摘要
采用不同型号的高强钢丝布对预应力混凝土空心板板底加固处理后,进行静载试验,并使用有限元模拟软件对预制板进行模拟分析。结果表明,模拟结果与试验结果吻合,预制板经高强钢丝布-聚合物砂浆加固后,能有效提高其开裂荷载和极限荷载,承载能力提高40%以上,对同一规格高强钢丝布,极限荷载的提高幅度大于开裂荷载,随单位宽度高强钢丝束数量的增加,板底跨中位置处的挠度也随之增大,预制板延展性提高;采用G450及以上型号的高强钢丝布加固预制板,在达到极限挠度状态时,预制板不会发生脆性断裂;在预制板跨中挠度变形达到允许挠度L_(0)/200时,发生开裂,但未达到极限状态。
This study employs various high-strength steel wire cloth types to conduct static loading tests on prefabricated slabs following reinforcement treatment.Finite element analysis is utilized to simulate the tested slabs.The findings indicate a close alignment between the finite element simulation and experimental results.Specifically,the reinforcement using high tensile steel wire cloth-polymer mortar effectively enhances the cracking and ultimate loads of the precast panels,resulting in a bearing capacity increase of over 40%.For identical specifications of high-tensile steel wire cloth,the ultimate load improvement surpasses the cracking load enhancement.As the number of high tensile steel wire bundles per unit width increases,the deflection at the center span bottom of the panel also rises.Notably,the prefabricated plate exhibits superior ductility,particularly when reinforced with G450 or higher-grade high-tensile steel wire cloth,which prevents immediate brittle fracture upon reaching the ultimate deflection state.Furthermore,while cracking occurs when the mid-span deflection deformation reaches the permissible deflection L_(0)/200,it does not signify the attainment of the ultimate state.
作者
许家文
张家广
柳威振
侯晋杰
XU Jiawen;ZHANG Jiaguang;LIU Weizhen;HOU Jinjie(Shanxi Academy of Building Sciences Group Co.Ltd.,Taiyuan 030001,China;Shanxi Academy of Building Research Testing Center Co.Ltd.,Taiyuan 030001,China;Taiyuan University of Technology,Taiyuan 030024,China)
出处
《新型建筑材料》
2025年第12期49-53,共5页
New Building Materials
基金
中央引导地方科技发展资金项目(YDZJSX20231B005)
山西省基础研究计划自然科学研究面上项目(202203001221065)。
关键词
高强钢丝布
预应力混凝土空心板
受弯加固
静载试验
high-strength wire cloth
prestressed concrete hollow-core slab
bending reinforcement
static load test
