蜂窝型钢高性能混凝土梁受力性能试验研究  

EXPERIMENTAL STUDY OF THE MECHANICAL BEHAVIORS OF CSRHPC BEAMS

作　　者：苏益声[1,2] 孟二从 邱秀丽[1] 皮云东[1] 肖祖霖 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学广西防灾减灾与工程安全重点实验室,南宁530004

出　　处：《工业建筑》2015年第9期141-148,共8页Industrial Construction

基　　金：国家自然科学基金项目(51468003);广西理工科学实验中心重点项目(LGZX201102);广西防灾减灾与工程安全重点实验室项目(20122DX02)

摘　　要：针对不同的型钢保护层厚度、剪跨比、型钢形式以及有无抗剪键这四个因素,对6根蜂窝型钢高性能混凝土梁和1根实腹型钢高性能混凝土梁进行静载试验,以此来探讨这种新型结构的受力性能。试验结果表明:蜂窝型钢高性能混凝土梁符合平截面假定;梁在剪跨比λ≥1.5时的破坏可分为弯剪破坏、剪切劈裂破坏、一般弯曲破坏与弯曲劈裂破坏四种形态;蜂窝型钢高性能混凝土梁的黏结滑移性能明显优于实腹型钢高性能混凝土梁;在蜂窝型钢中加入抗剪键对梁的极限承载力、黏结滑移及挠度变化影响不大;蜂窝型钢高性能混凝土梁的刚度比扩张前的实腹型钢高性能混凝土梁的刚度大,且延性要好;型钢保护层厚度对梁的极限承载力影响较大;梁的极限承载力及开裂荷载与剪跨比有关,具体表现为随着剪跨比的减小而变大。研究将为蜂窝型钢高性能混凝土梁的相关计算理论及工程应用提供参考。In light of four different factors ： cover thickness, shear span ratio, section steel form and shear key, static load test was done for six CSRHPC （castellated steel reinforced high performance concrete） beams and one SWSRHPC （solid web steel reinforced high performance concrete） beam to study the mechanical properties of this new structure. The results showed that the CSRHPC beams accorded with plane cross-section assumption. The failure mode of the beam is divided into bending shear failure, shear splitting failure, general bending failure and bending splitting failure when the shear span ratio of the beam was more than or equal to 1.5. The bond-slip performance of the CSRHPC beam is significantly better than that of the SWSRHSC beam. Adding shear key to castellated section steel had little effect on the ultimate bearing capacity,bond-slip performance and deflection of the beam. Comparing CSRHPC beam with SWSRHPC beam, the CSRHPC beam＇ s stiffness was larger and its ductility was better. Steel reinforced the cover thickness of the section steel had a big impact on the ultimate bearing capacity of the beam. The ultimate bearing capacity and cracking load of the beam were related to the shear span ratio, they were increased with the decrease of the shear span ratio. This study would provide references for the calculation theory and engineering application of the CSRHPC beams.

关 键 词：蜂窝型钢高性能混凝土梁 受力性能 试验研究 极限承载力 黏结滑移 

分 类 号：TU398.9[建筑科学—结构工程]