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。
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.