Influence of Layered Soil Profiles on the Application of p-y Curves for Large Diameter Monopiles

2018 ◽  
pp. 415-420
Author(s):  
Pauline Truong Suzuki ◽  
David Maloney ◽  
Liv Hamre
Keyword(s):  
Large Diameter ◽  
Layered Soil ◽  
Soil Profiles

A Simple Approach for Estimating the First Resonance Peak of Layered Soil Profiles

2018 ◽  
Vol 12 (01) ◽  
pp. 1850005 ◽  
Author(s):  
Haizhong Zhang ◽  
Yan-Gang Zhao
Keyword(s):  
Soil Profile ◽  
Single Layer ◽  
Resonance Peak ◽  
Layered Soil ◽  
Soil Profiles ◽  
Simple Method ◽  
Amplification Ratio ◽  
Local Site ◽  
The One ◽  
Input Motion

The first resonance peak, Gs1, represents the amplification ratio of seismic motion when resonance between input motion and the local site occurs. The Gs1 is important for understanding amplification characteristics of local site, thus it has been adopted for evaluating site effects in the Japanese Seismic Code. Herein, a simple method for estimating the Gs1 of layered soil profiles is proposed. By replacing a multi-layer soil profile on bedrock with an equivalent one-layer soil profile, the Gs1 and fundamental period are easily obtained. To realize the one-layer profile, we develop a procedure to replace a two-layer soil profile on bedrock with an equivalent single-layer profile. This procedure is then applied successively to a multi-layer soil profile to obtain an equivalent single-layer soil profile. The validity of the proposed method is demonstrated by evaluating 67 representative sites. The results obtained using the proposed procedure agree well with those produced by the wave propagation method.

A Simple Approach for Estimating the Fundamental Mode Shape of Layered Soil Profiles

2019 ◽  
Vol 13 (01) ◽  
pp. 1950003
Author(s):  
Haizhong Zhang ◽  
Yan-Gang Zhao
Keyword(s):  
Mode Shape ◽  
Fundamental Mode ◽  
Close Agreement ◽  
Site Response ◽  
Vertical Direction ◽  
Simple Approach ◽  
Layered Soil ◽  
Soil Profiles ◽  
Seismic Code ◽  
Response Parameter

The fundamental mode shape of layered soil profiles is a key site response parameter, it has been adopted into the Japanese seismic code to represent the shape of the soil displacement response along the vertical direction. In this study, a simple approach for estimating the fundamental mode shape of layered soil profiles is developed. The proposed approach can directly model the fundamental mode shape and can be conveniently implemented using arithmetic operations, thus making it suitable to be used by the engineers. The assessments of the proposed approach using a series of layered soil profiles demonstrate that it can produce results in close agreement with the actual results.

Elasto-Plasticity Solution on Bearing Characteristic of Cast-in-Place Concrete Pipe Pile with Large Diameter in Layered Soil under Lateral Load

2010 ◽  
Vol 168-170 ◽  
pp. 2321-2328
Author(s):  
Jian Wei Zhang ◽  
Han Long Liu ◽  
Gui Yang
Keyword(s):  
Large Diameter ◽  
Internal Force ◽  
Lateral Load ◽  
Layered Soil ◽  
Pipe Pile ◽  
Concrete Pipe ◽  
Elasto Plasticity ◽  
Force Profile ◽  
Pcc Pile ◽  
Bearing Characteristic

Aimed at problems lying in the exiting methods for calculation of laterally loaded piles installed in layered soils, the elasto-plasticity solution of cast-in-place concrete pipe pile with large diameter (PCC pile) in layered soil under lateral load based two-parameter foundation model and unity limiting force profile, deduced the finite difference solution based unity limiting force profile(LFP), established the calculation program of the displacement and internal force of pile. It was shown that the calculated pile moment and pile displacement coincided very well by computation and comparison of model test and FEM, verified the method’s correction. Meanwhile, the method was more precise and efficient than the existing conversion methods of subgrade modulus. Therefore, it could be useful for the design and analysis of PCC pile under lateral load.

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