Repair of Major Cracks in Central Spans of the 4 Span Continuous Bridge, India

2018 ◽  
Author(s):  
Dhananjay A. Bhide ◽  
Prashant Dongre
Keyword(s):  
Construction Material ◽  
Remedial Measures ◽  
Construction Technique ◽  
Box Girder ◽  
Material Parameters ◽  
National Highway ◽  
Major Crack

Varsova Bridge is across Vasai Creek, about 35 Km from Mumbai, India. It is on National Highway 48. Two bridges, 555.32m long, exist at the crossing, built in 1970 and 2004 respectively. Old bridge has central 4 spans, built in continuous PSC box girder su configuration of 57.3 + 2 x 114.6 + 57.3 construction technique. 114.6m span on Mumbai end developed a major crack, 4mm wi about 12m from mid span. Main c height in both webs. The paper describes the investigations made through analysis the probable reasons and deciding remedial measures as well as execution of the same. used four different models as per construction material parameters. Final repair measure crack locations.

Study on Early Cracking Resistance of PC Box Girder Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1786-1792
Author(s):  
Wei Chun Zhong ◽  
Xiao Yi Zhang ◽  
Hui Zhou ◽  
Chuang Sheng Zheng
Keyword(s):  
Hydration Heat ◽  
Maximum Temperature ◽  
Strength Development ◽  
Cracking Resistance ◽  
Construction Stage ◽  
Maximum Temperature Difference ◽  
Construction Technique ◽  
Box Girder ◽  
Mixture Ratio ◽  
Girder Bridges

Early cracks of box girder are widespread during the construction stage of PC box girder bridges. The cracking resistance of a prestressed concrete continuous beam bridge was conducted from the point of construction technique. Experimental study on hydration heat and mechanical properties of box girder concrete at early age were carried out. The results shown that the casting temperature of the concrete, the peak temperature and the maximum temperature difference between inside and outside of the hydration heat were very low, which were 15.7°C, 8°C and 10.2°C, respectively. The strength development of the concrete was stable, and the mixture ratio was optimal. The concrete appearance quality was fairly good without visible cracks in the construction stage. The study reveals that the crack of girder bridges during the construction stage can be avoided by taking effective measures in the construction.

scholarly journals Simply-supported Box Girder Construction Technique of 40 m Movable Formwork Method Cast-in-Situ Railway Passenger Dedicated Line

2015 ◽  
Vol 4 (4) ◽  
pp. 30
Author(s):  
Zhemin Li
Keyword(s):  
Bearing Capacity ◽  
Cost Reduction ◽  
Time Limit ◽  
Type Number ◽  
Construction Technique ◽  
Box Girder ◽  
Simply Supported ◽  
Railway Passenger ◽  
Passenger Dedicated Line

<p>The movable formwork has the characteristics of light self weight, large bearing capacity, small rod type number, rapid assembling, and simplicity to construct. Therefore, when cast-in-situ concrete box girder is constructed, the moveable formwork has great meanings in cost reduction and project time limit shortening. By using this method, the difficulty that brackets cannot be distributed as the ground bearing capacity of bridges. Besides that, bridge sites is low is reasonably solved, cost of material and labor can be reduced, influence to underbridge is minimize, and the construction progress is accelerated. The simply-supported box girder construction technique of 40 m movable formwork method cast-in-situ railway passenger dedicated line is particularly analyzed.<strong></strong></p>

scholarly journals RESIDENTIAL EARTHEN ARCHITECTURE IN MULA (SPAIN): STUDY AND CATALOGUING OF ITS CONSTRUCTION TECHNIQUE

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 985-992
Author(s):  
F. J. López Martínez ◽  
V. La Spina ◽  
J. Fernández del Toro
Keyword(s):  
Residential Buildings ◽  
Construction Material ◽  
Construction Technique ◽  
Residential Architecture ◽  
Construction Techniques ◽  
Earthen Construction ◽  
Initial Identification ◽  
Characteristic 2 ◽  
Earthen Architecture ◽  
The City

