Parameters influencing performance of elastomeric bearings at low temperatures

Experimental research was conducted to investigate the performance of elastomeric bridge bearings at low temperatures. Full-size natural rubber and neoprene bearings were tested by specially designed test setups inside a walk-in-type environmental chamber. Steel laminated bearings were ordered with two specified shear modulus, 0.69 and 1.08 MPa. Tests were conducted at 23, -10, -20, and -30degreesC for a period of 21 days. The effect of cyclic compression, cyclic shear, rate of loading, type of elastomer compound, temperature history, creep, and slip coefficient on the performance was investigated. Approximately 500 shear stiffness tests were performed. Results indicated that the increase in shear stiffness at low temperature is a function of elastomer compound, temperature, and time. In addition, rate of loading, amplitude of strain, coefficient of friction, and temperature history were identified as important parameters that influence the bearing performance. Creep behavior at low temperature was significantly different from creep at room temperature but had no significant influence on the overall performance. It was shown that cyclic compression force and cyclic shear strain do not have significant influence on time-dependent stiffening (crystallization) of bearings. The results of this paper were used to develop a performance-based evaluation and acceptance criterion that is presented in a companion paper.


Analysis of the effects of vertical pre-release cracks on prestressed concrete bridge girders
Baran, Eray; French, Catherine; Wyffels, Tina (Precast/Prestressed Concrete Institute, 2004-11-01)
Vertical cracks, termed "pre-release cracks," beginning at the top flange and propagating downward into the section depth have been observed to develop during the production of long-span prestressed concrete bridge girders. The cracking which is attributed to the restrained shrinkage the concrete and thermal effects during the curing period prior to release of the prestressing strands, tends to be more critical for long-span girders with deep sections and large amounts of prestressing strands. Studies were ...
Performance Examination of Two Seismic Strengthening Procedures by Pseudodynamic Testing
Kurt, Efe Gokce; Kurç, Özgür; Binici, Barış; Canbay, Erdem; Ozcebe, Guney (American Society of Civil Engineers (ASCE), 2012-01-01)
Pseudodynamic testing was employed to observe the seismic performance of two retrofit methods on two-story, three-bay frame structures. The test frames had hollow clay tile (HCT) infill in the central bay and incorporated the seismic deficiencies of Turkish construction practice, such as use of plain reinforcing bars, low-strength concrete, and insufficient confining steel. Two noninvasive and occupant-friendly retrofit schemes suggested in the Turkish Earthquake Code, namely, use of fiber-reinforced polyme...
Low-Cycle Fatigue Testing of Shear Links and Calibration of a Damage Law
Bozkurt, Mehmet Baklr; Kazemzadeh Azad, Sina; Topkaya, Cem (American Society of Civil Engineers (ASCE), 2018-10-01)
This paper experimentally studies the low-cycle fatigue (LCF) behavior of shear links in eccentrically braced frames (EBFs) with the aim of calibrating a convenient damage law for estimating the exhausted as well as remaining life of these members under any loading history. A total of 14 specimens are tested using a nearly full-scale EBF setup under constant-amplitude cycles as well as proportional and arbitrary loading histories. A generalized damage law is subsequently calibrated using results of the pres...
Effect of Shear Wall Area to Floor Area Ratio on the Seismic Behavior of Reinforced Concrete Buildings
Burak Bakır, Burcu (American Society of Civil Engineers (ASCE), 2013-11-01)
An analytical study is performed to evaluate the effect of shear wall area to floor area ratio on the seismic behavior of midrise RC structures. For this purpose, 24 midrise building models that have five and eight stories and shear wall ratios ranging between 0.51 and 2.17% in both directions are generated. Then, the behavior of these building models under earthquake loading is examined by carrying out nonlinear time history analyses. In the analyses, seven different ground motion records are applied to th...
Evaluation of elastomeric bearing performance at low temperatures
Yakut, Ahmet (American Society of Civil Engineers (ASCE), 2002-08-01)
Recent studies on elastomeric bearings led to changes in the design specifications, which tend to indicate that bearings fabricated in the past, would fail the current test requirements. This is contrary to the fact that there have been no reported problems of poor bearing performance in low-temperature regions. AASHTO requires low-temperature tests to determine the change in the shear modulus, which is limited to a certain value. This criterion does not adequately address the performance of the bearings, b...
Citation Formats
A. Yakut, “Parameters influencing performance of elastomeric bearings at low temperatures,” JOURNAL OF STRUCTURAL ENGINEERING-ASCE, pp. 986–994, 2002, Accessed: 00, 2020. [Online]. Available: