scholarly journals The Plaster Ceilings of Buckingham Palace and Windsor Castle: Their Construction, Condition and Conservation

2021 ◽  
Author(s):  
S. Brookes ◽  
K. Clark ◽  
R. Frostick ◽  
R. Ireland ◽  
L. Randall
Keyword(s):  
Construction Condition

scholarly journals Spatial Heterogeneous Characteristics of Ridesharing in Beijing–Tianjin–Hebei Region of China

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3214 ◽  
Author(s):  
Ye Ma ◽  
Biying Yu ◽  
Meimei Xue
Keyword(s):  
Travel Behavior ◽  
Environmental Influence ◽  
Travel Pattern ◽  
Regional Heterogeneity ◽  
Demand And Supply ◽  
Service Demand ◽  
Depth Study ◽  
Construction Condition ◽  
Access Services ◽  
Bth Region

Ridesharing is becoming popular in many cities in China where transportation alternatives are easily accessible. Individuals typically access services by smartphone app developed by ridesharing company to join a trip offered by other private vehicle’s drivers who share same or geographically close destination. However, there are some internal differences within this region indicating the service heterogeneity of ridesharing. In order to discover this regional heterogeneity, this paper chooses Beijing–Tianjin–Hebei (BTH) region as research target and uses BTH regional ridesharing data provided by DiDi Chuxing Company. Then, this paper conducts an in-depth study by summarizing the travel pattern characteristics and evaluating the environmental impacts that result from individuals participating in ridesharing services. Lifecycle analysis of fuel and environmental input–output are applied to estimate the direct and indirect environmental impact separately. The results reveal heterogeneous spatial heterogeneous of ridesharing, including travel pattern and environmental influence caused by service demand and supply, which results from the unbalance of regional development and infrastructure construction condition of the transportation system, and other travel behavior differences.

Numerical Simulation Analysis for Enclosure Piles Cracking of a Deep Pit Foundation

2011 ◽  
Vol 109 ◽  
pp. 276-280
Author(s):  
Ji Chao Zhang ◽  
Yong Kang Yang ◽  
Yong Xu
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Element Model ◽  
Wind Load ◽  
Load Direction ◽  
Foundation Pit ◽  
Deep Pit ◽  
Disadvantageous Factors ◽  
Construction Condition ◽  
The Finite Element Model

Based on the appearance of crack of enclosure piles on a foundation pit, Midas GTS is adopted to establish the finite element model. Through the numerical simulation, the influence of the direction of wind load, wind scale and prestress of anchor are analyzed, the worst wind load direction, unfavorable construction condition, maximum moment of enclosure piles are ensured, crack width in different disadvantageous factors are calculated, which provides a guide for continuous construction.

Cracking Analysis and Reinforcement Method for a Thin-Wall Plain-Concrete Pier

2014 ◽  
Vol 578-579 ◽  
pp. 1007-1011
Author(s):  
Wen Ya Ye ◽  
Xiao Qing Wu
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Plain Concrete ◽  
Thin Wall ◽  
High Speed Rail ◽  
Railway Bridges ◽  
Massive Concrete ◽  
Increasing Trend ◽  
Treatment Measures ◽  
Construction Condition

In view of the rapid development of the high-speed rail construction in China at present, some new plain concrete piers of railway bridges cracked in an increasing trend. Combining a real project, this paper analyzed the causes of the cracking in massive concrete piers through the actual construction condition and the materials prosperities, and made corresponding prevention and improvements for the cracking, provided the reinforcing treatment of cracking piers with corresponding programmes. The analysis and treatment measures for the project will present a reference for the similar projects in the future.

