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本文概述了预应力屋面梁侧弯曲的形成原因及其对构件结构性能的影响,并通过试验检测和计算提出了处理方法。 相似文献
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双向叠合板拼缝传力性能的试验研究 总被引:8,自引:0,他引:8
对叠合板板侧各种拼接缝的构造及传力性能进行了试验研究,建议了合理的整体式拼缝构造形式及计算方法。本文结论适用于大跨度叠合楼板的结构设计,可减小挠度变形,提高承载力及裂缝控制能力,具有实际应用前景。 相似文献
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The images obtained by a large optical detection system (>500 mm) are always blurred by atmospheric turbulence. To address this blurring, an adaptive optical system is urgently needed. Here, a 1.3 m vehicle-based adaptive optical system (VAOS), located on the Nasmyth focus, is investigated. A two-grade tip/tilt steering mirror is used to eliminate tracking jitter and atmospheric tipping error. Pupil matching and cooperation between the deformable mirror and the wavefront sensor are adopted to achieve high-order aberration measurement and correction via closed-loop correction and to allow the telescope to obtain high-quality imaging. For different seeing conditions and site locations, the VAOS achieves the sensing over the wavelength range from 0.5 μm to 0.7 μm using a Shack-Harmann wavefront sensor and the correction with a 97-unit deformable mirror for an imaging spectrum range from 0.7 μm to 0.9 μm. Moreover, the maximum detection capability of the system is greater than a visual magnitude of 5, and the angular imaging resolution is better than 0.3". 相似文献
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利用有限体积法在非正交网格上实施了SIMPLEXT算法,该算法显式处理了邻点速度、源项及交叉导数项对速度修正值的影响,详细地给出了算法的推导过程,并对斜方腔顶盖驱动流进行了数值模拟。结果表明,在雷诺数不断增加的情况下,旋涡的数量也随之增加,同时意味着随着雷诺数的增大,惯性力也相对变大,从而对空腔内流动的作用也相应地增强,可见SIMPLEXT算法有效而准确地模拟了物理现象,同时能在相对宽的亚松弛因子上得到收敛解,具有更好的健壮性,可用于几何形状比较复杂流场的计算。 相似文献
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以三次B样条小波函数作为权函数,设计了一种无网格实用算法.以一维杆和二维板结构为例,分别采用基于Gauss权函数、三次样条权函数与三次B样条小波权函数的无网格算法进行仿真分析.计算结果表明,本文算法得到的位移、应力近似解与精确解在多尺度、稳定性方面具有比其他权函数更好的拟合效果.本文研究拓宽了无网格法在工程结构分析中的... 相似文献
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