Application of Engineered Cementitious Composites (ECC) in interior beam–column connections for enhanced seismic resistance
Application of Engineered Cementitious Composites (ECC) in interior beam–column connections for enhanced seismic resistance
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DOI：
10.1016/j.engstruct.2014.03.026
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发表时间：
2014-06
影响因子：
5.5
通讯作者：
S. Qudah;M. Maalej
中科院分区：
文献类型：
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作者：
S. Qudah;M. Maalej
本研究旨在评估使用超延性工程胶凝复合材料（ECC）作为提高梁柱连接性能的手段的可行性。在高地震活动性带（ubc - 3区）的2型（ac352r -02）内连接的9个1 / 3比例尺试件进行了反循环加载模拟地震激励试验。这些试件的节点在几何形状和主要钢筋细节上是典型的，是根据ACI318-08设计的原型建筑框架的试件。横向增强筋的数量和布置以及连接塑性区内的材料是主要变量。将一系列ECC增强的梁柱内部连接的性能与对照混凝土的性能进行比较，以评估在这种类型的应用中使用ECC的好处。以柱荷载-位移响应（包括极限荷载和极限位移）、（滞回）吸能能力和开裂响应作为比较标准。试验结果表明，在连接塑性区使用ECC材料替代混凝土，部分替代横向（约束）钢筋，可显著提高节点抗剪能力、吸能能力和开裂响应，从而提高节点抗震性能，降低钢筋壅塞和施工复杂性。
This study aims to evaluate the feasibility of using ultra-ductile Engineered Cementitous Composites (ECC) as a means to enhance the performance of beam–column connections. Nine one-third scale specimens, consisting of type 2 (ACI352R-02) interior connections at a zone of high seismicity (UBC-zone 3), were tested under reverse cyclic loading, simulating seismic excitation. The joints of these specimens were typical in geometry and main reinforcement detailing to specimens of a prototype building frame designed according to ACI318-08. The primary variables were the amount and arrangement of transverse reinforcements, and the materials within the plastic zone of the connection.The performances of a series of ECC-enhanced beam–column interior connections were compared to that of a control concrete counterpart to evaluate the benefits of using ECC in this type of application. The column load–displacement response (including the ultimate load and ultimate displacement), the (hysteresis) energy absorption capacity, and the cracking response were used as criteria in the comparison.The test results indicated that the use of ECC material in the connection plastic zone as a replacement of concrete and partial replacement of transverse (confinement) reinforcement can significantly enhance the joint shear resistance, energy absorption capacity, and cracking response, thereby, enhancing the joint seismic resistance and reducing reinforcement congestion and construction complexity.