【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)補強、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、預應力達不到原來的基本受力要求，疲勞破壞�，F(xiàn)在運用增大截面法進行加固維修，成為一種主潮流，市場前景非常廣闊。植筋技術也廣泛運用在混凝土結(jié)構(gòu)的加固維修中，無植筋技術素混凝土的計算方法，理論理念已相當成熟。但植筋后的混凝土結(jié)合面剪力的計算方法，在加載中，受力分析過程、受力機理、計算方法國內(nèi)外研究的非常少。本文通過實驗，收集實驗數(shù)據(jù)，測出新舊混凝土結(jié)合面的剪力影響系數(shù)，詳細論述了粘結(jié)機理，修正公式參數(shù)。 首先，本文設計并制作了12組36個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/C50三個等級的混凝土，配合比也是選用實際工程中最普遍的，鋼筋選用Φ12的螺紋鋼筋，實驗考慮植入鋼筋面積，鋼筋的分布規(guī)律，混凝土的強度等級等可控因素對新舊混凝土結(jié)合面剪切強度的影響。 其次，通過素混凝土Z形構(gòu)件的實驗數(shù)據(jù)，推導出了素混凝土純剪切構(gòu)件的結(jié)合面的剪切強度系數(shù)，并和以往推導的系數(shù)相互比較分析，從側(cè)面證實了本次實驗的可靠性、科學性，為下文粘結(jié)機理的提出，以及理論公式的推導提供科學依據(jù)。 第三，根據(jù)本次實驗，得到的實驗數(shù)據(jù)，總結(jié)的實驗規(guī)律，以增大截面法進行加固素混凝土的五區(qū)三粘基本理論模型的基礎上，，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，增大截面法進行加固，本文通過粘結(jié)機理，以實驗現(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破壞過程，并在不同受力階段提出了剪切強度的計算公式，為以后加固維修計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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.72;U445.57

【參考文獻】

相關期刊論文 前8條

1 王學軍;基礎沉降對加寬橋梁上部構(gòu)造的影響分析[J];河北工業(yè)大學成人教育學院學報;2002年02期

2 余�？�;高速公路拓寬工程梁板縱向拼接縫的處理[J];公路;2003年06期

3 馬春生,宋神友;廣佛高速公路湖洲大橋主橋新舊結(jié)構(gòu)連接設計[J];公路;2003年S1期

4 張麗芳;郭濤;吳文清;葉見曙;;舊橋拓寬中拼接方式對舊橋受力狀態(tài)的影響分析[J];公路交通科技;2006年02期

5 鞠金熒;;滬寧高速公路(江蘇段)擴建工程橋梁拼接設計構(gòu)思[J];中外公路;2006年06期

6 錢江;艾軍;張麗芳;;不同拓寬連接方式對舊橋受力狀態(tài)的影響分析[J];交通與計算機;2008年03期

7 吳云,李曉宏;滬寧高速擴建工程橋梁拼接施工[J];現(xiàn)代交通技術;2005年01期

8 孟廣文;淺談公路舊橋拓寬上部結(jié)構(gòu)聯(lián)結(jié)形式及其影響[J];交通世界;2004年05期

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