本文選題：樁承臺(tái)節(jié)點(diǎn)　切入點(diǎn)：擬靜力試驗(yàn)　出處：《清華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：相比灌注樁,預(yù)制樁有著樁身質(zhì)量高,經(jīng)濟(jì)環(huán)保等優(yōu)點(diǎn),隨著建筑工業(yè)化進(jìn)程推進(jìn),預(yù)制樁越來越多地被推廣使用。然而,國內(nèi)預(yù)制樁抗震理論研究仍有欠缺,使其在高抗震烈度地區(qū)應(yīng)用受限,這方面研究急需補(bǔ)充。在預(yù)制樁抗震性能研究中,樁-承臺(tái)后澆節(jié)點(diǎn)尤為關(guān)鍵,國外相關(guān)研究多采用理論分析、試驗(yàn)研究以及數(shù)值仿真來評(píng)估預(yù)制樁承臺(tái)節(jié)點(diǎn)抗震性能�，F(xiàn)階段國內(nèi)建筑預(yù)制樁承臺(tái)后澆節(jié)點(diǎn)常采用樁端鋼筋錨固、樁身填芯、樁頂淺嵌固節(jié)點(diǎn)構(gòu)造形式,這一構(gòu)造設(shè)計(jì)意在通過錨固保證抗彎承載力,通過填芯提供截面抗剪及避免局部破壞并保證一定的節(jié)點(diǎn)變形能力。本文首先利用足尺擬靜力試驗(yàn),對(duì)采用這一構(gòu)造形式的離心成型高強(qiáng)混凝土空心方樁-承臺(tái)節(jié)點(diǎn)進(jìn)行抗震性能評(píng)估,對(duì)軸壓水平、加載方向、嵌固深度和樁身配筋率等參數(shù)進(jìn)行試驗(yàn)分析。試驗(yàn)節(jié)點(diǎn)最終破壞形式為2倍樁徑以下的樁身塑性鉸破壞,試驗(yàn)表明,從抗震設(shè)計(jì)角度,該構(gòu)造下空心方樁軸壓比不宜超過0.5,建議工程使用控制軸向荷載上限。本文對(duì)采用相同構(gòu)造方式的復(fù)合配筋管樁承臺(tái)節(jié)點(diǎn)進(jìn)行擬靜力試驗(yàn)研究,研究了軸壓變化、填芯構(gòu)造、復(fù)合配筋等參數(shù)對(duì)承壓節(jié)點(diǎn)性能影響,同時(shí)評(píng)估了抗拔構(gòu)造節(jié)點(diǎn)性能,另外還設(shè)計(jì)了一類簡化的半剛性節(jié)點(diǎn)構(gòu)造形式,并對(duì)其進(jìn)行節(jié)點(diǎn)抗震性能評(píng)估。試驗(yàn)結(jié)果表明,該節(jié)點(diǎn)主要破壞形式為樁頭嵌固深度內(nèi)承臺(tái)保護(hù)層破壞,嵌固失效后承載力由填芯和錨固提供。這一模式下,承壓節(jié)點(diǎn)表現(xiàn)出了較好的承載力和變形性能,但抗拔節(jié)點(diǎn)則表現(xiàn)出了承載力的突然下降和節(jié)點(diǎn)脆性破壞。建議工程使用保證一定軸壓,并對(duì)承臺(tái)保護(hù)層進(jìn)行配筋加強(qiáng)。結(jié)合空心方樁試驗(yàn),說明樁身和承臺(tái)性能差異是節(jié)點(diǎn)最終破壞模式的決定性因素,同時(shí)軸壓也是重要因素,大軸壓下樁身承擔(dān)更多損傷。試驗(yàn)結(jié)果同時(shí)還說明,本研究設(shè)計(jì)的半剛性節(jié)點(diǎn)構(gòu)造在標(biāo)準(zhǔn)軸壓水平下表現(xiàn)出較好的抗震性能,延性較好,耗能指標(biāo)優(yōu)異。本文最后利用Abaqus對(duì)空心方樁嵌固節(jié)點(diǎn)進(jìn)行數(shù)值建模,采用預(yù)應(yīng)力場(chǎng)還原了預(yù)制樁后澆節(jié)點(diǎn)的施工工藝,利用非線性彈簧模擬錨固鋼筋的粘結(jié)滑移。通過和試驗(yàn)數(shù)據(jù)的比對(duì),論證了模型單調(diào)加載結(jié)果的可靠性,并且指出了模型不適合往復(fù)加載的原因。結(jié)合數(shù)值模型單調(diào)加載,本文探討了軸壓、填芯和樁身配筋的影響,其中,軸壓對(duì)節(jié)點(diǎn)最終破壞模式影響最大,單調(diào)加載下填芯摩擦系數(shù)對(duì)性能無顯著影響,樁身塑性鉸破壞模式下增加配箍能有效改善節(jié)點(diǎn)力學(xué)性能。
[Abstract]:Compared with cast-in-place piles, prefabricated piles have the advantages of high quality, economic and environmental protection, etc. With the development of construction industrialization, prefabricated piles are more and more widely used. However, the theoretical research on earthquake resistance of prefabricated piles in China is still deficient. It is very important to study the seismic behavior of prefabricated piles, especially in post-cast-in-place joints of pile-cap. Experimental research and numerical simulation are used to evaluate the seismic behavior of prefabricated pile cap joints. At present, the post-cast-in-place joints of prefabricated pile caps are usually constructed in the form of reinforcement anchoring at the end of piles, core filling of piles and shallow embedded joints at the top of piles. The purpose of this structural design is to ensure flexural bearing capacity by anchoring, to provide shear resistance of cross-section through core filling, to avoid local damage and to guarantee certain deformation capacity of joints. In this paper, first of all, full-scale quasi-static test is used. The seismic behavior of hollow square pile-cap joints with centrifugally formed high strength