Fundamental period and mode shape of layered soil profiles

2002 ◽  
Vol 22 (9-12) ◽  
pp. 885-891 ◽  
Author(s):  
A.H Hadjian
Keyword(s):  
Mode Shape ◽  
Layered Soil ◽  
Fundamental Period ◽  
Soil Profiles

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.

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.

An Alternative Method to Estimate Fundamental Period of Layered Soil Deposit

2014 ◽  
Vol 45 (2) ◽  
pp. 192-199 ◽  
Author(s):  
K. V. Vijayendra ◽  
Sitaram Nayak ◽  
S. K. Prasad
Keyword(s):  
Layered Soil ◽  
Fundamental Period ◽  
Alternative Method
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