考虑填充墙的RC框架结构性能指标限值确定方法

A METHOD TO CALCULATE PERFORMANCE INDEX LIMITS FOR INFILLED RC FRAMES

  • 摘要: 填充墙钢筋混凝土(RC)框架结构是我国应用最为广泛的结构形式之一,而我国规范中给出的此类结构性能指标限值并未充分考虑填充墙对整体结构破坏状态的影响。遵循我国规范中对结构破坏状态的定义原则,提出基于构件破坏率的填充墙RC框架结构性能指标限值确定方法,为此类结构破坏状态与工程需求参数对应关系的研究提供新的思路。以典型结构为例建立数值分析模型,采用该文方法计算考虑填充墙的RC框架结构性能指标限值,并与不考虑填充墙的“纯框架”限值进行了对比分析。相较于“纯框架指标”,该文指标完好、轻微破坏、中等破坏和严重破坏四个破坏状态的层间位移角上限值均更小,其中,完好状态的上限值为1/832,远小于规范中规定的弹性层间位移角限值1/550,说明判定填充墙RC框架结构的破坏状态时,直接应用规范限值会低估结构的破坏程度。

     

    Abstract: The infilled reinforced concrete (RC) frame structures are widely distributed in China, and the performance index limits of such structures proposed in Chinese seismic code do not fully consider the influence of infills on the damage state of the structure. Following the principle of defining the damage state in Chinese seismic code, a method for determining the performance index limits of infilled RC frame structures based on the damage rate of components was proposed to provide a new research idea for the establishment of the correspondence between damage states of such structures and engineering demand parameters. The numerical model of a typical structure was established to calculate the performance index limits by the method proposed. The performance index limits obtained were compared with the performance index limits without considering infills. Compared with the index limits without considering the infills, the upper limits of the inter-story drift ratio obtained are smaller for the four damage states such as intact, slight damage, moderate damage and, severe damage. The upper limit of inter-story drift ratio for the intact condition is 1/832, which is much smaller than the elastic inter-story drift ratio limit (1/550) in Chinese code. The application of the inter-story drift ratio limits in Chinese seismic code to evaluate the damage state of infilled RC frame structures will underestimate the damage degree.

     

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