Research on Construction Process Monitoring of Single-Layer Curved Steel Reticulated Shell Supported by Forked Columns
Taking the single-layer curved reticulated shell of Honghe integrated transportation hub in Yunnan as the background,the key rods of the reticulated shell structure and lifting tower are monitored during the construction process and the internal force changes of the structure during the ground assembly and overall lifting are analyzed.The temperature effect of reticulated shell structure in the construction process is studied,and the influence of boundary constraint strength on the structural temperature stress is discussed.After the reticulated shell is installed,the stress change caused by temperature change of 1℃increases about 3 times that before the reticulated shell is installed.After installation,when the temperature changes by 1℃,the stress change of the reticulated shell away from the bearing bar is twice as much as that near the bearing.According to the analysis of the monitoring data in the lifting stage,the measured stress fluctuating in the lifting process is less than 10 MPa,and the lifting synchronization of the lifting point is good.In addition,the monitoring data of the reticulated shell structure at unloading stage are analyzed.The lifting state of the reticulated shell is basically the same as that in service state,and the stress difference of the reticulated shell before and after unloading is small.After unloading,the support structure is also highly sensitive to temperature.
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