式判断,此时斜缆不可能受到很大程度的损坏.利用在本次研究中开发的该桥的有限要素模型,加载在钢缆上的力发生变化的根源得到了细致的研究.分析表明加载力发生变化的原因可以归咎于在施工最后阶段钢缆承受的张力为适应桥面几何特性而作的调整,或是有另外的静负荷.这些推断与由LADOTD进行的桥面断面勘察的结果相符.CTL承担的钢缆阻尼测量表明庐陵桥的大多数钢缆具有非常低的阻尼系数,因此它对于雨或风引起的以及其它由风引起的震动很敏感,结果桥本身变得很脆弱.
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