Abstract. The city of Mula (Region of Murcia, Spain), of Islamic origin and built on the top of a hill, is dominated by the spectacular Renaissance castle of Velez and a mediaeval defensive wall. The wall remains, those still standing, consist of several enclosures and sections built in rammed earth. As many of these are a magnificent example of defensive earthen architecture, the Castle of Mula has been widely analysed and recently protected by a Master Plan. However, Mula’s unique old town, an Asset of Cultural Interest in the category of Historic-Artistic Complex, with its irregular and narrow streets at the foot of the castle, includes residential constructions (mansions, palaces and humble dwellings) made with earth. The traditional residential architecture of Mula includes characteristic 2- or 3-storey buildings with sloping roofs. However, there are no specific studies on these and the use of earth as a construction material. The main aim of the study therefore is to carry out an initial identification and cataloguing of the different earthen construction techniques in the historic residential buildings of the old town and their relation to the residential typology of Mula.

scholarly journals Simply-supported Box Girder Construction Technique of 40 m Movable Formwork Method Cast-in-Situ Railway Passenger Dedicated Line

2015 ◽  
Vol 4 (4) ◽  
pp. 30
Author(s):  
Zhemin Li
Keyword(s):  
Bearing Capacity ◽  
Cost Reduction ◽  
Time Limit ◽  
Type Number ◽  
Construction Technique ◽  
Box Girder ◽  
Simply Supported ◽  
Railway Passenger ◽  
Passenger Dedicated Line

<p>The movable formwork has the characteristics of light self weight, large bearing capacity, small rod type number, rapid assembling, and simplicity to construct. Therefore, when cast-in-situ concrete box girder is constructed, the moveable formwork has great meanings in cost reduction and project time limit shortening. By using this method, the difficulty that brackets cannot be distributed as the ground bearing capacity of bridges. Besides that, bridge sites is low is reasonably solved, cost of material and labor can be reduced, influence to underbridge is minimize, and the construction progress is accelerated. The simply-supported box girder construction technique of 40 m movable formwork method cast-in-situ railway passenger dedicated line is particularly analyzed.<strong></strong></p>

scholarly journals Confined Masonry – Analysis, Design and Comparison

10.29007/82lb ◽  
2018 ◽  
Author(s):  
Kushal Desai ◽  
S. B. Patel ◽  
V. V. Agrawal
Keyword(s):  
Construction Material ◽  
Unreinforced Masonry ◽  
Masonry Wall ◽  
Masonry Building ◽  
Construction Technique ◽  
Confined Masonry ◽  
Masonry Construction ◽  
Analysis Design ◽  
Unreinforced Masonry Building ◽  
User Friendly

Considering the present scenario, it is observed that the response of the unreinforced masonry building during the earthquake conditions have resulted into significant damages in buildings and subsequent life loss. The conventional method of masonry construction adopted so far utilizes the same construction material as in confined masonry, however the construction technique differs for both. This study has considered the analysis, design and comparison of confined masonry wall with unreinforced masonry wall. The differences in the method of construction and the performance of both, under the seismic conditions has been considered through the study on a sample building. A user friendly tool in the form of Microsoft excel worksheet is to be generated to design a confined masonry wall. The study is aimed at determining the more economic construction between the unreinforced and confined masonry.

scholarly journals Influence of Constructional-Material Parameters on the Fire Properties of Electric Cables

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4569 ◽  
Author(s):  
Kaczorek-Chrobak ◽  
Fangrat
Keyword(s):  
Construction Material ◽  
Constructional Material ◽  
Standard Test ◽  
Fire Load ◽  
Material Parameters ◽  
Electric Cables ◽  
Fire Properties ◽  
Halogen Free ◽  
Electrical Cables ◽  
Relevant Factors

