Two new skyscrapers in Dallas skyline
The Dallas skyline could see some big changes soon with the Dallas City Council’s approval of two new skyscraper construction projects. One will be built just north of Downtown Dallas near the Perot...
Keller's KELLER Grouting and Ground Improvement Course begins at 01 Aug 2022
Keller's KELLER Grouting and Ground Improvement Course begins at 01 Aug 2022
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Latest News
India, Mumbai: Building collapse – at least 3 fatalities and 11 injuries
At least three people were killed and 11 were injured when a dilapidated residential building collapsed in India's financial and entertainment capital, Mumbai, officials said Tuesday. The four-stor...
Bangladesh: opening of country's longest bridge
Bangladesh’s Prime Minister Sheikh Hasina on Saturday celebrated the opening of the country’s longest bridge, which took eight years to build. The 6.51-kilometer (4.04-mile) bridge spanning the Pad...
6.1-magnitude earthquake in Afghanistan: At least 1,000 fatalities and 1,500 injuries
A powerful earthquake has killed at least 1,000 people and injured 1,500 in eastern Afghanistan, an official of the ruling Taliban told the BBC. The quake struck shortly after 01:30 (21:00 GMT Tuesda...
Cairo, Egypt: Building collapse, at least six fatalities
A five-story building in Egypt’s capital Cairo collapsed in the early hours of Friday killing at least six people, Al Arabiya’s correspondent reported. The incident also resulted in the partial colla...
Industry Section
Shoring project at Base Mine Lake
As a previous mine pit and tailings pond, the Base Mine Lake has residual bitumen forming two mats on the lake floor. Keller designed and installed a shoring solution to create a new dock area for dr...
Keller North America announces new branch and area managers
Ray Franz was promoted to Area Manager of Northern California. With over 30 years of experience in geotechnical consulting and specialty construction, Ray has worked with micropiles, auger cast piles,...
Alameda Marina Ground Improvement Project Wins the 2022 CalGeo Outstanding Project award
Keller’s ground improvement work wins the 2022 CalGeo Outstanding Project award. In 1916, marshlands along the Oakland Estuary in San Francisco were filled in to create the Alameda Marina. During W...
Miami 6-Arch Signature Bridge Auger Cast Pile Solution
Keller installs auger cast piles for the first FDOT project in over half a century, supporting a new bridge in Miami. The project As part of road enhancements along the I-395 string from the Midtow...
Osito Canyon Landslide Stabilization Project
Slide events are common in Osito Canyon in the Angeles National Forest. During heavy rains in 2005 , an approximately 900 ft long landslide occurred along the historic Old Ridge Route overlooking the...
Editor's Pick
Concrete Buildings as Rechargeable Batteries
The energy that comes from the wind and the sun as a renewable source has become a growing necessity. As a result, new ideas about rechargeable batteries have gained ground to capture these intermitt...
Upcoming Events
KELLER Grouting and Ground Improvement Course
Grouting and Ground Improvement is a 4-day course that covers engineering, equipment, materials, and methods for grouting and ground modification used in civil and geotechnical engineering, undergrou...
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Publications
An innovative low damage seismic solution for unreinforced clay brick infill walls Pounding effects during an earthquake, with and without consideration of soil-structure interaction A reconnaissance report on two Iran, Makran Earthquakes Seismic retrofitting solution of an adobe masonry wall Cyclic testing and comparison of locally CFRP confined HSS braces and buckling-restrained braces A multimode pushover procedure for asymmetric buildings under bidirectional ground motion Mechanical properties of brick masonry with different types of bonds Framework for developing fragility relations of high-rise RC wall buildings based on verified modelling approach Relative safety margins of code-conforming vertically irregular high-rise buildings Performance based evaluation and design of reinforced concrete frames with strong masonry infill
Education
Beams: maximum moment
Find the maximum moment of the above beam which is subjected to triangular vertical load. SOLUTION: ΣΜΒ = 0 → ΑΥ –(1/2)ql(l/3)=0 → ΑΥ = (1/6)ql ΣFY = 0 → ql/6 + BΥ –(1/2)ql=0 → BΥ = (1/3)ql Assum...
Column in buckling
Consider a universal column 200mm x 200mm with a flange thickness of 10mm and web thickness of 7mm. The height of the column, which is fixed in concrete at its base, is 10m and the load is applied...
Maximum Factored Vertical Shear
A simply supported beam (Figure) with a span of L=20ft is subjected to a uniform service load of 1200 lb/ft, including self weight, and a live load of 900 lb/ft. Determine the maximum factored...
Flexular Crack in Concrete Beam
For the simply supported beam of Figure 1, determine the uniformly distributed load, q, at which the flexural crack forms. The beam has a length L=7m, and f’c=25Mpa. Figure 1: Cross-section of Con...
Calculate the vertical deflection of a beam
Calculate the vertical deflection of the beam (magnitude and direction) at the midpoint of the central span (point A) Solution Use virtual work method: Virtual Structure From Equilibrium: Shea...
Truss vs Cable
Truss and cable elements are defined by their ability to carry solely axial loads. Nonetheless, since cables have no stiffness when loaded in compression, they function only in tension. Moreover,...
Spring Assemblies in Series/Parallel: Two Springs in Series
Based on Figure 1, we get: where: In matrix form, the above can be re-written as: Example Figure 2: Two Springs in Series - Example Calculate k1, δ2, and f3. Solution Ba...
Books
Structural Engineering Solved Problems
Structural Engineering Solved Problems contains 100 practice problems representing a broad range of topics on the Structural Engineering (SE) and Civil PE exams. Each problem provides an opportunity t...
Structural Depth Reference Manual for the Civil PE Exam, Fourth Edition
The Structural Depth Reference Manual prepares you for the structural depth section of the Civil PE exam. It provides a concise, yet comprehensive review of the structural depth section exam topics an...
Structural Depth Practice Exams for the Civil PE Exam
Structural Depth Practice Exams contains two 40-problem, multiple-choice exams consistent with the NCEES Civil PE structural depth exam's format and specifications. Like the actual exam, the problems...