From buildings to bridges — highways to hydro plants — critical infrastructure must be built to last. Whether you need design expertise on the front end of a construction project or an accurate end-of-life assessment, Structural Integrity offers creative solutions to high-stakes infrastructure issues. With decades of experience and unmatched engineering expertise, we make integrity the foundation of every project.
Unique client requirements and architectural features tend to drive structural and seismic design of building systems — adding to the complexity. The more complex the design, the greater the need to scrutinize and measure the structure’s ability to withstand various loads. Clients from around the world count on Structural Integrity for in-depth design oversight and evaluations that put integrity to the test. From seismic retrofit evaluations to materials analyses, our meticulous approach and engineering expertise offer the assurance owners need.
The South Mesa Club building is a 50,241 sq. ft. one story structure on the Camp Pendleton Naval base. The Design-Build project consisted in the upgrade of building systems including the seismic investigation and retrofit of structural and non-structural components in accordance to present codes including ASCE 31 and ASCE 41. Structural Integrity developed the pre-bid ideas for the winning non-invasive seismic retrofit solution. Ideas were presented to the Naval Facilities Engineering Command and the Marine Corps with general schematic images of the proposed strengthening system in color coded isometric views and renderings. The structural design consisting of perimeter concrete shear walls and roof strengthening is in its final stages with construction scheduled summer of 2012.
Structural Integrity was hired by multiple clients to evaluate structural damage and repairs of four structures, which were damaged in the series of 2010-2011 earthquakes, located in the central business district of Christchurch, New Zealand.
SI completed a thorough structural assessment of the buildings documenting visual damage, permanent deformation, detailing, failed elements and a number of other structural concerns. They also provided a scope of repair and retrofit of the damaged structures to bring them back to an appropriate level of life safety and serviceability. Then developed a new design based on current code and performance requirements including use of Revit Structures.
When pressure retaining components must be designed to satisfy challenging service requirements, Structural Integrity offers the expertise to meet unique operational needs. From design to operation, our industry-leading experts specialize in maximizing the usable life of infrastructure, while minimizing risk.
Structural Integrity Associates, Inc. offers fully integrated engineering solutions to the High Pressure Industry, including high pressure vessels, piping and fittings. This includes a full cradle-to-grave approach which includes design, engineering, inspection, third party oversight, fitness-for-service, and life management for all types of high pressure equipment. Our Services include:
With market demand for the design, fitness-for-service, asset management and inspection of pressure equipment, Structural Integrity has been active in providing high quality, timely and cost-effective engineering services to fabricators and user’s. Our wide range of quality engineering services to support our clients include:
Deepwater operations are challenging the industry to develop Well Completion and Well Control Equipment that handle the conditions associated with High Pressure and/or High Temperature (HPHT) Environments. The technical challenges associated with pressure ratings greater than 15,000 psi or temperature ratings greater than 350°F, and the absence of code guidance, require operators to submit an engineering based approach that demonstrates the completion and other well control equipment, including SSSV’s, are capable of performing in the applicable HPHT environment. Structural Integrity has a full range of technical services to provide the engineering guidance in these environments.
Protective design has never been more necessary than it is today. Structural Integrity brings multidisciplinary expertise and the holistic approach needed to effectively protect critical infrastructures and equipment from the threat of an explosion or missile impact. As leading experts in mechanics, dynamics, and blast and impact criteria, we can ensure the inherent strength and protection of your structure. We offer a wide range of services designed to identify potential vulnerabilities and mitigation measures — and deliver peace of mind.
Structural Integrity’s staff provided anti-terrorism force protection design services in support of the design-build construction of two facilities at Naval Air Station Whidbey Island: an existing building being renovated into an MTOC (Mobile Tactical Operations Center) facility and a new TOC (Tactical Operations Center) facility. Services included evaluation of the façades, roof, windows and doors of both buildings for resistance to blast loads.
This project assessed the damage and potential threat to the bridge structure due to a bomb blast adjacent to the bridge's abutments, supporting truss, and hangers. Structural Integrity performed analytical simulations of multiple charges and associated blasts that created train derailment and damage. Bomb blast mitigation measures and bridge damage repair costs were prepared for this client.
Services designed to deliver
Structural Integrity's staff was asked to evaluate the risk and potential structural response of several subterranean columns exposed to a large “close-in” explosive charge. The columns supported a 40-story high-rise building above ground and any failure could result in progressive collapse. In addition, the building collapse would most likely cause a sequential collapse of the nearby mass transit tunnel. This catastrophic event prompted the building owner and Mass Transit authority to evaluate the blast threats. SI staff built detailed three-dimensional finite element models using LS-DYNA to quantify the potential damage and looked at retrofit options to mitigate a structural failure.
This project simulated a blast loading in an underground passenger train tunnel with shock physical code coupled to structural code including fluid structure interaction.
