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SE12-024
10:50
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11:05
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ASSESSMENT OF A CURTAIN WALL SYSTEM USED IN HIGH-RISE BUILDINGS AND DEVELOPMENT OF A MONITORING METHOD
A metal curtain wall system was tested in the NCREE South Lab shaking table facility. Curtain walls have been designed in reference to the seismic design limit of a story drift angle of 1% in Japan. Such curtain wall system has a physical property to flexibly move together with seismic deformations of the main building frame. The mechanical connection of a fastener is designed to behave as a hinge. The flexibility of a curtain wall system can be utilized for the assessment of an entire building system. In this study, gyros incorporated in the curtain wall system showed a function to assess the movement of a curtain wall. A numerical model was developed representing the local deformations of a curtain wall. Gyro data assessment was verified indicating a method to be combined with numerical analysis.
Shunsuke Toyao, Takuya Nagae, James Chen, Koichi Kajiwara, Yoshikazu Kanzaki, Yu-Lin Chung
Damage monitoring, Gyro, Metal curtain wall, Numerical model, Shaking table test
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SE12-021
11:05
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11:20
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ANALYSIS AND VERIFICATION OF SEISMIC REINFORCEMENT PERFORMANCE OF MASONRY WALLS USING PREFABRICATED STEEL BAND AND URES RETROFITTING METHOD
The objective of this study was to analyze and verify the seismic reinforcement performance of the masonry wall. (Lee et al., 2014) proposed a fabricated steel plate band retrofitting method in seismic reinforcement performance of masonry walls in existing buildings. In this study, an experiment to investigate whether only UreS coating is applicable in place of the connecting steel plate, metal lath, and plaster of metal lath was conducted. For the experiment, a 4000mm × 2700mm masonry wall was built and UreS coating was sprayed after reinforcing steel with reference to (Lee et al., 2014). The repetitive force was performed in a horizontal direction using the displacement control method using an actuator of 1000kN on the settled specimen. At this time, unlike (Lee et al., 2014), the specimen did not have metal lath, connection steel plate, or plaster of metal lath. The results showed no rocking failure and that sliding failure was dominant. As a result of comparing the maximum yield strength and the cumulative dissipation energy of MS-SF specimen and M-R-SU specimen, it was confirmed that the MS-SF specimen had approximately 1.3 times greater maximum yield strength and approximately 1.4 times more cumulative energy uptake than M-R-SU specimen. In addition, the UreS coating did not play the role of connecting steel plate connecting horizontal and vertical steel plate in the MS-SF specimen and the necessity of the connecting steel plate was confirmed.
Hae-Yong Park, Han-Gil Kim, Sang-Hoon Oh
Masonry Wall, seismic performance, Static Test, Steel Plate Retrofitting Method, UreS Retrofitting Method
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SE12-022
11:20
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11:35
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Shake Table Test for Seismic Performance Investigation of Cladding System Installed at the Steel Frame
This study investigates the seismic performance of a lightweight steel truss system among several types of cladding systems using metal panels. In the Republic of Korea, the vertical and horizontal members of the truss connection are generally constructed using 1.6 mm thickness square pipes made by tack welding, while some structures are constructed using 2.0 mm square pipes. In this experiment, the shaking table tests were carried out in the in-plane direction for four parameters, including the construction examples using the steel frame. In the case of a metal panel applied to a lightweight steel truss system, the relative displacement in the in-plane direction between the structure and the steel truss causes damage, such as cracking in the welding point, tearing of the panel fixed by the screw, wrinkling of the metal panel itself, and fall-out of the panel. In this experiment, this damage was visually inspected, and used as a basis for evaluating seismic performance. The maximum response drift angle of the steel frame was measured at 2% rad, and the damage type was defined by performance level, in order to compare the observed damage by visual inspection according to the measured response drift angle.
