分段外包钢板箍RC柱抗震性能的试验研究

本文依据钢筋混凝土高轴压中短柱的震害特征,考虑到约束混凝土的强度大和变形性能好等特点,对中短柱进行分段外包钢板箍。期望提高其承载能力和变形能力,达到变强弯弱剪构件为弯曲破坏,以提高其抗震性能。本研究着重探讨了剪跨比为1,2,3的中短柱,在定轴压及反复弯剪作用下的强度、变形、抗倒塌性能。分析对比了不同外包形式、不同轴压比下其恢复力特性和耗能效果。对钢板箍约束效应在理论上进行推导,提出了外包钢板箍钢筋混凝土高轴压柱的抗剪强度计算公式及变形计算公式、构造要求,可用于高层结构设计和现有建筑物的抗震加固设计及震后修复。

An Experiment Study on the Seismic Behavior of SPH-Confined Short Column With Compression,Moment and Shearing

During the strong earthquake the damage to high axial loaded RC col-umns has been usually found. The strength and the deformation capacity of the confinedconcrete are great. If the RC short columns are confined by the steel plate hoops (SPH)the bearing capacity of the RC columns rise and transform the shearing failure of columnto the flexure failure of flexure-shearing failure and so the aseimatic behavior will be im-proved, and the bearing capacity and the deformation property of the high axial loadedcolumns with compression, moment and shearing are discussed. The influence of theshear span ratio, confined length and the compression loading on the hysteresis behavior,ductility and the energy dissipation is analyzed. The confined effect of the SPH is derivedtheoretically, on which the formulas for calculating the shearing strength and thedeformation and the detail of the SPH-confined RC columns have been proposed, whichmay be adopted in the design oF the tall buildings and the reconstructed design of thebuildings in earthquake areas.