地震作用下平板有效宽度试验研究
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摘要
基于振动台试验研究地震作用下钢筋混凝土平板结构有效宽度。主要研究转角处采用工字钢或槽钢(剪切头)剪切冲孔加固的板-柱连接件的性能。为此,建立平板的1∶2缩尺模型,平板由4种箱式钢柱支撑,承受逐步增加的模拟地震作用。试验结果表明:随着模拟地震作用强度的增加,有效宽度逐渐增加;同时,模拟地震作用造成的应变逆转使得钢筋与混凝土间粘结力减小,这将限制有限宽度的增加。此外,由于所使用的抗冲切钢材具有加固效果,有限宽度的试验结果与该文中所给公式的计算结果有着显著差异。
This paper investigates the effective width of reinforced concrete flat slab structures subjected to seismic loading on the basis of dynamic shaking table tests. The study is focussed on the behavior of corner slab-column connections with structural steel I- or channel-shaped sections (shearheads) as shear punching reinforcement. To this end, a 1/2 scale test model consisting of a flat slab supported on four box-type steel columns was subjected to several seismic simulations of increasing intensity. It is found from the test results that the effective width tends to increase with the intensity of the seismic simulation, and this increase is limited by the degradation of adherence between reinforcing steel and concrete induced by the strain reversals caused by the earthquake. Also, significant differences are found between the effective width obtained from the tests and the values predicted by formula proposed in the literature. These differences are attributed to the stiffening effect provided by the steel profiles that constitute the punching shear reinforcement.
This paper investigates the effective width of reinforced concrete flat slab structures subjected to seismic loading on the basis of dynamic shaking table tests. The study is focussed on the behavior of corner slab-column connections with structural steel I- or channel-shaped sections (shearheads) as shear punching reinforcement. To this end, a 1/2 scale test model consisting of a flat slab supported on four box-type steel columns was subjected to several seismic simulations of increasing intensity. It is found from the test results that the effective width tends to increase with the intensity of the seismic simulation, and this increase is limited by the degradation of adherence between reinforcing steel and concrete induced by the strain reversals caused by the earthquake. Also, significant differences are found between the effective width obtained from the tests and the values predicted by formula proposed in the literature. These differences are attributed to the stiffening effect provided by the steel profiles that constitute the punching shear reinforcement.
引文
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