Static and dynamic behavior of concrete lift joint interfaces
Static and dynamic behavior of concrete lift joint interfaces
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DOI：
10.1061/(asce)0733-9445(1998)124:12(1418
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发表时间：
1998-12-01
期刊：
影响因子：
--
通讯作者：
Tinawi, R
中科院分区：
文献类型：
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作者：
Fronteddu, L;Leger, P;Tinawi, R
对不同表面处理的混凝土举升节点试件进行了位移控制剪切试验，比较了节点的动、静滑动特性。试验结果表明，在静、动剪切作用下，摩擦系数随法向载荷的增大而减小，抗剪强度与表面处理有关。整体节理和喷水节理的抗剪强度均高于未处理节理和独立于平面的节理。由于迟滞回线非常稳定，在动态滑动剪切试验中没有明显的强度退化。抗剪强度与施加剪切位移的频率无关。建立了基于基本摩擦系数和粗糙度摩擦系数的经验提升节理本构模型，该模型取决于表面处理的类型。采用提出的升力节理本构模型对某90 m混凝土重力坝的地震滑动响应进行了研究。
Displacement controlled shear tests on concrete lift joint specimens with different surface preparations are conducted to compare dynamic sliding joint behavior with the static behavior. Experimental results indicate that the coefficient of friction decreases with the increase in normal load, under both static and dynamic shear The shear strength is dependent on surface preparation. Monolithic specimens and water-blasted joints show higher shear strengths than untreated joints and plane independent joint surfaces. No strength degradation is noticeable under dynamic sliding shear tests since hysteresis loops are very stable. No dependency of shear strength on frequency content of the imposed shear displacements is observed. An empirical lift joint constitutive model is developed as a function of a basic friction coefficient and a roughness friction coefficient that is dependent upon the type of surface preparation. The proposed Lift joint constitutive model is used to study the seismic sliding response of a 90-m concrete gravity dam.