Experimental Evaluation of Posttensioned Precast Concrete Coupling Beams
Experimental Evaluation of Posttensioned Precast Concrete Coupling Beams
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DOI：
10.1061/(asce)st.1943-541x.0000212
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
B. Weldon;Y. Kurama
中科院分区：
文献类型：
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作者：
B. Weldon;Y. Kurama
本文描述了反向循环横向荷载作用下无粘结后张预制混凝土连梁的八个半比例试验的结果。每个测试样本包括连梁和位于地板水平的相邻混凝土墙墩区域。在横向荷载作用下，无粘结后张连梁的非线性位移由梁墙接头处的间隙开口控制。梁端使用钢顶角钢和钢座角钢来屈服并提供能量耗散。试验参数包括梁后张筋面积和初始应力、梁混凝土初始轴应力、角强度和梁深度。结果表明，循环荷载作用下连梁的横向刚度、强度和延展性，相当大的能量耗散集中在角度处。结果表明，由于后张力的恢复作用，卸载时结构的残余位移很小。将测试样本的持续弦旋转能力与之前整体连梁测试的结果进行了比较。
This paper describes the results from eight half-scale experiments of unbonded posttensioned precast concrete coupling beams under reversed-cyclic lateral loading. Each test specimen includes a coupling beam and the adjacent concrete wall pier regions at a floor level. Under lateral loads, the nonlinear displacements of unbonded posttensioned coupling beams are governed by the opening of gaps at the beam-to-wall joints. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation. The test parameters include the beam posttensioning tendon area and initial stress, initial beam concrete axial stress, angle strength, and beam depth. The results demonstrate the lateral stiffness, strength, and ductility of the coupling beams under cyclic loading, with considerable energy dissipation concentrated in the angles. It is shown that the residual displacements of the structure upon unloading are small due to the restoring effect of the posttensioning force. The sustained chord rotation capacities of the test specimens are compared with those from previous tests of monolithic coupling beams.