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| Title: | A FIELD STUDY ON SUPER-TALL BUILDING/SUPER-LONG PILE/THICK RAFT INTERACTION IN SHANGHAI | |
| DOI No: | 10.1142/9789812701480_0040 | |
| Source: | TALL BUILDINGS (pp 250-257) | |
| Author(s): | QINGGUO FAN
Shanghai Construction Group, Shanghai 200120, China BIAOBING DAI Shanghai Construction Group, Shanghai 200120, China WENLONG DENG Shanghai Construction Group, Shanghai 200120, China ZHIYONG AI College of civil engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China XIHONG ZHAO College of civil engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China |
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| Abstract: | It is the first time in China to carry out such a field experimental study to provide the information on the frame-shear wall structure/super-long pile/thick raft interaction in soft soils. Chang-feng Market is of 60-storey, 238m high, with 4.5m~6.25m thick raft and bored piles of ะค850mm drilled into silty sand layer with medium and coarse sands (i.e. 9-2 soil layer in Shanghai) to a depth of 72.5m. This building is composed of a 60-storey building and a 10-storey podium. Both have 4-storey basement. The depth of embedment is 18.95m. In order to obtain the more information on interaction, after completion of excavation engineering, on July 11, 2004 the following transducers for different purposes were installed in foundation with construction stage, respectively. 19 rebar stress gauges and 19 strain gauges on the top of piles and 36 earth pressure cells beneath the foundation base were installed to measure the pile load and foundation. contact pressure. 28 rebar stress gauges were attached to the top and bottom reinforcing steel at 7 locations in the raft to measure the steel stresses. 5 piezometers were installed about 0.5~1.0m below the base of excavation to observe the lift and dissipation of excess pore water pressure and the effect of buoyancy on the bottom. To get the special information for checking the real load on the mega columns and corresponding contribution of every storey stiffness to foundation, 5 rebar stress gauges and 5 strain gauges were attached 5 typical columns. Meanwhile, for the same purpose, to record the settlements of the building with respect to time, 21 permanent reference points were established on columns and walls. Based on the change of settlement type it will provide an important evidence to analyze the contribution of every storey stiffness to foundation. Now the building is still under construction. However, some valuable data have obtained. For example, load-sharing between pile and raft is an objective fact even for super-long pile foundation. The main structure will be completed in the coming September. It is expected that the field experimental and analytical results will be satisfied. | |
| Full Text: | View full text in PDF format (496KB) | |
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