Autoadaptive Structural Composites with Large Deformation Capacity for Seismic Resistant Structures

采用超韧性应变硬化工程水泥基复合材料(ECC)代替脆性混凝土，可以克服标准钢筋混凝土构件在脆性剪切和钢筋屈曲方面的局限性。ECC和配筋相结合的优点是结构构件的变形可以沿其长度分布，因此需要较少的纵向钢筋的局部变形。目前的研究集中在通过利用ECC的异常行为及其与配筋的相互作用来增强R/C结构的地震反应。引入了新颖的设计理念。具体而言，将对候选加固材料与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试验。最后，将R/ECC柱单元和梁单元组装成抗弯框架进行试验。总体目标是开发一种具有优越抗震能力的结构框架系统，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.