新西兰北地理工学院论文代写：桥梁结构
新西兰北地理工学院论文代写：桥梁结构
这座桥有足够的张力刚度的甲板，使其不需要任何抗风结构。这座桥的横向刚度与一座类似跨度的桥相当。为了增加桥梁的扭转刚度，电缆被设置在规划和超出甲板。该桥的桥面结构将有助于系统的额外刚度，同时吸引显着的寄生力在甲板成员由于电缆运动。这座桥的桥面出现在桥的南端。这有助于保持从电缆到桥面的支撑。
开幕当天的失败
这座桥在开业那天就失败了。这是因为在同一天，约80000至100000人过桥，从视频画面中发现，在任何时间，有2000人，这导致最大密度为1.3或每平方米的人。这人群导致意想不到的横向振动的桥梁。这种运动主要发生在南半球，有大约0.8赫兹的频率，在中心跨度的频率为0.5赫兹和1赫兹。在北跨度的运动并没有发生在所有。过度振动的数量没有连续地发生，但突然发生在人群的影响跨度的桥梁。
通过目测，发现最大的横向加速度经历200 – 250毫克南和桥主跨。在这个桥的南部和中部的加速度水平上，人们开始在桥上行走变得困难。
新西兰北地理工学院论文代写：桥梁结构
This bridge has sufficient tension stiffness for the deck so that it does not need any wind resisting structure. The lateral stiffness of this bridge is same as a foot bridge of similar span. In order to increase the torsional stiffness of the bridge, the cables are set wide apart in plan and well beyond the deck. The deck structure for this bridge will contribute little extra stiffness to the system whilst attracting significant parasitic forces in the deck members due to the cable movements. The deck of this bridge bifurcates at the south end of the bridge. This helps in maintaining the support from the cables to the deck of the bridge.
Opening Day Failure
The bridge failed on the day of opening. This happened because on the same day about 80,000 to 100,000 people crossed the bridge and from the video footage it was found that at any point of time there were 2000 people, which resulted a maximum density of 1.3 or 1.5 people per square meter. This crowd resulted in unexpected lateral vibrations to the bridge. This movement took place mainly at the south span, there was frequency of around 0.8 Hz and at the central span the frequencies were 0.5 Hz and 1.0 Hz. On the North span the movement did not occur at all. The number of excessive vibrations did not occur continuously but it happened suddenly as soon the crowds were on the affected spans of the bridge.
Through visual estimation, it was found that the maximum lateral acceleration experienced as 200 – 250 milli -g on south and central span of the bridge. At this level of acceleration at the south and central span of the bridge, the people started getting difficulty in walking over the bridge.
