Autoadaptive Structural Composites with Large Deformation Capacity for Seismic Resistant Structures

采用超延性应变硬化工程胶凝复合材料（ECC）代替脆性混凝土，可以克服标准R/C构件在脆性剪切和钢筋屈曲方面的局限性。ECC与钢筋结合的优点是构件的变形可以沿其长度分布，因此对纵向钢筋的局部变形要求较少。目前的研究重点是利用ECC的异常行为及其与钢筋的相互作用来增强R/C结构的地震反应。介绍了新颖的设计理念。具体而言，将对候选增强材料与ECC的相互作用进行详细的调查和分析。随后，将对柱和梁构件进行设计和测试。最后，将R/ECC柱和梁单元组装成抗弯矩框架并进行测试。总体目标是开发一种具有优异抗震性能的结构框架体系，并具有内在的、基于材料的安全机制。

The use of ultra ductile, strain-hardening Engineered Cementitious Composites (ECC), instead of brittle concrete, can overcome limitations in brittle shear and reinforcement buckling of standard R/C members. The advantage of combining ECC and reinforcement is that the deformation of the structural member can be distributed along its length, and therefore require less localized deformation of the longitudinal reinforcement. The present research focuses on the enhancement of seismic response of R/C structures by exploiting the unusual behavior of ECC and its interaction with reinforcement. Novel design concepts are introduced. Specifically, detailed investigations and analyses will be performed on the interaction of candidate reinforcement materials and ECC. Subsequently, column and beam members will be designed and tested. Finally, R/ECC column and beam elements will be assembled into moment resisting frames and tested. The overall objective is to develop a structural frame system with superior seismic resistance with an intrinsic, materials-based safety mechanism.