Civil Engineering

The main objects of surveying are to determine the relative positions of points on the Earth's surface and to measure distances, angles, and elevations accurately. The basic principles of surveying involve understanding and applying concepts like accuracy, precision, measurements of distances and angles, leveling, and use of surveying instruments to gather data for mapping and construction projects. It is essential to follow standardized procedures and techniques to ensure reliable and consistent results in surveying work.

1560 Kg/M3

not always the answer like this

i have made experiment , and it show to me that the denisty is 14635 kg⁄m3

for dry ,,,, and 14867.7 kg⁄m3 for wet

thanks,,,, eng.moh elnajjar

In most types of Surveying the ruling principles is to work from whole to part. This is fairly extensive Surveying such as those of large scale estate or town, the first thing to be done is to establish a system of control points. The position of these are established with a fairly high standard of accuracy but between them the work may be done by less and subsequently by less extensive methods.

In reinforced concrete construction, the modular ratio refers to the modulus of elasticity of concrete to that of steel. It is used in structural design calculations to determine distribution of stresses between concrete and steel in beams and columns.

Engineers play a crucial role in nation-building across various sectors, contributing to economic development, infrastructure improvement, technological innovation, and social progress. Here are some key roles that engineers fulfill in the process of nation-building:

1. Infrastructure Development:

• Engineers are responsible for designing, planning, and constructing critical infrastructure such as roads, bridges, railways, airports, ports, water supply systems, and energy networks.

• By building and maintaining infrastructure, engineers facilitate economic growth, enhance connectivity, and improve the quality of life for citizens.

2. Urban Planning and Development:

• Urban planners and civil engineers collaborate to design sustainable and resilient cities that can accommodate population growth, manage resources efficiently, and mitigate environmental impacts.

• Engineers play a crucial role in developing smart cities, integrating technology and data-driven solutions to enhance urban mobility, energy efficiency, and environmental sustainability.

3. Water Resource Management:

• Engineers design and implement water supply systems, wastewater treatment plants, irrigation networks, and flood control measures to ensure sustainable management of water resources.

• By improving access to clean water and sanitation, engineers contribute to public health, environmental conservation, and socioeconomic development.

4. Energy Production and Distribution:

• Engineers work in the energy sector to develop and maintain power generation facilities, transmission lines, and distribution networks.

• Through innovation in renewable energy technologies, such as solar, wind, and hydroelectric power, engineers help reduce reliance on fossil fuels, mitigate climate change, and promote energy security.

5. Environmental Conservation and Sustainability:

• Environmental engineers and scientists collaborate to address environmental challenges such as pollution, deforestation, habitat destruction, and climate change.

• Engineers develop technologies and strategies for environmental remediation, waste management, recycling, and sustainable land use practices to protect natural resources and ecosystems.

6. Transportation and Mobility:

• Engineers design and optimize transportation systems, including roads, railways, airports, and public transit networks, to improve mobility and accessibility.

• Through innovations such as electric vehicles, autonomous vehicles, and high-speed rail, engineers contribute to safer, more efficient, and environmentally friendly transportation solutions.

7. Technological Innovation and Research:

• Engineers drive technological innovation and research across various fields, including aerospace, telecommunications, information technology, biotechnology, and materials science.

• By pushing the boundaries of knowledge and developing new technologies, engineers stimulate economic growth, create jobs, and enhance national competitiveness on the global stage.

8. Disaster Preparedness and Response:

• Engineers play a critical role in disaster risk reduction, preparedness, and response efforts, helping communities build resilience to natural and man-made disasters.

• Through hazard mapping, structural design, early warning systems, and emergency infrastructure, engineers save lives, minimize property damage, and support recovery efforts in times of crisis.

In summary, engineers are instrumental in nation-building by designing, building, and maintaining essential infrastructure, advancing technology and innovation, promoting sustainability and resilience, and addressing societal challenges. Their expertise and contributions are essential for driving economic growth, improving quality of life, and building a better future for generations to come.

There is a rumor and says that Civil Engineering was the toughest coarse Compare with all engineering, Medical course, MBA, Architecture, BA, and other courses. Not quite sure about that. Havent check it in the guiness record.

The Three Gorges Dam is Asia's biggest dam, located on the Yangtze River in China. It is the world's largest hydroelectric power station in terms of installed capacity.

Gold mines in South Africa go a few kilometers below the surface. The deepest mine at the moment is the Mponeng Mine in the Orange Free State. The depth of the mine is well over 3000m from the surface and is getting deeper. The lift itself decends 3037m to a point 1200m below sea level. It takes 4 minutes.

For Mild Steel Bars:

Diameter (in inches): 1/4" Weight per foot: 0.167 lb/ft Diameter (in inches): 3/8" Weight per foot: 0.376 lb/ft Diameter (in inches): 1/2" Weight per foot: 0.668 lb/ft Diameter (in inches): 5/8" Weight per foot: 1.043 lb/ft Diameter (in inches): 3/4" Weight per foot: 1.502 lb/ft Diameter (in inches): 1" Weight per foot: 2.670 lb/ft For High-Strength Deformed (HSD) Steel Bars (commonly used in construction):

Diameter (in millimeters): 8 mm Weight per meter: 0.395 kg/m Diameter (in millimeters): 10 mm Weight per meter: 0.617 kg/m Diameter (in millimeters): 12 mm Weight per meter: 0.888 kg/m Diameter (in millimeters): 16 mm Weight per meter: 1.579 kg/m Diameter (in millimeters): 20 mm Weight per meter: 2.467 kg/m Diameter (in millimeters): 25 mm Weight per meter: 3.853 kg/m

TMT stands for Thermo Mechanically Treated steel. Thermo mechanically treated steel known as TMT steel can be described as a new-generation-high-strength steel having superior properties such as weldability, strength, ductility and bendability meeting highest quality standards at international level.

