By S. Tanvir Wasti, Guney Ozcebe
Earthquakes affecting city components can result in catastrophic occasions and threat mitigation calls for preparatory measures in any respect degrees. Structural overview is the analysis of the seismic health and wellbeing of constructions. review is the prelude to judgements approximately rehabilitation or maybe demolition. the dimensions of the matter in dense city settings brings a couple of want for macro seismic appraisal strategies simply because huge numbers of present constructions don't agree to the elevated necessities of latest earthquake codes and requisites or produce other deficiencies. it's the weak structures - susceptible to reason harm and dying - that want speedy awareness and pressing appraisal for you to come to a decision if structural rehabilitation and upgrading are possible. present monetary, effective and occupant-friendly rehabilitation concepts differ greatly and comprise the applying both of precast concrete panels or layers, strips and patches of fiber bolstered polymers (FRP) in strategic destinations. The papers during this publication, many through popular professionals in earthquake engineering, chart new and important instructions of study and alertness within the evaluate and rehabilitation of structures in seismic areas. whereas numerous papers talk about the probabilistic prediction and quantification of structural harm, others current techniques comparable with the in-situ and occupant pleasant upgrading of structures and suggest either comparatively cheap and functional suggestions to handle the matter.
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Extra info for Advances in Earthquake Engineering for Urban Risk Reduction (NATO Science Series: IV: Earth and Environmental Sciences)
X A large number and variety of researches have been conducted in many public and private institutes in response to social demands for the seismic rehabilitation, particularly, the demand of “in-service rehabilitation”. x Performance-based design approaches have often been adopted since the Kobe Earthquake because higher performances than “life safety” have been required in many cases. While the rehabilitation has been impossible in some cases because it would completely change the feature of the building.
45dbL 15dbL 30dbL 45dbL Ty (%): yield Ȟ= My (kNm): FRP jacket: fc no. of layers (MPa) N/Acfc yield moment chord with P-ǻ rotation –height of application test calc. test calc. 0 Tu (%): ultimate chord rotation test calc. 25 TABLE 2. Columns retrofitted with concrete jackets: parameters, key results, model predictions Specimen Connection Lap measures of splice jacket to the old column old col. Q-RCM monolithic control1 Q-RCW welded Ubars Q-RCD dowels Q-RCR roughening Q-RCRD roughening +dowels Q-RC No treatment Q-RCpd No treatment pre-damage Q-RCL1 No treatment 15dbL Q-RCL2 25dbL Q-RCL1pd No 15dbL Q-RCL2pd treatment, 25dbL pre-damage R-RCL1 15dbL R-RCL3 No treatment 30dbL 45dbL R-RCL4 My (kNm): Ty (%): yield chord N/Acfc yield moment with rotation jcktd.
RESEARCH AND DEVELOPMENT OF NEW TECHNIQUES In 2000 and 2004 the JCI carried out questionnaire surveys of new techniques for seismic rehabilitation, which were developed by general contractors (Japan Concrete Institute, 2000 and 2004). The total number of general contractors which responded to the surveys was 57. Work term reduction 100 80 Others Cost reduction Isolated column n = 38 (2000) = 19 (2004) 50 Others 60 Design friendly 0 Removal unnecessary 20 Reduction of noise, vibration, etc Lightweight Work space Reduction (a) Objectives Column with side walls 30 40 20 40 Exterior frame 10 Beam 0 Placing steel brace Survey 2000 Survey 2004 Shear wall Placing steel wall Placing concrete wall (b) Subject members and methods Figure 9.