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| Model tests of nonlinear dynamic responses for laterally loaded long piles based on Winkler foundation theory |
| MA Jianjun1, WANG Man1, LIU Jiayu1, NIE Mengqiang2, WANG Lianhua3 |
1.School of Civil Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2.Luoyang Beijiao Airport, Luoyang 471001, China;
3.College of Civil Engineering, Hunan University, Changsha 410082, China |
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Abstract Based on Winkler model, an elastic foundation was discretized as linear springs to establish a long pile-spring dynamic interaction model test system, and study nonlinear dynamic responses of pile foundation under a lateral simple harmonic excitation exerted on pile top. Through model tests under 12 working conditions in two groups, influences of pile parameters, foundation constraints, pile top counterweight and excitation characteristics on dynamic response amplitude, resonance and spatial motion of pile foundation were analyzed. The test results showed that nonlinear characteristics of pile foundation dynamic response are significant with increase in excitation amplitude; under a specific excitation frequency, the vibration exciter resonates with the model pile to change dynamic response characteristics of the pile-soil system to a certain extent; if foundation constraints are relaxed, the main resonance response of pile foundation is characterized by soft spring, so soil-structure interaction has a qualitative influence on dynamic characteristics of pile foundation; with the change of pile top counterweight, the response amplitude of pile foundation changes greatly under small amplitude excitation; observing the pile top’s dynamic trajectory, it has an obvious out of plane motion; here, the direct correlation between theoretical analysis and tests is established to promote nonlinear dynamic tests of laterally loaded long piles based on Winkler model.
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Received: 04 March 2020
Published: 15 January 2021
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