Results 71 to 80 of about 1,124 (175)
Jianzhu Gangjiegou Jinzhan高大施工支架是大跨度复杂桥梁工程中常用的钢结构支撑系统。实际工程中由于受到高大施工支架加工安装误差、超限受力或不均匀受力等因素影响，因此钢结构施工支架存在节点连接不牢固、杆件弯曲变形等初始缺陷。为明确初始缺陷对桥梁高大施工支架整体稳定性能的影响规律，首先开展了桥梁高大施工支架的线性屈曲分析，进而探讨了节点半刚性、杆件初弯曲等初始缺陷对桥梁高大施工支架极限承载力的影响规律。为提高桥梁高大施工支架极限承载力的求解精度，引入刚度系数来衡量节点半刚性，综合考虑节点体对杆件计算长度的影响 ...
唐永 +5 more
doaj
[Design and research of a pneumatic soft intestine robot imitating the inchworm]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiHe Y +5 more
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[Development and evaluation of a positioning system for radiotherapy patient based on structured light surface imaging]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiWang Y +6 more
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[Biomechanical study of knee joint based on coronal plane alignment of the knee]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiWang Y, Xu P, Lu N, Li W, Xu S.
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Jianzhu Gangjiegou Jinzhan为解决刚接柱脚自复位装配式钢框架结构在中震或大震下底层柱可能发生较大的塑性变形的问题，设计一种半刚接柱脚自复位装配式钢框架结构。对其子结构进行拟动力试验，对比框架在Taft波、LOS000波和EL-Centro波在不同等级地震下节点开口、耗能能力、刚度退化、预应力损失、应变变化。试验结果表明，钢框架在大震作用下具有良好的自复位功能和耗能能力。钢绞线平均预应力损失最多仅1.58%，说明施加预应力的方法是可靠的。钢框架柱脚能始终保持弹性状态，从而震后仅需修复钢梁，大大减小修复成本。
张艳霞, 沈森, 李杨龙, 赵微
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Jianzhu Gangjiegou Jinzhan传统碗式节点作为一种典型装配式节点，常应用于大跨度空间网格结构，但因其抗弯刚度较小，使其应用范围受限。基于此，对传统碗式节点进行改进，提出了一种抗弯性能更好的喷头式节点。首先，对喷头式节点进行设计，并对喷头式节点与碗式节点进行了纯弯作用下的有限元模拟，对比了二者的抗弯性能；然后，研究了周围螺栓半径、轴向压力和轴向拉力对喷头式节点抗弯性能的影响；最后，建立了喷头式节点弯矩-转角的幂函数模型，采用模拟退火算法得到了该模型曲率系数，利用多元非线性拟合方法确定了相关的模型参数，并对幂函数模型进行了评估。结果表明，
李韧, 肖志成, 李会军, 李宝辉
doaj
[Effects of larval feeding amount on development and deltamethrin resistance in <i>Aedes albopictus</i>]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoWang Y, Deng W, Wu C, Tian S, Li H.
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[Effect of autologous osteochondral tissue and periosteum transplantation on tendon-bone healing of rotator cuff in rabbits]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiFang S +7 more
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Strategies for long-acting drug design. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoHuang M, Cai Z, Liu S.
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[Short-term effectiveness of expert adolescent lateral femoral nail fixation for femoral shaft fractures in older children and adolescents]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiHe X +6 more
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