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    蘇州混凝土水泥制品研究院有限公司

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    節能與環保

    基于ANSYS的薄壁墩受力性能分析及參數優化研究
    基于ANSYS的薄壁墩受力性能分析及參數優化研究
    • 唐先習,張景偉,孫拴虎,何 勇
    2019年第1期
    摘要
    引用本文
    摘 要:在高速公路剛構橋墩臺設計與施工中,箱型薄壁墩與雙薄壁墩因其施工簡便,經濟實用等特點而被廣泛采用。本文基于ANSYS有限元軟件分別對這兩種結構形式進行了建模分析,以期通過對比他們的力學性能來優化設計方案,選取合理的設計參數,進一步指導施工。通過分析對比在荷載作用下最不利截面上應力和位移的變化情況,總結出同一形式薄壁墩在同一截面與不同截面下應力的變化規律,以及不同橫截面積情況下橋墩頂端位移的變化規律。在考慮兩種形式的薄壁墩受力性能的的基礎上,給出了優化箱型薄壁墩薄壁厚度的選取范圍,并針對雙薄壁墩提出增加橫向連接的建議。 Abstract: During the construction of rigid frame piers of expressways, box thin-walled piers and double thin-walled piers are widely used because of their lots of characteristic, such as simple construction, economy, practicality and so on. ANSYS finite element software is used to model and analyze the two types of structures, in order to optimize the design scheme by comparing their mechanical properties, and select reasonable design parameters, and guide the construction. By analyzing and comparing the changes of stress and displacement on the most dangerous cross-section under the load, the law of stress variation of the same type of thin-walled pier under the same cross-section and different cross-section are summarized. On the basis of considering the mechanical properties of two types of thin-walled piers, the thin-walled thickness of box thin-walled piers is given, and suggestions for adding the lateral connection of double thin-walled piers are put forward.
    唐先習,張景偉,孫拴虎,等.基于ANSYS的薄壁墩受力性能分析及參數優化研究[J].混凝土與水泥制品,2019(1):85-90. TANG X X,ZHANG J W,SUN S H,et al.Analysis of Mechanical Performance and Parameter Optimization of Thin-walled Pier Based on ANSYS[J].China Concrete and Cement Products,2019(1):85-90.
    顆粒整形對石屑性能改善的試驗研究
    顆粒整形對石屑性能改善的試驗研究
    • 譚世霖,蔣雪琴,楊醫博,周啟源
    2019年第1期
    摘要
    引用本文
    摘 要:石場在不同的加工機械與工藝條件下得到的石屑性能差別較大,導致可在混凝土中利用的石屑數量非常有限。為了增加石屑的可利用性能,進行了石屑顆粒整形的研究。研究結果表明,對石屑進行顆粒整形,能夠將不滿足建設用砂要求的石屑,加工成除石粉含量略高外,其它性能均滿足建設用砂要求的整形石屑。 Abstract: The properties of stone chips obtained by quarries under different processing machinery and technology conditions are quite different, which leads to the very limited number of stone chips available in concrete. In order to increase the utilization performance of stone chips, a study on the shaping of stone chips was carried out. The research results show that the granular shaping of stone chips can process the shaping stone chips which can not meet the requirements of construction sand into shaping stone chips whose properties meet the requirements of construction sand except for the slightly higher content of stone powder.
    譚世霖,蔣雪琴,楊醫博,等.顆粒整形對石屑性能改善的試驗研究[J].混凝土與水泥制品,2019(1):91-94+100. TAN S L,JIANG X Q,YANG Y B,et al.Experimental Research of Particle Shaping on Performance Improvement of Stone Chips[J].China Concrete and Cement Products,2019(1):91-94+100.
    粉煤灰改性透水再生混凝土力學性能試驗研究
    粉煤灰改性透水再生混凝土力學性能試驗研究
    • 張衛東,王振波
    2019年第1期
    摘要
    引用本文
    摘 要:通過改變粉煤灰取代率及超摻系數,研究了粉煤灰對不同水灰比及再生混凝土粗骨料取代率透水再生混凝土力學性能的影響。結果表明,粉煤灰等量取代水泥的透水再生混凝土立方體抗壓強度、抗折強度及折壓比均低于基準透水再生混凝土;當粉煤灰超量取代水泥時,粉煤灰取代率低于20%時的立方體抗壓強度、抗折強度及折壓比均隨超量系數增加而增大,但超量系數超過1.4后效果不明顯;粉煤灰取代率為30%時,不同粉煤灰超量系數下力學性能均低于基準試驗值;隨著再生混凝土粗骨料取代率或水灰比的增大,立方體抗壓強度、抗折強度及折壓比均隨之下降,相同水灰比或再生混凝土粗骨料取代率時,立方體抗壓強度、抗折強度及折壓比均隨粉煤灰超量系數增大而增大,但超量系數超過1.4后效果同樣不明顯。 Abstract: Through changing the replacement ratio and excessive incorporation coefficient of fly ash, the effect of fly ash on the mechanical properties of the pervious recycled concrete with different W/C and the replacement ratio of recycled aggregate is studied, and the optimal replacement ratio of fly ash and excess incorporation coefficient are determined. The results show that the cubic compressive strength, flexural strength, and the ratio of flexural strength to compressive strength of pervious recycled concrete with equal amounts of fly ash to replace cement are all lower than those of normal pervious recycled concrete; when the fly ash corctent is over and the replacement ratio of fly ash is lower than 20%, the cubic compressive strength, flexural strength and the ratio of flexural strength to compressive strength increase with the increase of the excessive incorporation coefficient, but the effect is not obvious after the excessive incorporation coefficient exceeds 1.4; When the replacement ratio of fly ash is 30%, the mechanical properties of different fly ash exceesive incorporation coefficients are lower than the benchmark value, so it is recommended that the replacement ratio of fly ash should not exceed 20%. With the increase of the replacement ratio of recycled concrete aggregates or the W/C, the cubic compressive strength, flexural strength and the ratio of flexural strength to compressive strength all decrease. Under the same W/C or the replacement ratio of recycled concrete aggregates, the cubic compressive strength, flexural strength, and the ratio of flexural strength to compressive strength all increase with the increase of the fly ash excessive incorporation coefficient, but the effect is not also obvious after the excessive incorporation coefficient exceeds 1.4.
    張衛東,王振波.粉煤灰改性透水再生混凝土力學性能試驗研究[J].混凝土與水泥制品,2019(1):95-100. ZHANG W D,WANG Z B.Experimental Study on Mechanical Properties of Pervious Recycled Concrete Modified by Fly Ash[J].China Concrete and Cement Products,2019(1):95-100.
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