Hae-Yong Park, Sang-Hoon Oh, Jae-Han Park
Cladding system, In-plane displacement, Seismic performances, Shake table test, Steel truss
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SE12-033
11:35
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11:50
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Evaluation of Equivalent Static and Dynamic Analysis Method for Siesmic Design of Non-Structural Elements
Seismic design of non-structural elements (NSEs) has recently become one of the major topics in earthquake engineering because of costly and widespread damage reported in recent earthquakes. In major building codes, the seismic design forces are determined based on either the equivalent static method or dynamic analysis methods. However, simple and empirical equivalent static approach neglect several key influential parameters which could significantly affect the acceleration demand on NSEs. Alternatively, the dynamic analysis methods are expected to provide more reasonable results since they consider dynamic properties of primary structural systems in determining the seismic demand. In this study, in order to appraise the accuracy and the reliability of each method, a comparative case study was conducted using realistic 3-dimensional building models. It is shown that the magnitude and profile of the peak floor acceleration can significantly be affected by the characteristics of supporting structures such as modal periods, type of lateral resisting system, and inherent torsion. The floor response spectrum of a torsionally irregular building was unique in that the first three modes were collectively tuned within a narrow band because of the closely spaced nature of the first three modes. The code prescribed component amplification factor was unconservative around the tuning periods and varied depending on the location of floor. Dynamic analysis approach including tuning effect appears inevitable for more accurate and rational seismic design of NSEs.
Su-Chan Jun, Cheol-Ho Lee, Bae Chang-Jun, Sung-Yong Kim
dynamic method, equivalent static method, floor acceleration, floor response spectrum, non-structural elements
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SE12-018
11:50
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12:05
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Dynamic behavior of anchored nonstructural component connected via yielding elements
Nonstructural components failure during an earthquake can impair the overall performance of a building through property damage, loss of function, and reduced occupant safety. Seismic code provisions are focused on minimizing the life-safety hazard of impact by a nonstructural element and currently do not consider other performance goals. The seismic force demand on nonstructural components is based on simplified code equations that do not adequately consider the contribution of the component attachment to the overall dynamic response of the component. A set of tests were conducted using the NARlabs shaking table located in Tainan, Taiwan, in order to evaluate this contribution. The tests were based on a nonstructural experimental model that was connected to a concrete slab using several different attachment designs. All the attachments were designed to be the weakest element, such that they would control the maximum demand on the nonstructural element. The designs were based on creating various plastic mechanisms of the yielding attachment, which in turn control the available displacement ductility in the response of the component. This paper focuses on the contribution of the attachment flexibility and yielding mechanism to the overall dynamic response of the component. The experimental results indicate that the use of attachments that are designed with increased ductility does not necessarily result in reduced component forces.
Tal Feinsein, Jack Moehle
Experimental earthquake simulation, nonstructural components, seismic performance, Shaking-table
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SE12-036
12:05
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12:20
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EXPERIMENTAL INVESTIGATION ON CYCLIC BEHAVIOR OF HYBRID SPRING SUPPORT APPLIED FOR ELECTRIC SWITCHBOARDS
If buildings are damaged from the earthquakes, economic losses would be occurred due to structural and/or non-structural damage and would increase as countries are urbanized. Since seismic damages such as a power outage and network disruption might result in social chaos, electric equipment represented as the switchboard should be protected from the seismic hazard to enable stable electric power supply even after the earthquake. In order to reduce excessive inertia forces applied to switch boards due to large stiffness of the switchboard cabinet, earthquake engineering society has been paid attention to various devices to minimize potential damages. Of various devices for the electric equipment, this paper introduces and experimentally evaluates the hybrid springs consisting of the wire rope elastic mount with horizontal direction stiffness and the polyurethane that provides additional damping. To do this, cyclic tests of hybrid spring supports applied for electric switchboards are performed to figure out the effects of loading directions that are categorized to rolling and shear directions. Effectiveness of applying hybrid spring supports on the electric switchboard is validated by comparing experimental hysteresis characteristics obtained from cyclic tests with those of the existing wire-rope support.
Dong-Hyeon Shin
cyclic test, electric switchboard, hybrid spring support, polyurethane, wire-rope
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