In IS 1786-2008 Clause no.4.2 , Chemical Composition and Table 3, Mechanical Properties of High Strength Deformed Bars and Wires the difference between TMT 500 and 500 d is clearly mentioned.

TMT (Thermo-Mechanically Treated) steel bars are available in various grades, each designed to meet specific performance requirements and applications in construction. The selection of the appropriate grade depends on factors such as structural design, load-bearing capacity, environmental conditions, and building codes. Some of the common grades of TMT steel bars include:

1. Fe-415: This grade of TMT bar is one of the most widely used and suitable for general construction purposes. The "Fe" stands for iron, while "415" denotes the minimum yield strength of the bar in megapascals (MPa). Fe-415 TMT bars offer adequate strength and ductility for residential and commercial buildings.

2. Fe-500: TMT bars with a grade of Fe-500 possess higher tensile strength compared to Fe-415 bars, making them suitable for structures subjected to heavier loads and seismic forces. These bars are commonly used in high-rise buildings, bridges, and infrastructure projects where enhanced strength is required.

3. Fe-550: TMT bars of Fe-550 grade offer even higher tensile strength and superior ductility, making them ideal for applications demanding greater structural integrity and resistance to dynamic loads. Fe-550 bars are commonly used in industrial structures, power plants, and heavy infrastructure projects.

4. Fe-600: This grade of TMT bar provides the highest level of tensile strength and ductility among commonly available grades. Fe-600 bars are utilized in specialized applications where exceptional structural performance is paramount, such as in pre-stressed concrete structures and high-rise buildings in seismic zones.

5. Corrosion-Resistant (CRS) TMT Bars: In addition to standard grades, corrosion-resistant TMT bars are also available to mitigate the effects of corrosion in aggressive environments such as coastal areas or industrial settings. These bars are specially designed with added corrosion-resistant elements such as copper, chromium, or zinc to enhance their longevity and durability.

It's essential for builders, engineers, and contractors to carefully evaluate the requirements of their construction projects and select the appropriate grade of TMT bars to ensure optimal performance, durability, and structural safety. Additionally, adherence to relevant national and international standards and codes is imperative when specifying TMT steel bars for construction applications.

Shear force is a load (pounds, or newtons) in plane of the object which produces shear stress ( pounds per sq inch, or Pascals).

Shear force is related to shear stress as

STRESS = FORCE/AREA

efficency of crane shovel families

Very tall tower cranes use the self-jacking section of the mast to remove one mast section at a time. Once the main boom is near ground, a conventional crane removes the main boom and counter weights in sequence. Small tower cranes are removed without using the self jacking section by a conventional crane. In rare cases, stiff leg derricks and evenhelicopters can be used.

I think to dismantle the tower crane should do these works as follows:
1, under normal conditions, will be lifting Gan parallel to the building facades, removal of tower structure using the standard bottle top section, so that gradually the small drop tower, down procedures top-up procedures for the opposite. Until the tower fell to the initial installation height,then with crane tower crane to install according to the order of removal of the opposite.
2, in the unusual circumstances, such as the tower fell to the initial installation of a high degree of obstructions can not let the boom down when the order of installation, can be used cranes, lifting arm in the air will be divided into 2 ~ 3 removed but there must be a reliable security measures.
3, shaft independent drop tower method. France to adapt to the independent drop tower tower crane installed in the concave on the inside corner of the construction location, due to boom can not continue to decline in the tower on the roof, when lifting arm can be fitted with hinged Department - Auxiliary lifting equipment This would allow the tower continues to fall as well as removal of attached devices so on. Tower in the process of falling down all the parts removed from the auxiliary lifting equipment transported to the ground, until reduced to the initial installation height, in accordance with crane installed in reverse order followed by demolition.
The information are from jinan "huiyou"construction hosit company, http://www.towercraneofchina.com/xwzx4.asp?code=wz0000000000022this web has more information , you can go to have a look!

If SLI is in operating condition then sLI itself will indicates that whether load is in safe mode. But if SLI is not working then one must be considered 40 % factor of safety of crane SWL and in SLI working condition it will be considered 20 % of its SWL.

209000

Derrick crane, derrick, hoist, Scotch crane, jib crane

This link has civil engineering jobs and recruitment in Gurgaon http://www.indeed.co.in/Civil-Engineer-jobs-in-Gurgaon,-Haryana.

i am apply for civil engineering in 3 years diploma

30-100 Gpa (in compression)

is a cost effective, lightweight, modular deck system that lends itself to rapid construction

Of course, many engineers in various fields do so to improve their chances of promotion to management.

Shear strength measures the ability of a fastener to withstand a load at right angles to the axis of the fixing connection . Tensile strength measures the ability of a fastener to withstand a force along its axis