News Article | April 17, 2017
The City of Santa Monica’s adoption Tuesday of the nation’s most comprehensive earthquake retrofit ordinance is likely to launch a new series of earthquake retrofit laws throughout the state, Optimum Seismic, Inc. Principal Ali Sahabi advises in commentary published this week by the California Apartment Association. His article, “A New Frontier Launched for Earthquake Safety,” is reprinted below, with permission from the California Apartment Association. To view the article, visit https://caanet.org/new-frontier-launched-earthquake-safety/. Earthquakes are not selective about where and when they strike and they are equally as indiscriminate on the types of buildings they can rattle to the ground. While it is true that some structures may be more prone to damage than others, the reality is that virtually all buildings have the capacity to fail in a major quake. Recognizing that, many cities throughout the state are kicking off new laws requiring retrofits of various types of buildings – a phenomenon the Los Angeles Times recently proclaimed as the start of a “New Frontier” for earthquake safety. The city of Santa Monica this week took the lead on what is becoming a new wave of more comprehensive laws to cover not only soft-story and non-ductile buildings, but others as well. Santa Monica’s law, adopted on Tuesday, is much more thorough than the ordinance enacted in 2015 by the city of L.A. and the 2013 law adopted by San Francisco. Even more notable is the fact that there are untold numbers of cities poised to do the same. It’s only a matter of time. Famed seismologist Dr. Lucy Jones told the Times it is remarkable to see how the political winds have changed for elected officials considering seismic retrofit laws. “There are dozens of cities curious at looking at this,” she said. “People are starting to recognize how necessary this is.” The City of Los Angeles retrofit law, which took effect last year, requires the stabilization of some 15,000 pre-1978 wood-frame, soft-story buildings and non-ductile concrete buildings. Soft-story structures have parking or open space on the ground floor, and apartment or office units built above. Non-ductile buildings are pre-1977 concrete structures with a roof and/or floor supported by a concrete wall or concrete column. A couple of years earlier, San Francisco adopted a similar law affecting some 2,800 buildings that are home to 58,000 people and 2,000 businesses. San Francisco officials, at the time the law was passed, estimated that up to 85 percent of those soft-story buildings would fail and be tagged as “unsafe” following a magnitude 7.2 quake. Berkeley and other Bay Area cities adopted similar ordinances about the same time. Santa Monica’s ordinance applies to not one or two, but five different building types: These buildings must all be retrofitted in 2 to 20 years, depending on the type of structure. Single-family homes are also strongly encouraged to undergo retrofits, but that is strictly voluntary at this time. “There is no greater responsibility of government than public safety,” Building and Safety Director David Martin said in his report to the City Council. “…Although Santa Monica adopted mandatory Seismic Retrofit standards in 1991, many buildings continue to be at risk and it is necessary to update these standards and establish a program to ensure compliance.” The city went so far as to design a map that showed all geological faults in the city and identified structures on the map that may require retrofits under the new law. It may be just a matter of time before your city does the same. Ali Sahabi has been a licensed General Engineering Contractor (GEC) since 1993, and is a principal at Optimum Seismic, Inc. He has completed hundreds of seismic retrofitting and adaptive reuse projects for multifamily residential, commercial, and industrial buildings throughout California.
News Article | February 22, 2017
Koch General Engineering is set to launch after recently incorporating. Koch General Engineering is a San Diego-based small business that focuses on public works, residential and commercial construction. “We provide top-quality asphalt and concrete service,” said Jeffrey Briggs, co-owner of Koch General Engineering. Services include asphalt slurry work, freeway paving, ADA-compliance paving, grading, concrete paving, asphalt patching and more. The mission of Koch General Engineering is to exceed its customer’s expectations. “We partner with our customers in government and industry to provide engineering and construction solutions that enhance the delivery and quality of the projects we do in the communities in which we serve,” said Monty Koch, Operating Managing Owner of Koch General Engineering and a third-generation contractor. Koch began his career working for his father’s company, washing dump trucks and working his way through the ranks as a laborer, bridge carpenter, operating engineer, plant mechanic, asphalt foreman and general superintendent for several prominent San Diego construction companies. He later became the Responsible Managing Owner for Koch-Armstrong, a General Engineering Company that operated for the last 18 years. “The marriage of field and estimating expertise allows Koch General to provide a wide range of resources and the knowledge needed to complete all facets of any project,” concluded Briggs. “Monty and our other foremen have supervised jobs for clientele including public/government agencies as well as private entities ranging from small backyard jobs to huge commercial and public works projects.” About Koch General Engineering Koch General Engineering specializes in irrigation, drainage, water power, water supply, flood control, river control and reclamation works, highways, streets and roads, parks, playgrounds and other recreational works, land leveling and earthmoving projects, excavating, grading, trenching, synthetic turf field, horse racing tracks and paving. It mainly performs work in the County of San Diego, but does venture into surrounding areas. Koch General Engineering is the only experienced local contractor to place central Mix REAS (Rubberized Emulsion Asphalt Slurry). For more information, please call (619) 561-2005, or visit http://www.kochge.com. About the NALA™ The NALA offers small and medium-sized businesses effective ways to reach customers through new media. As a single-agency source, the NALA helps businesses flourish in their local community. The NALA’s mission is to promote a business’ relevant and newsworthy events and achievements, both online and through traditional media. For media inquiries, please call 805.650.6121, ext. 361.
