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磚混結(jié)構(gòu)加層抗震加固設(shè)計(jì)研究

發(fā)布時(shí)間:2018-11-25 11:28
【摘要】:磚混結(jié)構(gòu)是指建筑物中豎向承重結(jié)構(gòu)的墻、柱等采用磚或者砌塊砌筑,橫向承重的梁、樓板、屋面板等采用鋼筋混凝土結(jié)構(gòu)。磚混結(jié)構(gòu)在我國(guó)的五、六十年代可謂是風(fēng)靡一時(shí),很多住宅、辦公樓都設(shè)計(jì)成了磚混結(jié)構(gòu)。磚混結(jié)構(gòu)的加層設(shè)計(jì)多種多樣,輕鋼加層結(jié)構(gòu)由于質(zhì)量輕、強(qiáng)度高、對(duì)原結(jié)構(gòu)的地基影響小等諸多優(yōu)點(diǎn)而成為到加層結(jié)構(gòu)的首選。加層結(jié)構(gòu)下的磚混結(jié)構(gòu)加固設(shè)計(jì),是近年來國(guó)內(nèi)外學(xué)者共同關(guān)注的問題,它為結(jié)構(gòu)設(shè)計(jì)朝著更安全、更合理方向的發(fā)展提供了一種新的方法。 本文提出了房屋的加層設(shè)計(jì)應(yīng)與房屋的抗震加固相結(jié)合,結(jié)合工程實(shí)例分析了原結(jié)構(gòu)為磚混結(jié)構(gòu),上部采用輕鋼結(jié)構(gòu)加層時(shí),對(duì)原有下部結(jié)構(gòu)的加固處理方法和連接點(diǎn)構(gòu)造做法,主要研究工作包括以下幾個(gè)部分: (1)鋼結(jié)構(gòu)加層與原結(jié)構(gòu)的設(shè)計(jì)方法與連接的構(gòu)造措施:本文結(jié)合工程實(shí)例,針對(duì)當(dāng)下部為磚混結(jié)構(gòu),采用鋼結(jié)構(gòu)加層合理的結(jié)構(gòu)方案。同時(shí),為了增加加層后結(jié)構(gòu)的整體性,需要對(duì)鋼結(jié)構(gòu)加層與原結(jié)構(gòu)的連接節(jié)點(diǎn)進(jìn)行設(shè)計(jì),本文采用了在原結(jié)構(gòu)頂部增加反梁作為鋼結(jié)構(gòu)加層柱腳的基礎(chǔ)的方法,使加層結(jié)構(gòu)與原結(jié)構(gòu)可靠連接。 (2)結(jié)合具體的工程實(shí)例,對(duì)磚混結(jié)構(gòu)加層前,首先根據(jù)對(duì)原房屋鑒定報(bào)告的分析,以及現(xiàn)有磚混結(jié)構(gòu)房屋抗震加固方法的特點(diǎn)分析,然后再根據(jù)對(duì)原結(jié)構(gòu)加固的原則和要求,,開展對(duì)結(jié)構(gòu)進(jìn)行抗震加固方面的研究,比如采用雙面鋼筋網(wǎng)面層加固墻體、增設(shè)外加構(gòu)造柱、圈梁、對(duì)內(nèi)墻上部采用剛拉桿、頂層添加反梁的整體加固進(jìn)行設(shè)計(jì),在連接面上采用植筋技術(shù)及相關(guān)節(jié)點(diǎn)構(gòu)造措施,針對(duì)工程實(shí)例,建議對(duì)磚混結(jié)構(gòu)房屋抗震加固時(shí),外加構(gòu)造柱截面采用370mm×240mm,圈梁的高度為240mm,新增構(gòu)造柱及圈梁與原砌體采用Φ14以上的植筋鋼筋連接。得到對(duì)加層部分的可靠連接、增加構(gòu)造柱和圈梁、增設(shè)鋼拉桿可提高結(jié)構(gòu)的整體性及抗震能力。 (3)磚混結(jié)構(gòu)頂部鋼結(jié)構(gòu)加層的抗震性能分析:結(jié)合某磚混教學(xué)樓加層的工程實(shí)例,采用PKPM計(jì)算軟件對(duì)加固前后的磚混結(jié)構(gòu)房屋進(jìn)行驗(yàn)算并對(duì)比,通過對(duì)結(jié)構(gòu)加固前,加固后的計(jì)算對(duì)比得到預(yù)期的加固設(shè)計(jì)效果。
[Abstract]:Brick-concrete structure refers to the wall and column of vertical load-bearing structure in buildings, such as brick or block masonry, transverse load-bearing beam, floor slab, roof slab and so on, which adopt reinforced concrete structure. Brick-concrete structure is very popular in our country in 1950s and 1960s. Many residential and office buildings have been designed as brick-concrete structure. Because of the advantages of light weight, high strength and little influence on the foundation of the original structure, light steel layer structure is the first choice for the adding layer structure of brick-concrete structure, because of its many advantages, such as light weight, high strength, little influence on the foundation of original structure, and so on. The reinforcement design of brick-concrete structure under storied structure is a common concern of scholars at home and abroad in recent years. It provides a new method for the development of structural design towards a safer and more reasonable direction. In this paper, it is put forward that the design of adding storeys of buildings should be combined with the seismic strengthening of buildings. Combining with an engineering example, the author analyzes that the original structure is a brick-concrete structure and the upper part is a light steel structure. The main research work includes the following parts: (1) the design method of adding layer and original structure of steel structure and the construction measures of connection. When the lower part of the structure is brick-concrete structure, the reasonable structure scheme of adding layer to steel structure is adopted. At the same time, in order to increase the integrity of the structure after adding layers, it is necessary to design the connection joint between the steel structure and the original structure. In this paper, the method of adding inverse beam to the top of the original structure as the foundation of the steel structure with the column foot is adopted. Make the layer structure and the original structure reliable connection. (2) according to the analysis of the appraisal report of the original building and the characteristics of the existing seismic strengthening method of the brick and concrete structure, the concrete engineering example is used to analyze the masonry structure before adding the floor. Then, according to the principles and requirements of strengthening the original structure, the aseismic reinforcement of the structure is carried out, such as strengthening the wall with double-face reinforced steel mesh layer, adding additional structural columns, ring beams, and using rigid tension rods for the upper part of the inner wall. The whole reinforcement of the top floor with inverse beam is designed. The reinforcement technique and the related joint construction measures are adopted on the connection surface. In view of the engineering example, it is suggested that the 370mm 脳 240mm section of the additional structural column should be used in the seismic reinforcement of the brick and concrete structure building. The height of the ring beam is 240 mm, and the new structural column and ring beam are connected with the original masonry with steel bars above 桅 14. The structural integrity and seismic resistance of the structure can be improved by increasing the structural column and ring beam and adding the steel pull rod. (3) Seismic performance analysis of the top steel structure of brick and concrete structure: combined with the example of adding story in a brick and concrete teaching building, the PKPM calculation software is used to check and compare the masonry structure before and after strengthening. The design effect of reinforcement is expected by comparison of calculation results after reinforcement.
【學(xué)位授予單位】:河北工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:TU398.5;TU352.11

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