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INTRODUCTION Externally bonded fiber reinforced polymer (FRP) composites can be used to improve the flexural strength of structural members. To evaluate the flex-ural performance of the strengthened members, it is necessary to study the flexural stiffness of FRP- strengthened RC members at different stages, such as pre-cracking, post-cracking and post-yielding. Up to now, only very few studies were focused on the structural members strengthened under pre-loading or pre-cracking (Arduin… 相似文献
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EFFECT OF CORROSION ON BOND BEHAVIOR AND BENDING STRENGTH OF REINFORCED CONCRETE BEAMS 总被引:1,自引:0,他引:1
INTRODUCTIONThereisgrowingconcernforcorrosiondam ageinreinforcedconcrete (RC)structureswithseveraldecades’service.Thereinforcementcor rosionofRCconstructionsprobablyisthemostsignificantproblemandoutweighsotherformsofdeterioration .StudiesbyPeattieetal.( 1 9… 相似文献
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由于跨海桥梁的环境效应有别于一般桥梁,正常使用极限状态所对应的目标可靠度也必然不同,因此,基于JCSS模式规范建议了目标可靠度指标分别为1.5,2.0和2.3的跨海桥梁基础结构正常使用极限状态三级可靠度水平,并提出了一种可变荷载系数的标定新方法,即通过各类荷载引起的钢筋拉应力对于混凝土裂缝宽度的贡献率不同建立基于钢筋拉应力的正常使用极限状态方程.最后,依据可靠度计算的校准法,结合具体工程进行了基于目标可靠度的可变荷载频遇值系数和准永久值系数的标定,通过设计实践证明所建议的目标可靠度指标值是合理的,采用的标定新方法是可行的. 相似文献
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A real-size experiment on 11 tubes was done to study the performance of centrifugal concrete-filled steel tubes under bending
and torsion. This paper first introduces the relevant operating method, equipment, subjects and processes. The factors that
affect deformation and stiffness and the break mechanism under different loading were studied. Experimental stress analysis
showed that the values of practical critical stress of steel tubes accorded well with the MISES Yielding Rule. The correlative
equation (on the bearing capacity of a structural member under bending and torsion) deduced in this study may provide valuable
reference for the design of this structural member.
Project supported by the Zhejiang Province Electric Power Designing Institute and the Electric Power Ministry of China 相似文献
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针对海洋环境中的钢筋混凝土结构,基于某混凝土港口4个泊位的自然暴露检测数据(暴露时间分别为1.5,1.5,4,15年),提出了一个基于可靠性的混凝土结构耐久性定量化设计方法.基于检测得到的200多条混凝土中氯离子含量随侵蚀深度的分布曲线,对表面氯离子浓度与高程的关系进行了讨论,进一步提出了考虑环境温度、氯离子浓度、龄期系数和高程等因素的表观氯离子扩散系数的计算公式.然后,依据Fick第二定律,建立了基于可靠度的钢筋混凝土结构耐久性概率预测方法.讨论了混凝土氯离子侵蚀深度预测值、浸润时间比和高程的关系,建立了以海水浸润时间比为指标的海洋环境区划体系.最后,建立针对环境区划体系的分区设计方法,包括了标准试件的分区设计规定和不同水胶比、设计年限、温度、氯离子含量修正系数的分区设计规定体系. 相似文献
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