关于桥梁加固技术的讨论

对有病害的桥梁采取有效的加固改造措施，恢复和提高桥梁的承载能力，使其继续为现代交通运输服务，可以给国家带来巨大的经济效益，也是交通工程中的重要课题。本文笔者阐述了桥梁加固的基本原则，探讨了桥梁加固常用的方法。具有重要的现实意义。     

浅谈建筑物地基处理中的注浆加固技术

在建筑工程施工中最常用的地基加固方法就是注浆加固法,运用此方法可以充分改善持力层受力状态和荷载传递性能,使地基得到有效加固,从而防止或减少渗透或不均匀沉降。本文通过分析注浆加固的概念及分类,以某工程为例针对注浆加固技术在建筑地基处理中的应用问题进行探讨,以期通过本文的阐述节约工程资金、提高工程效率,不断提升建筑地基工程质量。     

预应力碳纤维粘贴施工技术在桥梁加固中的应用

为适应我国公路桥梁养护与加固改造要求,我国各省公路管养部门开展了桥梁加固技术的试验研究和工程实践尝试,积累了丰富的实践经验。本文介绍了桥梁加固的概念以及常用方法,并重点研究了预应力碳纤维粘贴施工技术在桥梁加固中的应用。     

工程结构加固设计方法的运用

本文结合某工程结构加固设计实例，介绍了该工程中的柱、梁、板的不同加固方法，可为广大同行借鉴!     

锚固技术在深圳机场边坡加固中的应用

锚索加固是一项先进技术，在岩土加固工程中具有广阔的发展前景，本文通过实际工程，介绍了土边坡加固中锚固设计的一般方法和永久性锚索施工时应注意的问题。     

现代建筑结构的常用加固技术分析

本文通过分析房屋建筑结构加固的必要性及应遵循的基本原则,针对混凝土及钢结构建筑加固工程中的关键技术进行探讨。以期通过本文的阐述为规范既有建筑加固技术,促进现代建筑结构体系化完善提供理论参考。     

钢筋混凝土结构加固技术与应用

结合钢筋混凝土结构工程加固案例,介绍了钢筋混凝土结构加固技术,通过加固案例的分析,探讨了加固技术在钢筋混凝土结构工程中的应用.     

浅谈钢结构加固

钢结构加固在实际工程中应用越来越普遍，本文主要介绍了钢结构加固的方法及应注意的问题。     

论粘钢加固在温州某工程中的应用

建筑业的发展，推动了混凝土结构加固行业的兴起，粘钢加固在越来越多的工程里得到了应用，发挥了其作用，体现了其价值。     

型钢—混凝土组合梁在某改造加固工程中的应用

本文就型钢－混凝土组合梁在实际改造加固工程中的应用进行了详细的论述.通过不同加固方法的对比分析，说明了型钢－混凝土组合梁在砖混结构改造加固中的优越性。     

纳米SiO2填充硅橡胶的补强机理研究进展

简单介绍了纳米SiO2的表面化学性质及其粒子的聚集状态;归纳了物理吸附作用、氢键作用方式及共价键结合方式等基本的纳米SiO2与硅橡胶的作用方式;以纳米SiO2-纳米SiO2、纳米SiO2-硅橡胶的不同作用为基础列举了键合胶、复合团聚体及互穿网络模型等几种补强模型,并总结了其在补强过程中发挥的作用,从而对其补强机理研究进展进行更为详细的概括和介绍.     

Behavior of oblong and rectangular bridge columns with conventional tie and multi-spiral transverse reinforcement under combined axial and flexural loads

