摘要
为了研究不锈钢钢筋混凝土梁(SRC梁)在冲击荷载作用下的损伤行为,采用国内先进超高重型落锤冲击试验系统对2组钢筋混凝土梁进行竖向冲击试验,并建立考虑材料率效应的有限元模型,对实验结果进行验证与拓展。研究结果表明:在冲击荷载作用下,等截面代替后合理配筋的SRC梁具有较好的抗冲击性能;若梁的损伤逐渐接近完全破坏,则跨中峰值位移与残余位移的比值逐渐减小并趋于1.5;SRC梁的最大极限位移较RC梁大;梁整体的破坏类型主要取决于抗弯、抗剪、抗开裂能力是否能承受局部破坏后剩余的冲击荷载;分析得出局部响应阶段梁扰动区域内力计算的经验公式。
In order to study the damage behavior of stainless steel reinforced concrete beams under impact load,the domestic advanced ultra-high heavy drop hammer impact test system was used to conduct vertical impact tests on two sets of reinforced concrete beams,and a finite element model considering the material rate effect was established.The experimental results are verified and expanded.The conclusions are as follows.Under the action of impact load,the stainless steel reinforced concrete beam with reasonable reinforcement after replacement of equal section has better impact resistance.If the damage of the beam is gradually approaching complete failure,the ratio of the mid-span peak displacement to the residual displacement gradually decreases and tends to 1.5.The maximum ultimate displacement of stainless steel reinforced concrete beams is larger than that of ordinary reinforced concrete beams.The damage type of the beam as a whole mainly depends on whether the flexural,shear and crack resistance can withstand the remaining impact load after partial damage.An empirical formula for calculating the internal force of the beam disturbance zone in the local response stage is obtained.
作者
周锡武
汪祥宇
张稳
张文超
ZHOU Xiwu;WANG Xiangyu;ZHANG Wen;ZHANG Wenchao(School of Transportation and Civil Engineering&Architecture,Foshan University,Foshan 528000,China;School of Civil and Architectural Engineering,Guangxi University,Nanning 530000,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第9期2400-2407,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50978058)
广东省重大科研项目(2014KZDXM064)
广东省高等学校自然科学研究项目(2013KJCX0188)。
关键词
SRC梁
冲击荷载
局部破坏
等截面替代
stainless steel concrete beam
impact load
local failure
replacement of equal section
