权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of impact-resistant design procedure of RC members using relationships among static bending/shear capacity, input energy, and absorbed energy

利用静态弯曲/剪切能力、输入能量和吸收能量之间的关系开发 RC 构件的抗冲击设计程序

基本信息

批准号：
11650475
负责人：
KISHI Norimitsu
金额：
$ 2.3万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

In this study, to establish a rational impact-resistant design procedure of Reinforced Concrete(RC)beams with statically bending-failure-mode and shear-failure-mode, falling-weight impact tests on various kinds of rectangular RC beams are conducted in which rebar ratio, shear-span ratio, cross sectional dimensions, and mass of steel weight are taken as variables. Impact load is surcharged onto the mid-span of simply supported RC beams using three kinds of steel weights varying mass : 200, 300, and 400 kg and applying two types of loading methods : iterative loading method and single loading method. In this experiment, impact force occurred in the steel weight, reaction force at support points, and displacements of RC beams are measured and recorded by wide-band analog data recorder.On the other hand, to establish a rational numerical analysis method for bending-failure-type and shear-failure-type RC beams under impact loading, elasto-plastic impact response analyses on RC beams are car … More ried out by means of three-dimensional Finite Element Method(FEM). The applicability of the proposed method using a simple constitutive law is discussed comparing with the experimental results mentioned above.The results obtained from this study are as follows : 1)Ultimate strength of bending-failure-type and shear-failure-type RC beams subjected to impact load can be estimated by using the maximum reaction force at failure ; 2)The impact-resistant design formulas for bending-failutre-type and shear-failure-type RC beams are empirically proposed using relationships among the maximum reaction force, absorbed energy, and residual displacement of the mid-span of beam at ultimate state. And theirs practical applicability is confirmed comparing the experimental results ; 3)Time histories of impact force, reaction force, and displacements of RC beams can be accurately predicted by means of the proposed simple FE analysis method. And also, crack patterns generated in the side-surface of RC beam can be predicted from maximum principal stress distribution. Less

为建立钢筋混凝土梁在静弯和剪切破坏模式下的合理抗冲击设计方法，以钢筋配筋率、剪跨比、截面尺寸和钢筋质量为变量，对不同类型的钢筋混凝土矩形梁进行了落锤冲击试验。采用200、300和400 kg三种不同质量的钢块，采用迭代加载法和单次加载法，对钢筋混凝土简支梁跨中施加冲击荷载。试验中采用宽带模拟数据记录仪对钢筋配重的冲击力、支撑点反力和梁的位移进行了测量和记录，并对钢筋混凝土梁进行了弹塑性冲击响应分析，为建立合理的弯曲破坏型和剪切破坏型钢筋混凝土梁冲击响应的数值分析方法提供了依据 ...更多信息通过三维有限元方法（FEM）进行。通过与试验结果的比较，讨论了采用简单本构关系的方法的适用性，得到如下结论：1）冲击荷载作用下弯曲破坏型和剪切破坏型钢筋混凝土梁的极限承载力可以用破坏时的最大反力来估算; 2）根据梁极限状态下跨中最大反力、吸收能量和残余位移之间的关系，经验性地提出了弯曲破坏型和剪切破坏型钢筋混凝土梁的抗冲击设计公式。通过与试验结果的对比，验证了该方法的实用性; 3）该方法能够准确预测钢筋混凝土梁的冲击力、反力和位移时程。根据最大主应力的分布，可以预测钢筋混凝土梁侧面的裂缝形态。少