Nonlinear Behavior of Precast Concrete Coupling Beams under Lateral Loads
Nonlinear Behavior of Precast Concrete Coupling Beams under Lateral Loads
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DOI：
10.1061/(asce)0733-9445(2007)133:11(1571
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发表时间：
2007-11
期刊：
影响因子：
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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
本文对预制混凝土连梁在单调横向荷载作用下的非线性性能进行了分析研究。与传统的整体式混凝土连梁相比，建议系统中的钢筋混凝土墙墩的耦合是通过在楼板和屋顶层将梁和墙后张拉到一起来实现的。在水平荷载作用下，连梁的非线性变形主要是由于梁-墙界面处的间隙张开引起的。新系统提供了几个整体式系统的优点，如更简单的梁和墙墩的细节（不需要对角钢筋交叉梁墙接头），减少对结构的破坏，并能够自我中心，从而减少了大地震后建筑物的残余横向位移。在梁端使用钢顶角钢和钢底角钢，以在地震期间屈服并提供能量耗散。研究了后张拉量、梁、墙特性、顶底角特性等设计参数对楼层连梁抗侧力和位移特性的影响。结果用于确定如何通过设计控制系统行为。提出了一种计算非线性侧向荷载-变形关系的方法。
This paper presents an analytical investigation of the nonlinear behavior of precast concrete coupling beams under monotonic lateral loading. In contrast to conventional monolithic concrete coupling beams, coupling of reinforced concrete wall piers in the proposed system is achieved by posttensioning the beams and the walls together at the floor and roof levels. Under lateral loads, the nonlinear deformations of the coupling beams occur primarily due to the opening of gaps at the beam-to-wall interfaces. The new system offers several advantages over monolithic systems, such as simpler detailing for the beams and the wall piers (no need for diagonal reinforcement crossing the beam-to-wall joints), reduced damage to the structure, and an ability to self-center, thus reducing the residual lateral displacements of the building after a large earthquake. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation during the earthquake. The paper investigates the effects of design parameters, such as the amount of posttensioning, beam and wall properties, and top and seat angle properties, on the lateral strength and displacement characteristics of floor-level coupling beam subassemblies. The results are used to determine how the system behavior can be controlled by design. A procedure to estimate the nonlinear lateral load-deformation relationship of the subassemblies is developed.