Flexural Behaviour of High－Strength Steel Fiber－Reinforced Concrete Beams

ＦｌｅｘｕｒａｌＢｅｈａｖｉｏｕｒｏｆＨｉｇｈ－ＳｔｒｅｎｇｔｈＳｔｅｅｌＦｉｂｅｒ－ＲｅｉｎｆｏｒｃｅｄＣｏｎｃｒｅｔｅＢｅａｍｓＱｉａｎＣｈｕｎｘｉａｎｇ（钱春香）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉ...     

540MPa级高强度滚型车轮用钢的研制与应用

通过在碳锰钢的基础上添加Nb微合金化元素,成功开发出珠光体占10%的铁素体＋珠光体组织的高强度车轮用钢,该钢钢质纯净、晶粒细小、强度高、成形性能优良,已成功应用于轿车轮辋制造。     

新FRP技术加固钢筋混凝土矩形柱改善延性的试验研究

Reinforced concrete （RC） columns lacking adequately detailed transverse reinforcement do not possess the necessary ductility to dissipate seismic energy during a major earthquake without severe strength degradation. In this paper, a new retrofit method, which utilized fiber-reinforced plastics （FRP） confinement mechanism and anchorage of embedded bars, was developed aiming to retrofit non-ductile large RC rectangular columns to prevent the damage of the plastic hinges. Carbon FRP （CFRP） sheets and glass FRP （GFRP） bars were used in this test, and five scaled RC columns were tested to examine the function of this new method for improving the ductility of columns. Responses of columns were examined before and after being retrofitted. Test results indicate that this new composite method can be very effective to improve the anti-seismic behavior of non-ductile RC columns compared with normal CFRP sheets retrofitted column.     

拟静力试验桥墩的损伤评价

钢筋混凝土构件的抗震性能,包括强度、刚度、强度退化、刚度退化、延性、能量耗散、构件破坏等的变化规律。本文从地震作用下结构（构件）损伤评价出发,采用九个墩柱的破坏性试验数据,通过基于位移延性系数的损伤评价模型和经典损伤评价模型对试验墩柱的损伤程度进行了评价,并比较了两种评价方法的适用性。     

框剪结构抗震性能的改善

通过对框剪结构的受力分析，提出了抗震概念设计的一般原则，并针对框剪结构提出了诸多改善抗震性能的措施和设计方法。     

框架梁端新型人工塑性铰理论分析

提出一种框架梁端腹中开水平缝新型人工塑性铰方案,且建立了其内力和承载力计算公式.并在此基础上,进一步分析了该人工塑性铰的转移条件、开缝位置及开缝长度,分析并提出了该新型人工塑性铰的延性系数计算方法,计算结果与试验结果比较,吻合较好,完善了该人工塑性铰的设计理论.,Opening horizontal slit in the middle web of the beam end formed a new type of artificial plastic hinge. The calculation formulas about the hinge's interior force and bearing capacity are set up. Based on these, the condition of transfer, the location of crack and the cracking length of the artificial plastic hinge were studied further. The calculation method for the ductility factor was also presented. The calculation results and the test ones were compatible.     

砖混结构建筑抗震加固技术分析

我国砖混结构建筑存量大,大部分抗震性能差,抗震加固形势紧迫。针对几种常用砖混结构抗震加固技术,从施工、造价、力学性能、适用范围等方面进行综合分析,并提出一种施工简单、造价适中、力学性能合理、适用范围广的新型抗震加固技术——高延性砂浆夹碳纤维网格布新技术。介绍其应用及研究情况,指出需要进一步研究的内容,对合理选择砖混建筑加固技术和未来研究方向有重要参考价值。     

轧后冷却工艺对低碳低硅钢组织与性能的影响

研究了轧后不同快速冷却工艺对低碳低硅钢组织及性能的影响。试验结果表明,轧后快冷返红温度为600℃时,试验钢的冲击韧性最好;返红温度为550℃时,钢的强度有所上升但塑性降低,冲击韧性有所下降;返红温度控制在650℃时,粗大碳化物从奥氏体晶界析出,导致低温韧性显著降低。     

抗震条件下底部框剪砌体房屋检测鉴定方法

对底部框剪砌体房屋地震作用产生裂缝的原因进行分析,提出了在检测过程中应综合考虑此类结构的刚度、强度和延性的方法,对房屋检测有相当的参考价值·