带楼板空间RC框架夹心节点抗震性能试验研究

发布时间：2018-06-16 00:04

本文选题：传统节点 + 夹心节点　；参考：《建筑结构》2016年24期

【摘要】：有关抗震设计和施工规范要求节点核心区浇筑与柱相同强度等级的混凝土从而形成传统节点,但这会产生支模困难、施工缝难以处理、施工质量不易保证等问题。节点核心区浇筑与梁板相同强度等级的混凝土,当梁柱混凝土强度相差超过2个等级时形成所谓的夹心节点,则可能解决这些问题,但其抗震性能尚不明确。为了研究夹心节点与传统节点抗震性能的区别,对2组4个分别相差3个与4个强度等级的传统节点与夹心节点进行了低周往复试验。试验结果表明,除梁柱相差4个强度等级的夹心节点发生节点区剪切破坏外,其余3个试件均发生梁端弯曲破坏;在中低轴压比条件下,当梁柱混凝土强度之比小于1.5时,节点区可直接采用与梁相同强度等级的混凝土浇筑;夹心节点的梁端承载力、梁纵筋粘结锚固能力、变形及耗能能力略低于传统节点。
[Abstract]:The code for seismic design and construction requires that concrete with the same strength grade as the column should be placed in the core area of the joint to form the traditional joint, but this will lead to the difficulty of supporting the formwork, the difficulty of handling the construction joint, and the difficulty of ensuring the construction quality. When the concrete with the same strength grade as the beam-slab is placed in the core area of the joint, the so-called sandwich joint may be formed when the strength difference of the Liang Zhu concrete is more than two grades, but the seismic performance of the concrete is not clear. In order to study the difference of seismic performance between sandwich joints and traditional joints, two groups of traditional joints and sandwich joints with 3 and 4 strength grades were tested on low cycle reciprocating tests. The test results show that the beam end bending failure occurs in all the other three specimens except for the sandwich joints with four different strength grades of Liang Zhu, and when the strength ratio of Liang Zhu concrete is less than 1.5 under the condition of low axial compression ratio, Concrete pouring with the same strength as the beam can be used directly in the joint area, and the bearing capacity of the beam end, the bond and anchoring capacity of the longitudinal reinforcement, the deformation and the energy dissipation capacity of the sandwich joints are slightly lower than those of the traditional joints.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中铁建设集团有限公司;
【基金】：国家自然科学基金项目(51378039,51421005) 教育部学术创新团队“土木抗震减震”和北京市属高等学校创新团队建设与教师职业发展计划项目资助
【分类号】：TU375.4;TU352.11

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