无黏结部分预应力RPC吊车梁挠度与刚度的静载试验研究  

Unbonded partially prestressed crane beam deflection and stiffness of RPC static load test research

作　　者：金凌志[1] 吴欣珂[1] 周红梅[1] 刘潘[1] 陈敏 

机构地区：[1]桂林理工大学广西建筑工程检测与试验重点实验室,广西桂林541004 [2]广东省第四建筑工程公司,广州510100

出　　处：《河南理工大学学报（自然科学版）》2013年第2期218-224,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：广西建筑工程检测与试验重点实验室项目(11-cx-04);桂林科技攻关项目(桂科攻0995004)

摘　　要：为了研究无黏结部分预应力活性粉末混凝土受弯构件的刚度变化特征及计算方法,对2根无黏结部分预应力吊车梁进行试验研究,获得了吊车梁在各级荷载作用下挠度变化图及刚度变化值;分析梁的受力及整个破坏过程,建立荷载-挠度变化曲线,将试验值和计算值展开对比研究,修正了反拱值;建立了梁开裂前后刚度计算公式.研究结果表明,梁开裂前,预应力效应和RPC的抗拉作用是保持其刚度恒定的主要因素;梁开裂后直至破坏,钢纤维以及预应力筋面积对挠度的影响较大,是影响其变化的主要因素.对于无黏结预应力活性粉末混凝土简支梁,在开裂前取0.85B0计算反拱值较为合理;在计算预应力RPC梁的开裂后刚度时,RPC的抗拉强度和钢纤维的拉结作用对梁的整体刚度有较大的提高,其增大系数可以达到1.7左右.In order to research the stiffness changes and calculation method of a no-bond-part-prestressed activ- ity-powder-concrete component, two no-bond-part-prestressed crane beams were tested. The crane-beam de- flections under loads at all levels and the change in stiffness values were obtained; the internal force and an entire damage process of the two beams were analyzed; a load-deflection change curve was established; the test value and calculation value were contrasted, the anti-arch value was revised, and the stiffness calculation formulae before and after beam cracking were also established. Research results indicates that： before crack- ing, the prestressed effect and RPC of anti-pulled role of a beam are the main factors to keep its stiffness being stable; after cracking until destruction, the steel fiber and prestressed gluten area have an important influence on the deflection. For an unbonded prestressed reactive powder concrete simply supported beam, 0.85Bo is the more reasonable value to calculate the anti-arch value before cracking; after cracking rachel role in the aclculation of prestressed RPC beams, the RPC tensile strength of steel fiber have greatly improved the overall stiffness of the beam, increasing coefficient can reach about 1.7.

关 键 词：RPC吊车梁 预应力 刚度 反拱 挠度 

分 类 号：TU312.1[建筑科学—结构工程] TU317.1