concrete with this structure is evaluated, and the axial compression level and loading direction are evaluated. The test results show that the ultimate failure of the test joint is the plastic hinge failure of the pile body under 2 times the diameter of the pile. The test results show that, from the point of view of seismic design, Under this structure, the axial compression ratio of hollow square pile should not exceed 0.5. It is suggested that the upper limit of axial load should be controlled in engineering. In this paper, the pseudostatic test of composite reinforced pipe pile cap joints with the same structure is carried out, and the variation of axial pressure and the core-filling structure are studied. The effects of composite reinforcement and other parameters on the performance of bearing joints are also evaluated. In addition, a simplified structure of semi-rigid joints is designed, and the seismic behavior of joints is evaluated. The main failure form of the joint is the failure of the protective layer of the pile cap in the depth of the embedded pile head, and the bearing capacity after the embedded failure is provided by the core filling and the anchoring. In this mode, the bearing capacity and deformation performance of the bearing joint are better. However, the anti-jointing point shows a sudden drop in bearing capacity and brittle failure of the joints. It is suggested that certain axial compression should be guaranteed in the engineering, and reinforcement of the protective layer of the cap should be strengthened, and combined with the test of hollow square pile, It shows that the difference between pile body and pile cap performance is the decisive factor of the ultimate failure mode of the joint, and axial compression is also an important factor, and the pile body bears more damage under large axial compression. The test results also show that, The semi-rigid joint structure designed in this paper shows good seismic performance, good ductility and excellent energy consumption index at the standard axial compression level. Finally, numerical modeling of hollow square pile embedded joints is carried out by using Abaqus. The prestress field is used to reduce the construction technology of prefabricated post-pouring joint, and the bond-slip of anchor bar is simulated by nonlinear spring. The reliability of the monotonic loading result of the model is proved by comparing with the test data. The reason why the model is not suitable for reciprocating loading is pointed out. Combined with the monotonic loading of numerical model, the effects of axial compression, core filling and pile body reinforcement are discussed in this paper, in which axial compression has the greatest influence on the ultimate failure mode of joints. The friction coefficient of the core under monotonic loading has no significant effect on the performance, and the mechanical properties of the joints can be effectively improved by increasing the hoop under the failure mode of plastic hinge of the pile body.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU473.1

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