裂縫對(duì)簡(jiǎn)支梁結(jié)構(gòu)靜力特性影響研究
本文選題:裂縫 + 簡(jiǎn)支梁。 參考:《重慶交通大學(xué)》2014年碩士論文
【摘要】:本文首先概括了橋梁裂縫分類并對(duì)引起裂縫的原因進(jìn)行了分析,然后對(duì)4片有機(jī)玻璃簡(jiǎn)支T梁和一片鋼筋混凝土簡(jiǎn)支矩形梁進(jìn)行了室內(nèi)模型試驗(yàn)并與ANSYS有限元模型的計(jì)算結(jié)果進(jìn)行了對(duì)比,重點(diǎn)關(guān)注裂縫對(duì)簡(jiǎn)支梁底應(yīng)變的影響;在模型試驗(yàn)的基礎(chǔ)上,,對(duì)橋梁工程中常用的中小跨簡(jiǎn)支梁進(jìn)行了數(shù)值模擬,以此研究裂縫對(duì)簡(jiǎn)支梁靜力特性的影響;最后通過(guò)實(shí)例工程對(duì)含裂縫結(jié)構(gòu)進(jìn)行了分析和研究,并得到了如下結(jié)論: ①在有限元軟件ANSYS中采用分離式裂縫模型對(duì)簡(jiǎn)支梁裂縫進(jìn)行模擬是合理可行的,能準(zhǔn)確的描述其靜力特性; ②在集中荷載作用下,主梁結(jié)構(gòu)上已有的裂縫附近區(qū)域存在很大的應(yīng)變梯度,應(yīng)變?cè)诹芽p位置接近為0,離開裂縫位置應(yīng)變迅速增大到無(wú)裂縫時(shí)的正常應(yīng)變值; ③理想情況下,裂縫對(duì)應(yīng)變影響區(qū)域的大小與所施加靜力荷載的大小無(wú)關(guān); ④簡(jiǎn)支梁在出現(xiàn)裂縫前后的撓度差值不能作為裂縫位置定位的一個(gè)有效參數(shù); ⑤理想情況下,對(duì)于截面形式相同,梁跨徑不同的簡(jiǎn)支T梁,裂縫對(duì)應(yīng)變影響區(qū)域的大小與梁跨徑的大小無(wú)關(guān); ⑥簡(jiǎn)支空心板梁縱向裂縫對(duì)沿梁跨徑方向上的應(yīng)變值影響很小,可以忽略不計(jì); ⑦簡(jiǎn)支空心板梁跨中橫向應(yīng)變值的大小與沿跨徑方向上的縱向裂縫長(zhǎng)度無(wú)關(guān),只與裂縫深度有關(guān)。
[Abstract]:This paper first summarizes the classification of bridge cracks and analyzes the causes of the cracks. Then, four polyglass-supported T-beams and a reinforced concrete simply supported rectangular beam are tested in laboratory and compared with the results of ANSYS finite element model, focusing on the effect of cracks on the bottom strain of simply supported beams. On the basis of model test, numerical simulation is carried out to study the influence of cracks on static characteristics of simply supported beams with small and medium span, which is commonly used in bridge engineering. The conclusions are as follows: 1 in the finite element software ANSYS, it is reasonable and feasible to use the split crack model to simulate the crack of simply supported beam, and can accurately describe its static characteristics; (2) under concentrated load, there exists a large strain gradient in the area near the cracks in the main beam structure, where the strain is close to zero, and the strain increases rapidly from the crack position to the normal strain value without crack; (3) under ideal conditions, the size of the area affected by the crack strain is independent of the size of the static load applied; (4) the deflection difference of simply supported beam before and after crack can not be regarded as an effective parameter of crack location; (5) under ideal conditions, for simply supported T-beams with the same cross section and different spans, the size of the area affected by the crack strain is independent of the size of the beam span; (6) the longitudinal crack of simply supported hollow slab beam has little effect on the strain value along the span direction of the beam, which can be ignored; (7) the magnitude of transverse strain in the span of simply supported hollow slab beam is independent of the longitudinal crack length along the span direction, but only related to the crack depth.
【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)】:U441
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