Abstract
A mall large roof rack has been used 17 years. Because of upgrade, addition of decorate load, and missing the original design drawings, the spatial site test and check calculation of bearing capacity will have to be done. Using some detection tools, we can get arrangement, size, displacement, deformation, etc. And we can sue 3d3s software of Tongji University to check the calculation of bearing capacity. Through calculation and analysis, put forward to the original network frame the whole pre-stressing reinforcement and part of steel reinforcement bar outsourcing way, satisfying the requirements of design and specification, and to avoid the welding process, shorten the construction period, and achieved good social benefits.
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