本文關(guān)鍵詞： 料石砌體 抗壓承載力 抗剪承載力 破壞形態(tài) 力學(xué)分析 有限元分析　出處：《東南大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在我國(guó)東南沿海地區(qū),料石砌體依然應(yīng)用廣泛。但是現(xiàn)有的料石砌體結(jié)構(gòu)存在嚴(yán)重的安全隱患。針對(duì)該地區(qū)料石砌體結(jié)構(gòu)的特點(diǎn),本文開(kāi)展了料石砌體抗壓承載力和抗剪承載力試驗(yàn),并結(jié)合力學(xué)分析和有限元分析,三者相互對(duì)比、相互印證,為料石砌體結(jié)構(gòu)的應(yīng)用提供了依據(jù)。本文通過(guò)7組(共21個(gè))試件的抗壓試驗(yàn),研究了料石砌體在豎向荷載作用下的破壞過(guò)程及砂漿強(qiáng)度、灰縫厚度對(duì)料石砌體抗壓承載力的影響。試驗(yàn)結(jié)果表明：其破壞過(guò)程主要分為三個(gè)階段,彈性階段、裂縫開(kāi)展階段和破壞階段,為脆性破壞,粗料石砌體的脆性破壞更加明顯；其抗壓承載力很高,隨著砂漿強(qiáng)度的提高而提高,隨著灰縫厚度的增加而降低,細(xì)料石砌體抗壓承載力的離散性小于粗料石砌體。通過(guò)力學(xué)分析得：因料石和砂漿材料性能的差異,在豎向荷載作用下,料石水平向受拉、砂漿水平向受壓,它們的水平向應(yīng)力主要受砂漿強(qiáng)度、料石和砂漿厚度比的影響。在此基礎(chǔ)上提出了粗細(xì)料石統(tǒng)一的抗壓承載力計(jì)算公式,綜合考慮了砂漿強(qiáng)度、料石強(qiáng)度、料石和砂漿厚度比的影響,較真實(shí)地反映了料石砌體抗壓承載力與砂漿水平向應(yīng)力的關(guān)系,可供規(guī)范修訂參考。通過(guò)有限元分析得到了料石砌體在豎向荷載作用下的應(yīng)力云圖,在豎向灰縫與上下兩皮料石的連接處,存在應(yīng)力集中現(xiàn)象,與試驗(yàn)過(guò)程中試件該部位首先開(kāi)裂相吻合：料石和砂漿的水平力大小、方向及其影響因素,與力學(xué)分析得到的結(jié)果基本一致。本文開(kāi)展了6組(共18個(gè))試件的抗剪試驗(yàn),利用液壓伺服系統(tǒng)(MTS)加載,直接得到了粘結(jié)強(qiáng)度和摩擦強(qiáng)度。試驗(yàn)結(jié)果表明：當(dāng)試件發(fā)生剪摩破壞時(shí),其破壞過(guò)程主要分為三個(gè)階段,彈性階段,粘結(jié)力消失階段和摩擦耗能階段；其粘結(jié)強(qiáng)度隨著砂漿強(qiáng)度的提高而提高,摩擦強(qiáng)度隨著豎向壓應(yīng)力的提高而提高。充分考慮它們離散性的差異,本文提出了抗剪強(qiáng)度標(biāo)準(zhǔn)值和設(shè)計(jì)值的計(jì)算公式。結(jié)合試驗(yàn)結(jié)果、力學(xué)分析和有限元分析得到：隨著軸壓比的增大,料石砌體的破壞部位依次為料石和砂漿的粘結(jié)面、砂漿、料石,其破壞形態(tài)依次為剪摩破壞、剪壓破壞和斜壓破壞。通過(guò)力學(xué)分析得到了在剪壓復(fù)合作用下,料石和砂漿的三個(gè)主應(yīng)力大小和方向,并分析其變化。在此基礎(chǔ)上提出了一種新的剪壓相關(guān)曲線理論：變粘結(jié)強(qiáng)度法,使得該曲線在剪摩破壞和剪壓破壞交點(diǎn)處光滑,用數(shù)學(xué)方法證明了其正確性。通過(guò)有限元分析得到了在不同軸壓比下砂漿和料石各自的應(yīng)力云圖,與力學(xué)分析相對(duì)比,相互驗(yàn)證了其合理性。
[Abstract]:In southeast coastal areas of China, stone masonry is still widely used. However, the existing masonry structure has serious safety risks. In view of the characteristics of the masonry structure in this area. In this paper, the compressive bearing capacity and shear bearing capacity of stone masonry are tested, and combined with mechanical analysis and finite element analysis, the three are compared with each other to verify each other. In this paper, the failure process and mortar strength of stone masonry under vertical load are studied through compressive tests of 7 groups (21 specimens). The test results show that the failure process is divided into three stages, elastic stage, crack development stage and failure stage, which is brittle failure. The brittleness failure of coarse stone masonry is more obvious. Its compressive capacity is very high, which increases with the increase of mortar strength and decreases with the increase of ash seam thickness. The discreteness of compressive bearing capacity of fine stone masonry is smaller than that of coarse stone masonry. Through mechanical analysis, it is concluded that under vertical load, stone is pulled horizontally and mortar is compressed horizontally because of the difference of material properties between stone and mortar. Their horizontal stresses are mainly affected by mortar strength, the ratio of aggregate to mortar thickness. On this basis, a unified formula for calculating the compressive capacity of coarse and fine materials is proposed, which considers the strength of mortar and the strength of aggregate and stone. The effect of the thickness ratio of aggregate to mortar reflects the relationship between the compressive capacity of masonry and the horizontal stress of mortar. Through the finite element analysis, the stress cloud diagram of stone masonry under vertical load is obtained. The stress concentration phenomenon exists in the joint of vertical gray joint and upper and lower leather stone. It is consistent with the first crack of the specimen during the test: the horizontal force, direction and influencing factors of the aggregate and mortar. In this paper, the shear tests of 6 groups (18 groups) of specimens are carried out and loaded with hydraulic servo system (MTS). The bond strength and friction strength are obtained directly. The experimental results show that the failure process is divided into three stages: elastic stage, adhesive disappearance stage and friction energy dissipation stage when the specimen is subjected to shear and friction failure. The bond strength increases with the increase of mortar strength, and the friction strength increases with the increase of vertical compressive stress. In this paper, the calculation formulas of the standard value and design value of shear strength are put forward. Combined with the test results, the mechanical analysis and finite element analysis show that: with the increase of axial compression ratio. The failure position of masonry is the bond surface of aggregate and mortar, mortar and aggregate in turn, and the failure modes are shear friction failure, shear compression failure and baroclinic failure in turn. Through mechanical analysis, the composite action of shear and compression is obtained. On the basis of the analysis of the three principal stresses and directions of aggregate and mortar, a new theory of shear compression curve is proposed: variable bond strength method. The curve is smooth at the intersection of shear failure and shear-compression failure, which is proved to be correct by mathematical method. The stress cloud diagram of mortar and stone under different axial compression ratio is obtained by finite element analysis. Compared with the mechanical analysis, the rationality of the method is verified.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU522.3

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