摘要：500MPa钢筋是我国现阶段大力推广的受力钢筋,其构件的抗震性能研究尤为重要。通过9根后张有黏结预应力混凝土梁及1根普通钢筋混凝土梁的低周反复加载试验,对配置500MPa钢筋后张有黏结预应力梁的抗震性能进行分析,包括梁的滞回性能、骨架曲线、位移延性、刚度退化、耗能性能等。研究了换算配筋率、有效预应力、预应力筋合力点到构件边缘距离、预应力强度比、受压钢筋配筋量等参数对其抗震性能的影响。在此基础上,评估《混凝土结构设计规范》(GB 50010—2010)中有关预应力混凝土结构抗震设计相关规定的合理性。

摘要：Porous ionic polymers have demonstrated great potential for high-performance separation by the merits of their unique molecular recognition,but the preparation of anion-functionalized ionic polymers for the separation of bioactive molecules with highly similar structures remains a ***,through the facile Friedel-Crafts alkylation between benzylimidazole ionic liquids(ILs)and crosslinkers,several anion-functionalized hypercrosslinked ionic porous polymers(HIPs)are reported,which are well decorated with strongly basic carboxylate anions as well as feature tubular morphology and excellent thermal *** adsorption capacity(103.6 mg g^(−1) for tocopherol homologues)and selectivity(S_(βγ/α),4.26;S_(δ/α),3.19)for bioactive compounds with high structural similarity have been realized,superior to those of commercial adsorbents,hypercrosslinked polymer without ILs,and HIPs with common *** study manifests a new synthetic strategy and rational molecular design for functionalized adsorbents,as well as offers new opportunities to enable high-performance separation.