Thatte M.,Bharati Vidyapeeth Medical College |
Vaze D.,General Engineering Company
African Journal of Paediatric Surgery | Year: 2014
Pancreaticoduodenal injuries are rare in children. They pose challenges for the treating surgeon in decision making with respect to diagnosis, surgical and post-surgical management. The management plan must be tailored to the nature and severity of trauma, patient profile, surgeon′s expertise and the resources available at surgeon′s disposal. We describe a pancreaticoduodenal injury in 3-year-old child with successful outcome and follow-up of a decade.
Al-Ahmar R.,General Engineering Company |
Al-Samara M.,Damascus University
International Journal of Structural Engineering | Year: 2015
Many countries still adopt the seismic design approach in UBC97 for RC special moment-resisting frame buildings (SMRFs), which suggests a fixed value of the seismic response modification factor R of 8.5 for all types of SMRFs. This paper investigates, using two case studies comprising 25 numerical analyses, the R factor for SMRFs by performing pushover analysis and focusing on the effect of the number and span of bays and the number of stories. The analysis results show that the R factor is significantly dependent on the number of stories in which it decreases with the increase in the number of stories. Conversely, the number and length of bays had insignificant effect on R in comparison to the number of stories. The calculated R values range from 5 to 12. Thus, the results suggest that the use of a fixed value for R could result in unsafe or uneconomic building designs. Copyright © 2015 Inderscience Enterprises Ltd.
Li Z.-Y.,General Engineering Company
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2015
Based on transverse integration discrete ordinate equation, the relationship between transverse integrated outgoing and incoming flux was analytically obtained in this paper, and with transport nodal neutron balance equation analog to nodal diffusion method, an effective nodal discrete ordinate numerical iteration strategy was obtained. Numerical results indicate that the method given in this paper is feasible and the results are reliable. In addition, the widely used coarse mesh finite difference (CMFD) acceleration technique is adopted in nodal discrete ordinate method and provides good result. ©, 2015, Atomic Energy Press. All right reserved.
Li Z.-Y.,General Engineering Company
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014
Nodal method is widespread used in reactor core diffusion code, but as nodal method adopting coarse mesh in order to speedup calculation, so it causes cusping effect. Cusping effect would affect some reactor core diffusion relevant calculation result. In this paper, the partial inserted rod intro-node cross section in nodal method transverse integration equation was explicitly represented, i.e. node axial position dependent cross section step function was introduced. Numerical results indicate the method greatly improves the control rod differential worth deviation of cusping effect, in particular nearly completely eliminates the control rod relevant kinetic problem's deviation of this effect. ©, 2014, Atomic Energy Press. All right reserved.
Xiao B.,Worcester Polytechnic Institute |
Wang Q.,General Engineering Company |
Wang G.,Worcester Polytechnic Institute |
Sisson Jr. R.D.,Worcester Polytechnic Institute |
Rong Y.,Worcester Polytechnic Institute
Applied Thermal Engineering | Year: 2010
To predict the microstructures, residual stresses and distortions in the heat treated metal components, it is important to accurately know the heat transfer coefficients (HTCs) between the hot work piece and cooling media. In this paper, a new method is presented to accurately determine the node-based HTC distribution by coupling computational fluid dynamics (CFD) with optimal weight functions and scale factors. With this new method, the predicted temperature profile of the work piece during quenching (rapid cooling) is in excellent agreement with experimental measurements. This new method can be also applied to accurately predict convection heat transfer in thermal equipment such as heat exchangers and refrigerators, building thermal design and other heat transfer related situations. © 2010 Elsevier Ltd. All rights reserved.
Fu G.-W.,General Engineering Company
Petrochemical Equipment | Year: 2011
A residue hydrogenation reactor has the characteristic of high temperature, high pressure and hydrogen service. The safe and stable operation of the system is directly effected by sealing quality of the manhole flange. The main points of the manhole flange installation for the residue hydrogenation reactor have been summarized by the theory analysis and practical operation.
Mammeri M.,General Engineering Company |
Dhuicq B.,General Engineering Company
2013 IEEE Grenoble Conference PowerTech, POWERTECH 2013 | Year: 2013
The paper presents the challenges of the construction of extra-long high power underground cable transmission lines. Economical approach has pushed to increase cable lengths per shipping drum; the technical obstacles to be overcome and the performances required as a result of the increase in potential stresses applied to the screen insulation are shown. Different novelties in bonding diagram such as 'direct cross bonding' are explained, highlighting their benefit as well as their prerequisites and drawbacks. The use of longer shipping lengths as well as of 'direct cross bonding' method supposes that an accurate and thorough study of the electrical stress applied to joint shield break is carried out as part of the basic design of the link. The authors give practical experience with direct cross bonding. The increasing use of VSC (Voltage Source Converter) Technology is encouraging the use of synthetic insulated cables and both long submarine and underground links are being considered and actively implemented. Space charge formation under d.c. stress is certainly the major concern. A successfully test qualifications according to CIGRE recommendations TB 219 and currently to TB 496 have been performed on a full cable system. The tests were conducted for a nominal voltage U= 320 kV. © 2013 IEEE.