有粘结预应力混凝土结构施工的质量监督

简介某有粘结预应力混凝土工程的质量监督作法。     

JC/T 2602—2021《预应力混凝土U形板桩》标准解读

为便于JC/T 2602—2021《预应力混凝土U形板桩》的使用方准确理解标准条款的具体含义,正确贯彻实施标准条款的具体要求和规定,简述了该标准的编制背景、编制目的和意义,解释说明了标准条款的具体内容,并提出了实施过程中应注意的问题.     

大跨度预应力型钢混凝土框架结构施工技术

泉州市行政管理服务中心7#、8#楼为典型大跨度预应力型钢混凝土框架结构。本文探讨了预应力型钢混凝土梁柱型钢的安装、钢筋及预应力筋的安装及施工难点,重点介绍梁柱节点区型钢、钢筋、预应力筋施工上的做法。     

预应力碳纤维布加固混凝土梁有限元分析

利用碳纤维布(CFRP)加固钢筋混凝土构件是一种先进的工程加固技术,已经在土木工程中得到了较为广泛的应用。本文应用ANSYS软件对碳纤维加固预应力和非预应力梁体受弯进行仿真,来分析和研究碳纤维加固混凝土梁的受力机理和加固效果,并给出了相应的荷载挠度曲线。结果表明应用预应力碳纤维的梁体明显优于普通碳纤维布加固的受损梁,不仅提高了结构各阶段的承载力而且降低了梁破坏时的挠度。     

大跨度先张法预应力混凝土双T板的生产

大跨度先张法预应力混凝土双T板具有跨度大、结构性能好、成本低、整体性好等特点,被广泛应用于工业建筑.结合实际工程,介绍了大跨度双T板的生产工艺,并重点阐述了钢绞线张拉、预应力控制、混凝土浇筑和养护工艺,可为大跨度双T板的生产应用提供参考.     

Effects of prestressing the reinforcement on the behavior of reinforced granular beds overlying weak soil

The effects of prestressing the reinforcement on the strength improvement and settlement reduction of a reinforced granular bed overlying weak soil are being investigated through a series of laboratory scale bearing capacity tests. The influences of parameters such as strength of underlying weak soil, thickness of granular bed, magnitude of prestressing force, direction of prestressing forces and number of layers of reinforcement are being examined. Finite element analyses are carried out using the FE program PLAXIS to study the effect of prestressing the reinforcement. Results obtained from finite element analyses are found to be in reasonably good agreement with the experimental results.     

Cyclic behavior of prefabricated circular composite columns with low steel ratio

Improved economy and speed of construction can be achieved through the use of prefabricated structural members. As a step toward the advancement of prefabricated substructures, a precast composite column for seismic regions is proposed in this paper. Concrete-encased composite columns with core structural steel can be utilized for a fast construction method using steel connections. Six concrete-encased composite specimens with low steel ratio were fabricated. Quasi-static tests were conducted to investigate the cyclic response of the prefabricated composite columns. For composite columns with bolt connections, the cyclic behavior in terms of ultimate load and post-cracking behavior was enhanced significantly as the transverse reinforcement ratio increases. Higher prestressing gave greater flexural strength to the composite columns with prestressing and better energy absorption capacity, while displacement ductility of the prestressed composite column was decreased as the prestressing increased.     

部分粘接预应力抗拔桩静荷载实验下的桩身受力分析

传统的抗拔桩在承受抗拔荷载时,桩身混凝土受到拉伸,这样导致抗拔桩在没有承受多大的抗拔力的情况下,桩身混凝土已经发生拉伸破坏而产生裂隙,随后桩身钢筋结构锈蚀破坏.预应力抗拔桩有效改善了普通抗拔桩的桩身结构,能充分发挥抗拔桩的承载力,解决了普通抗拔桩所不能解决的问题.部分粘接是解决抗拔桩上施加预应力的一种方法和手段.通过现场实际的部分粘接预应力抗拔桩荷载试验,了解部分粘接预应力抗拔桩的桩身受力情况,为进一步完善预应力抗拔桩的受力机理分析提供了可靠的试验依据.     

预应力端部分散锚固的局压强度研究

本文通过试验研究预应力端部分散锚固的局压强度 ,探讨了工程实际中的局压破坏机理 ,提出预应力端部分散锚固的局压承载力受外围混凝土约束不明显     

无粘结预应力混凝土开洞平板的受力性能研究

通过对无粘结预应力开洞平板的受力性能的试验研究,对由于开洞引起的洞口周边应力集中、应力分布状况变化及洞口对平板抗弯刚度的削弱等问题进行了分析论述。