Steel bridge long-term performance research technology framework and research progress

2016 ◽  
Vol 20 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Chunsheng Wang ◽  
Lan Duan ◽  
Musai Zhai ◽  
Yuxiao Zhang ◽  
Shichao Wang
Keyword(s):  
Base Material ◽  
Fatigue Performance ◽  
Research Progress ◽  
Steel Bridge ◽  
Performance Study ◽  
Research Technology ◽  
Study Results ◽  
Long Term Performance ◽  
Term Performance

To ensure structural sustainability, it is necessary to conduct steel bridge long-term performance study, including bridge design, evaluation, maintenance, and reinforcement technology. The research on steel bridge long-term performance is introduced in four aspects: (1) fatigue performance experimental study for full-scale orthotropic steel bridge decks in laboratory to study its fatigue failure mechanism, in order to improve fatigue design methodology and find rational reinforcement and maintenance method; (2) conducting steel bridge out-of-plane distortion-induced fatigue performance study, and developing cold reinforcement method; (3) performance study for base material and typical joint under long-term vehicle and environmental effect in aging steel bridges, and safety assessment and maintenance of existing steel bridge; (4) temperature gradient monitoring for steel box girder model to build the temperature design mode. Meantime, in-situ tests and monitoring are conducted for steel bridge long-term performance detection, assessment, and maintenance. The study results in this article build the research framework of steel bridge long-term performance preliminarily, which is the basis for steel bridge sustainable design, maintenance, and cold reinforcement methodology system.

scholarly journals Experimental and Numerical Examination of Naturally-Aged Foam-VIP Composites

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2539 ◽  
Author(s):  
Kaushik Biswas ◽  
Rohit Jogineedi ◽  
Andre Desjarlais
Keyword(s):  
Performance Monitoring ◽  
Numerical Models ◽  
Test Facility ◽  
Exposure Test ◽  
Rigid Foam ◽  
Study Results ◽  
Long Term Performance ◽  
Term Performance ◽  
Thermal Conductivities

This article describes an aging study of a foam-vacuum insulation panel (VIP) composite insulation board installed on a test wall in a natural exposure test facility through a 30-month period. Silica-based VIPs with a polymeric barrier film were used in this study. The study results showed the effectiveness of a VIP-based insulation to reduce the heat gains and losses through a wall compared to regular rigid foam insulation of the same thickness. However, the long-term performance monitoring indicated a gradual decline in the thermal performance of the foam-VIP composite. In addition, one-dimensional numerical models were created to simulate the in situ behavior of the foam-VIP composite. One model utilized constant thermal conductivities of the test wall components and another utilized temperature-dependent thermal conductivities; the latter used measurements of conductivity over temperatures ranging from −15 to 55 °C. The results of the simulations emphasized the need to use both temperature and time-dependent material properties for accurately predicting the long-term performance of VIP-based insulation systems.

Pavement Evaluation for ERS Steel Deck Pavement Using Accelerated Loading Test

2017 ◽  
Vol 744 ◽  
pp. 97-104
Author(s):  
Fei Chen ◽  
Ke Zhong ◽  
Xiao Hao Wei
Keyword(s):  
Steel Bridge ◽  
Loading Test ◽  
Pavement Evaluation ◽  
Loading System ◽  
Loading Tests ◽  
Pavement Structures ◽  
Long Term Performance ◽  
Term Performance ◽  
Steel Deck

In order to verify the practical application of ERS steel deck pavement system, based on the project of Jia Shao bridge, the pavement accelerated loading system is used to test the long-term performance of the steel bridge deck pavement. Tests find that the absolute value of the average rut growth depth of ERS and ERN is less than 5mm when the number of axle loads is 2.05 million times. After more than 1.3 million loading tests, the two deck pavement structures are almost impermeable to water and their anti-skid properties also tend to be stable. The results show that ERS and ERN are not cracked under natural conditions and have excellent anti-rutting performance.

Dynamic Analysis for Steel Bridge Deck Thin Surfacing with Cracks

2012 ◽  
Vol 594-597 ◽  
pp. 1569-1572
Author(s):  
Xun Qian Xu ◽  
Jian Bo Wang ◽  
Jian Ping Chen
Keyword(s):  
Bridge Deck ◽  
Design Method ◽  
Response Analysis ◽  
Steel Bridge ◽  
Road Roughness ◽  
Harmonic Response Analysis ◽  
Long Term Performance ◽  
Term Performance ◽  
Steel Deck

In order to improve the design method for resisting crack, this paper analyzed the dynamic characteristics of steel deck asphalt thin surfacing with cracks. The model analysis and harmonic response analysis were included to the steel bridge deck thin surfacing. Impact coefficients were calculated with different load cases, road roughness and crack damage. The conclusions can provide a theoretical reference for the assessments of the dynamic failure and long-term performance of the steel bridge deck thin surfacing.

scholarly journals Preparation and Evaluation of Paracetamol Effervescent Tablets under Normal and Exaggerated Storage Conditions

2015 ◽  
Vol 17 (1) ◽  
pp. 75-78
Author(s):  
Rehana Sultana ◽  
Krishna Sarker ◽  
Sakina Sultana
Keyword(s):  
Pharmaceutical Journal ◽  
Storage Conditions ◽  
Bench Mark ◽  
Content Uniformity ◽  
Cool Temperature ◽  
Performance Study ◽  
Long Term Performance ◽  
Term Performance ◽  
Preparation And Evaluation

A single blind study was conducted to prepare and evaluate paracetamol effervescent tablets. Potency, content uniformity, diameter, thickness and crushing strength of the prepared tablets were used as the bench mark parameters for quality assessment. Our results showed that all parameters met official values except for friability. The performance of the tablets in terms of duration of effervescence was investigated under high stresses of humidity as well as at low and high temperatures. The duration of the investigational period lasted for 3 days and results showed an increase in effervescence time in each case. In this study, the normal effervescence time at 111.00±14.22 seconds was changed to 286.13±55.18 seconds, 140.38±21.59 seconds and 158.63±26.14 seconds under high humidity, at refrigeration (representing cool temperature) and at high temperature, respectively. Here, a long term performance study was also conducted under normal storage conditions spanning a period of 60 days. Duration of effervescence on day 1 was 212.54±0.34 seconds, but at the end of 60 days the duration increased to 634.23±0.65 seconds. In the present study the changes in organoleptic properties were also evaluated. Results showed that the properties remained the same over a period of 60 days while the potency of the drug reduced from 99% to 95%. DOI: http://dx.doi.org/10.3329/bpj.v17i1.22320 Bangladesh Pharmaceutical Journal 17(1): 75-78, 2014

scholarly journals Long Term Performance Study of a Direct Methanol Fuel Cell Fed with Alcohol Blends

Energies ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 282-293 ◽  
Author(s):  
Teresa Leo ◽  
Miguel Raso ◽  
Emilio Navarro ◽  
Eleuterio Mora
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Performance Study ◽  
Direct Methanol ◽  
Long Term Performance ◽  
Term Performance ◽  
Methanol Fuel Cell
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