Because they provide critical, around-the-clock care, hospitals and healthcare facilities demand an added level of care in their design. Structural Integrity specializes in the rigorous design and evaluation of healthcare facilities throughout the U.S., including significant experience with the California Office of Statewide Health Planning & Development. We thrive at developing solutions that easily clear regulatory hurdles, so these critical facilities can keep their doors open — even when disaster strikes.
The Los Angeles County Department of Public Works renovated the Martin Luther King, Jr. (MLK) Medical Center. The project includes renovation of the Inpatient Tower and construction of a new Multi-service Ambulatory Care Center building.
Structural Integrity evaluated the existing structural systems to determine the requirements for seismic restraint, structural integrity and performance against current code standards. The as-built information from the different phases of development and field survey information were collected, integrated and documented. The whole system was systematically evaluated for current code levels and design modifications were developed for identified deficiencies.
A number of Huntair air handling units were proposed for installation at the new Kaiser Oakland Medical Center. Unfortunately, some of these new units fell outside the scope of the OSHPD OSP preapproval of the Huntair units.
Structural Integrity provided consulting services on this project to ensure systems comply with the provisions of the CBC. This included development and integration of a structural frame system within air handling units for stacked systems. Design required consideration of not only traditional strength design, but also explicit consideration of the transmission of dynamic loading through the lower units.
Modular vestibule systems were also designed to house various piping and electrical systems. This included development of seismic gap details between adjacent structures.
Bridges and tunnels connect our world, getting people and products where they need to go — efficiently. Structural Integrity has long been a leader in bridging the knowledge gap about the strength of these key lifeline structures. We are experts in identifying potential vulnerabilities and predicting behaviors in existing structures, and developing creative solutions to complex design issues. Along with our cutting-edge ANACAP-U software, our toolkit includes material modeling, fatigue analyses and seismic, shock and impact dynamics techniques. Our deep understanding of system behavior and mechanics delivers solutions that work in the real world.
Structural Integrity performed thermal analysis for the construction of the Benicia Martinez segmental bridge project in Northern California for CALTRANS. The concrete mix turned out to generate excessive heat of hydration and, therefore, a combination of cooling measures was required. We also performed heat of hydration analysis and evaluation of cooling systems for mass concrete placements and provided design alternatives for internal cooling of the mass concrete placement.
SI worked with IBT Engineers on the Hodariyat bridge project and verified the BD2-to-LARSA model conversion. As part of this conversion process, substantial quality assurance checks were performed to ensure the proper conversion occurred. The upper pylon was designed using combined loads from BD2 and LARSA global models. Second order analysis was required to calculate p-delta effects in the pylon as code based modification factors for slenderness were found to have substantial conservatism.
that work in the real world
The Port Mann Bridge Project includes the construction of a new 10-lane bridge consisting of an 850 m signature span cable stayed structure and precast segmental approach spans built with both balanced cantilever and span-by-span construction. SI worked with IBT Engineers in the design of the main span floor beam system and median struts to resist all imposed loads during erection, service and extreme events. SI also designed approach span expansion pier segments and hinge beams, as well as checking main span edge girders for loads during erection.
From locks and dams that make rivers more navigable to plants that turn water into kilowatts, Structural Integrity creates solid solutions for waterway infrastructure. Using advanced nonlinear techniques, our team can identify even the slightest vulnerability to seismic, fatigue and other hazards. Our wheelhouse also includes complex design issues and aging infrastructure. Along with our utility clients, we proudly support the United States Army Corp of Engineers in its mission to promote safe river navigation.
The earthen and rockfill gravity dam was constructed in 1958 by Pacific Gas and Electric Company with a height of 260 feet and a length of 3,330 feet at its crest. Structural Integrity performed a structural evaluation of the overall stability of the dam and the use of rock anchors. A new hydrological study indicated higher probable maximum flood levels. PG&E being concerned about overturning contracted with Structural Integrity to evaluate their design for installing rock anchors from crest into foundation.
The purpose of the project was to address the design and safety issues associated with the proposed modifications to Lost Creek Dam. A nonlinear dynamic time history seismic analyses was performed with finite element models representing the existing conditions. Further revisions to those proposed modifications were recommended based on the assessment results. Critical to achieving meaningful results from the analysis of the concrete arch dam was the ability of our models to accurately capture tensile cracking, subsequent redistribution of stresses and changing load paths as damage progresses during a seismic event.
Cresta dam is owned by Pacific Gas and Electric Company (PG&E) and is one of three PG&E FERC projects that are located along the main stem North Fork Feather River in California. PG&E wanted to evaluate the Dam for stability under the increased uplift pressures beneath the dam and called on Structural Integrity to perform an overall dam safety and stability analysis.
safe and efficient waterways
The greater the risk, the more rigorous the review — and Structural Integrity dives deep to ensure the integrity of nuclear facilities. From Department of Energy sites to commercial nuclear and weapons facilities, we are sought after for our exacting evaluations. Our structural expertise includes impacts of extreme events, as well as normal loadings over long periods of time. Our in-depth seismic evaluations even allow us to quantify component-level fragilities. Partner with us and tap into the power of prevention.
