CAJ | 학술논문

通过抗折静载试验,得到了不同钢纤维体积率(0%、1%、2%)预应力钢纤维板的抗弯强度,揭示了钢纤维的掺入能有效阻止混凝土基体开裂,提高混凝土板的抗折强度;根据恒应力幅抗折疲劳试验,分析了预应力钢纤维混凝土板的破坏形式,得到循环应变幅-循环比曲线、循环应力-应变曲线、塑性应变能-循环比曲线.研究结果表明,当达到疲劳总寿命的80%时,钢纤维体积率为0%的混凝土板的应变幅值增长较快,已经进入不稳定发展阶段,而2%的混凝土板仍然处于稳定发展阶段,预应力钢纤维混凝土板的塑性应变能呈现明显的三阶段变化趋势.
통과항절정재시험,득도료불동강섬유체적솔(0%、1%、2%)예응력강섬유판적항만강도,게시료강섬유적참입능유효조지혼응토기체개렬,제고혼응토판적항절강도;근거항응력폭항절피로시험,분석료예응력강섬유혼응토판적파배형식,득도순배응변폭-순배비곡선、순배응력-응변곡선、소성응변능-순배비곡선.연구결과표명,당체도피로총수명적80%시,강섬유체적솔위0%적혼응토판적응변폭치증장교쾌,이경진입불은정발전계단,이2%적혼응토판잉연처우은정발전계단,예응력강섬유혼응토판적소성응변능정현명현적삼계단변화추세.
Through the static load test,we got the bending strength of steel reinforced prestressed concrete slab with different volume ratio of steel fiber (0%,1%,2%),revealed that the incorporation of steel fiber can prevent the matrix cracking of concrete,improved the flexural strength of concrete slab. Constant fatigue stress flexural fatigue trial analyze the failure mode of steel fiber reinforced prestressed concrete slab,get the cyclic strain amplitude-cycle ratio curve,cyclic stress-strain curve and plastic strain energy-cycle ratio curve of steel reinforced prestressed concrete slab with different volume ratio of steel fiber (0%, 1%,2%). Research results showed that strain amplitude of the concrete slab in 0% volume ratio of steel fiber will grow rapidly and has entered unstable state with 80% total fatigue life. But the concrete slab in 0% volume ratio of steel fiber was in stable development stage. The plastic strain energy of prestressed steel fiber reinforced concrete slab can be changed in the three cycles obviously.