Ibrahim Almufti

Ibrahim Almufti
Arup | Arup · Advanced Technology + Research

About

33
Publications
16,980
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
475
Citations
Citations since 2016
15 Research Items
441 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (33)
Conference Paper
Full-text available
Existing-building seismic performance and collapse assessment methodologies used today are often either simplified screening-level procedures constrained by limited information and level of detail, or highly sophisticated numerical modeling procedures constrained by the computational costs of conducting comprehensive probabilistic analysis. In this...
Conference Paper
Earthquakes can cause extensive disruption to communities. One of the most consequential disruptions is loss of critical utility services, including electric power, water, natural gas, and sanitary sewer. To help communities understand the current risk of their utilities systems and move towards more resilient infrastructure, a probabilistic fault...
Conference Paper
Full-text available
In the aftermath of previous moderate to large earthquakes (e.g. Loma Prieta 1989, Northridge 1994, and Christchurch 2011), nearby university campuses (e.g. Stanford, California State University, and University of Canterbury) have experienced widespread building damage, disruption of lecture and research, and reduction of undergraduate and graduate...
Conference Paper
Full-text available
Recent earthquakes have demonstrated that the vertical component of ground motion can be damaging to building structural and nonstructural components. Recorded vertical accelerations from these recent earthquakes significantly exceed the vertical spectral demands used for seismic design prescribed in building codes in the United States. The focus o...
Conference Paper
Full-text available
Over the past decade, the earthquake engineering profession has made significant progress in developing models and tools for predicting loss of functionality and downtime in buildings, most notably the seismic performance assessment methodology for buildings (i.e., FEMA P-58) developed by the Federal Emergency Management Agency. While FEMA P-58 rep...
Conference Paper
Full-text available
In regions within high seismic risk, there exists a lack of awareness about the business interruption and financial loss following an earthquake. When a major earthquake strikes an urban region, the financial costs of demolition, repair and restoration of utilities are immense. Indirect losses due to downtime, business interruption, the loss of cul...
Conference Paper
Full-text available
This study was motivated by the observed amplifications of vertical ground motions in recent earthquakes and the need to improve our understanding of site response analysis (SRA) for vertical ground motions as a growing body of evidence suggests that vertical ground motions can play a key role in structural damage. This study attempts to evaluate t...
Chapter
Full-text available
The HayWired scenario examines a hypothetical earthquake (mainshock) with a moment magnitude (M w) of 7.0 occurring on April 18, 2018, at 4:18 p.m. on the Hayward Fault in the east bay part of California's San Francisco Bay area. The tall-building performance assessment for the scenario includes a structural analysis and downtime and loss estimates...
Conference Paper
Full-text available
Earthquake-induced loss of functionality and downtime in individual buildings can cause major economic and societal impacts, ranging from displacement of individual families and businesses to disruption of emergency medical services and government functions. The ability to predict recovery times for buildings after an earthquake is a critical compo...
Article
The increasing power of four-dimensional analysis tools and advanced soil models has facilitated performance-based design processes to be followed for foundations in highly seismic areas. Often more efficient foundation solutions result than would be achieved by direct application of codes. Particular care is required in the selection and scaling o...
Conference Paper
Full-text available
This paper presents a series of validation exercises for seismic site response analysis using the recordings from three well-instrumented, urban lakebed seismograph stations in Mexico City (CAO, SCT and TXS2). The dynamic behavior of Mexico City Clay has long been a topic of great interest among geo-seismic researchers due to the lack of consensus...
Conference Paper
The "rupture to rafters" approach combines advanced nonlinear soil and building models in a single analysis, representing the state-of-the-art for predicting the seismic performance of structures. This approach was utilized recently by Arup on several high profile projects around the world in order to better characterize soil-structure interaction...
Conference Paper
Full-text available
The REDi Rating System (v1.0) was published in late 2013 as a guideline for implementing “resilience-based earthquake design” to achieve “beyond code” resilience objectives in the design of new construction. Since its publication, the REDi guidelines have been incorporated into several RFP’s and have been adopted for the design of high-profile proj...
Conference Paper
Full-text available
Nonlinear ground response analyses are conducted for the 2007 Niigata-ken Chuetsu-oki earthquake recorded at a free-field vertical array near the Kashiwazaki-Kariwa Nuclear Power Plant in Japan. A soil column is built in LS-DYNA using three-dimensional elements which allow for multi-directional shaking analyses as well as user-defined stress-strain...
Poster
Full-text available
Effects of Multi-directional Shaking in Nonlinear Site Response Analysis: Case Study of 2007 Niigata-ken Chuetsu-okiEarthquake
