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尝试将我国《冷弯薄壁型钢结构技术规范》(GB50018-2002)用于计算比Q345钢强度更高的钢材制成的冷弯薄壁型钢结构柱。将我国“规范”(GB50018-2002)计算结果与试验、有限元分析结果和国外规范计算结果比较发现,卷边槽钢和壁厚不大于3mm的卷边角钢偏于安全,壁厚在3mm以上的卷边角钢可通过对稳定系数φ乘一修正系数以保证安全。 相似文献
87.
Influence analysis of bracket set on seismic performance of steel eave columns in Chinese traditional style buildings 下载免费PDF全文
Jianyang Xue Linlin Ma Zhanjing Wu Weixin Gao 《The Structural Design of Tall and Special Buildings》2018,27(8)
This paper presents influence analysis of bracket set on seismic performance of steel eave columns in Chinese traditional style buildings. Eight 1/1.5‐scale steel eave columns were constructed and tested under low cyclic reversed loading, including 4 specimens with bracket set and 4 specimens without bracket set. Based on the analysis of the strain of the specimens, the failure modes of the specimens were obtained. In addition, the hysteresis loops, skeleton curves, degradations of stiffness and strength, ductility, and dissipation capacities of the specimens were analyzed. Bracket set changed the force transfer mechanisms and failure modes of the specimens and had a significant influence on the seismic performance of the specimens. Compared with the specimens without bracket set, the yielded and ultimate bearing capacities of the specimens with bracket set improved by 30.7% and 24.0%, respectively. And also, the stiffness of the specimens with bracket set at the yielded and ultimate points increased by 52.8% and 135.6%. The dissipation capacities of the specimens with bracket set were 2.12 times those of the specimens without bracket set at yielded load. However, the ductility of the specimens with bracket set slightly decreased by 8.5%. It was shown that the seismic performance of the specimens with bracket set was better than that of the specimens without bracket set. The work in this paper provides a basis for further theoretical study on the seismic performance of steel eave columns in Chinese traditional style buildings. 相似文献
88.
为研究机载布撒器囊式抛撒系统中气囊的抛撒性能,以初始为扁平结构的薄壁金属(304不锈钢)气囊为研究对象,采用流固耦合的方法对其膨胀抛弹过程展开数值仿真分析,得到囊内的流场特性和囊壁的应力响应,计算结果与试验吻合较好.分析了入口边界条件及气囊结构对抛撒结果的影响,计算结果表明:气囊入口直径和入口边界条件是影响子弹分离速度和过载的关键因素,装药量、入口直径越大,子弹过载越大;一定装药量下,气囊入口直径不同时,子弹存在极限分离速度;气囊初始面积对子弹分离速度影响很小(仅4%),主要影响囊内的燃气压力,初始面积越大囊压越小,有利于降低囊壁的应力值.计算结果可为气囊结构的优化设计与工程实际应用提供重要参考. 相似文献
89.
F. Schnaid D. Winter A.E.F. Silva D. Alexiew V. Küster 《Geotextiles and Geomembranes》2017,45(3):227-236
Geosynthetic Encased Sand Columns (GEC) have been frequently adopted in geo-engineering practice to improve bearing capacity, reduce settlements and accelerate consolidation in saturated soft cohesive ground (e.g. Alexiew et al, 2005; Alexiew et al., 2012; Raithel et al, 2005). The present paper extends these early views by introducing the use of columns to reduce the magnitude of horizontal earth pressures acting on structures adjacent to compaction fills. The monitoring program of a full-scale bridge abutment on soft soil supported by GECs and geogrid reinforced system is described, where field performance is monitored with pressure cells, electrical piezometers, inclinometers and settlement plates. Analytical and numerical analyses have been performed to help on interpreting experimental measurements. The collected database is interpreted to demonstrate that GEC can reduce by up to 50% the horizontal earth pressure over bridge border foundation piles when compared to values predicted for unreinforced ground and demonstrate that the work conformed to acceptable limits of behavior. 相似文献
90.
《International Journal of Hydrogen Energy》2019,44(38):21067-21079
Pipelines are the most efficient method of transporting large quantities of hydrogen, and the low volumetric energy density of gaseous hydrogen requires that the gas must be compressed to extremely high pressure to be used as a transport fuel. The failure of high pressure hydrogen gas pipelines and subsequent explosion may induce heavy damage to buildings. In this paper, such an issue is addressed for existing reinforced concrete framed buildings and tuff stone masonry buildings. Physical features such as the gas jet release process, flammable cloud size, blast generation and propagation, and explosion effects on structural components of buildings are considered and evaluated through the SLAB integral model, Multi-Energy Method and pressure‒impulse diagrams. Damage to both types of structural components was evaluated and the maximum distance of blast damage was derived in several environmental conditions, contributing to land-use planning and performance-based design/assessment of pipelines and buildings. 相似文献