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CFHT Pier Building Evaluation

CFHT Pier Building Evaluation. Work summary Analysis concerns and discussion Future work. Work Summary. Evaluation of the capacity is done according to International Building Code (IBC) and the American Concrete Institute code (ACI318).

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CFHT Pier Building Evaluation

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  1. CFHT Pier Building Evaluation • Work summary • Analysis concerns and discussion • Future work CFHT Pier Building Evaluation by Mathieu Angers

  2. Work Summary • Evaluation of the capacity is done according to International Building Code (IBC) and the American Concrete Institute code (ACI318). • Structure modeled in ANSYS and SAP2000 to obtain the stresses and forces. • ANSYS Mechanical can perform parametric studies. • SAP2000 has the building codes implemented and allows to do design. • Results of ANSYS and SAP2000 are compared. • The capacity is evaluated with material mechanic principles to compare to the software results. ACI 371 concrete pedestal water towers code was used as well as ACI 318. • Bending capacity • In-plane and radial shear capacity • Axial capacity CFHT Pier Building Evaluation by Mathieu Angers

  3. Work Summary • The pier building is now modeled in both softwares. • Without the ring girder and telescope frame. • Openings are modeled. • Soil-Foundation interaction considered. • Analysis • Elastic analysis • Modal analysis • Response spectrum analysis • Load combinations according to IBC 2008. • 1.4 dead load • 1.2 dead load + 1.6 live load • 1.2 dead load + 1.0 earthquake load + 0.5 live load • Peak ground acceleration used: 1.17g. Value given in the IBC CFHT Pier Building Evaluation by Mathieu Angers

  4. Work Summary • Results from the softwares • Stresses • Forces • Base reactions • Natural periods • Mode shapes • Envelope of the different load combinations • SAP2000 has a function that permits the evaluation of the required amount of steel necessary to resist the different load combinations. • These results will be compared to the pier building reinforcement to evaluate the structure. • Foundations • Analysis is being done by Dr. WuDi and Andy Liu. • Bearing capacity of the soil. • Structural capacity of the footings. • Settlements of the soils. CFHT Pier Building Evaluation by Mathieu Angers

  5. Work Summary CFHT Pier Building Evaluation by Mathieu Angers

  6. Discussion • Telescope configuration • Ring girder placed on the top floor without any modification to the pier building. • + No work to be done on the pier building. • + Integrity of the pier building is not modified (No rebars cut at the joints and stiffness of the structure is conserved). • - No reduction in the weight of the structure (high stresses). • - Does not provide additional height for the telescope. • Top storey completely removed and ring girder placed on the second floor. • + Provides additional height for the telescope. • + Reduces the weight of the structure. • - Problems at the section where the wall will be cut. Lap splices being cut: loss of capacity and stiffness. • Top slab is removed and replaced by a light weight steel slab. Ring girder placed on the top of the wall. • + Reduction of the weight • - Problems at the section where the wall will be cut. Lap splices being cut: loss of capacity and stiffness. • - Does not provide additional height for the telescope. CFHT Pier Building Evaluation by Mathieu Angers

  7. Discussion • Rebar information • The most recent plans are the SNC drawings and represent the actual structure. (Foundation on site is of the SNC plans) • Rebar lists referred by the SNC placing drawings were not found. • Solution: Use the bar sizes and spacing from the IEC drawings. • Problem: No information on rebar sizes and spacing for the ring wall foundation. • Links between the pier and the enclosure. • Confirm that the wind loads are not transmitted to the pier. CFHT Pier Building Evaluation by Mathieu Angers

  8. Future work • Finish the evaluation of the soils and foundation (Dr. WuDi and Andy Liu) • Improve the seismic analysis. • Ameliorate the soil-structure interaction model. • Model in SAP2000 and ANSYS the telescope structure. • Ring girder and its connections to the pier. • Telescope support frame. • Telescope mass and mass moment of inertia. • Comparison of the results of the analysis with the actual structure. • Final assessment of the pier building. CFHT Pier Building Evaluation by Mathieu Angers

  9. QUESTIONS? CFHT Pier Building Evaluation by Mathieu Angers

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