Experimental Research And Numerical Analysis For The Huge Steel Truss With Large Span During Construction Process

Construction technology is the key problem to spatial steel truss with huge-span during construction process . The spatial structure will create initial stress injuries and result in serious risk because of selecting an unreasonable construction program. So, the reasonable construction program and scientific analysis should be selected to ensure the safety for the spatial structure.In this paper, the stress distribution and displacement of the spatial steel truss member named International Gansu Convention and Exhibition Center are summarized during the construction process were researched with the method combined with numerical analysis and experimental study. The safety of installation process is ensured and excessive initial stress injuries in the member is avoided, which can realize the on-line control of installation process. The main contents are as follows:1) The state of the art for development and the application of the spatial steel truss with huge-span are comprehensive commented, and the positive results and disadvantages of past research are summarized at the same time;2) With the application of ANSYS nonlinear analysis, 3-dimensional modeling of steel truss are established and the distribution of stress and displacement of the member are calculated with six programs that the number of its suspension point is 2,4,6,8,10,12, respectively. Then the most reasonable lifting scheme are chosen with lifting point of 8.In addition, the distribution of stress and displacement of steel truss are simulated in the process of bearing installation to control the construction of the initial stress injuries;3) The stress of the main force rod of winding bar, braces and bottom chord are tested during the lifting and temporary fixed period with two specimens of steel truss in the work site. The real-time data is transmitted to the on-line real-time control software (complied by Bi Wenping) to control the maximum value of the stress; 4) Finally, the stress curve of memeber distribution of stress are given during the lifting and temporary fixed period, acording to the comparison between the data of field trials and numerical analysis, which can provide a good suggestions for the similar construction and design of steel truss on the future.