The significant number of cables of different materials and construction used extensively in building objects increases their fire load and, therefore, strongly influences safety in the case of fire. The purpose of the study was to identify relevant factors related to the construction of electrical cables, and perform a qualitative and quantitative assessment of their influence on specific fire properties, such as heat release and smoke production. Fifteen cables of different construction and materials were studied using the EN 50399 standard test. The analysis was focused on cable constructional-material parameters related to the chemical composition of non-metallic elements and the number and shape of conductors in the cable, as well as the concentric barrier as armor or the copper concentric conductor. The conclusions drawn from the experiments were: (1) Construction, the number of conductors, and the presence of armor or concentric metallic conductors improve the fire properties by forming a barrier against flame penetration through the cable; (2) the use of copper conductors resulted in a decrease of fire parameters compared to cables with aluminum conductors (peakHRRav parameter even four times lower for copper cable); (3) construction material based on non-plasticized poly(vinyl chloride) (PVC) significantly reduced the fire properties of cables more than halogen-free materials (LS0H) (peakHRRav parameter more than 17 times higher for the fully halogenated cable), which is due to the decomposition process of the material; and (4) no clear relationship between the fire parameters and the cable parameter, χ, was found.

Brick as a Construction Material in the Modernization Process of the Ottoman Architecture

2010 ◽  
Vol 133-134 ◽  
pp. 107-112
Author(s):  
Aynur Çiftçi ◽  
Uzay Yergün
Keyword(s):  
Industrial Revolution ◽  
Construction Material ◽  
Good Condition ◽  
Construction Materials ◽  
Steel Beams ◽  
Masonry Walls ◽  
Construction Technique ◽  
Local Product ◽  
Before And After ◽  
Ottoman Architecture

Brick used with stone in an alternate order -especially on monumental masonry buildings- is one of the basic construction materials in Ottoman classical architecture. Parallel to the announcement of Tanzimat Declaration (1839), to the political and economical relations improved with European states and to the Industrial Revolution in Europe, an effective change had been seen on design concept and construction techniques in Ottoman architecture. Many new buildings were built using modern materials and imported techniques such as solid brick (in western norms) masonry walls, steel beams at the horizontal and vertical bearers, cement and concrete. The product of modern solid bricks in western standards had been realized in Ottoman territories in the last quarter of 19th century. The base of this research is constituted on 334 imported and local product solid bricks which remain to Zihni Göğer’s (firstly documented for this research), to Uzay Yergün’s, to Aynur Çiftçi’s and to the Yıldız Techical University, Department of Architectural Conservation’s private collections. Most of the bricks are in a good condition, clean and have stamps. From the stamps one learns where they were produced, in which country or even city, the names of the plants, the logos and the dates of product. During the documentation every brick is numerated, photographed and a catalogue is prepared including the dimensions of the bricks. The demolotion of the buildings made of solid brick masonry walls-especially those which are not registered as an essential cultural asset- the interventions undertaken and the use of new materials during restoration of bearer walls have damaged the original bricks. Finally they were not conserved and documented. The aim of this paper is to determine the change of the production and the standarts of the bricks, to indicate their varieties, their fields of use and their conservation problems before and after the modernisation period of Ottoman architecture. It is intended to take into consideration the conservation and documentation of this material during renovations reflecting the original construction technique of the period that belongs to monumental and civil architecture.

The Construction Technique of Steel-Wood Composite Core Formwork in a Large Span Prestressed Hollow Box Guider

2014 ◽  
Vol 894 ◽  
pp. 18-21
Author(s):  
Jing Liang Yu
Keyword(s):  
Low Cost ◽  
Wood Composite ◽  
Construction Technique ◽  
Box Girder ◽  
Counter Measures ◽  
Large Span ◽  
Working Efficiency

Based on the comparison of several types of core formwork for large span hollow box girder, their structural characters, and assemble and disassemble in application is analysed to find that steel-wood core formwork is a better choice. Then the installation technique of steel-wood core formwork is discussed, including assemble, disassemble and anti-floating counter measures. The practice in some large span prestressed hollow box girder construction prove that steel-wood core formwork is a simple but effective core formwork construction technique with technological economic advantages because of its low cost, high working efficiency and better accuracy..

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