【摘要】：混凝土加固的粘結(jié)問題目前已廣泛存在于既有混凝土結(jié)構(gòu)補(bǔ)強(qiáng)、維修加固及新建混凝土工程中�；炷两Y(jié)構(gòu)現(xiàn)在存在非常多的問題:老化、鋼筋銹蝕、預(yù)應(yīng)力達(dá)不到原來的基本受力要求，疲勞破壞�，F(xiàn)在運(yùn)用增大截面法進(jìn)行加固維修，成為一種主潮流，市場前景非常廣闊。植筋技術(shù)也廣泛運(yùn)用在混凝土結(jié)構(gòu)的加固維修中，無植筋技術(shù)素混凝土的計(jì)算方法，理論理念已相當(dāng)成熟。但植筋后的混凝土結(jié)合面剪力的計(jì)算方法，在加載中，受力分析過程、受力機(jī)理、計(jì)算方法國內(nèi)外研究的非常少。本文通過實(shí)驗(yàn)，收集實(shí)驗(yàn)數(shù)據(jù)，測出新舊混凝土結(jié)合面的剪力影響系數(shù)，詳細(xì)論述了粘結(jié)機(jī)理，修正公式參數(shù)。 首先，本文設(shè)計(jì)并制作了12組36個(gè)Z型構(gòu)件，混凝土等級考慮了現(xiàn)在施工過程中最常用的C30/C40/C50三個(gè)等級的混凝土，配合比也是選用實(shí)際工程中最普遍的，鋼筋選用Φ12的螺紋鋼筋，實(shí)驗(yàn)考慮植入鋼筋面積，鋼筋的分布規(guī)律，混凝土的強(qiáng)度等級等可控因素對新舊混凝土結(jié)合面剪切強(qiáng)度的影響。 其次，通過素混凝土Z形構(gòu)件的實(shí)驗(yàn)數(shù)據(jù)，推導(dǎo)出了素混凝土純剪切構(gòu)件的結(jié)合面的剪切強(qiáng)度系數(shù)，并和以往推導(dǎo)的系數(shù)相互比較分析，從側(cè)面證實(shí)了本次實(shí)驗(yàn)的可靠性、科學(xué)性，為下文粘結(jié)機(jī)理的提出，以及理論公式的推導(dǎo)提供科學(xué)依據(jù)。 第三，根據(jù)本次實(shí)驗(yàn)，得到的實(shí)驗(yàn)數(shù)據(jù)，總結(jié)的實(shí)驗(yàn)規(guī)律，以增大截面法進(jìn)行加固素混凝土的五區(qū)三粘基本理論模型的基礎(chǔ)上，，提出了植入剪力筋后新舊混凝土結(jié)合面的五區(qū)三粘理論模型。 第四，增大截面法進(jìn)行加固，本文通過粘結(jié)機(jī)理，以實(shí)驗(yàn)現(xiàn)象為根據(jù)，清晰的論述了新舊混凝土植入鋼筋后在加載過程中的整個(gè)破壞過程，并在不同受力階段提出了剪切強(qiáng)度的計(jì)算公式，為以后加固維修計(jì)算分析提供了理論依據(jù)。
[Abstract]:At present, the bond problem of concrete reinforcement has been widely used in existing concrete structure reinforcement, maintenance and reinforcement and new concrete projects. There are many problems in concrete structure: aging, steel bar corrosion, prestress can not meet the original basic stress requirements, fatigue damage. Now it is a main trend to use the method of increasing section to reinforce and maintain, and the market prospect is very broad. Reinforcement technology is also widely used in the reinforcement and maintenance of concrete structures. The calculation method of plain concrete without planting tendons has been quite mature in theory. However, the calculation method of shear force of concrete joint surface after planting reinforcement is very few in the process of force analysis, stress mechanism and calculation method at home and abroad. In this paper, the influence coefficient of shear force on the new and old concrete bonding surface is measured by collecting the experimental data, and the bonding mechanism and the correction formula parameters are discussed in detail. First of all, this paper designs and makes 12 groups of 36 Z-type members. The concrete grade takes into account the three grades of C30/C40/C50, which are the most commonly used in the construction process. The mix ratio is also the most common in the actual engineering, and the reinforcement is made with the rebar of 桅 12. The effect of controllable factors, such as the area of reinforced bars, the distribution of steel bars and the strength grade of concrete, on the shear strength of new and old concrete joints is considered in the experiment. Secondly, based on the experimental data of plain concrete Z-shaped members, the shear strength coefficients of plain concrete pure shear members are derived, and compared with the previous ones, the reliability of this experiment is confirmed. It provides scientific basis for the mechanism of bond and the derivation of theoretical formula. Thirdly, according to the experimental data and the experimental rules, the basic theory model of strengthening plain concrete with five zones and three viscosities is carried out by the method of increasing section. This paper presents a five-zone three-viscosity model for the new and old concrete joints after the shear tendons are implanted. Fourthly, the method of increasing section is used to reinforce the concrete. Based on the mechanism of bond and the experimental phenomenon, the whole failure process of new and old concrete is clearly discussed in the course of loading. The formula of shear strength is put forward in different stress stages, which provides a theoretical basis for the calculation and analysis of reinforcement and maintenance in the future.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72;U445.57

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