Download Advances in Earthquake Engineering for Urban Risk Reduction by S. Tanvir Wasti, Guney Ozcebe PDF

By S. Tanvir Wasti, Guney Ozcebe

Earthquakes affecting city parts may end up in catastrophic events and threat mitigation calls for preparatory measures in any respect degrees. Structural review is the prognosis of the seismic overall healthiness of structures. evaluation is the prelude to judgements approximately rehabilitation or perhaps demolition. the dimensions of the matter in dense city settings brings a few desire for macro seismic appraisal methods simply because huge numbers of latest structures don't agree to the elevated specifications of recent earthquake codes and standards or produce other deficiencies. it's the weak structures - vulnerable to reason harm and demise - that want quick awareness and pressing appraisal so as to come to a decision if structural rehabilitation and upgrading are possible. present financial, 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 e-book, many via well known gurus in earthquake engineering, chart new and very important instructions of analysis and alertness within the overview and rehabilitation of structures in seismic areas. whereas a number of papers talk about the probabilistic prediction and quantification of structural harm, others current ways comparable with the in-situ and occupant pleasant upgrading of structures and suggest either least expensive and sensible ideas 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)

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Box 1424, Patras, Greece MICHAEL N. O. O. O. Box 1424, Patras, Greece Abstract. Experimental and analytical work is reported for jacketed concrete columns, including short lap splices at the base. 45 rectangular columns with smooth or ribbed vertical bars are subjected to cyclic flexure with constant axial load. Test parameters are the presence and length of lap splices and the type of retrofitting: concrete jackets over the whole column, or CFRP wrapping of the plastic hinge region at varying number of layers and height of application from the base.

20 S. SUGANO Damage Index D 100 80 60 Damage Level D҈50 Major D=10~50 Medium D=5~10 Minor Light D<5 N=167 Present Building Standard Law Major Damage 40 1981 20 0 1920 1930 1940 1950 1960 1970 1980 1990 2000 Construction Year Figure 1. Damage to reinforced concrete school buildings in Kobe City (Architectural Institute of Japan, 1997). The Kobe Earthquake significantly changed the feature of seismic rehabilitation of existing reinforced concrete buildings. The number of implementations of seismic rehabilitation has been clearly increasing after this earthquake.

For members with rectangular section and ribbed (deformed) longitudinal bars without lapping in the end region, the value of My may be computed from first principles, while those of Ty and Tu (or Tupl) may be obtained from semiempirical or purely empirical relations developed by (Biskinis and Fardis, 2004) on the basis of the results of almost 1700 tests and adopted in (CEN, 2005). Based on the average ratios of (a) the experimental value for the 13 tests in Table 2 and of the 39 additional tests the literature, to (b) the value predicted considering the column as monolithic as above, the following relations were developed in the present study (and adopted in CEN, 2005) for the values of My*, Ty*, Tu* of the jacketed member, in terms of the values My, Ty, Tu resulting from the assumptions above, regardless of any lap splicing of vertical bars in the original column: x For My*: My *= My.

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