【摘要】 为了降低框架结构的梁配筋,间接考虑楼板对梁的承载力贡献,以实现"强柱弱梁"的设计理念。通过对一组4层3跨的钢筋混凝土框架结构进行Etabs建模有限元分析,考虑不同形式梁对楼板刚度贡献,分析了中梁刚度放大系数取值对框架结构分析结果的影响,以考虑楼板平面外刚度与放大梁刚度2种情况的框架结构弹性基本自振周期相等原则,近似确定楼板对框架梁弹性刚度的影响范围,求出理论计算值。分析结果表明:在现有条件下,框架梁刚度放大系数取值对梁配筋的敏感性要高于柱;可以对不同设防烈度框架结构采用不同的梁刚度放大系数,以提高经济性;给出梁刚度放大系数的建议值,提出了框架柱塑性铰区梁、板之间分缝的设计建议。更多还原

【Abstract】 In order to reduce the beam reinforcement of the frame structure with the consideration of the contribution of floor to the bearing capacity of beams and achieve"strong-column and weak-beam"design,a four-story three-span reinforced concrete frame was used for the simulation by Etabs for finite element analysis,with the consideration of the contribution of different kinds of beams to the floor rigidity,to analyze the influence of amplification factor of frame beams on the frame structure.The equivalence of basic natural period of vibration theory invloving out-ofplane rigidity and amplication of beam rigidity was adopted for approximate determination of the influence range of floor on the frame elastic rigidity,and the theoretical value was deduced.The results show that the rigidity amplification factor of beams is more sensitive to the beam reinforcement than the column under current conditons;different rigidity amplification factors of beams should be applied to different seismic fortification intensities to improve the economy;the proposed value of rigidity amplification factor of beam is presented;and horizontal joints should be set in the beam’s plastic hinge zone between the beam and slab.1tab,4figs,9refs.更多还原