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Analysis of RC Structural Frames Strengthened by Steel Bracing

Abbasi Dezfuli, Elena | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49862 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Concentric steel braces and brace-type dampers are often applied to the upgrading of reinforced concrete frames subjected to lateral loads. These braces may develop High axial tension forces, and transferring them appropriately to the existing beam– Column joints is a key challenge. This paper investigates a solution for connecting the end-plate of the steel brace with the frame, using shear-key plates fixed to the concrete with anchor bolts, and a low friction material inserted between the end-plates and the shear-key plates. The presence of the low friction material impedes the development of tension forces in the anchor bolts and ensures that they are basically subjected to shear forces. This prevents brittle types of failure concrete cone failure, pull-out/pry-out failure, and results in a reduction of the number of anchors required as well as anchorage height. The efficiency and validity of the proposed brace–frame connection is investigated experimentally by means of shaking table tests conducted on a scaled reinforced concrete frame retrofitted with brace-type hysteretic dampers. In this thesis, the present work aims to establish a framework for design and modeling of brace-frame connection with hysteretic dampers here call BFC- damper for reinforced concrete building. A FEM model for BFC- damper has been developed in ABAQUS to simulate the performance of the system. The results of simulation will be compared with the existing experimentally frames. The output of the present work will provide a guideline for design and analyses of RC structural frames strengthened by steel bracing
  9. Keywords:
  10. Comparison Survey ; Shear Key ; Reinforced Concrete Frame ; Steel Brace ; Hysteresis Damper ; Concentric Bracing

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