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Seismic demand of plan-asymmetric structures:a revisit

Earthquake Engineering and Engineering Vibration 2013年第1期12卷 99-117页

作者： Rana Roy Suvonkar Chakroborty Department of Aerospace Engineering & Applied Mechanics Bengal Engineering and Science UniversityShibpurIndia SMS India Pvt.Ltd. SMS GroupIndia

In view of the recognition of the importance of the interdependent behavior of strength and stiffness of walltype structural elements,the seismic demand of plan-asymmetric systems is revisited.Useful strength distribution strategies,i.e.,＇Center of Strength-Center of Mass（CV-CM） coinciding＇ and ＇Balanced Center of Strength-Center of Resistance（CVCR）＇ are adopted.design charts for the seismic demand of classical uni-directionally and bi-directionally asymmetric systems are developed in a simple unified format.A conceptual framework is also outlined to conveniently apply the design charts.Illustrations are included to explain the use of the current recommendations in practical design.The study also highlights the relative performance of ＇CV-CM coinciding＇ and ＇Balanced CV-CR＇ criteria.

关键词： asymmetry seismic strength dependent stiffness design chart

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Free-Fall Penetration Behaviors of A New Dynamically Installed Plate Anchor in Marine Clay

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China Ocean Engineering 2020年第6期34卷 795-805页

作者： LAI Ying HUANG Yun-han CHEN Chuan ZHU Bin MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China College of Civil and Harbour Engineering Jiangsu Ocean UniversityLianyungang 222005China

A new dynamically installed plate anchor, the Flying Wing Anchor~?, has been developed as a sustainable anchor concept for deep-water offshore wind turbines. The anchor is firstly installed by free-fall penetration and then followed by drag embedment. If the anchor is subjected to environmental loads, it dives deeper to mobilize a higher capacity. This study presents a series of free-fall penetration tests with model anchors in different weights to assess the anchor behavior during the free-fall penetration performance in one-layer soil with a constant shear strength profile. Anchor velocities and embedment depths were measured by a magnetometer. An energy-based model and a force-based model were calibrated against the test results of model anchors with different weights. Based on the calibrated force-based model, a series of design charts were developed to estimate the embedment depth of anchors in different sizes and with different impact velocities in various marine clays. The framework to plot design charts presented herein can be potentially applied to other dynamically installed anchors to predict embedment depth in engineering practice.

关键词： dynamic anchor dynamic installation plate anchor scale effect design chart

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Undrained stability of active trapdoors in two-layered clays

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Underground Space 2021年第4期6卷 446-454页

作者： Suraparb Keawsawasvong Suched Likitlersuang Department of Civil Engineering Thammasat School of EngineeringThammasat UniversityPathumthani 12120Thailand Centre of Excellence in Geotechnical and Geoenvironmental Engineering Department of Civil EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok 10330Thailand

Several environmental changes can induce an underground hole,leading to failures of non-ground infrastructure,such as pavements.Under a continued overload of traffic action on the pavement,the hole can potentially collapse,leading to creation of potholes.This phenomenon is commonly known as a trapdoor problem.Even though there are several previous works considering this problem,the stability solutions of trapdoors in two-layered soils have not yet been studied.To estimate the undrained stability of active trapdoors in two-layered clays under plane strain conditions,numerical solutions based on the finite element method have been developed.The influence parameters include the coverage depth of the trapdoor,and the thickness and undrained shear strength of the clay layers.The effects of these parameters on the stability of active trapdoors as well as their associated failure mechanisms are examined and discussed in this paper.The solutions are presented in the form of dimensionless charts that can be used for the design of trapdoor systems in two-layered clays with different thicknesses and undrained shear strengths.

关键词： Trapdoor Two-layered clay Active failure Finite element method design chart

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Critical shear stress approach for self-cleansing design of a rectangular channel

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International Journal of Sediment Research 2021年第5期36卷 678-685页

作者： Charles Hin Joo Bong San Chuin Liew Fang Yenn Teo Tze Liang Lau Aminuddin Ab Ghani Faculty of Engineering Universiti Malaysia Sarawak 2. Faculty of Engineering Computing and Science Swinburne University of Technology Sarawak Campus 3. Faculty of Science and Engineering University of Nottingham Malaysia 4. School of Civil Engineering Universiti Sains Malaysia Engineering Campus River Engineering and Urban Drainage Research Centre (REDAC) Universiti Sains Malaysia Engineering Campus

The current study aims at the development of an incipient motion equation and a self-cleansing design chart based on the critical shear stress approach for a rectangular channel. Data from previous experimental work on incipient motion for rectangular flumes were subjected to multiple linear regression analysis. Selected regression models were further assessed through cross validation using the remaining data from the previous experimental work and a performance test using another three sets of existing data from the literature. The best regression model from the current study was found to perform much better than two of the existing equations in the literature by Novak and Nalluri and El-Zaemey with respect to having 95% of the predicted values fall within the acceptable discrepancy ratio range of 0.5 e2.0. The equations by Novak and Nalluri and El-Zaemey only managed to have 10% and 16%, respectively, of the predicted values fall within the acceptable discrepancy ratio. The developed best regression model has a coefficient of determination (Rp2) value of 0.9960, adjusted coefficient of determination (Radj2)value of 0.9960, predicted coefficient of determination (Rpre2) value of 0.9958, mean square error(MSE)value of 0.0004, and Mallow’s Cpvalue of 3.0. The best regression model was further chosen to develop a self-cleansing design chart for rectangular channels. The design chart which relates the minimum sewer slope Sminwith the minimum critical shear stress, tc, for the respective standard rectangular channel size of an open channel system could be used to check and determine the suitable minimum slope for selfcleansing design purposes.

关键词： design chart Incipient motion equation Open channel system Rectangular channel Self-cleansing Shear stress

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