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首页> 外文会议>SP-228; International Symposium on Utilization of High-Strength/High-Performance Concrete vol.1; 20050620-24; Washington,DC(US) >Development of Precast High- Performance Fiber Reinforced Cement Composite Coupling Beams for Earthquake-Resistant Wall Systems
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Development of Precast High- Performance Fiber Reinforced Cement Composite Coupling Beams for Earthquake-Resistant Wall Systems

机译：防震墙体预制高性能纤维增强水泥复合梁的开发

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摘要

Coupling beams in earthquake-resistant wall structures have long represented a design challenge due to the high shear stress and distortion demands imposed by strong earthquakes. Currently, the design of reinforced concrete coupling beams, particularly those with low span-to-depth ratios, involves substantial reinforcement detailing to ensure a stable behavior during earthquakes, leading to reinforcement congestion and construction difficulties. As a design alternative, the use of strain-hardening or high-performance fiber reinforced cement composites (HPFRCCs) in coupling beams was experimentally investigated. The use of composite materials with large strain capacity and damage tolerance was aimed at reducing transverse reinforcement requirements while maintaining adequate seismic behavior, makingthe construction of coupling beams more feasible. To validate this alternative, three HPFRCC coupling beam specimens and one control reinforced concrete coupling beam were tested. The main variables investigated were the type of material used in the coupling beams, fibertype, and reinforcement detailing. Test results indicate that in orderto achieve large displacement capacity, diagonal reinforcement must be provided in the proposed HPFRCC coupling beams. However, the use of an advanced fiber cementitious material allowed the elimination of the transverse reinforcement required to provide confinement and diagonal bar support in RC coupling beams, thus, significantly simplifying the reinforcement details.
机译：长期以来，抗震墙结构中的耦合梁一直代表着设计挑战，这是由于强地震施加的高剪切应力和变形要求。目前，钢筋混凝土连接梁的设计，特别是跨度-深度比低的那些，涉及大量的钢筋细节，以确保地震期间的稳定行为，从而导致钢筋拥挤和施工困难。作为设计的替代方案，实验研究了在耦合梁中使用应变硬化或高性能纤维增强水泥复合材料（HPFRCC）。使用具有大应变能力和破坏容限的复合材料的目的是减少横向钢筋的要求，同时保持足够的抗震性能，使耦合梁的建造更加可行。为了验证该替代方法，测试了三个HPFRCC耦合梁样本和一个对照钢筋混凝土耦合梁。研究的主要变量是耦合梁中使用的材料类型，纤维类型和钢筋细部。测试结果表明，为了实现大位移能力，必须在建议的HPFRCC耦合梁中提供对角线加固。但是，使用高级纤维水泥质材料可以消除在RC耦合梁中提供约束和对角钢筋支撑所需的横向钢筋，从而大大简化了钢筋细节。

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