Test on Seismic Behavior of Diaphragm-through Irregular Joints of Lightweight Aggregate Concrete-filled Square Steel Tubular Column and H-section Steel Beam and Steel Box Beam(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年01期
- Page:
- 40-51
- Research Field:
- Publishing date:
Info
- Title:
- Test on Seismic Behavior of Diaphragm-through Irregular Joints of Lightweight Aggregate Concrete-filled Square Steel Tubular Column and H-section Steel Beam and Steel Box Beam
- Author(s):
- WANG Wan-zhen; LI Hua; GUO Ming-ming; ZHU Fang; SUN Shao-jiang
- Faculty of Architectural, Civil Engineering and Environment, Ningbo University
- Keywords:
- irregular joint of lightweight aggregate concrete-filled square steel tubular column and H-section steel beam and steel box beam; cyclic loading test; seismic performance; bearing capacity; plastic rotation; energy dissipation capacity
- PACS:
- -
- DOI:
- -
- Abstract:
- Diaphragm-through irregular joints of lightweight aggregate concrete-filled square steel tubular column and H-section steel beam and steel box beam, including irregular joints with strengthened arc junctures and traditional irregular joint, were tested under cyclic loading to comparatively study on the influence of strengthened arc junctures on seismic performance of the irregular joints. The failure modes, hysteresis loops, bearing capacities and plastic rotations of the irregular joints were obtained from the experimental results. The flexural and shear calculation models in panel zone of the irregular joint were established and formulas for calculating the flexural and shear capacity were presented for the irregular joint under compression and bending based on the analysis of the experimental results. The tests results indicate that the hysteresis curves of the traditional irregular joint have serious deterioration，and the traditional irregular joint brittle fractures at the edges of butt weld of box steel beam flanges with large rigidity and sharply changed geometry. The hysteresis curves of the diaphragm-through irregular joints are plump shuttle shape，and the hysteresis curves have no obvious bearing capacity and stiffness degradation. The main failure modes of the irregular joints with strengthened arc junctures are plastic hinge formed at the enlarged arc junctures, crack of fillet at welding holes of beam web and ductile fracture of butt weld of beam flanges. There are no tearing failures of welding between diaphragm-through ribs and column walls until joints failure. The post-test examination on the specimens does not reveal any lightweight aggregate concrete materials failure in all tested specimens. The lightweight aggregate concrete and diaphragm-through ribs and column walls are firmly bonded together without separated or slip failure. The plastic rotation of the irregular joints with strengthened arc junctures can research 0.038-0.056 rad, and the bearing capacity may increase by 21.5%-56.2% compared with that of the traditional irregular joint, respectively.
Last Update: 2018-02-01