Thesis outline can be divided into simple outline and detailed outline. A simple outline is highly generalized, which only shows the main points of the paper, and how to develop it is not involved. Although this outline is simple, it can be written fluently because of its thoughtfulness. The following is a model essay on the outline of civil engineering papers that I share with you. Please pay attention to the graduation thesis website for more details.
Thesis title: Research on deflection calculation and control of cast-in-place concrete hollow slab.
Cast-in-place concrete hollow slab is a new floor system, which has the advantages of large span, large space and light weight, and has been widely used in practical projects in China. However, the research on cast-in-place concrete hollow slab is not perfect at present. With the further increase of the span of hollow slab, many problems including applicability need to be solved urgently. In this paper, firstly, the bending stiffness of hollow slab in two directions is calculated and analyzed, and the calculation formulas of bending stiffness of hollow slab in two directions considering the influence of transverse ribs are derived to determine the ownership of orthogonal anisotropy and isotropy. In this paper, the hollow plate is transformed into a solid plate according to the principle of equal stiffness, and its internal force is analyzed according to the bending theory of elastic thin plate. Secondly, according to Ritz method, the deflection formula of hollow slab in elastic stage is deduced. Considering that the stiffness of hollow slab decreases with the development of cracks, based on the elastic deflection formula, the deflection formulas of hollow slab in elastic-plastic stage are derived, including the deflection formulas of orthotropic slab and isotropic slab under uniformly distributed load and linear load respectively. In this paper, prestress is introduced to control the deflection of cast-in-place concrete hollow slab. It is considered that prestress acts on the bottom of the slab in the form of linear load, which causes the hollow slab to arch back. The anti-arch effect of prestress reduces the deflection of hollow slab under load; This paper also gives a quantitative calculation method of prestress. In this paper, the deflection of prestressed hollow slab with concealed beam under load is analyzed by using finite element software ANSYS. In the analysis, two models of ordinary hollow slab and prestressed hollow slab in hidden beam are established respectively for analysis. Finally, a hollow slab model test with a scale of 1: 8 is carried out, and the deflection test results of hollow slab, ANSYS calculation results and formula calculation results are compared and analyzed.
Abstract 4-5
Abstract 5-9
Chapter 1 Introduction 9- 17
1. 1 Introduction 9- 1 1
1.2 development and research of cast-in-place concrete hollow slab 1 1- 14
1.2. 1 the emergence and development of cast-in-place hollow slab 1 1- 13
1.2.2 design theory of cast-in-place hollow slab 13- 14
1.3 research status of deflection of cast-in-place concrete hollow slab 14- 15
1.4 The main research work of this paper is 15- 17.
Chapter II Elastic Theoretical Analysis of Cast-in-place Concrete Hollow Slabs 17-33
2. 1 overview 17- 18
2.2 internal force analysis of elastic thin plate 18-22
2.3 Bidirectional stiffness of concrete hollow slab 22-28
2.4 Ritz Method for Solving Thin Plate Bending Problem 28-32
2.4. 1 plate boundary conditions 28-30
2.4.2 Solving 30-32 by Ritz Method
2.5 Overview of this chapter 32-33
Chapter III Deflection Calculation of Cast-in-place Concrete Hollow Slab 33-49
3. 1 Overview 33-34
3.2 Analysis method of national laws and regulations 34-35
3.3 Elastic deflection of cast-in-place concrete hollow slab 35-42
3.3. 1 Elastic deflection of orthotropic hollow slab 36-39
3.3.2 Elastic deflection of isotropic hollow slab 39-42
3.4 Cast-in-place concrete hollow slab deflection in elastic-plastic stage 42-48
3.4. 1 About the deformation modulus of concrete 42-43
3.4.2 Moment of inertia of section after concrete cracking 43-44
3.4.3 Stiffness of cast-in-place concrete hollow slab in elastic-plastic stage 44-46
3.4.4 Deflection calculation of cast-in-place concrete hollow slab in elastic-plastic stage 46-48
3.5 Overview of this chapter 48-49
The fourth chapter is the research on deflection control of cast-in-place concrete hollow slab 49-62.
4. 1 Introduction 49
4.2 Introduction of prestress 49-53
Prestress degree 50+0
4.2.2 prestress loss 50-5 1
4.2.3 Equivalent load of prestress and inverted arch 5 1-53
4.3 Load Conversion 53-56
4.3. 1 load conversion method 53-54
4.3.2 Conversion of surface load into short-term linear load 54-56
4.3.3 Surface load is converted into long-term load 56
4.4 Deflection Control 56-59
Determine the target deflection value 57
4.4.2 Determine the prestress.
?
?
;