李少泉    沙镇平          （厦门大学  厦门 361005）

[提要]  通过对受不同方向的地震作用的一典型空间钢筋混凝土框架结构的强度分析，对目前采用的计算模型（即对相互正交的两个主轴方向分别进行内力及强度设计）提出质疑，指出构件的最不利受力状态随构件的不同和地震作用方向的不同而不同；并解释了实际结构难以实现强柱弱梁的主要原因，以及角柱震害普遍严重的主要原因。计算分析表明，在目前的计算模型下，无论是从结构强度的角度上讲，还是从强柱弱梁的抗震设计原则上讲，均需提高柱的设计强度。
[关键词]  空间结构  强度分析  双向偏心受压柱

Under the different direction seismic action,the strength of a typical space reinforced concrete frame is analyzed. The strength problem of the frames is revealed. The existing calculating model is queried which is strength analysis and design to orthogonal two major axis of structures separately. It is pointed out that the worst-case members in force are different with members and direction seismic action. The main reasons are explained why actual structures are hard to bring about the strong column-weak beam, ancl why the seismic calamity of corner columns is serious unlversally. It is indicated by the results that the strength of columns is increased.
Keywords: space structure; frame; strength analysis; two-way column; seismic design