Abstract
Abstract In order to assess the seismic damage response of reinforced concrete deficient, weak beam-column connection frame structures, this study presents experimental shake table testing on representative 1/3rd reduced size and double story frame models. Two test models were considered for experimental testing, including a reference code design specimen and another frame with a similar characteristic, but was not provided with any shear reinforcement in the critical joint connection region and, was constructed with concrete having a compressive strength of 33 % less than the code specified value. The input scaled excitations were applied from 5 % to 130 % of the maximum input peak ground acceleration record, to deformed the test models from elastic to inelastic stage and then to fully plastic incipient collapse stage. The weak beam-column frame sustained plastic hinging at column bases and beam ends, with longitudinal reinforcement bar-slip and severe damageability of the joint panels upon subjected to multiple dynamic excitations. The deficient frame model was only able to resist 40 % of the maximum acceleration record as compared to the code design frame which was able to resist about 130 %.
Highlights
Due to the use of old building codes and the improper use and execution of the current special moment resisting frame SMRF seismic code detailing, have caused the majority of these RC building having different seismic defects or deficiencies
In order to assess the seismic damage response of reinforced concrete deficient, weak beam-column connection frame structures, this study presents experimental shake table testing on representative 1/3rd reduced size and double story frame models
4 Conclusions Recent reinforced concrete special moment resisting frame SMRF structures with weak beamcolumn joints defects have been evaluated through dynamic shake table testing, in order to access the seismic performance and ultimate damage mechanism of such class of deficient RC structures
Summary
Due to the use of old building codes and the improper use and execution of the current special moment resisting frame SMRF seismic code detailing, have caused the majority of these RC building having different seismic defects or deficiencies. The objectives of the testing program were to investigate the effectiveness of a tuned mass damper (TLD) retrofitting scheme and to observed the inelastic behavior of a non-seismic design RC frame structure under increasing dynamic excitations It was observed from the from test results that under increasing dynamic shaking, the model damage behavior is mostly concentrated at the base of the lower story columns base and beam-column panels. Seismic assessment studies on the current special moment resisting frames SMRF structures (beam and column members are as per the seismic code requirement), but having weak beam-column joints (no transverse ties reinforcement and built with low strength concrete) and their seismic behavior at the ultimate damage state, are lacking. The objectives of the current experimental program are to understand the dynamic response, damage mechanism at ultimate capacity and to develop drift-based damage scales for RC frame structures with weak beam-column joint connections
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