The development of fragility relations is an important step in the application of performance-based earthquake engineering. Data from 69 tests were collected and reviewed to develop fragility relations for new slab-column frame construction. Damage states were defined and fragility relations were developed for reinforced and post-tensioned concrete connections, both with and without shear reinforcement. Test results were reviewed to determine the likelihood and type of repair for various damage states. Derived empirical fragilities were incorporated into the ATC-58 loss estimation software Performance Assessment Calculation Tool (PACT). Nonlinear pushover analyses were conducted on test specimens and findings were compared to test results to assess bias in common modeling approaches. Comparisons indicate that the values of median model to test ratios vary between 0.9 and 1.25 for displacements corresponding to yield and for models with column stiffness based on ASCE 41-06 median stiffness at low axial loads of 0.2EIgross.
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References
1.
AslaniH., and MirandaE., 2005. Fragility assessment of slab-column connections in existing non-ductile reinforced concrete buildings, Journal of Earthquake Engineering9, 777–804.
American Society of Civil Engineers (ASCE), 2007. Seismic Rehabilitation of Existing Buildings (including Supplement 1), ASCE 41-06, Reston, VA.
4.
BaiJ. W., 2004. Seismic Fragility and Retrofitting for a Reinforced Concrete Flat-Slab Structure, M.Sc. Thesis, Texas A&M University, College Station, TX.
5.
BerryM., ParrishM., and EberhardM., 2004. PEER Structural Performance Database User's Manual, Pacific Earthquake Engineering Research Center, University of California, Berkeley.
6.
BrownS. J., 2003. Seismic Response of Slab-Column Connections, Ph.D. Thesis, University of Calgary, Calgary, Alberta, Canada.
7.
CaoH., 1993. Seismic Design of Slab-Column Connections, Ph.D. Thesis, University of Calgary, Calgary, Alberta, Canada.
8.
DurraniA. J., DuY., and LuoY. H., 1995. Seismic resistance of nonductile slab-column connections in existing flat-slab buildings, ACI Structural Journal92, 479–487.
9.
ElwoodK. J., MatamorosA., WallaceJ. W., LehmanD., HeintzJ., MitchellA., MooreM., ValleyM., LowesL. N., ComartinC., and MoehleJ. P., 2007. Update to ASCE/SEI 41 concrete provisions, Earthquake Spectra23, 493–523.
10.
ElwoodK. J., and EberhardM. O., 2006. Effective Stiffness of Reinforced Concrete Columns, PEER Research Digest, Pacific Earthquake Engineering Research Center, Univerity of California, Berkeley, CA.
11.
EmamM., MarzoukH., and HilalM. S., 1997. Seismic response of slab-column connections constructed with high-strength concrete, ACI Structural Journal94, 197–205.
12.
ErberikM. A., and ElnashaiA. S., 2004. Fragility analysis of flat-slab structures, Engineering Structures26, 937–948.
13.
FarheyD. N., AdinM. A., and YankelevskyD. Z., 1993. RC flat slab-column subassemblages under lateral loading, Journal of Structural Engineering119, 1903–1916.
14.
Federal Emergency Management Agency (FEMA), 1997. NEHRP Guidelines for the Seismic Rehabilitation of Buildings, FEMA 273, Washington, D.C.
15.
Federal Emergency Management Agency (FEMA), 2000. Prestandard and Commentary for the Seismic Rehabilitation of Buildings, FEMA 356, Washington, D.C.
16.
GogusA., 2010. Structural Wall Systems—Nonlinear Modeling and Collapse Assessment of Shear Walls and Slab-Column Frames, Ph.D. Thesis, University of California, Los Angeles, CA.
17.
GogusA., and WallaceJ. W., 2008. Fragility Curves for Slab-Column Connections, Rep. No. UCLA SGEL 2008-05, University of California, Los Angeles, CA.
18.
HanS. W., KeeS., ParkY., LeeL., and KangT. H., 2006. Hysteretic behavior of exterior post-tensioned flat plate connections, Engineering Structures28, 1983–1996.
19.
HanS.-W., KeeS.-H., HaS.-S., and WallaceJ. W., 2008. Effects of bottom reinforcement on hysteretic behavior of post-tensioned flat plate connections, Engineering Structures135, 1019–1033.
20.
KangT. H., and WallaceJ. W., 2008. Seismic performance of reinforced concrete slab-column connections with thin plate stirrups, ACI Structural Journal105, 617–625.
21.
MarzoukH., OsmanM., and HusseinA., 2001. Cyclic loading of high-strength lightweight concrete slabs, ACI Structural Journal98, 207–214.
22.
MorrisonD. G., HirasawaI., and SozenM. A., 1983. Lateral-load tests of R/C slab-column connections, Journal of Structural Engineering109, 2698–2714.
23.
NaeimF., AlimoradiA., HagieS., and ComartinC., 2007. PACT Performance Assessment Calculation Tool User Guide, PEER, Berkeley, CA.
24.
PanA., and MoehleJ. P., 1992. An experimental study of slab-column connections, ACI Structural Journal89, 626–638.
25.
PanA., and MoehleJ. P., 1989. Lateral displacement ductility of reinforced concrete flat plates, ACI Structural Journal86, 250–258.
26.
PorterK. A., KennedyR. P., and BachmanR. E., 2007. Creating fragility functions for performance based earthquake engineering, Earthquake Spectra23, 471–489.
27.
RobertsonI., and JohnsonG., 2006. Cyclic lateral loading of nonductile slab-column connections, ACI Structural Journal103, 356–364.
28.
RobertsonI. N., and DurraniA. J., 1992. Gravity load effect on seismic behaviour of interior slab-column connections, ACI Structural Journal88, 37–45.
29.
RobertsonI. N., KawaiT., LeeJ., and EnomotoB., 2002. Cyclic testing of slab-column connections with shear reinforcement, ACI Structural Journal99, 605–613.
30.
StarkA., BiniciB., and BayrakO., 2005. Seismic upgrade of reinforced concrete slab-column connections using carbon fiber-reinforced polymers, ACI Structural Journal102, 324–333.
31.
U.S. Army Corps of Engineers, 1985. Crack Repair Method: Epoxy Injection, REMR Technical Note, CS-MR-3.9.
32.
WeyE. H., and DurraniA. J., 1992. Seismic response of interior slab-column connections with shear capitals, ACI Structural Journal89, 682–691.
33.
WidiantoT. Y., ArgudoJ., BayrakO., and JirsaJ. O., 2006. Rehabilitation of earthquake-damaged reinforced concrete flat-plate slab-column connections for two-way shear, in Proceedings of the 8th U.S. National Conference on Earthquake Engineering, San Fransisco, CA.
