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设置不同掉层层数、掉层跨数和坎上楼层层数的模型,对比分析各模型在不同振型数下结构响应值的误差,根据分析结果来验证常用振型数量控制方法的适用性和差异性。结果表明,高阶振型对山地结构中掉层部分的内力响应影响显著。不同的掉层结构布置对振型数的选择有重要影响,掉层层数的增加使层剪力误差超限的楼层位置从顶层转移到掉层部分,致使掉层部分对高阶振型更加敏感。伴随着掉层跨数的减少,最大层剪力误差及误差超限的楼层数均呈先增大后减小趋势,即存在最不利的掉层跨数比,此时各内力响应误差均最大。坎上楼层的增加会提高掉层部分的剪力误差值。相对于层剪力,层间位移更易于通过提高振型数来控制精度。振型位移控制法的精度较高,但会增加大量结构计算和分析成本。振型质量参与系数法仅在个别结构中的层间剪力误差较小,总体来说其控制效果较差。解决这一问题,还需进一步研究以便提出一种新的振型控制方法。
The models of different layer numbers, number of spans of strata and number of floors on the ridge were set up. The errors of the structural response values of different models at different modes were compared and analyzed. The applicability of the number control method of common mode shapes was verified by the analysis results And difference. The results show that high-order vibration modes have a significant effect on the internal force response of the delamination section in mountainous structures. Different lay-out configurations have an important influence on the choice of mode shapes. The increase of layer delamination shifts the position of floor overrun by layer shear error from the top to the off-layer, which makes the off-layer more sensitive to high-order mode. With the decrease of the number of stratified layers, the number of floors with the largest layer shear error and the error overrun first and then decrease, that is, there is the most unfavorable stratified ratio of strata, and the internal force response errors are the largest . An increase in the floor above the canopy increases the shear error value of the off-level portion. Relative to layer shear, interlayer displacement is easier to control the accuracy by increasing the number of modes. The vibration mode displacement control method has higher accuracy, but it will increase a lot of structural calculation and analysis costs. The vibration mode mass participation coefficient method only has small interlayer shear error in individual structures, and the overall control effect is poor. To solve this problem, further research is needed to propose a new mode control method.