摘要
通过单向和双向两种加载方式下空间夹心节点(即核心区采用同梁等强的低强度混凝土浇筑的节点)的低周往复荷载试验,研究了不同加载方式对夹心节点的破坏形式、破坏程度、延性、耗能、刚度退化的影响。结果表明:单向和双向加载方式下,夹心节点的破坏形式以梁纵筋屈服后节点核心区的破坏为主,但双向加载方式下节点的破坏程度更为严重,且延性有所降低;双向荷载的耦合作用降低了节点的抗剪承载力,在设计中仅考虑单方向地震作用是不安全的;两种加载方式对节点耗能性能和刚度退化的影响不明显。
3D sandwich joints cast core area with weaker strength concrete of beam are tested under unidirectional or bi-directional reversed cyclic loads, the seismic performances, including the failure mode, damage, ductility, energy dissipation, rigidity degeneration are studied. The test results show that： under unidirectional or bi-directional loads, sandwich node damage form is mainly the shear destruction after the beam longitudinal reinforcement yield, but the node damage of bidirectional loading mode is more serious, and the ductility decreases; two-way coupling effect of the load reduces the shear bearing capacity of node, single direction seismic action considered in the design is not safe; the effect of loading modes on the performance of node energy dissipation and stiffness degradation is not obvious.
出处
《工程抗震与加固改造》
北大核心
2016年第6期78-84,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金资助项目(51421005)
