波形钢腹板预弯工形梁的试验研究  

Experimental research on preflex I-beam with corrugated steel web

作　　者：陈卓异[1] 黄侨[1] 杨明[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2013年第5期973-978,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51078078);中央高校基本科研业务费专项资金资助项目(CXZZ12_0110)

摘　　要：对新型结构波形钢腹板预弯工形梁的制作工艺和承载性能开展了探索性研究.通过制作缩尺试验梁,着重分析了波形钢腹板钢梁在预弯力作用下的挠度和反弹后一期混凝土的压应力,并采用静载试验测试了对称集中荷载作用下的梁体变形、开裂弯矩、破坏形态和极限承载力等.试验结果表明,在预弯力作用下波形钢腹板具有良好的稳定性.释放预弯力后波形钢腹板钢梁能够有效地将预应力施加在一期混凝土上,跨中下缘混凝土的压应力为12.9 MPa.试验梁具有良好的抗弯刚度、延性和抗裂性能,其开裂荷载约为极限承载力的47%.理论与实测结果表明,波形钢腹板预弯工形梁的竖向剪切挠度占总挠度的22.4%,在计算挠度时需考虑剪切变形的影响.A scaled model beam was fabricated to explore the construction technology and load-carrying capacity of a new structure, preflex I-beam with corrugated steel web. The deformation of the preflex steel beam under preflex loads and the stress of the first-stage concrete after rebounding were emphatically analyzed. The structural deformation, cracking moment, damaged shape and ultimate bearing capacity of the model beam under symmetrically concentrated forces were tested. The experi- mental results show that the corrugated steel web is steady under preflex loads. The prestress can ef- fectively be applied to the first-stage concrete by preflex steel beam after rebounding, and the compressive stress of concrete at the lower edge of the beam is 12.9 MPa. The test beam possesses good ductility, flexural stiffness and crack resistance. The cracking load of the test beam is about 47% of its ultimate load capacity. Analytical and experimental results indicate that the shearing deflection of the preflex I-beam with corrugated steel web in mid-span is 22.4% against the total deflection, which needs to be considered in calculation.

关 键 词：预弯梁 波形钢腹板 模型试验 承载力分析 剪切变形 

分 类 号：TU398.9[建筑科学—结构工程]