RPC加固混凝土框架动态性能与抗爆设计方法研究

活性粉末混凝土(RPC)具有高韧性、高耐久性、高强重比的特点，RPC加固钢筋混凝土(RC)形成RPC-RC结构，是土木工程可持续发展的重要途径。爆炸事故频发，尚缺乏爆炸荷载作用下RPC-RC框架动态性能与破坏模式研究。本项目主要研究：(1)基于RPC动态轴拉性能试验与断裂力学，揭示RPC动态轴拉断裂机制，建立动态受拉应力-应变关系计算模型；(2)基于动态黏结试验与损伤力学，揭示RPC-RC界面动态黏结性能规律与破坏模式，建立数学表达；(3)基于爆炸试验与有限元分析，揭示动态黏结性能、轴拉和爆炸升温对RPC-RC柱动力响应与破坏机制的影响规律，提出基于超压-冲量(P-I)曲线的RPC-RC柱损伤评估方法；(4)提出RPC-RC框架结构抗爆性能数值分析与设计方法，揭示RPC提升抗爆性能的机理。研究成果为RPC加固RC抗爆设计提供科学依据，为土木工程可持续发展与“一带一路”建设提供有力保障。

RPC is a promising building material, with good toughness, good durability and high strength to weight ratio. RPC strengthen reinforced concrete(RC) structure is an important way for the sustainable development of civil engineering.Accidental explosions take place frequently. Dynamic response law and failure mechanism of RPC-RC structures need to be researched.(1)Based on dynamic axial tensile test of RPC by Split Hopkinson Press Bar and fracture mechanics, to reveal the dynamic toughening mechanism of RPC. The calculation formula of dynamic tensile stress-strain relationship including fiber effect and strain rate effect should be established.(2) Based on the dynamic bonding test and damage mechanics, to reveal the dynamic response law and failure mechanism of RPC-RCinterface. The calculation formula of dynamic bonding-slip relationship should be established.(3) Based on explosive test and finite element analysis, the effect of bonding performance, tensile proterties and blast-induced temperature on the dynamic response and failure mechanism of RPC-RC columns should be revealed.The protective performance assessment method and the damage assessment method of RPC columns based on P-I curves can be proposed. (4)The blast resistance design method and modelling mehtod of RPC-RC frame subjected to blast load should be revealed. The mechanism of improving the protective performance of RC frames by RPC can be revealed. Research results can provide scientific evidence for design of RPC strengthen RC structures subjected to blast,which is also the effective support for the sustainable development of civil engineering and “One belt, one road” construction.