Conference Paper
Several structure-soil-structure interaction analyses were recently conducted using the finite element program LS-DYNA to assess the interaction between the deep, long embedded trainbox of the Transbay Transit Center and the adjacent deep basement of the 245-meter high 181 Fremont Tower when subjected to bedrock-propagating ground motions. Key feat...
Article
Full-text available
A nonlinear ground response analysis is conducted for the Niigataken Chuetsu-oki earthquake recorded at a free-field vertical array near the Kashiwazaki-Kariwa Nuclear Power Plant in Japan. A bidirectional site response analysis is carried out using LS-DYNA which allows user defined stress-strain relationships to dictate soil behavior subjected to...
Conference Paper
Full-text available
This study presents the results of a risk-based seismic performance assessment of an archetype tall building representative of the existing tall building stock in San Francisco, CA. The archetype tall building, selected based on an inventory of existing tall buildings, is a 40- storey Moment Resisting Frame (MRF) representative of design and constr...
Article
In areas of high seismicity in the United States, the design of many existing tall buildings followed guidelines that do not provide an explicit understanding of performance during major earthquakes. This paper presents an assessment of the seismic performance of existing tall buildings and strategies for increased resilience for a case study city,...
Article
This study assesses the environmental impacts of an archetypical contemporary 42-story residential concrete building designed to meet minimum code requirements and compares it to the impacts from a "beyond code" design. The earthquake performance of the building in terms of financial loss and repair time was previously evaluated using a FEMA P-58 b...
Conference Paper
Full-text available
Tall buildings play an important role in the socio-economic activity of major metropolitan areas. The resilience of these structures is critical to ensure a successful recovery after major disasters. Events such as the Canterbury earthquake in 2011 have highlighted the impact of poor performing buildings on the business continuity of downtown distr...
Article
Site response analysis is a precursor to soil-structure interaction analysis, which is an essential component in the seismic analysis of safety-related nuclear structures. Output from site response analysis provides input to soil-structure interaction analysis. Current practice in calculating site response for safety-related nuclear applications ma...
Conference Paper
Full-text available
Lessons learned from designing against disproportionate collapse relevant to an international audience are discussed. Two structurally dissimilar buildings, designed against sudden column loss using two different methods of nonlinear alternate progressive collapse analysis, are selected for discussion. The first - a commercial, medium-rise office b...
Article
Full-text available
It can take many years to complete the construction of deep, wide and long excavations in urban environments. In seismically active areas, there is a finite probability that a significant earthquake could take place during the construction period. The designer and builder are confronted with the need not only to maintain control of ground and retai...
Article
Full-text available
The earthquake performance objective of national building codes for the vast majority of buildings is to provide "life-safety" for building occupants in design level earthquake shaking. The code accepts that damage to the building structure, architectural components and facades, mechanical/electrical/plumbing (MEP) equipment, pipes, ducts and build...
Article
Full-text available
Ground motions that contain velocity pulses may cause greater structural damage than ground motions that do not contain pulses. The effects of pulse-like motions are best approximated in the time domain using nonlinear response history analysis. Current approaches for incorporating pulse effects are not reproducible since they largely rely on engin...
Method
Full-text available
The REDi guidelines provide owners, architects and engineers a framework for resilience-based earthquake design to achieve "beyond-code" resilience objectives..
Conference Paper
The Vegas High Roller is a 550-foot-tall rotating observation wheel under construction in Las Vegas. It has 28 cabins, each capable of carrying 40 passengers. The efficient, lightweight structure and low natural frequencies render it susceptible to wind-induced vibrations. Spectral-based predictions show that many modes with natural frequencies bet...
Conference Paper
Structural fire engineering (SFE) is a growing field of performance-based design where the required level of fire resistance, amount and location of fire protection material ("fire proofing") and structural detailing can be specifically tailored based on the response of the actual structure under realistic fire scenarios. While current practice in...
Conference Paper
Full-text available
LS-DYNA is a versatile non-linear dynamic analysis platform with a large library of material models and element formulations suitable for computationally intensive time-domain multi-physics simulation. Powerful graphical interfaces are available for visualization. The owner and developer of LS-DYNA is Livermore Software Technology Corporation (LSTC...

Network

Cited By

Projects

Project (1)
Project
REDi aims to transform the way resilience is measured and implemented in the built environment and to lower the barrier to entry for owners, developers, architects, and engineers to achieve resilience.