【摘要】：現(xiàn)澆鋼筋混凝土空心樓蓋作為一種新型樓蓋形式,在使用功能、結構性能、經(jīng)濟性能等方面融合了諸多優(yōu)勢,成為我國建筑結構領域的一項重大技術創(chuàng)新。目前很多學者對它的極限狀態(tài)性能進行了大量的理論和實驗研究,但由于理論分析和實驗研究方法的不同,研究結果在工程應用中具有很大的局限性。因此從工程應用角度出發(fā),給出一種簡便實用的設計計算方法是人們關心的首要問題。本文采用彈性理論方法,對四邊簡支的現(xiàn)澆混凝土空心樓蓋進行內(nèi)力和變形分析,得到內(nèi)力和撓度計算公式。并對邊梁扭轉問題和人行荷載下的舒適度問題進行理論分析和數(shù)值模擬,主要內(nèi)容如下:1、數(shù)值分析表明,空心樓蓋的應力分布和裂縫開展都有一定的規(guī)律可循,這與實心板極為相似,并且出現(xiàn)類似實心板的塑性鉸線,但是空心樓蓋的自重小、剛度大、變形小使之優(yōu)于實心板。2、基于彈性薄板小撓度理論,根據(jù)空心樓蓋的構造特點,考慮彎曲剛度和扭曲剛度增大系數(shù),給出了四邊簡支樓蓋內(nèi)力和變形計算公式,算例表明公式所得計算值與ANSYS數(shù)值模擬結果差距不大。3、在考慮了次梁的彎曲扭轉、平面外彎矩引起的框架節(jié)點的轉動和邊梁自身的相對扭轉三種影響因素后,給出了邊梁扭矩計算公式,算例表明公式所得計算值與ANSYS數(shù)值模擬結果差距不大。4、本文采用三種方法模擬人行荷載,從傅里葉定點加載的模擬結果看出,對樓蓋中心點連續(xù)的脈沖荷載將對舒適度非常不利。單步落足加載方法和考慮頻率變化時的加載方法結果很相近,但是考慮頻率變化時更貼近現(xiàn)實情況。同時對多人行走的舒適度進行數(shù)值模擬,與規(guī)范的限定值對比,表明空心樓蓋有較好的舒適度。
[Abstract]:As a new type of floor, cast-in-place reinforced concrete hollow floor has many advantages in using function, structural performance and economic performance, which has become a major technical innovation in the field of building structure in China. At present, many scholars have done a lot of theoretical and experimental research on its limit state performance. However, due to the difference between theoretical analysis and experimental research methods, the research results have great limitations in engineering applications. Therefore, from the point of view of engineering application, a simple and practical design and calculation method is the primary concern of people. In this paper, the internal force and deformation of cast-in-place concrete hollow floor with simply supported four sides are analyzed by means of elastic theory, and the formulas of internal force and deflection are obtained. Theoretical analysis and numerical simulation of the torsion problem of side beam and comfort degree under pedestrian load are carried out. The main contents are as follows: 1. The numerical analysis shows that the stress distribution and crack development of hollow floor have certain laws to follow. This is very similar to the solid plate, and there are plastic hinges similar to the solid slab, but the hollow floor is better than the solid slab because of its small weight, large stiffness and small deformation. Based on the theory of small deflection of elastic thin plate, and according to the structural characteristics of the hollow floor, Considering the increasing coefficient of bending stiffness and torsional stiffness, the calculation formula of internal force and deformation of four-side simply supported floor slab is given. The calculation results show that the calculated value is not much different from the result of ANSYS numerical simulation, and the bending torsion of secondary beam is considered. After three factors affecting the rotation of frame joints caused by out-of-plane bending moment and the relative torsion of the side beam itself, the calculation formula of the torsional moment of the edge beam is given. The numerical examples show that there is not much difference between the calculated value of the formula and the result of ANSYS numerical simulation. In this paper, three methods are used to simulate the pedestrian load, and it can be seen from the simulation results of Fourier fixed-point loading. The continuous pulse load at the center of the floor will be unfavorable to the comfort. The results of the single step loading method are similar to those of the loading method considering the frequency change, but the results are closer to the actual situation when the frequency change is considered. At the same time, the comfort degree of many people walking is simulated, and compared with the limited value of the code, it shows that the hollow floor has better comfort.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU375

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本文編號：2128056