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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。
The seismic design and construction codes require that the core of the node be poured with concrete of the same strength grade as the column to form the traditional node, but this will result in problems such as difficult mold support, difficult construction joints and poor construction quality. Pouring concrete with the same strength grade as that of the slab in the core area of the node may form a so-called sandwich node when the strength of the beam-column concrete differs by more than 2 levels, which may solve these problems but its seismic performance is not yet known. In order to study the difference between the seismic performance of a sandwich node and a traditional node, low-cycle reciprocal tests were conducted on two groups of 4 traditional nodes and 4 sandwich nodes, which were different by 3 and 4 respectively. The test results show that the beam bending failure occurs in the other three specimens except for the joint failure of the sandwich joints with four different strength levels. When the beam-column concrete strength When the ratio is less than 1.5, the concrete pouring with the same strength level as the beam can be used directly in the node area. The beam end bearing capacity, the anchorage ability, deformation and energy dissipation capacity of the beam are slightly lower than those of the traditional joints.