Title :
Compression Behavior on Precast Concrete Assembly Spread Foundation for Qinghai-Tibet AC/DC Grid Interconnection Project
Author :
Xianlong Lu ; Zengzhen Qian ; Ruiming Tong
Author_Institution :
China Electr. Power Res. Inst., Beijing, China
Abstract :
The precast concrete assembly foundation for Qinghai-Tibet AC750kV/DC±400kV grid interconnection project in frozen soil area was tested under compression load. The mechanical co-working properties for the different parts of the foundation were analyzed based on the observed results of soil pressure, structural displacement and stress. Under compression load, the displacement of the ring flange connecting the column, the bottom slab, and the joint seam of the two consolidated bottom slabs conformed with that of the top plane of the foundation. Two stages of elastic and elastic-plasticity were observed according to load-displacement curves of the foundation. The stress of the channel beams increased with the compression load and was in elastic stress condition. Under compression load, the two edges which were parallel to the joint seam of two consolidated foundation slabs had a tendency to up warping. But the displacements of all angular measuring points were less than that of the foundation top plane. The displacement and the stress of the different connected parts redistributed until the new balance developed. As a result, the different connected parts of the precast concrete assembly foundation co-operated to carry the compression load. The structural characteristic of the assembly foundation, the gaps among the assembly parts, the discrepancy of the nut screwing up and the mismatching tolerance during consolidating were the key factors to determine the performance of the foundation. Generally, under compression load, all structural parts of precast concrete assembly foundation had good entirety.
Keywords :
assembling; beams (structures); compressive strength; concrete; elastoplasticity; flanges; foundations; geotechnical engineering; power grids; power system interconnection; rings (structures); slabs; soil; stress analysis; structural engineering; Qinghai-Tibet AC-DC grid interconnection project; bottom slab; channel beams; compression behavior; compression load; consolidated bottom slabs; consolidated foundation slabs; elastic stress condition; elastic-plasticity; frozen soil area; load-displacement curves; mechanical co-working properties; precast concrete assembly spread foundation; ring flange; soil pressure; structural characteristic; structural displacement; structural stress; tolerance mismatching; voltage -400 V; voltage 400 V; voltage 750 kV; Assembly; Concrete; Displacement measurement; Slabs; Soil; Stress; Transmission line measurements; Qinghai-Tibet AC/DC grid interconnection project; assembly foundation; frozen soil;
Conference_Titel :
Intelligent System Design and Engineering Applications (ISDEA), 2013 Third International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4673-4893-5
DOI :
10.1109/ISDEA.2012.115