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Assessment of RC moment frame buildings in moderate seismic zones: Evaluation of Egyptian seismic code implications and system configuration effects

机译：评估中等地震带中的钢筋混凝土弯矩框架建筑物：评估埃及地震法规的含义和系统配置效果

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Building code restrictive seismic design provisions and building systems type and configuration have remarkable implications on seismic performance of reinforced concrete moment framed structures. Seismic assessment of ductile versions of low- to mid-rise moment frames located in moderate seismic zones is carried out through comparative trial designs of two (4- and 8-story) buildings adopting both space and perimeter framed approaches. Code-compliant designs, as well as a proposed modified code design relaxing design drift demands for the investigated buildings, are examined to test their effectiveness and reliability. Fragility curves for the frames are generated corresponding to various code-specified performance levels. Code preset lower or upper bounds on either design acceleration or drift, respectively, that would control the final design are also addressed along with their implications, if imposed, on the frames' seismic performance. The trial design study demonstrates that built-in static overstrength is generally larger for space frames than for perimeter frames, whereas the force reduction attributable to inelastic dynamic response differs from one frame type to the other for various investigated heights and for different target performance levels. Nonetheless, all trial designs are shown to meet the minimum performance implied by building code provisions but with varying margins. However, the study suggests that more consistent reliability for designed structures can be achieved by disaggregating the force reduction factor into its static and dynamic parts and that code default values of this factor for some building types would be better reduced for a more reliable performance.
机译：建筑规范的抗震设计规定以及建筑系统的类型和配置对钢筋混凝土弯矩框架结构的抗震性能具有重大影响。通过采用空间和周边框架方法对两座（4层和8层）建筑物的对比试验设计，对位于中等地震带的低至中层弯矩框架的延性版本进行了地震评估。检验了符合代码规范的设计以及拟议的修改后的代码设计，以减轻被调查建筑物的设计漂移要求，以测试其有效性和可靠性。对应于各种代码指定的性能级别，生成帧的易碎性曲线。还规定了分别控制最终设计的设计加速度或漂移的代码预设下限或上限，以及它们对框架抗震性能的影响（如果有的话）。初步设计研究表明，对于空间框架，内置的静态超强度通常要比外围框架大，而对于不同的研究高度和不同的目标性能水平，非弹性动力响应所导致的力降低因一种框架类型而有所不同。但是，所有试验设计均显示出满足建筑规范规定所隐含的最低性能，但具有不同的余量。但是，研究表明，通过将力减小因子分解为静态和动态部分，可以实现设计结构的更一致的可靠性，并且对于某些建筑物类型，可以更好地降低该因子的代码默认值，以实现更可靠的性能。

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