Diagonally Reinforced Concrete Coupling Beams with Grade 120 (830) High-Strength Steel Bars
Diagonally Reinforced Concrete Coupling Beams with Grade 120 (830) High-Strength Steel Bars
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采用 120 (830) 级高强钢筋的斜向钢筋混凝土连梁
DOI：
10.14359/51728067
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发表时间：
2020
影响因子：
1.8
通讯作者：
A. Lepage
中科院分区：
文献类型：
--
作者：
Shahedreen Ameen;R. Lequesne;A. Lepage
在完全反向循环荷载下测试了四个大型连梁，以研究对角钢筋等级（60 或 120 [420 或 830]）、梁剪应力（9.5 或 14√ f c '，psi [0.79 或 1.17√ f c '，MPa]）和纵向钢筋细节（终止于梁-墙界面附近或发展到墙中）的性能影响。具有 60 级 (420) 钢筋的梁的连梁弦旋转能力为 7.1%，而具有 120 (830) 级钢筋的梁的连梁弦旋转能力介于 5.1% 和 5.6% 之间，差异可能是由于 60 级和 120（420 和 830）钢筋的箍筋间距为 3.4 db 和 4 db，其中 db 是对角钢筋直径。有效刚度、能量耗散和残余弦旋转与钢筋等级大致成反比。开发二次纵向钢筋减少了梁端的旋转需求，但没有提高变形能力。梁剪应力不影响梁弦旋转能力。
Four large-scale coupling beams were tested under fully reversed cyclic loads to investigate the effects on behavior of diagonal bar grade (60 or 120 [420 or 830]), beam shear stress (9.5 or 14√ f c ′, psi [0.79 or 1.17√ f c ′, MPa]), and longitudinal bar detailing (either terminated near the beam-wall interface or developed into the walls). Coupling beam chord rotation capacity was 7.1% for the beam with Grade 60 (420) bars and between 5.1 and 5.6% for the beams with Grade 120 (830) bars, a difference likely due to having hoops spaced at 3.4 d b and 4 d b for Grade 60 and 120 (420 and 830) bars, where d b is the diagonal bar diameter. Effec - tive stiffness, energy dissipation, and residual chord rotations were approximately inversely proportional to bar grade. Developing the secondary longitudinal reinforcement reduced rotation demands at beam ends but did not improve deformation capacity. Beam shear stress did not affect beam chord rotation capacity.