Simulation Study on Construction Process of Complex Spatial Steel Structure Based on the Construction Mechanics

2012 ◽  
Vol 226-228 ◽  
pp. 1209-1213
Author(s):  
Wei Lin Zhang ◽  
Zhi Xin Wu ◽  
Bai Hui Chen
Keyword(s):  
Finite Element ◽  
Steel Structure ◽  
Frame Structure ◽  
Construction Process ◽  
Element Analysis ◽  
Large Span ◽  
Critical Control Points ◽  
Construction Step ◽  
Construction Mechanics ◽  
Construction Condition

The construction process of the large span spatial steel structure was studied by finite element method and the time-varying mechanics. The construction process of complex spatial frame structure was divided into the installation and dismount supporting phase, and each stage was divided into 15 steps in which mainly simulated and analyzed the whole construction process by "life-death" element. The critical control points of each construction step were identified, the stress state, interval value and the maximum stress in the structure of each construction condition were conformed; rod deformation in construction process was analyzed in construction program. The result showed that the large span spatial steel structure construction scheme was numerical simulated and calculated by the method of finite element analysis and the mechanical state, deformation and safety of building structure were predicted accurately during construction.

scholarly journals Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors

Sensors ◽  
2017 ◽  
Vol 17 (8) ◽  
pp. 1843 ◽  
Author(s):  
Kyung-Joon Shin ◽  
Seong-Cheol Lee ◽  
Yun Kim ◽  
Jae-Min Kim ◽  
Seunghee Park ◽  
...  
Keyword(s):  
Embedded Sensors ◽  
Damage Monitoring ◽  
Construction Condition ◽  
Post Tensioned

Performance and Economic Evaluation of Ground Heat Exchangers

2013 ◽  
Vol 838-841 ◽  
pp. 1913-1916 ◽  
Author(s):  
Seok Yoon ◽  
Nam Hyun Cho ◽  
Gyu Hyun Go ◽  
Seung Rae Lee
Keyword(s):  
Thermal Performance ◽  
Heat Exchangers ◽  
Construction Cost ◽  
Performance Tests ◽  
Operation Condition ◽  
Partially Saturated ◽  
Ground Heat Exchangers ◽  
Loop Design ◽  
Design Program ◽  
Construction Condition

This paper presents experimental study on the evaluation of thermal performance of U and W type ground heat exchangers (GHEs). These GHEs were installed in a partially saturated landfill ground which was composed of silt and clay in the runway area of Incheon International airport. Thermal performance tests (TPTs) were conducted for 100 hours under the continuous operation condition. Heat exchange rate of individual GHE was evaluated from the TPT results, and construction cost was also estimated. The required Borehole length of U and W type GHEs was calculated considering real construction condition from GLD (ground loop design) program.

An IoT device for striking of vertical concrete formwork

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shemin T. John ◽  
Athul Mohan ◽  
Merin Susan Philip ◽  
Pradip Sarkar ◽  
Robin Davis
Keyword(s):  
Compressive Strength ◽  
Real Time ◽  
Cost Effective ◽  
Concrete Columns ◽  
Content Type ◽  
Maturity Method ◽  
Early Age Concrete ◽  
Construction Condition ◽  
Practical Implications

PurposeTimely removal of formwork is one of the crucial aspects of construction management that directly influences the safety and quality of the structure as well as the economy of the project. Code recommendations in this regard are not widely practiced because of the difficulties in their implementations. Also, such code recommendations are not robust for all the possible construction conditions. The present paper proposes an IoT-enabled system that notifies the minimum striking time of vertical formwork based on a specified target compressive strength.Design/methodology/approachAn IoT device is proposed for the timely removal of vertical formwork by monitoring of early age concrete compressive strength in real-time. The maturity method is utilized for this purpose. The implementation of the proposed system is demonstrated on three concrete columns. The proposed system is found to be suitable for any construction condition.FindingsThe proposed system is a novel, cost-effective, IoT-enabled real-time monitoring system which includes features like cloud connectivity and remote monitoring. This system can be easily implemented at the site without any human intervention.Practical implicationsThe study explores the development of an IoT device for the timely removal of vertical formwork which will ensure quality, safety and productivity in concrete construction.Originality/valueThis paper is the first attempt to determine the minimum striking time of vertical formwork using IoT-based technology.

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