C+S December 2020 Vol. 6 Issue 12 (web)

Examination Waiting Area

Patient Room

the optimum isolator type and layout for the project, Arup conducted an isolation scheme optimization study in which six different schemes were evaluated. These schemes consisted of utilizing three different types of isolators; triple friction pendulum (TFP) bearings, lead rub- ber bearings (LRB), and high damping rubber (HDR) bearings, with various layouts. Performance of the superstructure and the foundations were also evaluated for each of the schemes through nonlinear time- history analyses of six different nonlinear models of the entire build- ing. The analyses were conducted using seven pairs of horizontal and seven vertical time histories, both for upper-bound and lower-bound isolator properties, resulting in a total of 168 time-history analyses. Upon presentation of results, Rönesans Holding selected the TFP bear- ings, the design of which ensures the hospital can displace by 27 inches at the isolation level during an earthquake. The hospital’s large-scale structure and location in a highly active seismic region made it challenging to analyze. LS-Dyna, which is an advanced finite element analysis software, was used to expedite the non-linear analysis workflow. In conjunction with LS-Dyna, digital technology and cloud computing have been used throughout the design process, from the wall optimization and the isolator selection studies, to the performance evaluation of the final design. This improved the efficiency of the design process significantly, enabling Arup to go beyond standard computational limits and finalize the design of the hospital within a year. Isolator selection study alone was completed within two months, at the onset of design development, which enabled Rönesans Holding to choose the most optimum isolation scheme based on performance, cost, and schedule. Through traditional means of workflows, analysis, optimization and design of a structure of this scale and complexity would have taken a couple of years. In addition to cloud computing and digital tools implemented to auto- mate the analysis model generation and post-processing of the results, Arup also developed a web interface through which performance results of the wall optimization studies and the associated concrete quantities were shared with the client. This unique interface allowed Rönesans Holding to be engaged in the engineering design and to leverage this information as part of their procurement strategy and process.

Operating Room

In a profession that heavily relies on formulas and rules written in building codes, as structural engineers, instead of adopting traditional means of workflows, we should adapt to the rapid advancements in digital technology. This would allow us time to explore structural sys- tem alternatives aligned with the project needs, and deliver optimized, cost-efficient and sustainable designs of the ever-growing large-scale, complex projects in our industry without the need to extend the project schedules. As structural engineers, we have a unique opportunity to contribute to the improvement of resiliency in our cities. Without being restricted by the minimum building code requirements, having clear communica- tion on project specific seismic performance objectives with our clients at the onset of a project would allow us to deliver resilient buildings that would remain functional even after rare earthquake events. This, in conjunction with making digital investments in the industry, will help us achieve resiliency in our communities.



december 2020

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