本文選題：重組竹　切入點：力學(xué)性能　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：針對我國豐富的竹材資源，根據(jù)可持續(xù)發(fā)展，節(jié)能低碳的原則，，結(jié)合橋梁和建筑領(lǐng)域的需求，通過突破強度、剛度、耐久性以及設(shè)計和連接等關(guān)鍵技術(shù)難題，設(shè)計大跨度的竹質(zhì)工程構(gòu)件，進行橋梁和房屋的建造，滿足社會需要。重組竹材借鑒重組木的制造工藝和原理，是竹材利用上的一個全新起點，重組竹材具有良好的物理力學(xué)特性，但是目前將重組竹材運用于一些承重結(jié)構(gòu)中依然較少見，對竹材主要研究和開發(fā)內(nèi)容主要有：一、耐候性高強竹質(zhì)工程材料加工技術(shù)；二、大跨度建筑竹質(zhì)工程構(gòu)件設(shè)計與制造技術(shù)；三、竹質(zhì)工程材料天然耐腐和防護技術(shù)；四、竹質(zhì)結(jié)構(gòu)房屋設(shè)計、建造示范與安全健康性能評價技術(shù)；五、竹質(zhì)工程材料小橋結(jié)構(gòu)設(shè)計。 竹質(zhì)橋梁連接構(gòu)造方式是建造竹質(zhì)橋梁的基礎(chǔ)，通過了解現(xiàn)有鋼結(jié)構(gòu)和木結(jié)構(gòu)的相關(guān)連接構(gòu)造形式，提出適用于竹質(zhì)結(jié)構(gòu)的三種鋼構(gòu)件—螺栓連接構(gòu)造方式,列舉了簡支結(jié)構(gòu)、桁架結(jié)構(gòu)、拱式結(jié)構(gòu)中構(gòu)件的連接，并設(shè)計出5種型式竹質(zhì)材料人行橋。并對材料進行了順紋力學(xué)性能實驗，最后采用有限元軟件對連接構(gòu)造設(shè)計參數(shù)取值進行了計算，分析了連接構(gòu)造的力學(xué)行為及連接構(gòu)件的破壞形式，主要研究結(jié)果歸納如下： （1）膠合重組竹材具有較好的力學(xué)性能，得到膠縫的抗剪強度大于膠合竹材的抗剪強度，滿足規(guī)范要求；在對膠合竹材進行抗拉和抗彎實驗中，抗拉試件形狀（1）及抗彎試件的第二種加載形式，其受力性能更好； （2）根據(jù)螺栓順紋受力破壞計算條件，得到竹材對稱連接中中部和邊部構(gòu)件最小厚度及螺栓端距和中距的最小值，對橫向螺栓間距參考木結(jié)構(gòu)設(shè)計取值。模型計算中螺栓順紋最小端距取值滿足抗剪強度設(shè)計值的要求，與理論計算相符； （3）在竹材構(gòu)件的抗拉接頭中采用外鋼夾板連接較為合適、在抗彎接頭中采用槽型鋼夾板連接較為合適； （4）竹材與竹材連接中改變側(cè)材與主材的相對厚度及螺栓直徑，當(dāng)螺栓直徑較大，其破壞形式為中部或邊部構(gòu)件的承壓破壞；當(dāng)螺栓直徑較小時，其破壞形式為螺栓彎曲出現(xiàn)塑性鉸而達(dá)到連接節(jié)點的最大承載力。竹材與竹材連接中破壞模式Ⅱ為螺栓彎曲和螺孔的承壓破壞，能夠充分發(fā)揮兩種材料的性能。
[Abstract]:For the rich bamboo resources in China, according to sustainable development, low carbon energy principle, combined with the bridge and building areas, breaking through strength, stiffness, durability and key technology of design and connection problems such as bamboo engineering component design of long-span bridge, construction and housing, to meet the needs of the community the recombinant bamboo scrimber and manufacturing process from the principle, is a new starting point of bamboo utilization, has good physical and mechanical properties of Reconstituted Bamboo, but the reconstituted bamboo used in some of the load-bearing structure is still relatively rare at present, there are mainly on the main content: the research and development of bamboo, bamboo engineering of high strength weathering resistance material processing technology; two, the construction of large span bamboo engineering component design and manufacturing technology; three, bamboo engineering materials of natural corrosion and protection technology; four, the bamboo structure building design, construction and demonstration Safety and health performance evaluation technology; five, the design of small bridge structure for bamboo engineering materials.
The bamboo bridge structure is built of bamboo bridge, through the understanding of the relevant connection structure of existing steel structure and wood structure, which is suitable for bamboo structure of three kinds of steel - bolt connection structure, are simple structure, truss structure, arch junction structure components, and design 5 types of bamboo material footbridge. And the materials were along the lines of experimental mechanical properties, use the finite element software for connecting structure design parameters were calculated and analyzed the mechanical behavior of the connection structure and damage form of connection components, the main results are as follows:
(1) recombinant bamboo material has good mechanical properties, obtained shear strength shear strength is greater than the glue laminated bamboo, meet the standard requirements; on glubam of tensile and bending experiments, tensile specimen shape (1) and bending test of second kinds of loading parts, its stress better performance;
(2) according to the longitudinal stress bolt failure calculation conditions, get the symmetric central and edge components of bamboo and the minimum thickness of the bolt connection end distance and the distance of the minimum value, the transverse bolt spacing reference design value of wooden structure. The model calculation of bolt end distance can satisfy the minimum longitudinal shear strength design value requirements in accordance with the theoretical calculation;
(3) it is more appropriate to use the external steel splint to connect the tensile joints of bamboo members, and it is more suitable to use the slot type steel splint in the bending joint.
(4) the bamboo and bamboo in the connection to change the relative thickness and diameter of the bolt material and the material side, when the bolt diameter is larger, the failure form of damage to bearing middle or on the edge of the component; when the bolt diameter is small, the damage in the form of bolt bending plastic hinge and the maximum bearing capacity of joint bearing. Bamboo and bamboo in the connection failure mode II and screw bolt bending failure, can give full play to the performance of the two materials.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U448.31

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