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A comparison of IBC with 1997 UBC for modal response spectrum analysis in standard-occupancy buildings

Earthquake Engineering and Engineering Vibration 2011年第1期10卷 99-113页

作者： Tariq M. Nahhas Umm Al-Qura University

This paper presents a comparison of the seismic forces generated from a Modal Response Spectrum Analysis （MRSA） by applying the provisions of two building codes, the 1997 Uniform building Code （UBC） and the 2000-2009 International building Code （IBC）, to the most common ordinary residential buildings of standard occupancy. Considering IBC as the state of the art benchmark code, the primary concern is the safety of buildings designed using the UBC as compared to those designed using the IBC. A sample of four buildings with different layouts and heights was used for this comparison. Each of these buildings was assumed to be located at four different geographical sample locations arbitrarily selected to represent various earthquake zones on a seismic map of the USA, and was subjected to code-compliant response spectrum analyses for all sample locations and for five different soil types at each location. Response spectrum analysis was performed using the ETABS software package. For all the cases investigated, the UBC was found to be significantly more conservative than the IBC. The UBC design response spectra have higher spectral accelerations, and as a result, the response spectrum analysis provided a much higher base shear and moment in the structural members as compared to the IBC. The conclusion is that ordinary office and residential buildings designed using UBC 1997 are considered to be overdesigned, and therefore they are quite safe even according to the IBC provisions.

关键词： response spectrum analysis seismic forces multi-story buildings seismic design building codes IBC UBC

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Convergent Agency:Encouraging Transdisciplinary Approaches for Effective Climate Change Adaptation and Disaster Risk Reduction

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International Journal of Disaster Risk Science 2016年第4期7卷 430-435页

作者： América Bendito Edmundo Barrios Department of Civil Engineering Universidad de Los Andes World Agroforestry Centre(ICRAF)

Three recent global agreements have been established to facilitate the implementation of global-level responsibilities to deal with disaster risk reduction(DRR),human development,and climate change adaptation(CCA)*** these agreements have a common goal of reducing social,economic,and environmental vulnerability,they have been developed by largely independent communities of *** has limited cross-fertilization despite the inherent multidimensional nature of global challenges and the considerable thematic *** argue that developing a transdisciplinary strategy that effectively integrates disciplines,approaches,and knowledge systems will lead to greater and more sustainable impacts,together with a more efficient use of financial *** approaches should be encouraged during planning of future development efforts so that risk reduction is conducted simultaneously with *** processes are central to generating contextsensitive knowledge to support decisions on CCA and DRR options that minimize trade-offs and maximize synergies and complementarities required to guide sustainable development ***,building codes together with climate and risk-smart research,education,and awareness raising,are identified as priority entry points to materialize the blending of DRR and CCA approaches and effectively reduce risk while mitigating and adapting to climate change.

关键词： building codes Climate change adaptation Disaster risk reduction Sustainable development goals Transdisciplinary knowledge

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MECHANICAL INSULATION CASE STUDY-TIMELY OPPORTUNITY FOR RETROFITS AND NEW CONSTRUCTION

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Journal of Green building 2012年第2期7卷 3-14页

作者： Micah Lang Bud Fraser Jeff Besant HB Lanarc-Golder in Vancouver BC Besant and Associates Engineers Ltd.in Vancouver BC

INTRODUCTION“You won’t find any issues in our newly constructed and retrofitted buildings,”was the response that Lyndon Johnson,representative of the BC Insulators,got from the campus facility manager when explaining the poor state of practice of mechanical insulation,“let me show you one of our showcase buildings.”The building in question had just undergone$80 million in upgrades and was designed to achieve LEED®Silver equivalent *** upgrades included a high-performance climate control system that allows for precise control of temperature and humidity in different rooms.“We toured the building and found many problems with the mechanical insulation,”explained *** afterwards,“including substandard finish,adhesive tape lifting,and most disturbing,20 feet of missing insulation on each floor of the building along the dividing line of the two phases of the *** or both sets of contractors that worked on the job had completely left off the *** saddest part is,this didn’t surprise me given what we know about the state of the industry today.”

关键词： mechanical insulation building retrofits new construction energy savings building codes building energy modelling

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