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Level of pile groups under eccentric load bearing properties by model tests and Design Method

Author: WangShuXing
Tutor: ChenRenPeng；KongLingGang
School: Zhejiang University
Course: Civil Engineering
Keywords: Pile group Horizontal load Large - scale model test Eccentricity Load coupling effect Calculation Method
CLC: TU473.1
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 3
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Abstract


In recent years , with the rapid development of China's marine economy , offshore large-scale infrastructure construction have been expanding, such as marine bridges , offshore platforms, sea power transmission tower. These large structures are often under sea wind , water and even ship impact force of horizontal load effect. These loads are often in the form of a horizontal pass to the eccentric group pile foundation structure , resulting in a complex structural response . At present, for such a response is very limited knowledge and understanding of the urgent need to carry out appropriate research. This eccentricity under different pile groups under lateral loads traits were the work of a large -scale model tests and theoretical analysis . Model test includes two sets of saturated silt in the 3 × 3 pipe pile pile groups , divided into large and small eccentric two cases ( respectively eccentricity e = 11D and 6D), and pile load test and calm water twist pile static load test . Then through the pile group calculation software GROUP on the above test were calculated and analyzed . Experimental results show that the level of load torque load and coupling effects exist , plus torque along the pile group significantly reduced the carrying capacity of the load direction , the horizontal load on pile group improved torsional rigidity has some effect ; pile group horizontal shear , bending moment and torque distribution inhomogeneity is very obvious, and the location on the pile ; eccentricity greater force distribution more uneven ; horizontal shear and torsional resistance for resistance to the applied torque play an important role , as the external load increases, gradually increasing the proportion of horizontal shear . Since push and twist loading pile group with each pile shear displacement direction varies, and each row of piles shear huge difference when calculating the p value multiplier does not follow the traditional pile group under lateral load carried , combined gROUP calculations presented in this new p multiplier correction method, and each pile pile group average torsional stiffness relative to the torsion test pile enhancement factor . Based on the above results raised the level of pile groups under eccentric load calculation method .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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