全学友  孙会郎　（重庆大学土木工程学院  400045）

[提要]  将后浇带所在跨的楼面结构视为偏拉杆件模型，并在此基础上推导出给定跨度发生△变化时的约束
拉力计算公式。分析表明，在其它条件不变的情况下，连续钢筋数量、后浇带宽度以及连续钢筋重心位置对约束拉力的大小有明显影响。穿越后浇带的连续钢筋面积越大，则约束拉力越大；后浇带宽度越大，则约束拉力越小；同等连续钢筋面积的情况下，钢筋重心位置离梁截面的形心越远，则约束拉力越小。
[关键词]  后浇带  连续钢筋  抗裂  约束拉力

When floor beam-slab,in which span post-poured strip settled,is taken as eccentrically stretched element, and when span variation△is prescribed, formula for evaluating restraining tensile force is established. The formula tells that, when other things unchanged, such factors as area of continuous bars, width of post-poured strip, as well as center height of total continuous bars, have great influence on the restraining tensile force.The greater is the continuous bar area,the greater is the restraining tensile force. The wider is the post-poured strip, the smaller is the force. And the further is the distance of center of total continuous bars from the center of the beam section,the smaller is the force.
Keywords:  post-poured strip; continuous bars; crack resistance; restraining tensile force

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