Civil Engineering Association

Here the link that you need for "Satisfying Drift and Acceleration Criteria with Multi-Stage Friction Pendulum Isolation Systems"

Fatigue‐Driven Wind Farm Towers: A Practical Introduction to Fatigue Calculations

This paper discusses the fatigue design of steel tubular towers serving as the support structures for large power‐generating wind turbines. Unlike wind and earthquake analysis for most routine structures, fatigue analysis is not a mainstream concern for structural engineers. However, wind farm tower structures are subject to high‐cycle fatigue on the order of several hundred million cycles over a typical 20‐year design lifetime. In fact, fatigue loading often governs tower design. This paper focuses on the S‐N curve approach using the Miner's Rule damage summation method as implemented in the Eurocode. European fatigue guidelines serve as the current standard of the wind industry worldwide and even in the U.S. market. This paper will discuss and illustrate fatigue concepts such as the following: 1) Fatigue loading basics including the popular “Rainflow” cycle counting method 2) The fatigue load spectrum extracted from the Markov matrix 3) The fatigue damage‐equivalent load and its calculation from the fatigue load range spectrum 4) Construction details and fatigue Detail Categories 5) The “hot spot” stress approach in accordance with International Institute of Welding (IIW) guidelines that provide methods to calculate stress concentration factors from finite element analysis models. 6) Fatigue calculations using a load‐to‐stress transfer function that is nonlinear.

(05-21-2012, 07:29 PM)hapsea Wrote: [ -> ]Fatigue‐Driven Wind Farm Towers: A Practical Introduction to Fatigue Calculations

Download link:

Creep Behavior and Its Prediction for Normal Strength Concrete Made from Crushed Clay Bricks as Coarse Aggregate

To study the effect of crushed clay bricks as coarse aggregate on creep behavior of concrete, a comprehensive testing program was conducted. Concrete cylinder specimens having characteristic or specified compressive strength of 17.2, 24.0, and 27.5 MPa were prepared from both natural stone and crushed clay brick aggregate. Mix design ratios were evaluated in a way so that volumetric content of coarse aggregate, both brick and stone, remained same for all concrete samples. Specimens were subjected to creep testing at the 7th and 28th day after casting and creep strain data were recorded up to 300 days. Results show that although strength and other environmental parameters remain the same, concrete made from crushed clay brick as coarse aggregate have a higher creep strain than that of concrete made from natural stone aggregate. This increase in creep strain ranges from 30% to as high as 45% for the 300-day loading history considered. Additionally, to select an appropriate model to predict creep in brick aggregate concrete, the effectiveness of five widely used prediction models were examined. Predicted creep strain from ACI 209R, CEB-FIP, B3, GL2000, and Eurocode 2 models were compared with experimental results. By using statistical analysis, the authors established that prediction of creep by GL2000 model is closest to the experimental results. Finally, a modification factor has been proposed that may be incorporated so that prediction of creep strain by the GL2000 model in brick aggregate concrete becomes more realistic.







Thanks to the uploader!


G

@Grunf

Here

Please if anyone have access to the ASCE journal,provide the article which titled :Base Isolation for Seismic Retrofitting of Structures,by: Vasant A. Matsagar,
the article can be found at the following page:
Thanks

David- smith,

you can refer to this link

Hi, I need:

Improving MASW Results for a Site with Shallow Bedrock through the Use of Higher‐Mode Data

GeoFlorida 2010: Advances in Analysis, Modeling, & Design
Proceedings of the GeoFlorida 2010 Conference
Daniel W. Casto, Carlos Calderón‐Macías, Barbara Luke, and Ronald Kaufmann

Establishing Confidence in Surface Wave Determined Soil Profiles

GeoRisk 2011: Geotechnical Risk Assessment and Management (GSP 224)
Proceedings of the GeoRisk 2011 Conference
P. Michaels


Thanks

Hi Giguni,

you can download the files from these links

Near-Field Effects on Array-Based Surface Wave Methods with Active Sources
J. Geotech. Geoenviron. Eng. 135, 399
Sungsoo Yoon and Glenn J. Rix

Discussion of “Near-Field Effects on Array-Based Surface Wave Methods with Active Sources” by S. Yoon and G. J. Rix
J. Geotech. Geoenviron. Eng. 136, 773 (2010);
A. M. W. Aung and E. C. Leong

Joint Inversion for Apparent Phase Velocities of Rayleigh and Love Waves
GeoCongress 2006: Geotechnical Engineering in the Information Technology Age
Proceedings of GeoCongress 2006
Sung‐Ho Joh, Kenneth H. Stokoe, II, Il‐Wha Lee, Tae‐Ho Kang, Brent Rosenbld, and James A
.Bay

Mitigation of Near-Field Effects for Seismic Surface Wave Velocity Estimation with Cylindrical Beamformers
Daren J. Zywicki, and Glenn J. Rix,
Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 8, August 2005, pp. 970-977

Thanks