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

Study on Ultimate Shear Strength and Shear Design Equation for the Spirally Reinforced Concrete Columns

螺旋钢筋混凝土柱极限抗剪强度及抗剪设计方程研究

基本信息

批准号：
61550400
负责人：
ARAKAWA Takashi
金额：
$ 1.28万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The purpose of this study is to clarify the following items, according to the cyclic loading tests on 28 (divided into 2 series in each 14, scale is about 1/3 of full-size) column specimens with spiral hoops.1) To determine quantitatively certain factors' influences on the ultimate shear strength of reinforced concrete octagonal columns with spiral hoops.2) To review the suitability of the experimental equations and several countries' code equations for shear strength of reinforced concrete columns based on the recent test date.The results are summarized as follows:(1) the phenomena of cracking and shear failure for the octagonal columns with spiral hoops are similar to those of the normal columns with square hoops.(2) The ultimate shear strength of the spirally reinforced concrete columns increased with the increasing of concrete strength (Fc), axial load (N), spiral reinforcement ratio and longitudinal reinforcement ratio. The ultimate shear strength decreased with the increasing of … More column height. These strengths are similar to those of square columns.(3) The shear strength of octagonal columns can be calculated conservatively using the existing shear strength equations by replacing the octagonal sections with squares having the same gross area and same reinforcement.(4) The test results indicate that the shear carried by truss mechanism involving spiral reinforcement (Qut) is well represented by the 45゜ truss model and the remainder shear can be expressed by the (1+<eta>_0) times ofthe shear carried by arch mechanism (Qua). Where <wta>_0 is the axial compressive stress factor (=N/A・Fc, A is the cross-sectional area of column). The shear strength equation for reinforced concrete columns, Qu(=Qut+Qua), is as the same as the B method, which is the one now under consideration for a new shear design equation in the Architectural Institute of Japan.(5) The current empirical equations and several countries' code equations for shear strength are investigated according to 118 available date of the most recent experiments. As mentioned in (4), the modified shear design equation of the AIJ [Qu=Qut+(1+<eta>_0)Qua] is in better agreement with test date. Less

本研究的目的是根据28日的循环载荷试验，澄清以下事项（分为2个系列，每个系列14个，1）定量确定影响螺旋箍筋混凝土八角形柱抗剪承载力的各种因素根据近年来的试验资料，对钢筋混凝土柱抗剪承载力试验公式和各国规范公式的适用性进行了评述，结果表明：（1）八角形螺旋箍筋柱的开裂和剪切破坏现象与普通方箍柱相似; (2)随着混凝土强度（Fc）、轴压（N）、螺旋配筋率和纵向配筋率的增加，螺旋配筋混凝土柱的抗剪承载力逐渐增大。极限抗剪强度随掺量的增加而降低 ...更多信息列高。这些强度类似于方柱的强度。(3)利用现有的抗剪强度公式，将八角形截面替换为具有相同总面积和相同配筋的正方形截面，可以保守地计算八角形柱的抗剪强度。(4)试验结果表明，45 °桁架模型能够很好地代表螺旋钢筋桁架机构（Qut）所承受的剪力，剩余剪力可以用<eta>拱机构（Qua）所承受剪力的（1+ _0）倍来表示。式中<wta>_0为轴向压应力系数（=N/A·Fc，A为柱的横截面积）。钢筋混凝土柱的抗剪强度公式Qu（=Qut+Qua）与B法相同，后者是日本建筑学会正在考虑的一种新的抗剪设计公式。(5)根据118个现有的试验资料，对现行的抗剪强度经验公式和各国规范公式进行了比较。如（4）所述，修正后的AIJ抗剪设计公式[Qu=Qut+（1+<eta>_0）Qua]与试验结果吻合较好。少