Structural Integrity performed a probabilistic analysis to determine time-dependent prestress losses after 60 years for a concrete nuclear containment structure for SNPI. The loss estimates were calculated using an ABAQUS finite element model of the structure to ensure sufficient structural capacity during extreme loading events is specified as a Mission Critical I structure, therefore must satisfy the requirements of Appendix E of UF 3-310-04.
The objective of this work is to assess the structural performance of reinforced concrete support structures and bioshields at operating PWR plants based on the data developed for distribution levels of neutron fluence and the effects of this irradiation on the properties of the concrete. Structural Integrity utilized its in-house non-linear concrete analysis code ANACAP to evaluate the long-term irradiation effects up to 80 years of services life. Structural Integrity was able to accurately predict the extent of the damage caused by this exposure through analytical means and ANACAP.
Structural Integrity performed an extensive study on the modal combination of hydrodynamic loading in liquid storage tanks. The study analyzed 6 different tanks with varying dynamic properties for all possible ground motions combinations. The study also considered problems addressing the Defense Nuclear Facilities Safety Board (DNFSB) comments related to the influence of fault-normal velocity pulse-like motions.
Structural Integrity developed a finite element analysis (FEA) model to investigate local damage effects from an aircraft engine missile impacting a reinforced concrete wall. SI utilized ABAQUS for geometry and mesh generation and TeraGrande (in-house FEA program) for analysis. The FEA model was used to investigate perforation and scabbing of the concrete wall for realizations outside the bounds of available empirical equations.
With the depth of engineering expertise and the breadth of industries and facilities Structural Integrity services, the inclusion of Bend, Oregon - based TRU Compliance was an obvious fit to help facilitate a full scope of project-specific and product line approvals for a range of code requirements and disaster contingencies. Recognized as a leader in Seismic, Wind & Blast product certification since 2008, TRU Compliance is a full-service product certification agency designed to provide customized, turn-key certification programs tailored to meet our clients’ unique needs. These capabilities, together with the core strengths of Structural Integrity, allow clients the ability to qualify by analysis, and now, qualify by testing.
TRU Compliance provides comprehensive solutions especially well-suited for structures, systems and components (SCCs) in the critical markets and industries served by Structural Integrity. Certification programs are founded on technically defensible approaches which satisfy the most stringent requirements and jurisdictional reviews.
With over 15,000 individual product certifications to date, you can trust TRU Compliance and its extensive staff of experts to effectively execute projects from beginning to end.
Shake table testing or engineering analysis to certify equipment for use in hospitals, emergency response centers, and more for earthquake protection.
Hurricane, tornado, and windstorm testing & analysis to the latest codes and standards to certify products and keep them fastened when the storm hits.
The Leader in Product Certification for
Blast and physical security testing and analysis for products protecting military, civilian, and industrial facilities from terrorism or accidental explosion.
The complete, up-to-date, source for equipment that meets the highest standards of structural and operational earthquake performance. Wind and blast database coming soon.
Structures may experience unforeseen operating environments or site-specific hazards leading to changes in the structures performance, safety, and longevity. These changes often prompt asset owners to undertake analysis efforts to ensure satisfactory structural performance for the updated conditions. However, conventional analyses which fail to capture the true behavior of a structure can lead to inaccurate analysis results, causing owners to make less than ideal asset management decisions. Structural Integrity Associates is uniquely positioned to pair our dynamic characterization and advanced structural analysis capabilities to generate a better structural model. Structural Integrity vibration experts use impact testing, forced vibration, or ambient excitation sources, along with proprietary signal processing software, to non-destructively characterize the dynamic behavior of structural systems. This characterization is used to inform advanced structural analyses by our analysis experts to provide more accurate results related to operational improvements, damage location, and retrofits.
Objective: Support New Design
Tobolski Watkins Engineering (TWE), acquired by Structural Integrity in 2017, provided structural and seismic consulting related to the nonlinear analysis of a 30-story hotel to determine acceptable performance of the building during large earthquakes and tropical storms. TWE developed a 3D finite element model of the building to perform nonlinear time history analyses, modal analyses, and nonlinear pushover analyses. Additional work included in-situ testing of the main tower to determine the damped natural frequencies of vibration of the bare frame structure, prior to the construction of building cladding and nonstructural components. The purpose of the testing was to provide input for calibrating the finite element model of the building and for use as input to extreme wind load calculations.
Objective: Vibration Study
A fuel manufacturer ships nuclear fuel across the country via trailer transport. Structural Integrity was contracted to develop a test procedure and a mobile data acquisition system to measure the vibration acceleration experienced by the trailer and fuel packages during shipments across the United States. The system measured accelerations over the course of the multi-day shipment. Our experts analyzed the data to better characterize the vibration acceleration amplitudes as well as frequency content of the trailer-package-fuel assembly system as vibration is transmitted from the road through the trailer suspension, packages, and into the fuel assemblies. The improved understanding of the vibration signature for the transport system assists the manufacturer in making decisions on how to best mitigate vibration levels during future transportation.
through technically defensible analyses