Abstract

This study investigates the behavior of transversely reinforced oblong and rectangular bridge columns under combined axial and flexural loading, including eccentric compression and lateral cyclic loading under constant axial load. The transverse reinforcement schemes include conventional tie and multi-spiral reinforcement. The multi-spiral reinforcement for the oblong column comprises two interlocking spirals and, for rectangular columns, comprises two interlocking large central spirals interlocked with four small spirals at the corners. The amount of transverse reinforcement for all of the columns conforms to the current seismic bridge design specifications. Test results indicate that all of the columns exhibit ductile behavior with ductility capacities significantly higher than the ductility capacity required by the design code. The oblong spiral column with an amount of transverse reinforcement 43% that of the corresponding tied column shows strength, ductility, energy dissipation, and over-strength similar to the tied column. Additionally, the rectangular spiral column with an amount of transverse reinforcement 59% that of the corresponding tied column exhibits strength, ductility, energy dissipation and over-strength superior to the tied column. Moreover, the code P-M interaction analysis method can provide a conservative means of estimating nominal moment strength. The two code methods to determine the maximum probable moment strengths may not provide conservative estimates. Results of this study demonstrate that the maximum probable moment of the columns examined can be estimated conservatively as 1.4 times the nominal moment strength.     

Load Testing of Floor Slabs in a Full-scale Reinforced Concrete Building

A series of short and long term service load tests were undertaken on the sixth floor of the full‐scale, seven storey, reinforced concrete building at the Large Building Test Facility of the Building Research Establishment at Cardington. By using internally strain gauged reinforcing bars cast into an internal and external floor bay during the construction process it was possible to gain a detailed record of slab strains resulting from the application of several arrangements of test loads. Short term tests were conducted in December 1998 and long term monitoring then ensued until April 2001. This paper describes the test programmes and presents results to indicate slab behaviour for the various loading regimes.     

Analysis of shrinkage deformations in concrete structures

An analytical method for predicting shrinkage deformations in both cracked and uncracked states is discussed. The validity of this method was verified by conducting an experimental investigation in which deformations due to shrinkage were measured for more than 300 days in the laboratory. The curvatures due to shrinkage were found to be different in cracked and uncracked states. The introduction of compression reinforcement was found to reduce the shrinkage curvatures, whereas increase in tension reinforcement was found to increase shrinkage curvatures. Equations presented here for computing these deformations compare fairly well with experimental data and are recommended to be used in the serviceability analysis of concrete members.     

Experimental study on z-pin bridging law by pullout test

This paper presents an experimental study on the evaluation of bridging law for a z-pin. The relationship between the z-pin bridging force and its displacement was measured by z-pin pullout tests. The tests were carried out using three types of samples with: single small pin; 3 × 3 small-pins (three columns × three rows) and 3 × 3 big-pins. For 3 × 3 small-pins samples, a typical pullout curve with initial bonding, debonding and frictional sliding was obtained. A high peak value of the debonding force was reached before z-pin debonding started. After debonding was initiated, the pullout force dropped rapidly to a lower value, the pins were then pulled out steadily against friction. However, for samples with 3 × 3 big-pins, it was difficult to discern the peak debonding force. The major results of this study are expected to provide a better physical understanding of the mechanics and mechanisms of z-pin bridging, aside from an efficient and accurate methodology to measure the crack-bridging law.     

本体纤维状结晶复合增强玻璃的研究

本文通过特殊的热处理工艺,在CaO-P₂O₅系统玻璃中结晶出定向的纤维。讨论了结晶化玻璃的微观结构和本体复合增强的机理。     

Developments in the measurement of reinforcement strain distributions in reinforced concrete members

A technique is described for measuring in detail the longitudinal strain distribution along the reinforcement of reinforced concrete members by means of strain gauges installed in a central duct within the reinforcement. Results of a preliminary test are given.     

Design of flat slabs for punching – European and North American practices

Punching is a critical design case for reinforced concrete flat slabs but the provisions for punching shear design and detailing of the shear reinforcement differ considerably among the various European and American design codes. Therefore the thickness of the slab or the amount or distribution of shear reinforcement may vary between different countries. The punching shear capacity of concrete, the punching shear resistance with shear reinforcement and the relevant detailing provisions of four European, two American codes and the CEB-FIP Model Code will be compared. The provisions have been compared by analysing flat slabs with typical dimensions and reinforcement ratios. The possibilities and limitations of each code and the consequences in practice will be demonstrated, using the flat slab of an office building as an example. With regard to practical aspects, the importance of shear reinforcement that can easily be installed will be emphasised.     

晶须补强复合材料机理的研究

介绍了晶须补强复合材料的机理,补强机理主要包括：负荷传递、拔出效应、界面解离;讨论了界面性质、晶须性能对机理的影响;并展望了今后的研究方向。