本文選題：鋼管與上部結(jié)構(gòu)連接 + 剪力鍵　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：鋼管樁以自身抗拉、抗壓強(qiáng)度高，抗彎、抗剪能力強(qiáng)等優(yōu)勢在港工工程結(jié)構(gòu)中得到了廣泛、迅速的應(yīng)用。然而，鋼管與上部結(jié)構(gòu)的連接部分一直關(guān)系著整個(gè)結(jié)構(gòu)的安全與穩(wěn)定，也是結(jié)構(gòu)正常使用的基礎(chǔ)。鋼管樁與上部結(jié)構(gòu)的連接方式中一種形式就是采用剪力鍵連接，剪力鍵的連接方式國內(nèi)外相關(guān)規(guī)范尚無明確規(guī)定，也沒有完整的計(jì)算理論。因此，關(guān)于鋼管樁與上部結(jié)構(gòu)剪力鍵連接的設(shè)計(jì)方法研究，具有重要的意義。 本文探討了剪力鍵連接方式的破壞模式,分析總結(jié)了其破壞機(jī)理。在研究鋼管受力過程中，以廣義胡克定律為基礎(chǔ)，基于一定假設(shè)條件推導(dǎo)了核心混凝土在軸力作用下軸向應(yīng)力與環(huán)向應(yīng)力的關(guān)系表達(dá)式，得到混凝土作用在鋼管上的徑向力。將彈性地基梁比擬法應(yīng)用到解決鋼管問題上，把鋼管看作彈性地基上的梁，選用SAP2000有限元分析軟件對鋼管不同受力模式進(jìn)行數(shù)值模擬。通過施加不同軸向力，得到不同荷載作用下鋼管剪力鍵處的環(huán)向應(yīng)變的數(shù)值模擬結(jié)果，與實(shí)驗(yàn)實(shí)測應(yīng)變值相比較，驗(yàn)證軸力作用下鋼管近似分析方法的有效性。結(jié)果顯示：鋼管近似分析方法得到的結(jié)果與實(shí)驗(yàn)實(shí)測結(jié)果比較接近且具有相同的變化規(guī)律，，并發(fā)現(xiàn)鋼管在剪力鍵處環(huán)向應(yīng)變值最大。鋼管在軸力作用下的近似計(jì)算方法可用來計(jì)算剪力鍵連接處鋼管的受力、位移、應(yīng)力、應(yīng)變，為剪力鍵連接的鋼管承載力計(jì)算及設(shè)計(jì)方法提供參考。 本文運(yùn)用軸力作用下鋼管近似分析方法來研究連接處設(shè)置多個(gè)剪力鍵的受力特性，將總軸力按不同比例分配到各個(gè)剪力鍵來承擔(dān)，研究發(fā)現(xiàn)：更靠近端部的剪力鍵承擔(dān)的軸力超過總軸力的一半，且隨著軸力的增大所占軸力的比值也越來越大；剪力鍵間距越小，更靠近樁頂?shù)募袅︽I所承擔(dān)的軸力占總軸力的比越大。剪力鍵連接處的應(yīng)力集中不容忽視，本文在研究中發(fā)現(xiàn)剪力鍵與鋼管在焊接連接處，應(yīng)力集中系數(shù)約為1.9~2.1。 本文提出的軸力作用下鋼管近似分析方法，以及此方法在研究剪力鍵連接相關(guān)問題中的應(yīng)用都將為剪力鍵連接的設(shè)計(jì)方法提供參考。
[Abstract]:The steel pipe pile has been widely and rapidly applied in the structure of port engineering because of its advantages of high tensile strength, high compressive strength, bending resistance and strong shear capacity. However, the connection part between steel pipe and superstructure is always related to the safety and stability of the whole structure, and is also the basis of the normal use of the structure. One form of connection between steel pipe pile and superstructure is to adopt shear bond connection. The connection mode of shear bond has not been clearly stipulated in the relevant codes at home and abroad and there is no complete calculation theory. Therefore, it is of great significance to study the design method of shear bond connection between steel pipe pile and superstructure. In this paper, the failure mode of shear bond connection is discussed, and its failure mechanism is analyzed and summarized. On the basis of generalized Hook's law and some assumptions, the expression of the relationship between the axial stress and the circumferential stress of the core concrete under the axial force is derived, and the radial force of the concrete acting on the steel tube is obtained. The elastic foundation beam analogy method is applied to solve the steel pipe problem. The steel pipe is regarded as the beam on the elastic foundation. The SAP2000 finite element analysis software is used to simulate the different stress modes of the steel pipe. By applying different axial forces, the numerical simulation results of the circumferential strain at the shear bond of the steel tube under different loads are obtained, and the validity of the approximate analysis method for the steel tube under the axial force is verified by comparing with the experimental measured strain value. The results show that the results obtained by the approximate analysis method are close to the experimental results and have the same variation law. It is also found that the circumferential strain value of the steel pipe is the largest at the shear bond. The approximate calculation method of steel pipe under axial force can be used to calculate the stress, displacement, stress and strain of the steel pipe at the connection of shear key, which provides a reference for the calculation and design of the bearing capacity of the steel pipe connected by the shear bond. In this paper, the approximate analysis method of steel pipe under axial force is used to study the mechanical characteristics of multiple shear keys set at the joint, and the total axial force is distributed to each shear bond according to different proportions. It is found that the axial force of the shear bond closer to the end is more than half of the total axial force, and the ratio of the axial force to the axial force increases with the increase of the axial force. The ratio of the axial force to the total axial force is larger by the shear bond closer to the top of the pile. The stress concentration at the joint of shear bond can not be ignored. In this paper, it is found that the stress concentration factor between shear bond and steel pipe is about 1.9 ~ 2.1. In this paper, the approximate analysis method of steel pipe under axial force and its application in the study of the problems related to the connection of shear bond will provide a reference for the design method of the connection of shear bond.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U655.5

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